COLLOID AND POLYMER SCIENCE
·
2022
·Vol. 300
·期 10
·1187-1195
·
IF 2.434
Li Xin,Gao Yongfeng,Li Yaozong,Li Yanqun,Liu Haotian,Yang Zhuohong,Wu Hong,Hu Yang
Cinnamon essential oil (CNO) is a natural and renewable antibacterial agent. However, CNO is highly volatile and unstable, which limits its practical application as a long-term and wide antibacterial agent. In order to improve the CNO stability, we have microencapsulated CNO into composite microcapsules basing on Pickering emulsion stabilized by silica (SiO 2 ) nanoparticles. The CNO-loaded composite microcapsules possess the hybrid microcapsule shell including SiO 2 , xanthan gum and chitosan. Moreover, the results show that the microcapsules have spherical appearance. Microencapsulation technique effectively promotes the CNO stability, and the loaded CNO is slowly released from microcapsules. The antibacterial test indicates that the minimal inhibitory concentration of microcapsules was 2 mg mL −1 against Escherichia coli and Staphylococcus aureus , and the microcapsules can play an effective long-term antibacterial effect. Thus, Pickering emulsion templates is a convenient and effective technique to construct antibacterial essential oil-contained microcapsules, which can be used as long-term antibacterial agents.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2022
·
IF 2.712
Shuang Yang,Linhao Lan,Mingda Gong,Ke Yang,Xiaoming Li
An effective dressing is essential for wound healing. In fact, the wettability performance is one of the most important factors of a wound dressing. The fundamental functions of a wound dressing involve the absorption of excess exudates and maintenance of optimal moisture at the wound by controlling water evaporation. Here, we designed a type of chitosan (CS) sponge and PCL nanofibrous membrane composite dressing with asymmetric wettability surfaces as wound healing materials for biomedical applications. The hydrophobic surfaces of the composite dressing were waterproof and could efficiently control the water vapor transmission rate, whereas the hydrophilic surface of the CS sponge had good cytocompatibility and water-absorbing capability. Insulin-like growth factor-2 (IGF-2) was added to the CS sponge, and exhibited a stimulatory effect on fibroblasts migration and proliferation. Therefore, the fabricated CS sponge and PCL membrane composite dressing had excellent cytocompatibility, vapor transmission rate, and liquid absorption and asymmetric wettability, suggesting its potential as a promising alternative to traditional wound dressing.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Meng Wang,Huihua Huang,Chaokang Huang,Shujun Liu,Xiaohong Peng
Bacterial infection and oxidative stress seriously delay wound healing. Here, magnolol-grafted-chitosan hydrochloride (CSCl-MAG) was synthesized and crosslinked with genipin to form hydrogel (CSM H). By embedding magnolol-loaded chitosan nanocapsules (MCNGs) into CSM H, we designed a novel nanocapsule- embedded hydrogel dressing (MCNG-H) with sustained antibacterial and antioxidant properties. The swelling, rheology , cytotoxicity, antibacterial and antioxidant properties of MCNG-H were studied. MCNG-H exhibited good swelling properties and biocompatibility. The antibacterial and antioxidant assays in vitro demonstrated the corporative effect of CSM-H and MCNGs in inhibiting bacteria and eliminating reactive oxygen species (ROS). Moreover, MCNG-H revealed the pH-responsive release profiles of loaded MAG, and ensured sustained release of MAG with the dual protective effects of MCNG and CSM H, which helped to maintain long-term antibacterial and antioxidant activities. Finally, MCNG-H significantly accelerated wound healing in a splinted excisional dermal wound model, promising a competitive dressing for the treatment of infected wounds.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Jia-Lin Miao,Jia-Qi Ren,Hui-Jing Li,Da-Gang Wu,Yan-Chao Wu
