CELLULOSE
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2018
·Vol. 25
·期 3
·1987-1996
·
IF 3.809
He Meng,Chen Hao,Zhang Xinjiang,Wang Chengshuang,Xu Cheng,Xue Yuting,Wang Jinshan,Zhou Panghu,Zhao Qingxin
In the present study, novel cellulose and chitosan composite hydrogels and films were constructed by directly dissolving cellulose and chitosan in alkali/urea aqueous solutions followed by a facile blending method and a mild coagulation process in an ethyl acetate gaseous phase. The structure and properties of the cellulose/chitosan composite materials were characterized by Field emission scanning electron microscopy, FTIR, wide angle X-ray diffraction, mechanical test and antibacterial experiment etc. The results indicated that there is strong hydrogen bonding interaction between cellulose and chitosan. The composite hydrogels exhibited homogeneous porous structure and the resultant films exhibited relative high light transmittance, indicating good miscibility between cellulose and chitosan due to their structure similarity. The mechanical strength increased with the cellulose content for the composite films, while the equilibrium swelling ratio, antibacterial activity and biocompatibility increased with the chitosan content. Facial mask shaped composite hydrogels with heavy metal ion adsorbability could be prepared facilely by using glass molds. Thus, the composite materials showed potential applications in the facial mask, antimicrobial packaging and water treatment fields.
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MATERIALS LETTERS
·
2018
·
IF 2.687
Licheng Lin,Zhentao Li,Xi Song,Yanpeng Jiao,Changren Zhou
In this study, chitosan and lanthanum hydroxide composite aerogel beads were prepared for phosphorus adsorption via co precipitation and supercritical carbon dioxide drying technique. The porous structure of composite aerogel beads was investigated by scanning electron microscope (SEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) measurements. The results showed that the aerogel bead with mass ratio of chitosan to lanthanum chloride 100:50 exhibited a larger surface area of 172.74 m 2 /g and a pore volume of 1.05 cm 3 /g, respectively. Also the phosphorus adsorption kinetics of the aerogel bead showed a faster adsorption rate and the larger adsorption capacity (148.33 mg/g) for phosphorus. In addition, adsorption kinetics model analysis showed that the phosphorus adsorption process fitted both pseudo-first order and pseudo-second order kinetic model.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Yun Liao,Meng Wang,Dajun Chen
The relatively low density of functional groups of graphene oxide (GO) and the difficulty to completely recover after adsorption limit its application in uranium (U(VI)) removal from aqueous solution. Inspired by a special chemical property, polydopamine (PDA) was first used as a surface modifying agent for GO, and then the as-formed GO@PDA cross-linked with chitosan (CS) to assemble a three-dimensional (3D) porous GO@PDA/CS aerogel for U(VI) adsorption. Morphology and structure of the aerogel were characterized by TEM, SEM, FTIR, XPS, XRD, Raman, and TGA. The results show that compared to GO/CS, the GO@PDA/CS aerogel possesses a more homogeneous and well-organized 3D porous structure as well as the enhanced active sites, which are beneficial for U(VI) removal. According to batch experiments, the adsorption rate of the GO@PDA/CS aerogel was very fast, and the adsorption equilibrium could be reached in 15 min at pH = 6.0. Its maximum adsorption capacity for U(VI) is as high as 415.9 mg g–1 at 298 K calculated from the Langmuir model. In addition, the as-prepared GO@PDA/CS aerogel exhibits satisfactory thermal and mechanical stability and could be recycled six times without an apparent decrease in removal efficiency.
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PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Hongxia Wang,Jun Qian,Houbin Li,Fuyuan Ding
Traditional ink owning harmful components has caused many problems, so this paper developed chitosan-TiO 2 edible inks and used it as the model to study the relationship between rheology and printing, for better development of edible inks. Rheological properties and the corresponding fitting were investigated. The developed ink exhibited non-Newtonian behavior, shear-thinning behavior, and temperature-dependent properties. Shear strain, frequency and temperature had great impact on modulus of inks. Low J ( t ) (compliance) values reflected strong material structure and the related final recovery ratio attained 65.9%. Based on the fitting results, the screen-printing simulation were further researched for closer practical application. The recovery rate reached 55% with high initial recovery coefficient (K 3 = 10.7), indicating that the ink recovered sooner to the high viscosity after the shear was released and was suitable for printing. The ink was also printed on coated paper. Fastness was up to 91% and scratch resistance achieved H. The print effect on black cardboard and PET film was also excellent. The prepared edible ink provides a novel alternative to traditional ink and holds great potential in printing industry, especially on food.
