1,128 results match your criteria seo ions

In-depth characterization of non-human sialic acid (Neu5Gc) in human serum using label-free ZIC-HILIC/MRM-MS.

Anal Bioanal Chem 2021 Jul 7. Epub 2021 Jul 7.

Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea.

Sialic acid Neu5Gc, a non-human glycan, is recognized as a new harmful substance that can cause vascular disease and cancer. Humans are unable to synthesize Neu5Gc due to a genetic defect that converts Neu5Ac to Neu5Gc, but Neu5Gc is often observed in human biological samples. Therefore, the demand for accurately measuring the amount of Neu5Gc present in human blood or tissues is rapidly increasing, but there is still no method to reliably quantify trace amounts of a non-human sugar. Read More

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Novel Characterization of Constipation Phenotypes in ICR Mice Orally Administrated with Polystyrene Microplastics.

Int J Mol Sci 2021 May 29;22(11). Epub 2021 May 29.

Department of Biomaterials Science (BK21 FOUR Program), College of Natural Resources & Life Science/Life and Industry Convergence Research Institute/Laboratory Animal Resources Center, Pusan National University, Miryang 50463, Korea.

Indirect evidence has determined the possibility that microplastics (MP) induce constipation, although direct scientific proof for constipation induction in animals remains unclear. To investigate whether oral administration of polystyrene (PS)-MP causes constipation, an alteration in the constipation parameters and mechanisms was analyzed in ICR mice, treated with 0.5 μm PS-MP for 2 weeks. Read More

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Organic Hollow Mesoporous Silica as a Promising Sandalwood Essential Oil Carrier.

Molecules 2021 May 7;26(9). Epub 2021 May 7.

School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China.

As film-forming agents, fillers and adsorbents, microplastics are often added to daily personal care products. Because of their chemical stability, they remain in the environment for thousands of years, endangering the safety of the environment and human health. Therefore, it is urgent to find an environmentally friendly substitute for microplastics. Read More

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Self-Powered, Stretchable, and Wearable Ion Gel Mechanoreceptor Sensors.

ACS Sens 2021 05 18;6(5):1940-1948. Epub 2021 May 18.

Institute of Advanced Machinery Design Technology, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.

Mechanoreceptors in human skin are important and efficient cutaneous sensors that are highly sensitive, selective, and adaptive to the environment. Among these, Merkel disk (MD) and cilia are capable of sensing an external mechanical force through a receptor with a sharp pillar-like structure at its end. Then, the signal of the action potential is generated by pumping Na ions through ion channels. Read More

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Negative Air Ions Alleviate Particulate Matter-Induced Inflammation and Oxidative Stress in the Human Keratinocyte Cell Line HaCaT.

Ann Dermatol 2021 Apr 8;33(2):116-121. Epub 2021 Mar 8.

Department of Dermatology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.

Background: Recent studies have revealed that particulate matter induces inflammation, oxidative stress, and several skin diseases. Experimental results have also shown that negative air ions are highly effective in removing particulate matter-induced inflammation.

Objective: The present study aimed to investigate whether negative air ions can inhibit inflammatory responses and reduce oxidative stress in HaCaT cells exposed to particulate matters. Read More

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Lattice-Oxygen-Stabilized Li- and Mn-Rich Cathodes with Sub-Micrometer Particles by Modifying the Excess-Li Distribution.

Adv Mater 2021 May 29;33(18):e2100352. Epub 2021 Mar 29.

Department of Energy Engineering, Department of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.

In recent years, Li- and Mn-rich layered oxides (LMRs) have been vigorously explored as promising cathodes for next-generation, Li-ion batteries due to their high specific energy. Nevertheless, their actual implementation is still far from a reality since the trade-off relationship between the particle size and chemical reversibility prevents LMRs from achieving a satisfactory, industrial energy density. To solve this material dilemma, herein, a novel morphological and structural design is introduced to Li Mn Ni Co O , reporting a sub-micrometer-level LMR with a relatively delocalized, excess-Li system. Read More

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Sorption behavior of cesium on silt and clay soil fractions.

J Environ Radioact 2021 Jul 26;233:106592. Epub 2021 Mar 26.

Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, Daedeok-daero, 989-111, Yuseong-gu, Daejeon, Republic of Korea.

