Polymers
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2020
·Vol. 12
·期 1
·158
·
IF 3.426
Yao Dou,Liguang Zhang,Buning Zhang,Ming He,Weimei Shi,Shiqing Yang,Yingde Cui,Guoqiang Yin
The development of edible films based on the natural biopolymer feather keratin (FK) from poultry feathers is of great interest to food packaging. Edible dialdehyde carboxymethyl cellulose (DCMC) crosslinked FK films plasticized with glycerol were prepared by a casting method. The effect of DCMC crosslinking on the microstructure, light transmission, aggregate structure, tensile properties, water resistance and water vapor barrier were investigated. The results indicated the formation of both covalent and hydrogen bonding between FK and DCMC to form amorphous FK/DCMC films with good UV-barrier properties and transmittance. However, with increasing DCMC content, a decrease in tensile strength of the FK films indicated that plasticization, induced by hydrophilic properties of the DCMC, partly offset the crosslinking effect. Reduction in the moisture content, solubility and water vapor permeability indicated that DCMC crosslinking slightly reduced the moisture sensitivity of the FK films. Thus, DCMC crosslinking increased the potential viability of the FK films for food packaging applications, offering a value-added product.Keywords:feather keratin;dialdehyde carboxymethyl cellulose;crosslinking;edible film
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PubMed
高影响因子
FOOD HYDROCOLLOIDS
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2020
·
IF 7.053
Hafiz Muhammad Ahsan,Ying Pei,Xiaogang Luo,Yixiang Wang,Yan Li,Bin Li,Shilin Liu
In order to increase the stability of the food foam system, microcrystalline cellulose (MCC) and chitosan (CHN) were used as stabilizer based on Pickering effect. The MCC/CHN colloidal particles had the initial morphology of MCC, the addition of CHN had an obvious influence on the surface zeta potential of the MCC, and it indicated that there was a strong interaction between MCC and CHN, which had been proved by using FTIR results. The MCC/CHN colloidal particles had typical shear thinning and elastic gel-like behaviors, and the Pickering emulsions stabilized by using the MCC/CHN colloidal particles also had the similar rheology properties. The pH had an obvious effect on the stability and emulsifying ability of the Pickering emulsions, and when the pH was near to 7.0, the emulsions had gelation behavior and there were inter-droplet interactions in the emulsion systems. For practical application, the solid foams were prepared from the Pickering emulsions at pH 7.0. The obtained foams had porous structure, and the molecular weight of the CHN had an influence on the strength of the foams, the energy absorption of the foams was increased from 17.66 kJ/m 3 to 32.86 KJ/m 3 with the increase of the molecular weight of the chitosan from 200 mPa s to 400 mPa s. The results indicated that MCC/CHN colloidal particles could be used to prepare food-grade solid foams through Pickering emulsions, which had great potential to produce safe, clean, and green products.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Meili Song,Houyong Yu,Jiaying Zhu,Zhaofeng Ouyang,Somia Yassin Hussain Abdalkarim,Kam Chiu Tam,Yingzhan Li
Self-healing conductive hydrogels as artificial skin-like materials hold great potential applications in the fields of artificial intelligence, soft robotics and personal healthcare. However, it remained challenging to construct stimuli-free self-healing biomimetic hydrogels with ultra-stretchability and excellent sensitivity. Herein, polyaniline (PANI) was coated on the surface polycarboxylic multi-branched cellulose nanocrystals (Multi CNC-PANI) via templated polymerization. Afterword, rod-like Multi CNC-PANI served as a dynamic bridge endowed those hydrogels hierarchical structure and dynamic hydrogen bond interactions doped with polyvinyl alcohol (PVA)/borax system. Combined with the dynamic borate ester bonds, the biomimetic nanocomposite hydrogels had high breaking strength (171.52 KPa), ultra-stretchability (1085%), rapid self-healing properties, adhesiveness, decent biocompatibility, and sensitivity. Especially, the hydrogels could keep good self-healing ability both in air and underwater without any stimuli, and the self-healing efficiency could reach up to 99.56% within 120 s. This hydrogel sensor could sensitively detect and distinguish human motions including swallow, fingers, wrist, elbow and knee joints, in real-time. Besides, the self-healed hydrogel gave detective signal with uniform and repeatable sensitivity, which endowed the hydrogels mechanically adaptability and good store stability. Therefore, the strategy may provide unique opportunities in designing biomimetic sensors with skin-like mechanical stretchability, sensitivity and self-healing properties.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Qiuqin Lin,Yuxiang Huang,Wenji Yu
In this study, two methods including a common method using high concentration of alkali solution and a mild extraction method at ambient conditions were used to extract cellulose from bamboo. The results showed that two methods affected the initial state of the cellulose. Celluloses obtained by the former was a hybrid of cellulose I and II while the latter was pure cellulose I. However, their heat treatment results indicated that the heat treatment (≤200 °C) would not change the aggregation structure of bamboo cellulose, but it will cause the change of intramolecular and intermolecular hydrogen bonds, and the break of glycosidic bonds in the amorphous region and part of the crystalline region of cellulose. Accordingly, the crystallinity of bamboo cellulose will decrease slightly after heat treatment. Finally, the macroscopic morphology change of bamboo cellulose caused by heat treatment was the thermal expansion in the width direction instead of distort.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 10
