153 results match your criteria suspended chitosan

The use of natural organic flocculants for harvesting microalgae grown in municipal wastewater at different culture densities.

Physiol Plant 2021 Mar 29. Epub 2021 Mar 29.

Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, Umeå, Sweden.

Harvesting microalgae from liquid culture is a difficult issue to solve and is most commonly done through settling. However, settling is a slow process on its own and generally needs to be induced chemically or by introducing stress to the culture. Polymeric, cationic substances, such as cationised starch and chitosan, are often used for flocculation and settling. Read More

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Insight into the synergistic photocatalytic-adsorptive removal of methyl orange dye using TiO/chitosan based photocatalyst.

Int J Biol Macromol 2020 Dec 24;165(Pt B):2462-2474. Epub 2020 Oct 24.

Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia; Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia.

The removal of methyl orange (MO) dye has been studied using TiO/chitosan-montmorillonite (TiO/Cs-MT) bilayer photocatalyst which also functions as an adsorbent. The dye removal experiments were conducted in the dark and under UV-Vis light irradiation via adsorption and photocatalysis-adsorption processes, respectively. The adsorption modelings were employed on the dark experimental data and compared with the immobilized and suspended Cs-Mt counterparts. Read More

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December 2020

Construction of a Three-Dimensional Interpenetrating Network Sponge for High-Efficiency and Cavity-Enhanced Solar-Driven Wastewater Treatment.

ACS Appl Mater Interfaces 2021 Mar 25;13(9):10902-10915. Epub 2021 Feb 25.

College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, China.

It is well known that the photothermal conversion performance of solar-driven interfacial water evaporation systems is known to have a stronger photothermal conversion performance than suspended water evaporation systems due to their relatively strong ability to suppress overall heat loss. Natural polymer chitosan and gelatin can form a three-dimensional interpenetrating network (IPN) sponge to provide an interface for water evaporation due to strong hydrogen bonding and electrostatic attraction interaction. However, the lack of effective light absorption, the intrinsic short lifetime, and the poor photothermal conversion greatly compromise their steam generation performance. Read More

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A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes.

Mar Drugs 2021 Feb 10;19(2). Epub 2021 Feb 10.

Leibniz-Institut Fuer Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany.

Flocculation is still one of the most important and efficient processes for water treatment. However, most industrial processes, such as in water treatment plants, still use huge amounts of synthetic polyelectrolytes for the flocculation process. Here we compare the flocculation of two different suspended particles, i. Read More

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February 2021

Chitosan-Alginate-Pectin-coated Suspended-Liquid-Encapsulating (CAPSuLE) marbles for therapeutic agent storage and delivery.

Biomater Sci 2021 Mar;9(5):1639-1651

Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Korea.

Developing a cutting-edge system capable of ensuring long-lasting functionality of therapeutic agents and implementing diverse delivery modes is challenging. A quasi-spherical triple-layered capsule containing suspended liquid droplets and allowing multi-modal delivery of therapeutic agents in the aqueous phase was developed, primarily by adopting the core principles for creating liquid marbles. A naturally derived wettable polysaccharide-pectin-was utilized as a liquid-air interfacial barrier to keep the liquid droplets in the core zone. Read More

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Characterization of titanium oxide optical band gap produced from leachate sludge treatment with titanium tetrachloride.

Environ Sci Pollut Res Int 2021 Apr 5;28(14):17587-17601. Epub 2021 Jan 5.

School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, 14300, Penang, Malaysia.

This study investigated the coagulation performance of titanium tetrachloride (TiCl) for leachate treatment and preparation of titanium oxide (TiO) from generated sludge through calcination process at different temperatures and times. TiCl with chitosan as coagulant aid employed to perform coagulation process on Alor Ponhsu Landfill leachate. Further calcination process was done to synthesize TiO from produced sludge for photocatalytic applications. Read More

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Chemical stabilization of dispersed Escherichia coli for enhanced recovery with a handheld electroflotation system and detection by Loop-mediated Isothermal AMPlification.

PLoS One 2021 5;16(1):e0244956. Epub 2021 Jan 5.

Department of Molecular Biosciences & Bioengineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States of America.

