Publications by authors named "Lihui Chen"

77 Publications

An oriented Fe-regulated lignin-based hydrogel with desired softness, conductivity, stretchability, and asymmetric adhesiveness towards anti-interference pressure sensors.

Int J Biol Macromol 2021 Jun 4. Epub 2021 Jun 4.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province 350002, People's Republic of China; Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address:

The development of conductive, soft, ultra-stretchable, and asymmetrically adhesive hydrogels is difficult and essential for both wearable electronics and anti-adhesion tissue dressings. In particular, there is still no simple, effective and universal approach to construct an asymmetrically adhesive multifunctional hydrogel. Here, we first synthesized lignosulfonate sodium (LS)-doped PAA hydrogels with uniform adhesion (adhesive strength: ~30.5 kPa), conductivity (~0.45 S/m), stretchability (up to ~2250%), and low compressive modulus (~20 kPa). In the second step, an oriented soaking of Fe onto the upper surface of the resultant composite hydrogel renders the upper surface non-adhesive. This novel strategy masterfully delivers asymmetric adhesion behavior to the upper and bottom surfaces of the same hydrogel (~0 kPa adhesive strength for the upper surface; strong adhesive strength of ~27 kPa for the bottom surface). The asymmetric adhesive hydrogel has proven to adhere well onto the human skin and achieve waste-barrier. Importantly, this hydrogel assembled pressure sensor demonstrates excellent anti-interference and wearable comfort.
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http://dx.doi.org/10.1016/j.ijbiomac.2021.05.203DOI Listing
June 2021

Nanocellulose-derived carbon/g-CN heterojunction with a hybrid electron transfer pathway for highly photocatalytic hydrogen peroxide production.

J Colloid Interface Sci 2021 Oct 24;599:507-518. Epub 2021 Apr 24.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China.

Using oxygen reduction for the photocatalytic production of hydrogen peroxide (HO) has been considered a green and sustainable route. In the present study, to achieve high efficiency, graphitic carbon nitride (g-CN) was obtained using thermal polymerization from a bi-component precursor and was then assembled with cellulose nanofibers. It was found that a small quantity of cellulose nanofibers that generates carbon fibers upon pyrolysis greatly improves the photocatalytic activity compared with that of g-CN alone. The well-defined carbon/g-CN heterojunction-type material exhibits as high as 1.10 mmol Lh of photo-production of HO under visible light, which is 4.2 times higher than that yielded by pristine g-CN from a single precursor. A comprehensive characterization of the photocatalyst enables us to delineate the effect of the carbon nanofiber with respect to porosity, electron-hole separation, band gap regulation, and especially the electron transfer pathway. Our results demonstrate that nanocellulose-derived carbon, when precisely assembled with other functional material such as a photocatalyst, is a promising promoter of their activity.
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http://dx.doi.org/10.1016/j.jcis.2021.04.111DOI Listing
October 2021

Nature-inspired self-powered cellulose nanofibrils hydrogels with high sensitivity and mechanical adaptability.

Carbohydr Polym 2021 Jul 26;264:117995. Epub 2021 Mar 26.

College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province 350002, China; Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B5A3, Canada.

It is still a challenge to integrate high sensitivity, mechanical adaptability, and self-powered properties for hydrogels. Herein, we report a conductive polyvinyl alcohol (PVA) hydrogel based on natural nanoclay and cellulose nanofibrils (CNFs). The CNFs and PVA chains could construct a double network structure, resulting in a high mechanical composite hydrogel. Meanwhile, the nanoclay could be well dispersed and immobilized in the network of the hydrogel, thus improving mechanical adaptability of the hydrogel for curved and dynamic surfaces. Moreover, the conductive ions (Al) imparted the hydrogel with high conductivity (6.67 S m) and gauge factor (1.17). Therefore, the composite hydrogel exhibited high sensitivity to tiny pressure changes, enabling recognition of the complicated sounding and handwriting. More importantly, the composite hydrogel possessed self-powered property, which could generate an output voltage of up to 78 mV. In summary, the multi-functional composite hydrogel may have giant applications in artificial electronic skins or wearable devices.
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http://dx.doi.org/10.1016/j.carbpol.2021.117995DOI Listing
July 2021

Mild depolymerization of the sinocalamus oldhami alkali lignin to phenolic monomer with base and activated carbon supported nickel-tungsten carbide catalyst composite system.

Bioresour Technol 2021 Aug 6;333:125136. Epub 2021 Apr 6.

Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Resources, Fuzhou University, Fuzhou 350116, Fujian, China; Fujian Provincial Technology Exploitation Base of Biomass Resources, Fuzhou University, Fuzhou 350116, China. Electronic address:

In this study, the sinocalamus oldhami alkali lignin was depolymerized into phenolic products in a combined system by using the composite alkali and Ni-WC/activated carbon (AC) as catalysts. FT-IR, GPC, TG, 2D-HSQC and GC-MS were used to analyze the composition, structure and distribution of degradation products, and the synergistic effect of metal and alkali catalysts on the depolymerization of lignin was also studied. The results showed that Ni-WC/AC and composite alkali could effectively improve the catalytic degradation efficiency of lignin under mild conditions, 94.4% of lignin was converted and 17.18% of phenolic monomers were obtained under 260 °C for 5 h. In this composite system, the synergism of the basic sites, the metal active sites and the Lewis acid sites could promote the cleavage of C-O bonds in the lignin molecule and lower the char formation during the base-catalyzed solvolysis. Phenolic monomers were mainly composed of phenol, 2-methyl-phenol and p-cresol etc.
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http://dx.doi.org/10.1016/j.biortech.2021.125136DOI Listing
August 2021

Transparent, smooth, and sustainable cellulose-derived conductive film applied for the flexible electronic device.