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Zhanying Li,Lin Shao,Wenbin Hu,Tingting Zheng,Lingbin Lu,Yang Cao,Yongjun Chen
Absorption is one of the most important methods for oil spill cleanup. An ideal absorbent is expected to possess advantages of low cost, green, high absorption capacity and excellent reusability. In this paper, a new kind of cellulose aerogel was successfully fabricated via cellulose oxidation, crosslinking, freeze drying and cold plasma modification. The obtained aerogel (water contact angle up to 152.8°) exhibited outstanding oil/water selectivity and high absorption capacity (13.77–28.20 g/g) for various oils and organic solvents. What's more, this kind of aerogel could be reused by simple compression. The absorption-desorption process could be repeated for at least 50 cycles. Through the kinetic analysis, it was found that the pseudo-second order model was more appropriate for the aerogel’s oil absorption process. Owing to its low cost, hydrophobicity, high absorption capacity and excellent reusability, this kind of aerogel is expected to be used in oils and organic solvents spill cleanup and oil/water separation field.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Yuan-Fu Ding,Shengke Li,Lijun Liang,Qiaoxian Huang,Lihui Yuwen,Wenjing Yang,Ruibing Wang,Lian-Hui Wang
The photosensitizer Chlorin e6 (Ce6) has been frequently employed for photodynamic therapy (PDT) of cancer; however, its nonspecific toxicity has limited its clinical applications. In this study, we prepared chitosan nanoparticles (CNPs), with a mean diameter of approximately 130 nm, by a nonsolvent-aided counterion complexation method in an aqueous solution, into which Ce6 could be physically entrapped during the preparation process. These CNPs and Ce6-loaded CNPs (CNPs-Ce6) were fully characterized by UV–vis, photoluminescence, and Fourier transform infrared spectroscopic analysis, as well as dynamic light scattering and transmission electron microscopy measurements. More importantly, the biocompatibility of the otherwise toxic Ce6 was significantly improved upon its loading into the CNPs, as demonstrated by both confocal laser scanning microscopy analysis and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays. Furthermore, the PDT efficiency of Ce6-loaded CNPs was dramatically enhanced, in comparison with that of the free Ce6, as shown by both MTT and flow cytometry assays. This discovery provides a novel strategy for improving the biocompatibility and therapeutic efficacy of PDT agents by using a natural, biocompatible polysaccharide carrier.
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PubMed
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ACS Omega
·
2018
·
IF 0
Yuangang Liu,Weiji Weng,Shibin Wang,Ruimin Long,Hanwen Li,Huihui Li,Tengteng Li,Mengyi Wu
Diabetes mellitus is the most common endocrine disease worldwide; hyperglycemia is a hallmark of this disease. To alleviate the pain caused by diabetes, developing and utilizing effective diabetic drugs to maintain or recover the function of the residual β-cells is an attractive therapeutic approach. γ-aminobutyric acid (GABA) has been shown to have such effects, but it is easy to have reduced GABA activity under physiological conditions. In the present study, GABA–chitosan nanoparticles (GABA–CS NPs) were prepared, and glucose homeostasis, pancreatic β-cell protection, and anti-inflammatory effects of GABA–CS NPs were investigated in vivo. The results showed that blood glucose levels and IL-1β levels in the GABA–CS NP-administered group were both significantly lower, whereas the PDX1 expression was significantly higher than that of the impaired group (p < 0.01). This indicates that GABA–CS NPs can efficiently maintain glucose homeostasis, protect β-cells, and inhibit inflammation. These nanoparticles have the potential to be applied for future diabetes theranostics.
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DOI
PubMed
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Ying Shao,Chunhua Wu,Tiantian Wu,Yuan Li,Shiguo Chen,Chunhong Yuan,Yaqin Hu
Eugenol is widely used in food industries where it encounters major concerns such as its poor solubility and stability. Herein, a novel eugenol-nanoemulsion was prepared by using ultrasonication as emulsification techniques, chitosan nanoparticle as carrier, and surfactant, as emulsifier. The results indicated that droplet size and encapsulation efficiency of the nanoemulsions was significantly affected by testing factors. The selected parameters for nanoemulsions were determined as chitosan-eugenol ratio of 1:1, Tween20 1 wt/v%, ultrasonic power 450 W and ultrasonic time 6 min. The nanoparticles were performed in regularly spherical shape distributed within 80–100 nm. Besides, the nanoemulsions showed great storage stability and thermal stability and the nanoeparticles performed excellent antioxidant capacity, antimicrobial activity as well as an initial burst of eugenol followed by plateau. Therefore, eugenol-chitosan nanoemulsions had great potential in food formulations for extending the shelf life.