Constraints related to sample preparation are some of the primary obstacles to widespread deployment of molecular diagnostics for rapid detection of trace quantities (≤103 CFU/mL) of food-borne pathogens. In this research, we report a sample preparation method using a novel handheld electroflotation system to concentrate and recover dilute quantities (102-103 CFU/mL) of Escherichia coli (E. coli) 25922 in artificially contaminated samples for reliable, rapid detection by loop-mediated isothermal amplification (LAMP). Read More

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January 2021

Tetracycline hydrochloride degradation by heterogeneous photocatalysis using TiO(P25) immobilized in biopolymer (chitosan) under UV irradiation.

Water Sci Technol 2020 Oct;82(8):1570-1578

Laboratoire de Génie de l'Environnement (LGE), Faculté de Technologie, Université de Bejaia, 6000 Bejaia, Algeria.

TiO(P25) has been widely used to treat wastewater; however, the elimination of TiO(P25) suspended in the treated water causes running costs and induces secondary pollution, which greatly restricts its practical applications. Consequently, several methods have been implemented to immobilize TiO(P25) on various substrates. This work deals with the immobilization of TiO(P25) in chitosan film by using the cross-linking method. Read More

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October 2020

Regeneration of Rat Sciatic Nerve Using PLGA Conduit Containing Rat ADSCs with Controlled Release of BDNF and Gold Nanoparticles.

J Mol Neurosci 2021 Apr 7;71(4):746-760. Epub 2020 Oct 7.

Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.

Implantation of a nerve guidance conduit (NGC) carrying neuroprotective factors is promising for repairing peripheral nerve injury. Here, we developed a novel strategy for repairing peripheral nerve injury by gold nanoparticles (AuNPs) and brain-derived neurotrophic factor (BDNF)-encapsulated chitosan in laminin-coated nanofiber of Poly(l-lactide-co-glycolide) (PLGA) conduit and transplantation of rat adipose-derived stem cells (r-ADSCs) suspended in alginate. Then, the beneficial effect of AuNPs, BDNF, and r-ADSCs on nerve regeneration was evaluated in rat sciatic nerve transection model. Read More

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Micro-Polluted Surface Water Treated by Yeast-Chitosan Bio-Microcapsules.

Materials (Basel) 2020 Aug 10;13(16). Epub 2020 Aug 10.

Key Laboratory of Yangtze River Water Environment Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.

Ammonia nitrogen and natural organic matter (NOM) seriously degrade the quality of surface waters. In this study, the optimum preparation conditions of a yeast-chitosan bio-microcapsule of the strain, used to treat micro-polluted surface water, were investigated. Fourier transform infrared spectroscopy and scanning electron microscopy were used to characterize the bio-microcapsules. Read More

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Effective production of multifunctional magnetic-sensitive biomaterial by an extrusion-based additive manufacturing technique.

Biomed Mater 2020 12 16;16(1):015011. Epub 2020 Dec 16.

Department of Materials Engineering and Ceramics (DEMaC), CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal.

A calcium phosphate (CaP)-based scaffold used as synthetic bone grafts, which smartly combines precise dimensions, controlled porosity and therapeutic functions, presents benefits beyond those offered by conventional practices, although its fabrication is still a challenge. The sintering step normally required to improve the strength of the ceramic scaffolds precludes the addition of any biomolecules or functional particles before this stage. This study presents a proof of concept of multifunctional CaP-based scaffolds, fabricated by additive manufacturing from an innovative ink composition, with potential for bone regeneration, cancer treatment by local magnetic hyperthermia and drug delivery platforms. Read More

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December 2020

Polymeric micelles for the ocular delivery of triamcinolone acetonide: preparation and evaluation in a rabbit ocular inflammatory model.

Drug Deliv 2020 Dec;27(1):1115-1124

Department of Pharmaceutics, Faculty of Pharmacy, Assiut University, Assiut, Egypt.

The aim of this study was to prepare triamcinolone acetonide (TA)-loaded poly(ethylene glycol)--poly(ε-caprolactone) (PEG--PCL) and poly(ethylene glycol)--poly(lactic acid) (PEG--PLA) micelles as a potential treatment of ocular inflammation. The micelles were evaluated for particle size, drug loading capacity and drug release kinetics. Selected micellar formulations were dispersed into chitosan hydrogel and their anti-inflammatory properties were tested in rabbits using a carrageenan-induced ocular inflammatory model. Read More

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December 2020

A method for reclaiming nutrients from aquacultural waste for use in soilless growth systems.