Carbohydr Polym 2021 May 16;260:117820. Epub 2021 Feb 16.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China; National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, PR China. Electronic address:

A high-performance flexible conductive substrate is one of the key components for developing promising wearable devices. Concerning this, a sustainable, flexible, transparent, and conductive cellulose/ZnO/AZO (CZA) film was developed in this study. The cellulose was used as the transparent substrate. The added AZO was as the conductive layer and ZnO functioned as an interface buffer layer. Results showed that the interface buffer layer of ZnO effectively alleviated the intrinsic incompatibility of organic cellulose and inorganic AZO, resulting in the improvement of the performance of CZA film. In compared with the controlled cellulose/AZO (CA) film with 365 Ω/sq sheet resistance and 87% transmittance, this CZA film featured a low conductive sheet resistance of 115 Ω/sq and high transmittance of 89%, as well as low roughness of 1.85 nm Moreover, the existence of conducive ZnO buffer layer enabled the conductivity of CZA film to be stable under the bending treatment. Herein, a flexible electronic device was successfully prepared with the biomass materials, which would be available by a roll-to-roll production process.
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http://dx.doi.org/10.1016/j.carbpol.2021.117820DOI Listing
May 2021

Metal Cation Valency Dependence in Morphology Evolution of Cu S Nanodisk Seeds and Their Pseudomorphic Cation Exchanges.

Chemistry 2021 May 16;27(26):7444-7452. Epub 2021 Mar 16.

College of Chemical Engineering, Zhejiang University of Technology, 18, Chaowang Road, Hangzhou, 310014, P. R. China.

A crucial parameter in the design of semiconductor nanoparticles (NPs) with controllable optical, magnetic, electronic, and catalytic properties is the morphology. Herein, we demonstrate the potential of additive metal cations with variable valency to direct the morphology evolution of copper-deficient Cu S nanoparticles in the process of seed-mediated growth. In particular, the djurleite Cu S seed could evolve from disk into tetradecahedron in the presence of tin(IV) cations, whereas they merely formed sharp hexagonal nanodisks with tin(II) cations. In addition to djurleite Cu S, the tin(IV) cations could be generalized to direct the growth of roxbyite Cu S and covellite CuS nanodisk seeds into tetradecahedra. We further perform pseudomorphic cation exchanges of Cu S tetradecahedra with Zn and Cd to produce polyhedral zinc sulfide (ZnS) and cadmium sulfide (CdS) NPs. Moreover, we achieve Cu S/ZnS and Cu S/CdS tetradecahedral heterostructures via partial cation exchange, which are otherwise inaccessible by traditional synthetic approaches.
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http://dx.doi.org/10.1002/chem.202100006DOI Listing
May 2021

Ultra-low pressure cellulose-based nanofiltration membrane fabricated on layer-by-layer assembly for efficient sodium chloride removal.

Carbohydr Polym 2021 Mar 5;255:117352. Epub 2020 Nov 5.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350002, China. Electronic address:

Cellulose is a renewable, biodegradable, biocompatible, and sustainable material. A bamboo cellulose-based nanofiltration membrane (LBL-NF-CS/BCM) was prepared with a combination of layer-by-layer assembly and spraying methods. The chemical structure, morphology, and surface charge of the resultant LBL-NF-CS/BCM composite membranes were characterized based on Thermo Gravimetric Analysis (TGA), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and X-ray Photoelectron Spectroscopy Scanning (XPS). The nanofiltration performance of the LBL-NF-CS/BCM composite membranes was evaluated using 500 ppm NaCl solutions under 0.3 MPa pressure. It was found that the LBL-NF-CS/BCM composite membranes had a rejection rate of about 36.11 % against a 500 ppm NaCl solution under the conditions tested, and membrane flux of about 12.08 L/(m h) was reached. The combined layer-by-layer assembly and spraying provides a scalable and convenient process concept for nanofiltration membrane fabrication.
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http://dx.doi.org/10.1016/j.carbpol.2020.117352DOI Listing
March 2021

Mussel-inspired biocompatible polydopamine/carboxymethyl cellulose/polyacrylic acid adhesive hydrogels with UV-shielding capacity.

Cellulose (Lond) 2021 Jan 2:1-14. Epub 2021 Jan 2.

College of Material Engineering, Fujian Agriculture and Forestry University, No. 63, Xiyuangong Road, Minhou District, Fuzhou, 350108 Fujian People's Republic of China.