The effect of clay mineral composition on Cs adsorption behavior of silt and clay fractions (SC-fractions) of soil was investigated. Surface soil samples were collected within 2 km of Kori and Wolsong nuclear power plants in South Korea, and SC-fractions (<20 μm) were separated. The physicochemical properties of SC-fractions and types of clay minerals contained in the SC-fractions were analyzed. Read More

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Effect of Cobalt Oxides on the Catalytic Combustion of Odor.

J Nanosci Nanotechnol 2021 Jul;21(7):4077-4080

Department of Environmental System Engineering, Chonnam National University, Yeosu Jeonnam, 59626, Republic of Korea.

The catalytic combustion of acetaldehyde was studied using various types of Co oxides and Co-PC. The Co oxides and Co-PC were characterized using an X-ray diffractometer (XRD), X-ray photo-electron spectroscopy (XPS), and a particle sizing analyzer. The Co-PC and CoO were converted into Co₃O₄ under an air atmosphere at 450 °C, and the results were confirmed using the XRD and XPS. Read More

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Construction of quantum dots self-decorated BiVO/reduced graphene hydrogel composite photocatalyst with improved photocatalytic performance for antibiotics degradation.

Chemosphere 2021 Jul 23;275:130052. Epub 2021 Feb 23.

Department of Physics, Dongguk University, Seoul, 04620, South Korea. Electronic address:

In this study, we report the construction of a novel composite photocatalyst (BiVO/rGH) composed of quantum dots (QDs) self-decorated BiVO-nanoparticels (NPs) and reduced graphene hydrogel (rGH). The composite structures were prepared using an in-situ growth method. The BiVO/rGH composite photocatalysts exhibited excellent photocatalytic efficiency for the degradation of tetracycline hydrochloride (TCHCl). Read More

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Consumer acceptability and monetary value perception of iced coffee beverages vary with drinking conditions using different types of straws or lids.

Food Res Int 2021 02 28;140:109849. Epub 2020 Oct 28.

Department of Food Science, University of Arkansas, 2650 North Young Avenue, Fayetteville, AR 72704, USA. Electronic address:

A recent trend of environmental sustainability has induced many coffee providers to offer alternatives to plastic straws. There has been little research regarding consumer perception of these alternative drinking conditions. This study aimed to determine differences in consumer perception of iced coffee beverages (without ice cubes) between plastic straw and alternative drinking conditions. Read More

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February 2021

Molecular Level Differences in Ionic Solvation and Transport Behavior in Ethylene Oxide-Based Homopolymer and Block Copolymer Electrolytes.

J Am Chem Soc 2021 Mar 22;143(8):3180-3190. Epub 2021 Feb 22.

Pritzker School of Molecular Engineering, University of Chicago, 5640 S Ellis Ave, Chicago, Illinois 60637, United States.

Block copolymer electrolytes (BCE) such as polystyrene--poly(ethylene oxide) (SEO) blended with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and composed of mechanically robust insulating and rubbery conducting nanodomains are promising solid-state electrolytes for Li batteries. Here, we compare ionic solvation, association, distribution, and conductivity in SEO-LiTFSI BCEs and their homopolymer PEO-LiTFSI analogs toward a fundamental understanding of the maximum in conductivity and transport mechanisms as a function of salt concentration. Ionic conductivity measurements reveal that SEO-LiTFSI and PEO-LiTFSI exhibit similar behaviors up to a Li/EO ratio of 1/12, where roughly half of the available solvation sites in the system are filled, and conductivity is maximized. Read More

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Bacterial cellulose nanofibrils-armored Pickering emulsions with limited influx of metal ions.

Carbohydr Polym 2021 Apr 30;258:117730. Epub 2021 Jan 30.

School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea. Electronic address:

This study introduces a hydrophobically modified bacterial cellulose nanofibrils (BCNF)-stabilized Pickering emulsion system, which can limit the influx of metal ions through the interface. We showed that the C18 alkyl chain-grafted BCNF (BCNF) can readily associate to generate a resilient thin membrane at the oil-water interface regardless of the type of oil, which is essential for the production of stable emulsion drops. The viscoelasticity of BCNF-armored Pickering emulsion was feasibly tunable by manipulating the grafting amount of the C18 alkyl chains, as well as controlling the BCNF concentration. Read More

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Genotoxicity of Water Extract from Bark-Removed Stokes.

Molecules 2021 Feb 8;26(4). Epub 2021 Feb 8.

Institute of Bioscience & Integrative Medicine, Daejeon University, 176 split 75 Daedeokdae-ro Seo-gu, Daejeon 35235, Korea.