A mesoporous crosslinked chitosan-activated clinoptilolite biocomposite (CS-GA/ACP) was prepared with chitosan (CS) as the substrate and glutaraldehyde (GA) as the crosslinking agent. Structural analysis of the CS-GA/ACP composite beads was performed using FTIR, SEM , and BET techniques. The adsorption properties of the CS-GA/ACP for Congo red (CR) and methylene blue (MB) removal were examined using a batch method. The effects of CS loading, CS-GA/ACP dosages (0.005–0.25 g), pH values (3−11), initial concentrations (30–300 mg/L), contact time (5–120 min), ionic strength , and temperatures (25–65 ℃) on the adsorption of CR and MB on the CS-GA/ACP composite beads were investigated. The pseudo-second-order kinetics could better describe the adsorption process than the pseudo-first-order kinetics, and the Langmuir isotherms model agreed well with the experimental data. The maximum adsorption capacities of the CS-GA/ACP for CR and MB were 180.59 mg/g and 143.67 mg/g at 25 ℃, respectively. The proposed mechanism studies showed that the possible interaction between the adsorbent and dye molecules were Yoshida H-bonding, dipole-dipole H-bonding, electrostatic interaction and n-π interaction. The CS-GA/ACP can be recycled to remove dyes without significant loss of efficacy, and the adsorption of dyes on the CS-GA/ACP is spontaneous endothermic adsorption. Overall, the CS-GA/ACP showed an excellent performance for dyes removal in aqueous solution and could be a practical candidate for industrial applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULAR PHARMACEUTICS
·
2022
·
IF 5.364
Xiaozhu Chen,Hong Zhang,Chu Wang,Yue Su,Min Xiong,Xiaohua Feng,Daishi Chen,Zhaoyang Ke,Lu Wen,Gang Chen
Overexpression of apoptotic factors in the inner ear is generally proven to induce ototoxicity. This has aroused research interest in various antiapoptotic drugs, the most representative of which is curcumin (CUR). In this study, two nanoformulations of CUR were developed with sustained-release behavior to improve their protective effects against ototoxic hearing loss (HL), which were the nanoparticles of CUR-loaded poly(lactic acid–glycolic acid) (CUR-PLGA NPs) and CUR-loaded chitosan-coated PLGA NPs (CUR-CS/PLGA NPs). The obtained results revealed that both CUR-NPs provided otoprotection in vitro and in vivo, and their effective doses in guinea pigs were much less than that of dexamethasone, which was clinically used to treat HL. Moreover, relative to CUR and CUR-PLGA NPs, CUR-CS/PLGA NPs exhibited the highest accumulation in HEI-OC1 cells and guinea pigs’ cochlea. In pharmacodynamic experiments, the optimal administration timing was investigated, and CUR-CS/PLGA NPs showed sustained efficacy and the best hearing improvement at all tested sound frequencies. Lastly, the protective effect of CUR nanoformulations was further validated via inhibition of Caspase-3 and Bax activation, thereby reducing the concentration of reactive oxygen species and protecting mitochondrial integrity in hair cells. Collectively, CUR-CS/PLGA NPs demonstrated potent and lasting effects against ototoxic HL, making our novel formulation a promising candidate for the alleviation of sensorineural HL.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Junjie Wang,Yu Yang,Lijie Huang,Lili Kong,Xing Wang,Jingru Shi,Yinghua Lü,Haibo Mu,Jinyou Duan
Vancomycin (Van) remains one of the first-line drugs for the treatment of wound infections caused by methicillin-resistant Staphylococcus aureus (MRSA). However, the unsatisfactory bioavailability of vancomycin alone has greatly limited its potential health benefits. Here a responsive chitosan-based hydrogel was developed as the delivery system which not only would reduce this side effect but also increase efficacy of vancomycin. The hydrogel was prepared by grafting chitosan and cinnamaldehyde-based thioacetal (CTA) together with ginipin (G) as the crosslinker. Upon exposure to reactive oxygen species which were enriched in the bacterial wound, the hydrogel can locally degrade and sustainably release the loaded vancomycin near the lesion to compete with the troubling MRSA. Compared with vancomycin alone, the chitosan-based hydrogel loaded with vancomycin demonstrated accelerated acute wound healing. This achievement reveals that this multi-functional hydrogel may be a promising drug-delivery device for improving the efficacy of local antibiotic therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Yadong Wu,Miaomiao Jin,Yudong Huang,Fang Wang