Hydrogels are attractive due to their various applications in the fields of biomedical materials, cosmetics, and biosensors. To enhance UV protection and prevent skin penetration behaviors, inspired by the mussel adhesive proteins, the functional polydopamine (PDA) is employed herein to fabricate polydopamine/carboxymethyl cellulose/polyacrylic acid (PDA/CMC/PAA) adhesive hydrogels. To disperse PDA nanoparticles well in the PAA matrix, dopamine was self-polymerized in CMC solution to form PDA/CMC complex. Acrylic acid was polymerized in PDA/CMC complex solution and cross-linked to construct UV-resistant PDA/CMC/PAA hydrogel. The morphology, rheological behavior, mechanical properties and adhesion strength of PDA/CMC/PAA hydrogels were studied by scanning electron microscopy, rotational rheometer, universal test machine. Owing to the hydrogen bonding interaction between the PDA/CMC complex and PAA, the PDA/CMC/PAA hydrogels showed high resilience and compressive strength to withstand large deformation. The hydrogels exhibited strong adhesion to various substrate surfaces, such as stainless steel, aluminum, glass and porcine skin. The biocompatibility and UV-shielding properties were investigated through culture of cells and UV irradiation test. The adhesiveness of PDA promoted cell adhesion and provided the PDA/CMC/PAA hydrogels good biocompatibility with 96% of relative cell viability. The hydrogels possessed excellent UV-shielding ability to prevent collagen fibers from being destroyed during UV irradiation, which has promising potential in the practical applications for UV filtration membrane and skin care products.
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http://dx.doi.org/10.1007/s10570-020-03596-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7778394PMC
January 2021

Skin and Gut Microbiome in Psoriasis: Gaining Insight Into the Pathophysiology of It and Finding Novel Therapeutic Strategies.

Front Microbiol 2020 15;11:589726. Epub 2020 Dec 15.

Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China.

Psoriasis affects the health of myriad populations around the world. The pathogenesis is multifactorial, and the exact driving factor remains unclear. This condition arises from the interaction between hyperproliferative keratinocytes and infiltrating immune cells, with poor prognosis and high recurrence. Better clinical treatments remain to be explored. There is much evidence that alterations in the skin and intestinal microbiome play an important role in the pathogenesis of psoriasis, and restoration of the microbiome is a promising preventive and therapeutic strategy for psoriasis. Herein, we have reviewed recent studies on the psoriasis-related microbiome in an attempt to confidently identify the "core" microbiome of psoriasis patients, understand the role of microbiome in the pathogenesis of psoriasis, and explore new therapeutic strategies for psoriasis through microbial intervention.
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http://dx.doi.org/10.3389/fmicb.2020.589726DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7769758PMC
December 2020

Rapid elimination of trace bisphenol pollutants with porous β-cyclodextrin modified cellulose nanofibrous membrane in water: adsorption behavior and mechanism.

J Hazard Mater 2021 02 14;403:123666. Epub 2020 Aug 14.

Key Laboratory of National Forestry & Grassland Bureau for Plant Fiber Functional Materials, College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China. Electronic address:

A porous β-cyclodextrin modified cellulose nano-fiber membrane (CA-P-CDP) was fabricated and employed to treat the trace bisphenol pollutants (bisphenol A (BPA), bisphenol S (BPS), and bisphenol F (BPF)) in water. The characterization highlighted the porous structure, stable crystal structure, good thermal stability of the obtained CA-P-CDP, as well as abundant functional groups, which could greatly improve the adsorption of bisphenol pollutants and recovery. During the static adsorption process, the adsorbents dosage, temperature and pH showed significant influence on the adsorption performance. At the selected conditions (25 °C, 7.0 of pH and 0.1 g L of CA-P-CDP dosage), the BPA/BPS/BPF adsorption on CA-P-CDP could rapidly reached the equilibrium in 15 min by following the pseudo-second-order kinetic model, and the maximum adsorption capacities were 50.37, 48.52 and 47.25 mg g, respectively, according to Liu isotherm model. The mechanisms between the bisphenol pollutants and CA-P-CDP mainly involved the synergism of hydrophobic effects, hydrogen-bonding interactions and π-π stacking interactions. Besides, the dynamic adsorption data showed that the volume of treated water for CA-P-CDP (0.58 L) was 14.5 times larger than that of pristine cellulose membrane (0.04 L), revealing satisfactory adsorption performance of trace BPA in water. Furthermore, during the treatment of real water samples (lake water and river water) with trace bisphenol pollutants, the complete removal of the pollutants were evidently observed, which strongly verified the possibility of CA-P-CDP for the practical application.
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http://dx.doi.org/10.1016/j.jhazmat.2020.123666DOI Listing
February 2021

Sulfur Precursor Reactivity Affecting the Crystal Phase and Morphology of Cu S Nanoparticles.

Chemistry 2021 Jan 4;27(3):1057-1065. Epub 2020 Dec 4.

College of Chemical Engineering, Zhejiang University of Technology, 18, Chaowang Road, Hangzhou, 310014, P.R. China.

For plasmonic copper-deficient Cu S nanoparticles (NPs), accurate control of the crystal phase and morphology is highly desirable as both of which are known to determine the localized surface plasmon resonance (LSPR) wavelength and amplitude. Here, how the sulfur precursor reactivity in the synthesis of Cu S NPs affects the resulting crystal phase and morphology is examined. Djurleite Cu S, roxbyite Cu S, digenite Cu S as well as covellite CuS nanodisks were synthesized by using 1-dodecanethiol, N,N-dibutylthiourea, and crystal sulfur 1-octadecene/oleylamine solutions and their crystal phase dependent LSPR properties were exhaustively discussed. In addition, crystal phase interconversion between covellite CuS and djurleite/roxbyite Cu S was realized in the presence of the above sulfur precursors. On the other hand, djurleite Cu S nanorods rather than nanodisks were prepared by replacing 1-dodecanethiol with more reactive tert-dodecanethiol. The structural and morphological Cu S NPs here holds great promise in the application of photothermal therapy, photocatalysis, surface-enhanced Raman scattering (SERS), and many others.
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http://dx.doi.org/10.1002/chem.202003760DOI Listing
January 2021

Conductive Regenerated Cellulose Film and Its Electronic Devices - A Review.

