INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Hong Zhang,A.M. Omer,Zhaohong Hu,Li-Ye Yang,Chao Ji,Xiao-kun Ouyang
In this work, composite hydrogel beads based on magnetic bentonite/carboxymethyl chitosan/sodium alginate (Mag-Ben/CCS/Alg) were fabricated and their ability to adsorb copper ions in water was studied. The structure and properties of the composite were characterized via SEM, FTIR, XPS, TGA , VSM, and Zeta potential tests. The effects of the adsorbent dosage, adsorption time, pH, temperature, and initial concentration of Cu(II) on the adsorption results were studied. The results showed that Mag-Ben/CCS/Alg reached equilibrium after 90 min of adsorption, the removal rate of Cu(II) was 92.62 ± 0.39%, and the maximum adsorption capacity was 56.79 mg/g (30 °C). The removal rate of Cu(II) by Mag-Ben/CCS/Alg still remained above 80% after recycling four times. The adsorption process of Cu(II) by Mag-Ben/CCS/Alg occurred in accordance with the quasi-second-order kinetic model and Langmuir adsorption isotherm. The adsorption process was spontaneous and endothermic.
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高影响因子
NANO
·
2019
·
IF 1.293
Mengmeng Zhang,Yamin Cheng,Zhiwei Li,Xiaohong Li,Laigui Yu,Zhijun Zhang
An inorganic–organic nanohybrid flame retardant, HNT@CS@Fe 3 O 4 , is prepared by Halloysite nanotubes (HNT) as nanotemplate, chitosan (CS) as char-forming agent and ferroferric oxide (Fe 3 O 4 ) playing in a catalytic role, aiming to endow enhanced flame-retardant performance of its nanohybrid. Results show that HNT@CS@Fe 3 O 4 nanohybrids have a corn-like structure and can significantly improve the flame retardancy and thermal stability of epoxy resin (EP). Especially, the initial thermal degradation temperature of EP/HNT@CS@Fe 3 O 4 is significantly improved by 2 4 ∘ C relative to pure EP, and the residual carbon yield under air atmosphere is 8.8 wt.%, which is significantly higher than other EP composites, indicating a higher thermal stability is offered by the as-prepared nanohybrid. The limiting oxygen index of EP/10HNT@CS@Fe 3 O 4 is 31.3%, which is 10.2% higher than that of pure EP. Meanwhile, the HNT@CS@Fe 3 O 4 nanofiller reduces the peak heat release rate, CO production and peak smoke production release of EP nanocomposite by 32.0%, 44.0% and 33.0% in a cone calorimeter test, respectively. This is because the HNT-based composite can form a three-dimensional network structure into the EP matrix to inhibit heat release and diffusion of flammable moieties upon burning of EP. In the meantime, the incorporated Fe 3 O 4 nanoparticle can in situ catalyze the charring of CS and EP matrix on the surface of HNT during the combustion process, which also contributes to the significantly increased fire safety of EP.
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ACS Omega
·
2019
·
IF 2.584
Yanping Huang,Nianhua Dan,Weihua Dan,Weifeng Zhao
A novel clay-reinforced polycaprolactone/chitosan/curcumin (PCl/CS/Clay/Cur) composite film was fabricated in this study. The prepared Cur-loading composite films were characterized with attenuated total reflection Fourier transformed infrared spectroscopy, scanning electron microscopy, atomic force microscopy, water contact angle, differential scanning calorimetry, thermogravimetric analysis, and X-ray diffraction, and the results showed good dispersion of clay in the composite films. The addition of nanoclay was found to significantly increase the tensile strength. Also, the clay-enhanced drug-loading films exhibited better controlled-release profiles of Cur than those membranes without clay. Skin disinfection test demonstrated that the curcumin-loaded film could protect wound from bacterial infection. Cytotoxicity analysis proved the good biocompatibility of the composite films. The clay-enhanced Cur-loading films might be promising candidates for wound care.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Pengfei Zou,Wen-Hui Lee,Zhiqin Gao,Di Qin,Yuxia Wang,Jiao Liu,Tongyi Sun,Yuanyuan Gao
Novel nanomaterials have been developed for antimicrobial and wound healing applications. Here, we report the preparation of a polyvinyl alcohol/chitosan (PVA/CS) nanofiber with carboxymethyl chitosan nanoparticles (CMCS-OH30 NPs) encapsulating the antibacterial peptide OH-CATH30 (OH-30). The PVA/CS nanofibers containing OH-30 NPs (NP-30-NFs) obtained via electrospinning could achieve a secondary embedded OH-30. The effect of NP-30-NFs on the release of OH-30 was investigated through high-performance liquid chromatography. The antibacterial activities of NP-30-NFs against Escherichia coli and Staphylococcus aureus were studied by bacterial plate counting. NP-30-NFs containing different concentrations of NPs were applied to mouse skin wounds to determine their effectiveness in promoting wound healing. Results showed that NP-30-NFs exhibited antibacterial properties and promoted skin wound healing.