As an emergent interdisciplinary subject, tissue engineering is widely used in the maintenance, repair, replacement, and reconstruction of the structure and function of cartilage, blood vessels, heart, skin, and liver. Tissue engineering includes three elements: seed cells, tissue engineering scaffolds, and tissue construction. Among them, tissue engineering scaffolds, especially porous scaffolds, play an important role. The support material should have ideal physical, chemical, and mechanical properties matching with the actual application, such as specific size and shape, an appropriate pore size, and appropriate porosity and surface properties. As a kind of natural biopolymeric linear polysaccharide, chitosan (CHi) has sterling properties including being nontoxic, nonirritant, biocompatible, bacteriostatic, and excellently hydrophilic. Aramid fibers (AF) belong to a class of synthetic fibers that are thermally stable, chemically stable, and highly temperature-resistant and have low mass and a long service life. Previous studies have demonstrated that bulk AF can be effectively split into aramid nanofibers (ANFs) via dissolution in a system of dimethyl sulfoxide (DMSO)/potassium hydroxide (KOH). Composite aerogels own a three-dimensional and pore-like structure with the advantages of light weight, high porosity, and large specific surface area, which are suitable for use in the field of tissue engineering. Addressed herein is the composite aerogel synthesized from CHi and ANFs using chemical crosslinking with glutaraldehyde (GA) for a tissue engineering scaffold, named ANFs/CHi/GA. The composite was characterized using Fourier transform infrared spectroscopy and X-ray diffraction. ANFs/CHi/GA was bacteriostatic with abundant cell adhesions and a uniform cell distribution. Cytotoxicity tests prove that the composite aerogel materials are nontoxic and the cells could proliferate greatly in their leaching solutions. Cells can adhere to and distribute well on the surface of the composite aerogel material, which is suitable for use in scaffold materials.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Xu Zhang,Bowen Tan,Yanting Wu,Min Zhang,Xi Xie,Jinfeng Liao
Hydrogels can mimic extracellular matrix and provide a suitable microenvironment for accelerating wound healing. Nevertheless, the complicated wound condition, the disturbance of external forces, and the manufacturing process of the dressing were still difficult problems. An injectable self-healing hydrogel with mild photothermal therapy (MPTT) was developed for wound healing via dynamic Schiff bonds. After covalently incorporating GO-BPEI (branched polyethyleneimine grafting graphene oxide), an observable mechanical strength improvement and photothermal conversion property of GO-BPEI/carboxymethylated chitosan (CMCS) /aldehyde terminated polyethylene glycol (PEG-CHO) (GCP) hydrogel has been witnessed. MPTT induced by near-infrared (NIR) irradiation could accelerate NIH-3 T3 cells proliferation in vitro . Moreover, in vivo wound defect healing and histological analysis suggested that GCP hydrogels incorporated with MPTT significantly accelerated wound healing by improving collagen fibers deposition, enhancing re-epithelialization, and promoting granulation tissue neogenesis. The GCP hydrogels provide a unique route for wound dressing and present new inspirations for complicated wound management.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Xinhu Gong,Caimei Zhao,Yang Wang,Ying Luo,Chaoqun Zhang