Carbohydr Polym 2020 Dec 20;250:116969. Epub 2020 Aug 20.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China; National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, PR China. Electronic address:

Natural cellulose features the outstanding merits of biodegradability, large-volume production and worldwide availability, which has become a promising material for achieving a sustainable society. Based on a simple dissolution-regeneration process of natural cellulose, the flexible, transparent, and smooth regenerated cellulose film (RCF) can be easily manufactured. The RCF can become conductive by introducing the conductive materials, which has presented potential applications for high-performance electronic devices. Herein, we summarized the mainly non-derivative solvents for the preparation of the RCF as well as the conductive materials for manufacturing the conducive regenerated cellulose film (CRCF). In addition, the CRCF-based versatile electronic device were also introduced.
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http://dx.doi.org/10.1016/j.carbpol.2020.116969DOI Listing
December 2020

Urate in fingernail represents the deposition of urate burden in gout patients.

Sci Rep 2020 09 23;10(1):15575. Epub 2020 Sep 23.

Key Laboratory of Natural Medicines of the Changbai Mountain, Ministry of Education, Pharmaceutical Analysis, College of Pharmacy, Yanbian University, Yanji, 133002, Jilin Province, China.

Urate in the fingernails of gout patients and healthy volunteers was successfully detected by high-performance liquid chromatography (HPLC) with ultraviolet (UV) in our previous research. This study aimed to further investigate whether nail urate could be a proxy for the burden of monosodium urate (MSU) crystals deposits in gout. To this end, we conducted a study in two parts. Firstly, we successfully detected urate in the nail by HPLC-UV and evaluated nail urate concentrations in control subjects and patients with gout. As expected, we found that levels of nail urate were significantly higher in patients with gout than in healthy controls, and the nail urate level was significantly correlated with the volume of MSU crystals deposits measured by dual-energy CT (DECT). Secondly, we found that nail urate can reflect changes in urate levels in the body during urate lowering therapy through a 3-month follow-up study. Our results provide the possibility of quantification of urate in human fingernails as a non-invasive alternative for assessing MSU crystals deposits in gout.
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http://dx.doi.org/10.1038/s41598-020-72505-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7511301PMC
September 2020

A trusted medical image super-resolution method based on feedback adaptive weighted dense network.

Artif Intell Med 2020 06 16;106:101857. Epub 2020 May 16.

College of Electrical Engineering, Sichuan University, Chengdu, Sichuan 610065, China.

High-resolution (HR) medical images are preferred in clinical diagnoses and subsequent analysis. However, the acquisition of HR medical images is easily affected by hardware devices. As an effective and trusted alternative method, the super-resolution (SR) technology is introduced to improve the image resolution. Compared with traditional SR methods, the deep learning-based SR methods can obtain more clear and trusted HR images. In this paper, we propose a trusted deep convolutional neural network-based SR method named feedback adaptive weighted dense network (FAWDN) for HR medical image reconstruction. Specifically, the proposed FAWDN can transmit the information of the output image to the low-level features by a feedback connection. To explore advanced feature representation and reduce the feature redundancy in dense blocks, an adaptive weighted dense block (AWDB) is introduced to adaptively select the informative features. Experimental results demonstrate that our FAWDN outperforms the state-of-the-art image SR methods and can obtain more clear and trusted medical images than comparative methods.
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http://dx.doi.org/10.1016/j.artmed.2020.101857DOI Listing
June 2020

A covalently linked dual network structure achieved by rapid grafting of poly(p-phenylenediamine)-phosphomolybdic acid on reduced graphene oxide aerogel for improving the performance of supercapacitors.

Chem Commun (Camb) 2020 Jul 1;56(53):7305-7308. Epub 2020 Jun 1.

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P. R. China.

Covalent grafting of poly(p-phenylenediamine) (PPD)-phosphomolybdic acid (PMo) on rGO ([email protected]) has been realized within 1 minute. [email protected] shows a characteristic covalently linked dual network structure that can significantly enhance its specific capacitance and cycling stability for supercapacitor applications.
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http://dx.doi.org/10.1039/d0cc02464cDOI Listing
July 2020

Annexin A2 gene interacting with viral matrix protein to promote bovine ephemeral fever virus release.

J Vet Sci 2020 Mar;21(2):e33

Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, Jinan 250014, China.