Water Sci Technol 2020 Jan;81(1):81-90

Feedback Aquaculture, 4950 Risør, Norway.

The aim of this work was to develop a method that allows the recovery of nutrients from aquaculture sludge, not only to alleviate the disposal problem, but also to address the future scarcity of non-renewable fertilizers. This method includes two steps: Nutrient mobilization using aerobic digestion followed by solids precipitation using chitosan as the flocculant. The aerobic digestion experiments were conducted in aerated batch reactors, while a jar test apparatus was used to assess the capacity of chitosan to remove total suspended solids (TSS) and turbidity. Read More

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January 2020

Role of moderately hydrophobic chitosan flocculants in the removal of trace antibiotics from water and membrane fouling control.

Water Res 2020 Jun 5;177:115775. Epub 2020 Apr 5.

Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK. Electronic address:

In this paper we describe the preparation and testing of a new class of chitosan-based flocculants for the treatment of surface waters containing antibiotic compounds. Three forms of moderately hydrophobic chitosan flocculants (MHCs) were prepared by chemically grafting hydrophobic branches with different lengths onto hydrophilic chitosan and these were evaluated by jar tests and a bench-scale continuous flow ultrafiltration (UF) membrane process with coagulation/sedimentation pre-treatment. Tests were conducted using both synthetic and real surface water in which norfloxacin and tylosin were added as representative antibiotics at an initial concentration of 0. Read More

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Microstructured optical fiber based Fabry-Pérot interferometer as a humidity sensor utilizing chitosan polymeric matrix for breath monitoring.

Sci Rep 2020 04 7;10(1):6002. Epub 2020 Apr 7.

Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China.

This study reports a method for humidity sensing based on a specialty microstructured optical fiber (MOF). A suspended tri-core MOF was fabricated using the stack and draw technique. A low finesse sensing head was prepared by depositing a chitosan polymer matrix within the holes of the MOF, forming a Fabry-Pérot interferometer as a sensing platform while the chitosan film acts as the sensing material. Read More

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Investigating interactions of phthalate environmental toxicants with lipid structures.

Colloids Surf B Biointerfaces 2020 Jun 2;190:110923. Epub 2020 Mar 2.

School of Engineering, Center for Biomedical Engineering, Institute for Molecular and Nanoscale Innovation, Brown University, Providence, RI, United States. Electronic address:

Di(2-ethylhexyl) phthalate (DEHP) is one of the most abundant plasticizers in common household products. It leaches from materials, resulting in exposure associated with detrimental health effects. The main objective of this study was to investigate how DEHP and its metabolite, mono(2-ethylhexyl) phthalate (MEHP), interact with and permeate lipid structures, namely vesicles and planar bilayers. Read More

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In Vivo and In Vitro Evaluation of a Novel Hyaluronic Acid-Laminin Hydrogel as Luminal Filler and Carrier System for Genetically Engineered Schwann Cells in Critical Gap Length Tubular Peripheral Nerve Graft in Rats.

Cell Transplant 2020 Jan-Dec;29:963689720910095

Institute of Neuroanatomy and Cell Biology, Hannover Medical School, Hannover, Germany.

In the current study we investigated the suitability of a novel hyaluronic acid-laminin hydrogel (HAL) as luminal filler and carrier system for co-transplanted cells within a composite chitosan-based nerve graft (CNG) in a rat critical nerve defect model. The HAL was meant to improve the performance of our artificial nerve guides by giving additional structural and molecular support to regrowing axons. We filled hollow CNGs or two-chambered nerve guides with an inserted longitudinal chitosan film (CNG[F]s), with cell-free HAL or cell-free HA or additionally suspended either naïve Schwann cells (SCs) or fibroblast growth factor 2-overexpressing Schwann cells (FGF2-SCs) within the gels. Read More

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Nutrient Reduction of Dairy Manure Through Solid-Liquid Separation with Flocculation and Subsequent Microalgal Treatment.

Appl Biochem Biotechnol 2020 Apr 27;190(4):1425-1437. Epub 2019 Nov 27.

Department of Biological Engineering, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844, USA.