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PubMed
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xiaonan Huo,Wei Li,Yu Wang,Na Han,Jianping Wang,Ning Wang,Xingxiang Zhang
In order to reduce environmental pollution during microencapsulating phase change materials and expand their applications as well, a novel eco-friendly microencapsulated/nanoencapsulated phase change materials (Micro/NanoPCMs) and the corresponding encapsulation method were proposed and discussed in this study, where the natural chitosan and side-chain crystallizable comb-like polymer were selected as shell material and core material, respectively. During the encapsulating process via coacervation, the effects of different core-shell ratios on the morphology and thermal storage properties of microcapsules were discussed. FE-SEM and TEM was employed to investigate the morphology and microstructure of the microcapsules. The thermodynamics performance of microcapsules was studied using TGA and DSC. The encapsulation efficiency of microcapsules ranged from 49.82% to 68.99%, and the thermal stability temperature of microcapsules was measured to be 243.2 °C. The fabrication process where natural raw materials were employed and showing promising applications in such fields as medical treatment.
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PubMed
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ADVANCES IN POLYMER TECHNOLOGY
·
2017
·Vol. 37
·期 6
·2186-2194
·
IF 1.291
Zheng Zhang,Tingting Li,Yuan Liu,Fang Shang,Bing Chen,Yunxia Hu,Sui Wang,Zhiyong Guo
Supramolecular hydrogels are increasingly fascinating soft polymeric materials formed by noncovalent interactions. Poly(vinyl alcohol) (PVA), chitosan and graphite oxide (GO), good biocompatibility, and nontoxicity, are green materials with potential applications in biomaterials. Herein, a dual cross-link supramolecular hydrogel of PVA/chitosan in the presence of GO was prepared. Without addition of any organic cross-linker, the dual-network PVA/chitosan hydrogel was obtained, namely GO nanosheets as 2D cross-linker and H-bonding between PVA chains. For one thing, GO nanosheets induce the physical network formation through electrostatic interaction between positively charged PVA, chitosan, and negatively charged GO. For another, PVA chains can be connected by H-bonding through freezing/thawing measurements, resulting in the formation of another physical network. To investigate the performance of the PVA/chitosan/GO hydrogel, infrared spectrum, swelling test, thermal analysis, rheological study, and self-healing tests were conducted. The result showed that PVA/chitosan hydrogel in the presence of GO is not only self-healable, but also pH-responsive and temperature-dependent.
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CHEMICAL ENGINEERING & TECHNOLOGY
·
2017
·Vol. 41
·期 2
·270-277
·
IF 2.051
Juanqin Xue,Sen Wang,Xiaolong Han,Yuqi Wang,Xiufu Hua,Jiding Li
Chitosan-functionalized graphene oxide (CS-GO) was synthesized and incorporated into a poly(vinylidene fluoride) (PVDF) ultrafiltration membrane. The effect of CS-GO addition on the morphology and membrane performance was studied through water contact angle, scanning electron microscopy, atomic force microscopy, porosity, pore size, and permeation measurements as well as rejection tests and antifouling experiments. The CS-GO/PVDF membrane exhibited higher water flux, bovine serum albumin (BSA) rejection rate, and water flux recovery ratio, and lower BSA solution flux attenuation rate than those of unfilled PVDF, CS/PVDF, and GO/PVDF membranes. The excellent water permeability and antifouling performance can be attributed to the high hydrophilicity and good dispersion of CS-GO in the matrix.
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Coatings
·
2024
·Vol. 14
·期 4
·381
·
IF 2.9
Zixu Xie,Zhiran Zheng,Chen Chen,Guofeng Li,Xing Wang
Chitosan exhibits remarkable broad-spectrum antibacterial activity, especially in acidic environments. However, its poor solubility in water and significantly decreased antibacterial performance after membrane formation greatly limit its extensive application. To address this issue, glycol chitosan-4-pyridylcarboxaldehydeborneol (GCBP) was synthesized by conjugating glycol chitosan (GC) with 4-pyridylcarboxaldehydeborneol ester (BP) through dynamic Schiff base bonds utilizing a layer-by-layer self-assembly strategy. When bacteria come into contact with the surface, the local acidic microenvironment triggers the cleavage of the Schiff base, resulting in the release of bactericidal BP and GC for combined sterilization. In vitro results demonstrated that the antibacterial properties of GCBP were positively related to the modification layers. The excellent antibacterial performance of the GCBP modification demonstrates not only great potential for clinical urinary catheters but also for broad antibacterial applications in the medical field.
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