Bovine ephemeral fever virus (BEFV) causes bovine ephemeral fever, which can produce considerable economic damage to the cattle industry. However, there is limited experimental evidence regarding the underlying mechanisms of BEFV. Annexin A2 (AnxA2) is a calcium and lipid-conjugated protein that binds phospholipids and the cytoskeleton in a Ca-dependent manner, and it participates in various cellular functions, including vesicular trafficking, organization of membrane domains, and virus proliferation. The role of the AnxA2 gene during virus infection has not yet been reported. In this study, we observed that AnxA2 gene expression was up-regulated in BHK-21 cells infected with the virus. Additionally, overexpression of the AnxA2 gene promoted the release of mature virus particles, whereas BEFV replication was remarkably inhibited after reducing AnxA2 gene expression by using the small interfering RNA (siRNA). For viral proteins, overexpression of the Matrix (M) gene promotes the release of mature virus particles. Moreover, the AnxA2 protein interaction with the M protein of BEFV was confirmed by GST pull-down and co-immunoprecipitation assays. Experimental results indicate that the C-terminal domain (268-334 aa) of AxnA2 contributes to this interaction. An additional mechanistic study showed that AnxA2 protein interacts with M protein and mediates the localization of the M protein at the plasma membrane. Furthermore, the absence of the AnxA2-V domain could attenuate the effect of AnxA2 on BEFV replication. These findings can contribute to elucidating the regulation of BEFV replication and may have implications for antiviral strategy development.
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http://dx.doi.org/10.4142/jvs.2020.21.e33DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7113574PMC
March 2020

Novel Modification of Collagen: Realizing Desired Water Solubility and Thermostability in a Conflict-Free Way.

ACS Omega 2020 Mar 11;5(11):5772-5780. Epub 2020 Mar 11.

College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China.

Because of poor water solubility and low thermostability, the application of collagen is limited seriously in fields such as injectable biomaterials and cosmetics. In order to overcome the two drawbacks simultaneously, a novel bifunctional modifier based on the esterification of polyacrylic acid (PAA) with -hydroxysuccinimide (NHS) was prepared. The esterification degree of PAA-NHS esters was increased upon increasing the NHS dose, which was confirmed by Fourier-transform infrared (FTIR) and nuclear magnetic resonance spectrascopy. FTIR results indicated that the triple helix of the modified collagens remained integrated, whereas the molecular weight became larger, as reflected by the sodium dodecyl sulfate-polyacrylamide gel electrophoresis pattern. The modified collagens displayed excellent water solubility under neutral condition, owing to lower isoelectric point (3.1-4.3) than that of native collagen (7.1). Meanwhile, denaturation temperatures of the modified collagens were increased by 4.8-5.9 °C after modification. The modified collagen displayed hierarchical microstructures, as reflected by field-emission scanning electron microscopy, while atomic force microscopy further revealed a "fishing net-like" network in the nanoscale, reflecting a unique aggregation behavior of collagen macromolecules after modification. As a whole, the PAA-NHS ester as a bifunctional modifier endowed collagen with desired water solubility and thermostability in a conflict-free manner, which was beneficial to the process and application of the water-soluble collagen.
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http://dx.doi.org/10.1021/acsomega.9b03846DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7097890PMC
March 2020

C-nanocoated ZnO by TEMPO-oxidized cellulose templating for improved photocatalytic performance.

Carbohydr Polym 2020 May 8;235:115958. Epub 2020 Feb 8.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350108, China. Electronic address:

Ultrafine C-doped ZnO/carbon nanocomposites with different photocatalytic activities have been prepared using TEMPO-oxidized cellulose as a template but also as the source of carbon. The result is an enhancement of the photocatalytic activity ascribed to different phenomena: a high mesoporosity beneficial to mass transport, a thin carbon layer onto ZnO increasing the charge transfer and hydrophobicity of ZnO, a narrowing of ZnO band gap and an increase of the zinc (V) and oxygen (V) vacancies effectively suppressing of the charge recombination. These are evidenced by photocatalytic test of photodegradation of methyl orange (MO) achieved to assess and compared the different photocatalysts. The highest rate constant value of photodegradation of MO is 0.0254 min, three times higher than that of ZnO prepared without templates (0.0087 min). The present results introduce a new vision of the use of template with multiple roles in the preparation of inorganic materials and specially photocatalysts.
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http://dx.doi.org/10.1016/j.carbpol.2020.115958DOI Listing
May 2020

Detecting Host-Plant Volatiles with Odorant Receptors from (Busck) (Lepidoptera: Tortricidae).

J Agric Food Chem 2020 Mar 20;68(9):2711-2717. Epub 2020 Feb 20.

State Key Laboratory of Crop Stress Biology in Arid Areas, College of Plant Protection, Northwest A&F University, Yangling 712100, China.

is a global pest of stone and pome fruits. The sensitive olfactory system plays a crucial role in regulating key behavioral activities of insects and relies heavily on general odorant receptors (ORs) to detect host-plant volatiles. In this study, three general OR genes from (, , and ) were identified. Quantitative polymerase chain reaction revealed that expression was considerably higher in adults and adult antennae than in any other life stages and body parts, respectively. Moreover, the expression of was significantly higher in the antennae of females than in those of males, with a peak in the antennae of 3-days-old adult females. GmolOR20 and GmolOR21 displayed no responses to any of the odorant compounds tested in the oocyte system. GmolOR12 was tuned mainly to 5 of the 47 odorant components tested (including decanol, heptanal, octanal, nonanal, and decanal), and the response to aldehydes among the 5 components was the highest. Additionally, they all elicited female and male antennae electroantennogram responses, and the aldehydes elicited the highest response among the 5 components. These results suggested that in the olfactory system plays an important role in sensing aldehydes and that is involved in sensing host-plant volatiles. These findings provide insight into the possibility of using host-plant volatiles for the control of .
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http://dx.doi.org/10.1021/acs.jafc.9b07305DOI Listing
March 2020

Intestinal obstruction caused by abdominal cocoon.