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高影响因子
Applied Materials Today
·
2018
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IF 0
Lei Liu,Yingcong He,Xuetao Shi,Huichang Gao,Yingjun Wang,Zhengmei Lin
By mimicking the role of phosphate groups in native tissues and encouraging tissue formation, phosphate-functionalized biopolymers have been widely employed to accelerate the formation of bone injury. In this study, phosphocreatine is screened as a phosphate source and applied in the preparation of phosphocreatine-modified chitosan (CS-P) and porous scaffolds. CS-P exhibits much better hydrophilicity, solubility, protein adsorption and mineralization than pure chitosan (CS). Meanwhile, in comparison to CS scaffold, the CS-P scaffold significantly enhances the in vitro osteogenic differentiation of hFOB cells, indicated by the higher alkaline phosphatase (ALP) activity, denser mineralization deposition and up-regulated osteogenesis-related genes including runt-related transcription factor-2, ALP, osteocalcin and osteopontin at both mRNA and protein levels. The in vivo results indicate an enhancing effect of the CS-HP scaffold on the bone regeneration ability. We further confirm that phosphocreatine modification promotes the osteogenic differentiation of hFOB cells by activating the MAPK signalling pathway. The phosphocreatine-modified chitosan holds great potential for bone repair and regeneration.
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RSC Advances
·
2018
·Vol. 8
·期 25
·13656-13663
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IF 2.936
Yangyang Wei,Jian Wang,Hao Li,Man Zhao,Huifeng Zhang,Yipeng Guan,Hai Huang,Baoxia Mi,Yushan Zhang
A tremendous quantity of brackish water with a high proportion of divalent cations is in great need of water softening. Layer-stacked graphene oxide membranes show potential in membrane processing due to their molecular sieving properties, but show poor selective retention of cations due to unstable interlayer spacing and electrostatic interaction. In this study, a partially reduced graphene oxide (prGO) and chitosan (CS) nanohybrid membrane (prGO–CS) was fabricated to achieve the selective retention of divalent cations by adjusting the configuration and controlling the surface charge. The prGO–CS membrane, which included a CS skin and embedded prGO sheets, showed a performance boost of 98.0% rejection of Mg2+ and 95.5% rejection of Ca2+ when compared with a CS membrane. The membrane showed good water softening performance for brackish water under low operation pressure with a high Na+/Mg2+ selectivity of 33.8. The excellent performance was attributed to the dense structure and positive charge of prGO–CS.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Lili Chen,Yuanyuan Zheng,Longbao Feng,Zonghua Liu,Rui Guo,Yuanming Zhang
The aim of this work was to examine the formation and properties of a novel polyelectrolyte complex of drug carrier system for the delivery of doxorubicin (DOX), which consists of hyaluronic acid (HA) coated hydrophobically modified chitosan (CS). Various batches of polyelectrolyte complexes with the molar ratio of deoxycholic acid (DCA) and chitosan (CS) of 0.1, 0.2, 0.3 were prepared, and were termed as CS-DCA 10 , CS-DCA 20 , and CS-DCA 30 respectively. The samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Transmission electron microscopy (TEM), nuclear magnetic resonance hydrogen spectrum ( 1 H NMR) and dynamic light scattering (DLS). Particle sizes of synthesized polyelectrolyte complex nanoparticles (PCNs) were found to be in the range of 280–310 nm, larger than those of uncoated nanoparticles (~150 nm). The PCNs have large zeta potentials (about 26 mV) which make them stable and no sizes' change was determined. DOX could be easily incorporated into the PCNs with encapsulation efficiency (56%) and kept a sustained release manner without burst effect when exposed to PBS (pH 7.4) at 37 °C. Overall, these findings confirmed the potential of these PCNs for drug carrier and prolonged and sustained delivery in the bloodstream.
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高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Pierre Dramou,Meriem Fizir,Abdoh Taleb,Asma Itatahine,Nasiru Sintali Dahiru,Yamina Ait Mehdi,Liu Wei,Jingyi Zhang,Hua He
In this research, to achieve enhanced intracellular uptake of anticancer drug carriers for efficient chemotherapy, folic acid conjugated chitosan oligosaccharides assembled magnetic halloysite nanotubes (FA-COS/MHNTs) have been tailored as multitask drug delivery system towards camptothecin (CPT). Besides magnetic targeting, the nanocomposites have been reacted with folate complex in order to selectively target cancer cells over expressing the folic acid receptor. HNTs showed to have a high storage capacity of CPT. In vitro, the release results indicated that CPT outflow from the nanocarriers at pH 5 was much greater than that at both pH 6.8 and 7.4. MTT assays showed that the CPT-loaded nanocarriers exhibited stronger cell growth inhibitory against colon cancer cell. Furthermore, nanocarriers gained specificity to target cancer cells because of the enhanced cell uptake mediated by FA moiety and presence of COS. Therefore, the rational designed HNTs nanocarrier for chemotherapy drug showed great potential as tumor-targeted drug delivery carrier.
