JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.479
Rongli Zhang,Hui Hao,Cuige Zhang,Renchun Yang,Mingyue Sun,Ching-Ping Wong,Ying Xu
A kind of bioadhesive hydrocaffeic acid modified chitosan colloidal particles (HCA-CS/TPP CPs) containing synthetic catecholamine groups was prepared via amidation reaction and ionic gelation. The formation process and property of the HCA-CS/TPP CPs were characterized by ultraviolet visible spectrophotometry and Zeta PALS instruments. The prepared HCA-CS/TPP CPs were then used as particulate emulsifier to stabilize Pickering emulsions. The stability of the Pickering emulsion droplet was characterized by digital camera and optical microscope. The results revealed that HCA-CS/TPP CPs exhibited good emulsifying property at a wide pH value range, which will endow the potential application of the Pickering emulsions stabilized by HCA-CS/TPP CPs in various fields.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Wenqiang Tan,Jingjing Zhang,Xiang Zhao,Qing Li,Fang Dong,Zhanyong Guo
Polysaccharide-based biodegradable films have been considered as the promising candidates for food packaging industry instead of petroleum-based packaging materials. Here, we reported a class of edible composite films based on chitosan ascorbate and methylcellulose prepared by mixing different ratios (1,0, 4:1, 2:1, 1:1, 1:2, 1:4, and 0:1) of the biopolymers using the casting technique. Their physicochemical properties as well as the DPPH radical scavenging ability and reducing power were investigated. All physicochemical properties and antioxidant activities were significantly affected by the chitosan ascorbate/methylcellulose ratio in the matrix. The increases in tensile strength and elongation at break values, maximum decomposition temperatures, whitish index, compactness, moisture content, and a reduction in water vapor permeability were observed as the proportion of methylcellulose increased in the matrix. But the composite films containing a greater proportion of chitosan ascorbate exhibited the better barrier properties against UV–vis light and the stronger DPPH radical scavenging effect and reducing power. The chitosan ascorbate/methylcellulose composite films with interesting physicochemical properties and strong antioxidant action showed the potential value as biodegradable and edible biomaterials for food packaging.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Shangpeng Liu,Jianwei Ma,Shuang Wang,Shaojuan Chen,Bin Wang,Jiwei Li
In this work, silver nanoparticles (Ag NPs) were incorporated into the flower-like hierarchical chitosan/calcium pyrophosphate hybrid microflowers (CS-CaP) via an in situ reduce process by polydopamine (PDA). Scanning electron microscope (SEM) observation, Energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis confirmed the formation of Ag NPs on the petals of CS/CaP (Ag@CS/CaP). Since the hierarchical structure of Ag@CS/CaP facilitates the contact of Ag NPs with bacteria, results of the antibacterial test and cell culture showed that the Ag@CS-CaP has efficient antibacterial properties to both E. coli and S. aureus bacteria without causing cytotoxicity. These results demonstrate the Ag@CS-CaP has the potential capacity for biomedical applications.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2018
·
IF 3.862
Wei Dong,Xiuhua Wang,Chang Liu,Xiao Zhang,Xin Zhang,Xianzhi Chen,Yongqiang Kou,Shirui Mao
In the present study, chitosan based polymer-lipid hybrid nanoparticles (PLNs) were prepared by a self-assembly method and their use as the carrier for oral absorption enhancement of enoxaparin was evaluated. The enoxaparin-loaded nanoparticles were composed of chitosan as the polymer and glyceryl monooleate as the lipid with a lipid/polymer mass ratio ranging from 0 to 0.3, and F127 was added as a stabilizer. It was found that the PLNs showed a higher surface hydrophobicity but mucoadhesive properties similar to those of chitosan based nanocomplexes. Results from DSC experiments and NMR solvent relaxation study indicate that glyceryl monooleate was completely incorporated into the nanoparticles and the lipid/polymer ratio affected the extent of lipid-polymer interaction inside the nanoparticles and the resultant internal structures. The stability of the PLNs in simulated gastrointestinal fluids was also affected by the lipid/polymer ratio; the best stability was shown by nanoparticles with a lipid/polymer ratio of 0.2. Nanoparticles with the optimal composition significantly enhanced the oral bioavailability of enoxaparin with a 4.5-fold increase in AUC in comparison with a solution of enoxaparin. In conclusion, GMO/CS based PLNs can provide a new insight to develop orally applicable delivery system for hydrophilic macromolecules. Their absorption can be enhanced with proposed PLNs and preparation of this PLNs was also found to be easy comparing to other similar methods.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Yanjun Tang,Xinqi Zhang,Ruonan Zhao,Daliang Guo,Junhua Zhang