ANZ J Surg 2020 09 29;90(9):1818-1820. Epub 2020 Jan 29.

Gastrointestinal Cancer Center, Chongqing University Cancer Hospital, Chongqing, China.

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http://dx.doi.org/10.1111/ans.15716DOI Listing
September 2020

From Straw to Device Interface: Carboxymethyl-Cellulose-Based Modified Interlayer for Enhanced Power Conversion Efficiency of Organic Solar Cells.

Adv Sci (Weinh) 2020 Jan 27;7(2):1902269. Epub 2019 Nov 27.

College of Materials Engineering Fujian Agriculture and Forestry University Fuzhou 350000 P. R. China.

Advanced interface materials made from petrochemical resources have been extensively investigated for organic solar cells (OSCs) over the past decades. These interface materials have demonstrated excellent performances in OSC devices. However, the limited resources, high-cost, and non-ecofriendly nature of petrochemical-based interface materials restrict their commercial applications. Here, a facile and effective approach to prepare cellulose and its derivatives as a cathode interface layer for OSCs with enhanced performance from rice straw of agroforestry residues is demonstrated. By employing this carboxymethyl cellulose sodium (CMC) into OSCs, a highly efficient inverted OSC is constructed, and a power conversion efficiency (PCE) of 12.01% is realized using poly[(2,6-(4,8-bis(5-(2-ethyl-hexyl)-thiophen-2-yl)-benzo[1,2-b:4,5-b'] dithiophene))--(5,5-(1',3'-di-2-thienyl-5',7-bis(2-ethylhexyl)benzo[1',2'-c: 4',5'-c']dithiophene-4,8-dione): 3,9-bis(2-methylene-((3-(1, 1-dicyanomethylene)-6/7-methyl)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d: 2',3'-d']-s-indaceno[1,2-b: 5, 6-b']dithiophene as the active layer, which shows over 9.4% improvement in PCE compared to that of a device without the CMC layer (PCE = 10.98%), especially the enhancement in short-circuit current. The improved current densities and PCEs are attributed to the reduced work function, enhanced absorption, and improved interfacial contact by using CMC and ZnO as co-interface. This approach of fabricating interface materials from biorenewable sources for OSCs is simple, scalable, and cost-effective, representing a promising direction for the development of smart interface and green electronics.
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http://dx.doi.org/10.1002/advs.201902269DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6974931PMC
January 2020

Integrating Benzenesulfonic Acid Pretreatment and Bio-Based Lignin-Shielding Agent for Robust Enzymatic Conversion of Cellulose in Bamboo.

Polymers (Basel) 2020 Jan 10;12(1). Epub 2020 Jan 10.

College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.

A hydrotrope-based pretreatment, benzenesulfonic acid (BA) pretreatment, was used to fractionate bamboo in this work. With optimized content (80 wt %) of BA in pretreatment liquor, about 90% of lignin and hemicellulose could be removed from bamboo under mild conditions (95 °C, 30 min or 80 °C, 60 min). The potential accessibility of BA pretreated substrate to cellulase was thus significantly improved and was also found to be much higher than those of acidic ethanol and dilute acid pretreatments. But the deposition of lignin on the surface of solid substrates, especially the BA pretreated substrate, was also observed, which showed a negative effect on the enzymatic hydrolysis efficiency. The addition of inexpensive soy protein, a bio-based lignin-shielding agent, could readily overcome this negative effect, leading the increase of enzymatic conversion of cellulose in BA pretreated substrate from 37% to 92% at a low cellulase loading of 4 FPU/g glucan. As compared to acidic ethanol and dilute acid pretreatments, the combination of BA pretreatment and soy protein could not only stably improve the efficiency of non-cellulose components removal, but also could significantly reduce the loading of cellulase.
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http://dx.doi.org/10.3390/polym12010191DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7022729PMC
January 2020

Mussel-inspired cellulose-based adhesive with biocompatibility and strong mechanical strength via metal coordination.

Int J Biol Macromol 2020 Feb 16;144:127-134. Epub 2019 Dec 16.

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China. Electronic address:

Inspired by marine mussel, catechol-containing materials, such as adhesives, self-healing hydrogels, and antifouling coatings, have been developed with wide applications in chemical, biomedical, and electronics industries. Conventionally, petrochemicals or organic solvents are widely used for preparation and dissolution of adhesives, which makes the adhesives are not eco-friendly and biocompatible. To develop environmentally friendly and biocompatible adhesives with desired properties, here we report catechol-containing cellulose-based tissue adhesives, synthesized by incorporating catechol groups onto cellulose. The structures of the adhesives with different catechol contents were analyzed by UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (H NMR) spectroscopy. The adhesion strengths were examined using porcine skin by lap shear tensile tests. The adhesion strength of the as-prepared adhesive with catechol content of 16.5 mol% was 20.0 kPa. Fe was used as crosslinker to enhance the adhesion strength and accelerate the solidification of adhesives. Through the Fe-catechol coordination, the adhesion strength of adhesive was increased to 88.0 kPa, showing strong mechanical strength compared to the fibrin adhesive. NIH 3T3 cells test demonstrates that the adhesive is favorable for cell attachment and proliferation, possessing excellent biocompatibility. The catechol-containing cellulose-based adhesive has promising application in bioengineering field.
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http://dx.doi.org/10.1016/j.ijbiomac.2019.12.076DOI Listing
February 2020

[Determination of cylindrospermopsin, nodularin and microcystins in freshwater fish by dispersive solid phase extraction-liquid chromatography-tandem mass spectrometry].