High concentrations of dairy operations in Southern Idaho have brought up big challenges for proper manure management to alleviate the eutrophication stress. In order to explore more technologies confronting the high nutrient load in dairy manure, a sequential process combining enhanced solid-liquid separation through flocculation-centrifuge and the subsequent microalgal growth in the liquid part was studied in this study. Solid-liquid separation by flocculation-centrifuge process, using a natural flocculant chitosan and a flocculation aid kaolin, was optimized through response surface methodology (RSM) technique using central composite design (CCD) method. Read More

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Antibacterial activity and mechanism of action of chitosan nanofibers against toxigenic Clostridioides (Clostridium) difficile Isolates.

Ann Ig 2020 Jan-Feb;32(1):72-80

Department of Bacteriology & Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran - Bioinformatics and Computational Biology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.

Background: Clostridioides difficile a Gram-positive, obliged anaerobic, rod-shaped spore-former bacterium, causes a wide spectrum of diseases, ranging from mild, self-limiting diarrhoea to serious diarrhea. Chitosan, a natural polysaccharide, is largely known for its activity against a wide range of microorganisms. Chitosan, in the form of nanofibrils (nanofibrilated chitosan), consists of separated fibers which can be suspended easily in aqueous media. Read More

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January 2021

Amphiphilic quaternary ammonium chitosan/sodium alginate multilayer coatings kill fungal cells and inhibit fungal biofilm on dental biomaterials.

Mater Sci Eng C Mater Biol Appl 2019 Nov 8;104:109961. Epub 2019 Jul 8.

Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854, USA. Electronic address:

Formation of fungal biofilms on health care-related materials causes serious clinical consequences. This study reports a novel fungal repelling strategy to control fungal biofilm formation on denture biomaterials through layer-by-layer self-assembly (LBL). Amphiphilic quaternary ammonium chitosans (CS612) were synthesized and used as the antimicrobial positive layer, and sodium alginate (SA) was chosen as the negative layer to construct LBL multilayers on poly (methyl methacrylate) (PMMA)-based denture materials. Read More

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November 2019

Fabrication of lightweight and reusable salicylaldehyde functionalized chitosan as adsorbent for dye removal and its mechanism.

Int J Biol Macromol 2019 Dec 5;141:626-635. Epub 2019 Sep 5.

Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West-Bengal 711103, India. Electronic address:

Bio-resources have a very significant role in current research approach for the synthesis of benign functionalized biological macromolecules for their stable structural integrity and inherent nature-inspired potentialities. Here, chitosan is used as a core moiety for designing of a porous adsorbent after the attachment of salicylaldehyde to remove the toxic dyes. Salicylaldehyde linked chitosan, with excellent surface porosity, lightweight, non-glucose and low-cost feature, makes it as an efficient adsorbent. Read More

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December 2019

The efficacy of sustained-release chitosan microspheres containing recombinant human parathyroid hormone on MRONJ.

Braz Oral Res 2019 Aug 29;33:e086. Epub 2019 Aug 29.

Istanbul University-Cerrahpaşa, Vocational School of Health Care Services, Istanbul, Turkey.

Treatment of patients with bisphosphonate usage is a significant concern for oral surgeons because it interferes with jaw bone turnover and regeneration. In case of adverse effects manifesting related to bisphosphonate use, oral surgeons are usually treating and keep the patient's symptoms under control. In this study, we aimed to investigate a new treatment protocol for medication-related osteonecrosis of the jaw (MRONJ). Read More

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Candida albicans Infection Model in Zebrafish (Danio rerio) for Screening Anticandidal Drugs.

Mycopathologia 2019 Oct 31;184(5):559-572. Epub 2019 Aug 31.

College of Veterinary Medicine, Chungnam National University, Yuseong-gu, Daejeon, 34134, Republic of Korea.

Background: Candida albicans is an opportunistic fungal pathogen which causes systemic infections in human. In this study, C. albicans infection model was developed in zebrafish to understand the host-pathogen interactions for straightforward anticandidal drug screening. Read More

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October 2019

Microbial Corrosion Resistance and Antibacterial Property of Electrodeposited Zn-Ni-Chitosan Coatings.

Molecules 2019 May 22;24(10). Epub 2019 May 22.

CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, No.7 Nanhai Road, Qingdao 266071, China.