Nanocrystalline cellulose (NCC) has shown great potential for reinforcing nanocomposite systems, particularly in biopolymer-based nanocomposites. In the present work, transparent and biodegradable chitosan (CH)/guar gum (GG)/NCC nanocomposite films were designed and prepared. The effect of NCC loadings on the rheological behavior of the as-prepared nanocomposite suspensions was investigated, the overall properties of the resultant nanocomposite films as a function of various amounts of NCC were determined, and the surface morphology of various nanocomposite films was characterized by scanning electron microscopy (SEM). Results indicated that the increased NCC loadings increased the shear viscosity of the nanocomposite suspensions. Moreover, as expected, the obtained CH/GG/NCC nanocomposite films were found to exhibit improved tensile strength and reduced air permeability in comparison to pure CH/GG films. This work supported the conclusion that NCC was effective in reinforcing the CH/GG composite films, which may be a promising material for food packaging applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 5
·941-948
·
IF 1.353
Li Xiaojie,Chao Guiqun,Wang Liangan,Xu Xianlin,Cai Zhanjun,Shi Lei,Zhuang Xupin,Cheng Bowen
In this work, an affinity nanofiber membrane was successfully prepared by solution blowing of arginine-modified chitosan (CS-Arg) for bovine serum albumin (BSA) adsorption. CS-Arg was firstly synthesized by coupling L-arginine onto chitosan backbone. Then, CS-Arg nanofiber membranes (CANFs) were fabricated using solution blowing process with Polylactide (PLA) as assistant polymer. The results showed that CANFs effectively adsorbed BSA, and the adsorption capacities were influenced by the degrees of substitution (DS) of arginine in CS, pH value, contact time, and initial protein concentration. The highest adsorption capacity of 445.19 mg/g was achieved uvnder the following conditions: DS of 43.7 %, pH of 7.14, and initial concentration of 3.0 mg/ml. BSA adsorbed on the CANFs membrane conformed to Langmuir model, and the adsorption rate was consistent with the second-order kinetics model. This work implies that an arginine-modified chitosan nanofiber-based novel biomaterial has a potential application in adsorption of BSA.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Yue Tian-Tian,Li Xiao,Wang Xiao-Xiong,Yan Xu,Yu Miao,Ma Jian-Wei,Zhou Yu,Ramakrishna Seeram,Long Yun-Ze
Electrospinning provides an effective method for generating nanofibers from solution of carboxymethyl chitosan/polyoxyethylene oxide (CMCS/PEO). The goal of this work is to explore the potential application of electrospun CMCS/PEO nanofiber membrane in fruit fresh-keeping. The microstructure, antibacterial activity, hydrophilia, and air permeability of the nanofiber membrane have been tested. For comparison, the fresh-keeping effects of commercial cling wrap and CMCS/PEO nanofiber membranes on strawberries’ rotting rate and weight loss rate have been studied. The results indicate that the electrospun CMCS/PEO membrane could effectively avoid water loss in strawberries and has a remarkable effect to prolong strawberries’ shelf life due to its breathability and antibacterial activity. In addition, the composite CMCS/PEO, nanofiber membrane is non-poisonous and edible, which can be used in food industry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2018
·
IF 0
Huimin He,Jinyang Li,Xiaodong Cao,Changshun Ruan,Qi Feng,Hua Dong,Gregory F. Payne
Chitosan is an aminopolysaccharide that can be physically cross-linked through two independent, reversible, and pH-switchable mechanisms. At high pH, neutral chitosan chains can self-assemble to form crystalline domains that serve as one type of physical cross-link (such cross-linked hydrogels are designated Chit0). At low pH, the chains are cationic and dis-assembled from each other but can be electrostatically cross-linked by multivalent anionic micelles of sodium dodecyl sulfate (such cross-linked hydrogels are designated SDS-Chit-H+). Here, we report that the ability to reversibly reconfigure cross-linking mechanisms provides a means to fuse separately prepared chitosan films. Experimentally, neutral Chit0 hydrogel films were first prepared by cathodic electrodeposition, and then separately prepared Chit0 films were fused by overlapping them in the presence of SDS and acid. Qualitative evidence demonstrates fusion across the interface at both the microscale (e.g., SEM) and macroscale. Mechanical testing (e.g., tear test) demonstrates that fusion leads to strong bonding with failure occurring in the bulk region of the film and not at the joint. Potentially, the ability to fuse separately prepared films may provide new opportunities for additive manufacturing of biobased materials.