Se Pu 2019 Jul;37(7):723-728

Xiamen Municipal Center for Disease Control and Prevention, Xiamen 361021, China.

A method was developed for the determination of cylindrospermopsin (CYN), nodularin (NOD), microcystin-RR (MC-RR), microcystin-YR (MC-YR) and microcystin-LR (MC-LR) in freshwater fish by dispersive solid phase extraction-liquid chromatography-tandem mass spectrometry (DSPE-LC-MS/MS). The analytes were extracted from fish tissues with acetonitrile-water-formic acid (89:10:1, v/v/v), and purified by DSPE using C as the adsorbent. The separation of analytes was performed on an Agilent ZORBAX Eclipse XDB C column with the gradient elution of acetonitrile and water as mobile phases. Qualitative analysis was performed using the multiple reaction monitoring (MRM) mode. The analytes were quantified by matrix-matched external standard curves. The chromatographic and MS parameters were optimized. Major factors affecting the extraction and cleanup efficiencies including the type of extraction solvent and cleanup sorbent were investigated. The linear correlation coefficients () of the five target compounds were no less than 0.9954. The limits of detection (LODs, =3) and limits of quantification (LOQs, =10) of the five target compounds were 5-10 μg/kg and 15-40 μg/kg, respectively. The spiked recoveries of the five target compounds ranged from 62.3% to 101.2%. The developed method is simple, rapid, accurate, sensitive, and is suitable for the determination of cylindrospermopsin, nodularin and microcystins in freshwater fish.
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http://dx.doi.org/10.3724/SP.J.1123.2019.01022DOI Listing
July 2019

Directly Grown Multiwall Carbon Nanotube and Hydrothermal MnO Composite for High-Performance Supercapacitor Electrodes.

Nanomaterials (Basel) 2019 May 6;9(5). Epub 2019 May 6.

Institute of Micro-nano Structures & Optoelectronics, Wenzhou University, Wenzhou 325035, China.

MnO-MWNT-Ni foam supercapacitor electrodes were developed based on directly grown multiwalled carbon nanotubes (MWNTs) and hydrothermal MnO nanostructures on Ni foam substrates. The electrodes demonstrated excellent electrochemical and battery properties. The charge transfer resistance dropped 88.8% compared with the electrode without MWNTs. A high specific capacitance of 1350.42 F·g was reached at the current density of 6.5 A·g. The electrode exhibited a superior rate capability with 92.5% retention in 25,000 cycles. Direct MWNT growth benefits the supercapacitor application for low charge transfer resistance and strong MWNT-current collector binding.
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http://dx.doi.org/10.3390/nano9050703DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566365PMC
May 2019

Long-term exposure to the non-steroidal anti-inflammatory drug (NSAID) naproxen causes thyroid disruption in zebrafish at environmentally relevant concentrations.

Sci Total Environ 2019 Aug 23;676:387-395. Epub 2019 Apr 23.

Zhejiang Environmental Monitoring Center, Hangzhou 310012, China; College of Environment, Zhejiang University of Technology, Hangzhou 310032, China. Electronic address:

The presence of trace levels of pharmaceuticals is an emerging issue impacting the aquatic ecosystem. Naproxen (NPX) is a nonsteroidal anti-inflammatory drug (NSAID) that has been frequently detected in aquatic environments worldwide. Recently, concerns regarding endocrine disruption by NSAIDs have increased; however, their effects on the thyroid system have yet to be understood. In this study, zebrafish were utilized to evaluate the thyroid-disrupting effects of NPX. After a 60-day exposure to various concentrations of NPX (0.1, 1, 10 and 100 μg/L), the body length and weight of the zebrafish were significantly decreased. The decrease of cytochrome P450 gene expression and enzyme activity might inhibit the metabolism of NPX, which might result in the significant bioconcentration in zebrafish. Thyroid hormone (TH) analysis showed that both triiodothyronine (T3) and thyroxine (T4) levels were substantially decreased. Gene transcription expressions along the hypothalamic-pituitary-thyroid (HPT) axis were also markedly affected. Significant downregulation of dio1, dio2, nis, nkx2.1, pax8, tg, tpo, trβ and ttr levels, along with the stimulation of the tshβ gene, were also observed in exposed fish compared to controls. Western blot analysis indicated that expression of the TTR protein was significantly decreased, which coincides with the results of the gene expression analysis. Collectively, our observations show that NPX increases the risk of bioconcentration and thyroid disruption in zebrafish. Given the continued increasing consumption and emission of pharmaceuticals, thyroid disruption should be considered when assessing the aquatic risk of long-term exposure to environmentally relevant concentrations of pharmaceuticals.
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http://dx.doi.org/10.1016/j.scitotenv.2019.04.323DOI Listing
August 2019

Dual-functionalized hyaluronic acid as a facile modifier to prepare polyanionic collagen.