(RVS) has been traditionally used as an herbal remedy to support the digestive functions in traditional Korean medicine. Additionally, the pharmacological effects of RVS, including antioxidative, antimicrobial and anticancer activities, have been well-reported. The genotoxicity of RVS, however, is elusive; thus, we evaluated the genotoxicity of RVS without bark (RVX) for safe application as a resource of functional food or a medical drug. Read More

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February 2021

Evaluation of kinetic salt-enrichment behavior and separation performance of HFC-152a hydrate-based desalination using an experimental measurement and a thermodynamic correlation.

Water Res 2021 Apr 28;193:116882. Epub 2021 Jan 28.

Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea. Electronic address:

Hydrate-based desalination (HBD), a type of freezing-based desalination, can concentrate salts of saline water and produce fresh water via hydrate crystal formation. In this study, the thermodynamic stability, crystallographic information, and kinetic growth behavior of HFC-152a hydrate were investigated to estimate the desalination efficiency of HBD. The phase equilibria revealed that the HFC-152a hydrate could be formed at a higher temperature in the presence of NaCl (0 wt%, 3. Read More

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Mass spectrometry imaging of untreated wet cell membranes in solution using single-layer graphene.

Nat Methods 2021 03 4;18(3):316-320. Epub 2021 Feb 4.

Department of New Biology, DGIST, Daegu, Republic of Korea.

We report a means by which atomic and molecular secondary ions, including cholesterol and fatty acids, can be sputtered through single-layer graphene to enable secondary ion mass spectrometry (SIMS) imaging of untreated wet cell membranes in solution at subcellular spatial resolution. We can observe the intrinsic molecular distribution of lipids, such as cholesterol, phosphoethanolamine and various fatty acids, in untreated wet cell membranes without any labeling. We show that graphene-covered cells prepared on a wet substrate with a cell culture medium reservoir are alive and that their cellular membranes do not disintegrate during SIMS imaging in an ultra-high-vacuum environment. Read More

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Energetically Preferred Bilayered Coacervation of Oppositely Charged ZrHP Nanoplatelets.

ACS Appl Mater Interfaces 2021 Feb 3;13(6):7664-7671. Epub 2021 Feb 3.

School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.

A platform is introduced for bilayered coacervation of oppositely charged nanoplatelets (NPLs) at the oil-water interface. To this end, we synthesized two types of zirconium hydrogen phosphate (ZrHP) NPLs, cationically charged NPLs (CNPLs), and anionically charged NPLs (ANPLs) by conducting surface-initiated atom transfer radical polymerization. Taking advantage of the platelet geometry and controlled wettability, we demonstrated that ANPLs and CNPLs coacervate themselves to form a bilayered NPL membrane at the interface, which was directly confirmed by confocal laser scanning microscopy. Read More

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February 2021

Effects of virgin olive oil and grape seed oil on physicochemical and antimicrobial properties of pectin-gelatin blend emulsified films.

Int J Biol Macromol 2021 Feb 6;171:262-274. Epub 2021 Jan 6.

Nutrition Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.

The active emulsified blend films based on gelatin-pectin (5% w/w) containing virgin olive oil (VOO) (0.1-0.3 g/g biopolymer) and grape seed oil (GSO) (0. Read More

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February 2021

Serially pH-Modulated Hydrogels Based on Boronate Ester and Polydopamine Linkages for Local Cancer Therapy.

ACS Appl Mater Interfaces 2021 Jan 8;13(2):2189-2203. Epub 2021 Jan 8.

College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea.

Elaborately and serially pH-modulated hydrogels possessing optimized viscoelastic natures for short gelation time and single syringe injection were designed for peritumoral injection of an anticancer agent. Boronate ester bonds between phenylboronic acid (PBA) (installed in HA-PBA (HP)) and dopamine (included in HA-dopamine (HD)) along with self-polymerization of dopamine (via interactions between HD conjugates) were introduced as the main cross-linking strategies of a hyaluronic acid (HA) hydrogel. Considering p values (8. Read More

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January 2021

Larvicidal composite alginate hydrogel combined with a Pickering emulsion of essential oil.

Carbohydr Polym 2021 Feb 21;254:117381. Epub 2020 Nov 21.

Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea. Electronic address:

Sulfonated cellulose nanocrystals (S-CNCs) can be used to encapsulate thyme white essential oil (EO) that is volatile and immiscible with water. S-CNCs form a Pickering emulsion (PE) with EOs and the micron-scale PEs are embedded in sodium alginate (SA) to form macroscale hydrogel beads. The incorporation of PEs with SA is confirmed with FTIR, XRD, SEM and confocal microscopic characterizations and the release behavior is monitored to understand the time-dependent biological activity of the EOs. Read More

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February 2021

Antibacterial, proangiogenic, and osteopromotive nanoglass paste coordinates regenerative process following bacterial infection in hard tissue.

Biomaterials 2021 01 9;268:120593. Epub 2020 Dec 9.

Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, 31116, Republic of Korea; Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, 31116, Republic of Korea; Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, 31116, Republic of Korea; UCL Eastman-Korea Dental Medicine Innovation Centre, Dankook University, Cheonan, 31116, Republic of Korea; Cell & Matter Institute, Dankook University, Cheonan, 31116, South Korea. Electronic address:

Bacterial infection raises serious concerns in tissue repair settings involved with implantable biomaterials, devastating the regenerative process and even life-threatening. When hard tissues are infected with bacteria (called 'osteomyelitis'), often the cases in open fracture or chronic inflammation, a complete restoration of regenerative capacity is significantly challenging even with highly-dosed antibiotics or surgical intervention. The implantable biomaterials are thus needed to be armored to fight bacteria then to relay regenerative events. Read More

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January 2021

Preparation of nanobiocomposite film based on lemon waste containing cellulose nanofiber and savory essential oil: A new biodegradable active packaging system.

Int J Biol Macromol 2021 Feb 24;169:352-361. Epub 2020 Dec 24.

Department of Food Science and Technology, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

Lemon waste after industrial juice extraction encompasses of valuable bio-components that stimulated the development of novel and biodegradable films. Lemon waste powder (LWP) based nanobiocomposite films were prepared by incorporating different concentrations of cellulose nanofiber (CNF) (3 and 6% w/w) and savory essential oil (SEO) (1.5 and 3% w/w) in order to modify physical, mechanical and antimicrobial properties of the films. Read More

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February 2021

Virucidal efficacy of acidic electrolyzed water (AEW) against African swine fever virus and avian influenza virus.

J Vet Med Sci 2021 Feb 11;83(2):201-207. Epub 2020 Dec 11.

Veterinary Drugs & Biologics Division, Animal and Plant Quarantine Agency, 177 Hyeoksin 8-ro, Gimcheon-si, Gyeongsangbuk-do 39660, Republic of Korea.

This study evaluated the virucidal efficacy of acidic electrolyzed water (AEW) against African swine fever virus (ASFV) and avian influenza virus (AIV), according to the Animal and Plant Quarantine Agency (APQA) guidelines for efficacy testing of veterinary disinfectants. AEW (pH 5.0-6. Read More

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February 2021

Anti-oxidant copper layer by remote mode N plasma for low temperature copper-copper bonding.

Sci Rep 2020 12 10;10(1):21720. Epub 2020 Dec 10.

Graduate School of Nano-IT Design, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Korea.

An anti-oxidant Cu layer was achieved by remote mode N plasma. Remote mode plasma treatment offers the advantages of having no defect formation, such as pinholes, by energetic ions. In this study, an activated Cu surface by Ar plasma chemically reacted with N free radicals to evenly form Cu nitride passivation over the entire Cu surface. Read More

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December 2020

Technical Note: Characteristics of a microSilicon X shielded diode detector for photon beam dosimetry.

Med Phys 2021 Apr 6;48(4):2004-2009. Epub 2021 Mar 6.

Department of Radiation Oncology, Osaka University Graduate School of Medicine, 2-2 (D10), Yamadaoka, Suita, Osaka, 565-0871, Japan.

Purpose: This study investigated the characteristics of a new shielded diode detector, microSilicon X (model 60022: MSX), for small-field and large-field dosimetry.

Methods: The percent depth dose (PDD), beam profiles, detector output factor (OF ), temperature dependence, dose rate dependence, dose-per-pulse (DPP) dependence, and dose-response linearity of MSX were evaluated in Cyberknife and TrueBeam photon beams and compared with various detectors including microDiamond (PTW model 60019: MD), Sun Nuclear EDGE detector, Photon diode (PTW model 60016: PD), and semiflex ionization chamber (PTW model 31010: IC).