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BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Chaofan Zheng,Huaili Zheng,Yongjuan Wang,Yili Wang,Wenqi Qu,Qiang An,Yongzhi Liu
Novel adsorbents, poly([2-(methacryloxy)ethyl]trimethylammonium chloride) modified magnetic chitosan particles (DMCPs), were synthesized via free radical polymerization and applied to adsorb Cr(VI) from aqueous solution. The effects of pH (2–11), Cr(VI) concentration (10–200 mg/L) and contact time (0–420 min) on the adsorption performance were evaluated. The results showed that the adsorption capacity of DMCPs was much larger than that of magnetic chitosan particles (MCPs) in the examined pH range and decreased with Cl − concentration increasing, indicating that electrostatic interaction and ion exchange are the governing mechanisms of Cr(VI) adsorption by DMCPs. The Langmuir isotherm model and pseudo-second-order kinetic model fitted the experimental data well. The maximum adsorption capacity of DMCPs is 153.85 mg/g. Besides, Cr(VI)-loaded DMCPs could be easily separated and efficiently regenerated. Therefore, DMCPs are promising candidates for Cr(VI) adsorption owing to their excellent performance in a wide pH range, easy separation and good reusability.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
Xiaoyi Yang,Binbin Zhang,Ping Li,Chaohua Guo,Jianbo Li,Xingang Wang
The present work aimed at research the physic-chemical properties of the interaction of N-decyl-O-chitosan sulfate (an amphiphilic chitosan derivative, C10-OCHS) with cetyltrimetylammonium bromide (CTAB) by the steady-state fluorescent, static/dynamic surface tension, turbidity and transmission electron microscopy (TEM). The results showed that the complex of C10-OCHS/CTAB had high surface activity and lower critical aggregation concentration. Besides, the C10-OCHS/CTAB could self-assemble into various aggregates like irregular spherical aggregates, vesicles or polydisperse aggregates from lower to higher concentrations of CTAB with a mixed C10-OCHS concentration of 200 mg/L.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Kexin Wang,Hui Ma,Shengyan Pu,Chun Yan,Miaoting Wang,Jing Yu,Xiaoke Wang,Wei Chu,Anatoly Zinchenko
Easy-to-obtain magnetic bentonite-chitosan hybrid beads (Bn-CTS) were prepared by immobilizing bentonite within a porous structure of chitosan beads to achieve a hybrid adsorption effect for the removal of cesium ion (Cs + ) from water. The hybrid adsorbent, which had a porous structure and abundant binding sites contributed by both chitosan and bentonite, ensured superb adsorption characteristics. The paramagnetic character of the beads enabled their facile separation for recycling. The chitosan/bentonite ratio, pH and contact time were optimized to achieve the optimal Cs + efficiency, and the adsorption kinetics and isotherms were thoroughly discussed. The adsorption kinetics obeyed the pseudo-second-order model, and the best fitted equation for equilibrium data was the Langmuir isotherm model. The maximum adsorption capacity of the bentonite-chitosan beads was 57.1 mg g −1 . The adsorbent had excellent selectivity towards Cs + adsorption in the presence of abundant cations (Li + , Na + , K + and Mg 2+ ). The adsorbent was able to be recycled by treating the beads with 0.1 mol L −1 of MgCl 2 to quantitatively desorb Cs + from the beads. Overall, the magnetic bentonite-chitosan beads can be used as a highly efficient adsorbent for radioactive waste disposal and management.
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高影响因子
Materials
·
2018
·Vol. 11
·期 10
·1881
·
IF 2.467
Jingrong Hu,Wangwei Liu,Huiling Liu,Lamei Wu,Huijuan Zhang
Magnetic dodecyl chitosan/silica composite was synthesized and characterized for the enrichment of emerging bisphenol contaminants. The result demonstrated that bispehnol A, bisphenol AF, bisphenol F, and bisphenol S can be efficiently extracted via the resulting composite from aqueous solution. The adsorption rate of four investigated bisphenols on the resulting composite was achieved in the range of 87–99% within 15 min. Bispehnol A was taken as a representative adsorbate to investigate the adsorption studies in detail. The hydrophobic interaction was proposed as the principal mechanism for the adsorption of BPs. The satisfactory reusability of the resulting composite can be quickly achieved by magnetic separation technologies. Magnetic dodecyl chitosan/silica composite has a potential to be applied as a type of efficient and easily recyclable sorbent for the removal of trace organic pollutants from aqueous sample.Keywords:magnetic dodecyl chitosan/silica composite;bisphenols;enrichment
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