Carbohydr Polym 2019 Jul 29;215:358-365. Epub 2019 Mar 29.

College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350108, PR China. Electronic address:

Hyaluronic acid (HA) is a natural polysaccharide possesses outstanding physiological activities. In this work, HA was activated as a novel collagen modifier via the esterification reaction between N-hydroxysuccinimide (NHS) and the carboxyl groups of HA. Both of Fourier transform infrared spectroscopy (FTIR) and H- nuclear magnetic resonance (NMR) spectra indicated the successful synthesis of HA-NHS esters. As reflected by FTIR, circular dichroism (CD) and sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE), collagens modified with HA-NHS ester maintained its intact triplex structure with larger molecular weight. The resultant polyanionic collagen displayed an excellent dissolubility in the neutral water to form a clear solution, due to the significantly lower isoelectric point values (3.8-4.4) compared with that of the native collagen (7.1). In addition, the thermal transition temperature of collagen was significantly increased (16 °C) after modifying with HA-NHS esters. Both of the aggregation morphology and rheological property exhibited high dependence on the NHS/COOH ratio of HA-NHS esters, as reflected by field-emission scanning electron microscopy (FESEM) and rheological test, respectively. The present study offered a novel dual-functional modifier based on the design of HA-NHS ester to obtain water-soluble collagen with desired thermal stability and rheological property, which will significantly widen the application range of collagen, especially in the fields of injectable biodegradable materials and cosmetics.
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http://dx.doi.org/10.1016/j.carbpol.2019.03.086DOI Listing
July 2019

An overview of chlorophenols as contaminants and their removal from wastewater by adsorption: A review.

J Environ Manage 2019 Jul 11;241:59-75. Epub 2019 Apr 11.

College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian province, China. Electronic address:

In this review article, a significant number of published articles (over three decades) were consulted in order to provide comprehensive literature information about chlorophenols, their sources into the environment, classification, and toxicity, various wastewater treatment methods for their removal as well as the characteristics of their adsorption by various adsorbents. Organizing the scattered available information on a wide range of potentially effective adsorbents in the removal of chlorophenols is the principal objective of this article. Various adsorbents such as natural materials, waste materials from industries, agricultural by-products and biomass-based activated carbon in the removal of various chlorophenols have been compiled and discussed here. Crucial factors like temperature, solution pH, contact time and initial solution concentration are also reported and discussed here. The π-π dispersion interaction mechanism, hydrogen bonding formation mechanism, and the electron donor-acceptor complex mechanism were proposed for the chlorophenols adsorption onto various adsorbents with the help of current literature. Conclusions have been drawn proposing a few suggestions for future research on mitigating the effect of chlorophenols in the environment.
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http://dx.doi.org/10.1016/j.jenvman.2019.04.004DOI Listing
July 2019

Self-Healing Cellulose Nanocrystals-Containing Gels via Reshuffling of Thiuram Disulfide Bonds.

Polymers (Basel) 2018 Dec 15;10(12). Epub 2018 Dec 15.

College of Material Engineering, Fujian Agriculture and Forestry University, No. 63, Xiyuangong Road, Fuzhou 350108, China.

Self-healing gels based on reshuffling disulfide bonds have attracted great attention due to their ability to restore structure and mechanical properties after damage. In this work, self-healing gels with different cellulose nanocrystals (CNC) contents were prepared by embedding the thiuram disulfide bonds into gels via polyaddition. By the reshuffling of thiuram disulfide bonds, the CNC-containing gels repair the crack and recover mechanical properties rapidly under visible light in air. The thiuram disulfide-functionalized gels with a CNC content of 2.2% are highly stretchable and can be stretched approximately 42.6 times of their original length. Our results provide useful approaches for the preparation of dynamic CNC-containing gels with implications in many related engineering applications.
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http://dx.doi.org/10.3390/polym10121392DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401874PMC
December 2018

Novel Kinetic Models of Xylan Dissolution and Degradation during Ethanol Based Auto-Catalyzed Organosolv Pretreatment of Bamboo.

Polymers (Basel) 2018 Oct 15;10(10). Epub 2018 Oct 15.

College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.

Due to the invalidity of traditional models, pretreatment conditions dependent parameter of susceptible dissolution degree of xylan (d) was introduced into the kinetic models. After the introduction of d, the dissolution of xylan, and the formation of xylo-oligosaccharides and xylose during ethanol based auto-catalyzed organosolv (EACO) pretreatments of bamboo were well predicted by the pseudo first-order kinetic models (R² > 97%). The parameter of d was verified to be a variable dependent of EACO pretreatment conditions (such as solvent content in pretreatment liquor and pretreatment temperature). Based on the established kinetic models of xylan dissolution, the dissolution of glucan and the formation of degradation products (furfural and acetic acid) could also be empirically modeled (R² > 97%). In addition, the relationship between xylan and lignin removal can provide guidance for alleviating the depositions of lignin or pseudo-lignin. The parameter of d derived novel kinetic models can not only be used to reveal the multi-step reaction mechanisms of xylan, but also control the final removal of main components in bamboo during EACO pretreatments, indicating scientific and practical significance for governing the biorefinery of woody biomass.
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http://dx.doi.org/10.3390/polym10101149DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403872PMC
October 2018