Microbial corrosion is a universal phenomenon in salt water media such as seawater and wastewater environments. As a kind of efficient protective metal coating for steel, the damage of the Zn-Ni alloy coating was found to be accelerated under microbial corrosive conditions. To solve this problem, chitosan, which is considered a natural product with high antibacterial efficiency, was added to Zn-Ni electrolytes as a functional ingredient of electrodeposited Zn-Ni-chitosan coatings. Read More

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Enzyme-Immobilized Chitosan Nanoparticles as Environmentally Friendly and Highly Effective Antimicrobial Agents.

Biomacromolecules 2019 07 16;20(7):2477-2485. Epub 2019 May 16.

Department of Chemical and Biological Engineering , Korea University , Seoul 02841 , Korea.

Highly effective and minimally toxic antimicrobial agents have been prepared by immobilizing glucose oxidase (GOx) onto biocompatible chitosan nanoparticles (CS-NPs). CS-NPs were prepared via ionotropic gelation and used for the immobilization of GOx via approaches of covalent attachment (CA), enzyme coating (EC), enzyme precipitate coating (EPC), and magnetic nanoparticle-incorporated EPC (Mag-EPC). EPC represents an approach consisting of enzyme covalent attachment, precipitation, and cross-linking, with CA and EC being control samples while Mag-EPC was prepared by mixing magnetic nanoparticles (Mag) with enzymes during the preparation of EPC. Read More

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Modulation of the Release of a Non-Interacting Low Solubility Drug from Chitosan Pellets Using Different Pellet Size, Composition and Numerical Optimization.

Pharmaceutics 2019 Apr 10;11(4). Epub 2019 Apr 10.

Department of Pharmaceutical Technology, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.

Two size classes of piroxicam (PXC) pellets (mini (380-550 μm) and conventional (700-1200 μm)) were prepared using extrusion/spheronization and medium viscosity chitosan (CHS). Mixture experimental design and numerical optimization were applied to distinguish formulations producing high sphericity pellets with fast or extended release. High CHS content required greater wetting liquid volume for pellet formation and the diameter decreased linearly with volume. Read More

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Microwave assisted synthesis and characterization of a novel bio-based flocculant from dextran and chitosan.

Int J Biol Macromol 2019 Jun 19;131:760-768. Epub 2019 Mar 19.

Department of Pharmaceutical Engineering, School of Food and Biological Engineering, Hefei University of Technology, 193# Tunxi Road, Hefei 230009, Anhui Province, PR China. Electronic address:

Polysaccharide-modified flocculants as natural polymeric flocculants are receiving increased attention in the field of water treatment. In this study, a novel high-efficiency and ecofriendly flocculant was synthesized using dextran and chitosan. The flocculant-production method was based on a microwave-heating-initiated graft reaction. Read More

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Graphene-modified electrodes for sensing doxorubicin hydrochloride in human plasma.

Anal Bioanal Chem 2019 Mar 9;411(8):1509-1516. Epub 2019 Feb 9.

Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520-IEMN, 59000, Lille, France.

Doxorubicin (DOX), an anthracycline molecule, is currently one of the most widely used anticancer drugs in clinics. Systematic treatment of patients with DOX is known to be accompanied by several unpleasant side effects due to the toxicity of the drug. Thus, monitoring of DOX concentration in serum samples has become increasingly important to avoid side effects and ensure therapeutic efficiency. Read More

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An integrated method for controlling the offensive odor and suspended matter originating from algae-induced black blooms.

Chemosphere 2019 Apr 11;221:526-532. Epub 2019 Jan 11.

College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China.

Potentially toxic algae-induced black blooms can trigger crises in urban water supplies and have fatal effects on aquatic ecosystems. Urgent disposal methods to mitigate the taste and odor are imperative for ensuring the safety of the drinking water supply. In this study, we tested three oxidants and two flocculants to improve water quality after the occurrence of a black bloom. Read More

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PVA/CS and PVA/CS/Fe gel beads' synthesis mechanism and their performance in cultivating anaerobic granular sludge.

Chemosphere 2019 Mar 3;219:130-139. Epub 2018 Dec 3.

Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Biomass washout from high-speed anaerobic suspended bed bio-reactors is still a challenge to their stable operation. Preserving active biomass to efficiently retain biomass in the reactor is one of the solutions to this problem. Herein, two carriers (polyvinyl alcohol/chitosan (PVA/CS) and PVA/CS/Fe gel beads) were prepared using the cross-linking method. Read More

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