Through a simple strategy of immersion in a mixed solution of water/ethylene glycol (EG)/lithium chloride (LiCl), self-healing carboxymethyl chitosan (CA) hydrogels, that is, CA/N-vinylpyrrolidone-EG-Li+ hydrogels (CEH) with an ultra-low-temperature freezing resistance below −70 °C were fabricated. The introduction of electrolyte ions and small-molecule polyol also made these hydrogels highly conductive (0.8 S m–1) and imparted antidrying property to them, showing stable and reversible sensitivity to finger-wrist bending as well as 150 cycles of stretching. Such hydrogels also presented highly efficient self-healing ability, with a stress–strain healing efficiency of over 90%. Furthermore, the CEH-based sensors maintained a stable sensing performance over a wide range of temperatures below the freezing point (from −10 to −70 °C) and exhibited stable sensitivity to temperatures with fast response and no significant hysteresis. The present work is expected to provide a simple and sustainable route for the preparation of multifunctional antifreezing conductive hydrogels based on CA, leading to a wide range of potential applications in soft sensor devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuangan Chen,Bo Feng,Jinxiu Peng,Ziming Wang
An effective reagent combination plays a crucial role in the flotation separation of galena and sphalerite. In this work, potassium permanganate (KMnO 4 ) was used to amplify the property difference between galena and sphalerite, carboxylated chitosan (CCS) was used to selectively depress sphalerite. The mechanism of CCS in the separation of galena and sphalerite was investigated by microcalorimetric measurements, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The results indicated that the rate of sphalerite oxidation by KMnO 4 is significantly faster than galena, and more metal oxides will be produced on the surface of sphalerite. The metal oxides provided active sites for CCS to adsorb on the surface of sphalerite via chemisorption, and the adsorption of CCS hindered the further adsorption of potassium butylxanthate (PBX). Meanwhile, the slower oxidation rate of galena means that fewer metal oxides are produced. In addition, CCS is mainly adsorbed on the surface of galena through physical adsorption, which is easy to fall off, so the surface of galena can further adsorb PBX. Thus, flotation separation of galena and sphalerite is achieved.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yan Sun,Youlu Chu,Chao Deng,Huining Xiao,Weibing Wu
In recent years, aerogel has been reported as a good thermal insulation material. However, it has remained a great challenge to realize high mechanical property and excellent anti-fouling performance concurrently of aerogel in practical applications. Here, a composite aerogel was developed via directional freezing and chemical vapor deposition (CVD) modification using chitosan (CS) and montmorillonite (MMT) as heat-resistant raw materials and cellulose nanofibrillated fiber (CNF) as reinforcing filler. The intercalation between the CS molecular chain and MMT endows the aerogel with excellent mechanical properties . Due to the anisotropic structure, the axial Young's modulus is high up to 630 KPa, and the radial thermal conductivity is as low as 31 mW m −1 K −1 . Meanwhile, the aerogel shows a high limiting oxygen index (LOI) value of 43%. Furthermore, CVD treatment increases the contact angles to water and various oils higher than 150°, which portects the aerogle from being contaminated by common liquids. Compared to conventional insulation materials, this aerogel can maintain excellent insulation performance in extreme environments such as heavy rain or oil leakage. The composite aerogel is expected to play an important role in the fields of house warmth, vehicle interior, aviation, and etc.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yadong Wang,Jun Yuan,Li Ma,Xianze Yin,Zongmin Zhu,Pingan Song
As a very promising biodegradable polymer, polylactic acid (PLA) has been applied in various fields. Unfortunately, the disadvantages of flammability and large amounts of molten droplets limit its application. In this work, we constructed a novel flame-retardant system by combining the as-prepared bio-based chitosan derivative (CS-TE) and aluminum hypophosphite (AP), and used it to improve the flame retardancy and anti-dripping property. When 3.75 wt% CS-TE and 11.25 wt% AP were incorporated into PLA, the PLA composite had a limiting oxygen index of 28.5 % and achieved a UL-94 V-0 rating as well as showed excellent anti-dripping behavior. Meanwhile, the peak heat release rate and total smoke production decreased by 52.3 % and 73.4 % respectively.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）