Results: For field sizes ranging from 50 × 50 mm to 400 × 400 mm , MSX-measured OF values were within 1% of the IC-measured values. Read More

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Automated technique for high-pressure water-based window cleaning and accompanying parametric study.

PLoS One 2020 3;15(12):e0242413. Epub 2020 Dec 3.

School of Mechanical Engineering, Hanyang University, Seoul, Korea.

The maintenance of buildings has become an important issue with the construction of many high-rise buildings in recent years. However, the cleaning of the outer walls of buildings is performed in highly hazardous environments over long periods, and many accidents occur each year. Various robots are being studied and developed to reduce these incidents and to relieve workers from hazardous tasks. Read More

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January 2021

Development of a Bioactive Flowable Resin Composite Containing a Zinc-Doped Phosphate-Based Glass.

Nanomaterials (Basel) 2020 Nov 22;10(11). Epub 2020 Nov 22.

BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea.

Flowable resins used for dental restoration are subject to biofilm formation. Zinc has antibacterial properties. Thus, we prepared a zinc-doped phosphate-based glass (Zn-PBG) to dope a flowable resin and evaluated the antibacterial activity of the composite against () to extrapolate the preventative effect toward secondary caries. Read More

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November 2020

ZIF-8 templated assembly of La-anchored ZnO distorted nano-hexagons as an efficient active photocatalyst for the detoxification of rhodamine B in water.

Environ Pollut 2021 Mar 20;272:116018. Epub 2020 Nov 20.

Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, Republic of Korea. Electronic address:

The use of lanthanum-anchored zinc oxide distorted hexagon ([email protected] DH) nanoclusters as an active material for the photodegradation of rhodamine B (Rh-B) dye via hydrogen bonding, electrostatic, and π-π interactions is examined herein. The active photocatalyst is derived from porous zeolite imidazole frameworks (ZIF-8) via a combined ultrasonication and calcination process. The distorted hexagon nanocluster morphology with controlled surface area is shown to provide excellent catalytic activity, chemical stability and demarcated pore volume. Read More

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Aqueous Two-Phase System (ATPS)-Based Polymersomes for Particle Isolation and Separation.

ACS Appl Mater Interfaces 2020 Dec 25;12(49):55467-55475. Epub 2020 Nov 25.

Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Korea.

Aqueous two-phase systems (ATPSs) have been widely used in the separation, purification, and enrichment of biomolecules for their excellent biocompatibility. While ultracentrifugation and microfluidic devices have been combined with ATPS to facilitate the separation of biomolecules and achieve high recovery yields, they often lack the ability to effectively isolate and separate biomolecules in low concentrations. In this work, we present a strategy that leverages the preferential partitioning of biomolecules in ATPS droplets to efficiently separate model extracellular vesicle (EV) particles. Read More

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December 2020

Distribution Characteristics of Indoor PM Concentration Based on the Water Type and Humidification Method.

Int J Environ Res Public Health 2020 11 20;17(22). Epub 2020 Nov 20.

Department of Construction Science, College of Architecture, Texas A&M University, TX 77843, USA.

With the industrialization and rapid development of technology that can measure the concentration of pollutants, studies on indoor atmosphere assessment focusing on occupants have been recently conducted. Pollutants that worsen indoor atmosphere include gaseous and particulate matter (PM), and the effects and diffusion characteristics that influence indoor atmosphere vary depending on the indoor and outdoor concentration. White dust is a PM generated from minerals in water used for humidifiers during winter. Read More

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November 2020

Fenton-like reaction, glutathione reduction, and photothermal ablation-built-in hydrogels crosslinked by cupric sulfate for loco-regional cancer therapy.

Biomater Sci 2021 Feb 24;9(3):847-860. Epub 2020 Nov 24.

College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea.

Fenton-like reaction-associated chemodynamic therapy (CDT) and hyperthermia-inducing photothermal therapy (PTT)-combined crosslinked hydrogel systems were developed for loco-regional cancer therapy. Cupric sulfate (Cu) has been employed to crosslink the catechol-functionalized hyaluronic acid (HC) polymer-based gel via metal-catechol coordination and covalent bonding of the catechol group (by pH adjustment). Cu can also be used as a hydroxyl radical-generating agent with endogenous HO in cancer cells mediated by Fenton-like reaction and it can reduce intracellular glutathione (GSH) levels leading to the inhibition of reactive oxygen species (ROS) scavenging. Read More

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February 2021