✓ 已验证
产品关联
DOI
PubMed
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Jianzhe Ma,Yang Lei,Muhammad Asim Khan,Fengyun Wang,Yuting Chu,Wu Lei,Mingzhu Xia,Sidi Zhu
This paper describes a modification method of Na-montmorillonite (Na-Mt) with carboxymethyl-chitosan (CMC). The as-prepared samples were analyzed by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analyzer and thermogravimetric analysis (TGA). Two common tetracycline antibiotics, tetracycline (TET) and chlortetracycline (CTC), were selected as the represented pollutants and adsorbed by CMC-Mt under different experimental conditions. The intercalation of CMC obviously amplified the basal spacing of the interlayers confirmed by XRD measurements and improved the adsorption capacities of montmorillonite to some degree. The results showed that the tetracycline antibiotic sorption onto CMC-Mt was mainly dependent on pH and was not affected by temperature. Besides, the removal of TET and CTC rapidly attained an equilibrium within 2 h of contact time. The kinetic data of adsorption was determined by first-order, second-order kinetics and intraparticle diffusion models. The kinetic study indicates that the TET and CTC adsorption processes obeyed the second-order kinetics. The Freundlich isotherm study was in agreement with the practical data, suggesting a heterogeneous sorption process. Furthermore, the thermodynamic studies revealed that the removal process was more spontaneous at a lower temperature, implying it an exothermic reaction. The synthesized adsorbent CMC-Mt can be widely used in the treatment of wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2018
·
IF 3.398
Bo Feng,Jinxiu Peng,Wei Guo,Guodong Luo,Wenpu Zhang,Huihui Wang
The separation of scheelite and calcite by froth flotation is difficulty as these two minerals have similar physicochemical characteristics. To solve this problem, the role of carboxymethyl chitosan in the flotation separation of scheelite from calcite has been studied and the depression mechanism has been discussed. Micro-flotation tests show that carboxymethyl chitosan has strong depression effect on calcite and the depression effect decreased with the increase of pH. However, its depression effect on scheelite is weak. A concentrate with WO 3 grade of 65.21% and WO 3 recovery of 77.48% can be achieved in the mixed minerals flotation when carboxymethyl chitosan was used. The adsorption tests show that carboxymethyl chitosan has adsorbed on the calcite surface and the adsorption amount increased with the increase of added amount. The adsorption mechanism of carboxymethyl chitosan on calcite surface was analyzed through the X-ray photoelectron spectroscopy (XPS) tests and the results revealed that carboxymethyl chitosan adsorbed on calcite surface mainly through chemical interaction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2018
·
IF 3.197
Tiantian Wu,Yuan Li,Ni Shen,Chunhong Yuan,Yaqin Hu
The objective of this study was to study the effect of calcium ions on the binding of lysozyme to chitosan (CS)/sodium alginate (SA) complexes (CS-SA-Ps), in order to develop a complex system for lysozyme delivery which might be of practical interest in the field of food preservatives . Result showed that with the increase of calcium ions (Ca 2+ ) concentration, the value of Z-Ave decreased while the value of ζ-potential and LE increased, where the addition of 5.0 mM Ca 2+ contributed to uniform distribution of the complexes. Sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) revealed that there was no significant difference of molecular integrity when lysozyme was released from CS-SA-Ps. The exothermic interaction between lysozyme and SA were proved by thermodynamic measurements, in which the binding stoichiometry showed a slight decrease in the presence of calcium chloride. Moreover, the release rate of lysozyme from CS-SA-Ps could be slowed by the increase of Ca 2+ addition concentration.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·6817-6823
·
IF 3.201
Zhenliang Li,Zunli Mo,Pengji Yan,Shujuan Meng,Ruijuan Wang,Xiaohui Niu,Nijun Liu,Ruibin Guo
Inspired by amino acids with amphoteric groups for electrochemical enantiorecognition, amphoteric chitosan (ACCS) was prepared with chloroacetic acid and CS, and has perfect solubility in alkaline and acid solution, compared with CS. ACCS was linked to the ethylenediamine-functionalized multiwalled carbon nanotubes (MWCNTs–EA) through covalent bonding. Chiral interfaces were fabricated with MWCNTs–EA–ACCS and used for the electrochemical enantiorecognition of phenylalanine (Phe) enantiomers. The ACCS chiral interfaces showed excellent selectivity toward the Phe enantiomers. Also, the optimization of parameters such as pH, temperature and response time was carried out for the electrochemical recognition. Furthermore, the ACCS is capable of determining the percentage of enantiomers in mixed solutions. The electrochemical recognition of amino acid enantiomers with different functional groups was investigated, and it was found that the amphoteric functional groups of ACCS play an important role in the enantioselective discrimination.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）