·5955-5970
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IF 4.21
Sun Lijian,Yang Shuaishuai,Qian Xueren,An Xianhui
Abstract In the current study, we introduce “click chemistry” as a powerful tool to tailor cyclodextrin–cellulose combination product followed by the inclusion of ciprofloxacin hydrochloride (CipHCl) as antibacterial agent. Initially, beta-cyclodextrin (β-CD) and cellulose fibers (CFs) were modified so as to be mono-6-propargylamino-6-deoxy-β-CD (Pro-β-CD) and azidated cellulose fibers (CFs-N 3 ), respectively. Afterward, the “click reaction” was carried out between Pro-β-CD and CFs-N 3 to fabricate a covalent grafting of β-CD onto CFs resulting in click product (CFs-N 3 @Pro-β-CD). The drug-delivery kinetics of the loaded CipHCl was performed by immersing samples into an aqueous solution, and the amount of adsorbed and released CipHCl was measured, as a function of time, by UV spectroscopy. Compared to original CFs, the load quantity of CipHCl into the click product was greatly increased, the release time of CipHCl from CFs-N 3 @Pro-β-CD was prolonged, and considerably higher antibacterial activity against E. coli and S. aureus was observed. The click product exhibited excellent antibacterial activity and sustained antibacterial efficacy up to 12 and 10 days against S. aureus and E. coli . The results showed that β-CD has been successfully grafted onto CFs via covalent bonds, while maintaining the intrinsic properties and the integrity of the fibers. Compared with the control paper sheet, the mechanical properties of the paper are well preserved. Graphic abstract
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·8843-8858
·
IF 4.21
Jiang Mengting,Zhang Yakang,Chen Jingwen,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
A series of morphology-controlled BiOBr nano/macrostructures was successfully synthesized via a novel biomass-route derived from bacterial cellulose (BC). In the BiOBr/BC system compared with pure BiOBr, the three-dimensional BC scaffolds not only effectively prevented the aggregation of BiOBr units by pore confinement, but also strengthened the controllability of BiOBr size with the help of abundant anchoring sites provided by cross-linked BC fibers. By associating the results of characterizations and the photodegradation of RhB dye, the relationship between morphology and photocatalytic activity of BiOBr/BC was investigated. In addition, a possible mechanism for the enhanced photocatalytic activity of the optimized BiOBr/BC has been discussed. This biomass-derived route provides a platform for further design of bismuth-based composite photocatalysts with potential advantages of being anti-aggregation, highly-dispersed, easily recovered and having enhanced catalytic performance.
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Materials Science & Engineering C-Materials for Biological Applications
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2020
·
IF 5.88
Yuanfeng Pan,Junren Liu,Kunni Yang,Pingxiong Cai,Huining Xiao
Nanogel based on polysaccharides has attracted the tremendous interest due to its unique performance as drug carrier for in vivo release. In this work, the multi-responsive nanogels were developed based on the tailor-modified sugarcane bagasse cellulose (SBC). In the presence of crosslinking agent cystamine bisacrylamide (CBA), the in-situ free radical copolymerization of methacrylated monocarboxylic sugarcane bagasse cellulose (MAMC-SBC) and N-isopropylacrylamide (NIPAM) in aqueous phase was conducted, thus leading to redox, pH and thermal-responsive nanogels. The results obtained from FT-IR, SEM and particle sizer showed that the nanogels were highly stable with the desired particle size ranging from 90 to 180 nm and contained targeted polymeric segments and linkage for multi-responsivity. Doxorubicin hydrochloride (DOX) as a model drug was effectively loaded into the nanogels, partly driven by strong electrostatic association; and the loading efficiency reached up to 82.7%. Moreover, the drug release could be readily manipulated by the addition of reducing agent, pH and temperature, which is attributed to the multi-responsive behavior of nanogels as carrier and synergetic effects. The performance of nanogels was also governed by the ratio of reactive MAMC-SBC and NIPAM during polymerization; and the ratio at 1:1(wt) led to the optimal structure of nanogels.
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高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 7
·1550-1559
·
IF 1.797
Mahmud Sakil,Long Yu,Abu Taher Muhammad,Hu Han,Zhang Ruoyu,Zhu Jin
Poly(butylene 2,5-furandicarboxylate) (PBF) derived from 2,5-furandicarboxylic acid (FDCA) is an emerging bio-based alipharomatic polyester that is expected to replace its fossil-based terephthalate and naphthate homologues. PBF holds excellent gas barrier properties, but its slow rate of crystallization might restrict wider applications. To improve the rate of crystalization, it was melt-blended with crystalline micro-cellulose (CMC) to prepare a composite through twin-screw extrusion. To ensure environmental friendly conditions, neither chemicals to modify fibers nor compatibilizers to improve the filler/matrix interaction were used. Size exclusion chromatography (SEC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD) were used to characterize the composite. It was observed that a longer blending duration (cyclic mode) leads to a greater reduction in molecular weight (Mw) in the presence of CMC, which can be avoided by using a shorter blending duration (direct mode). The mechanical properties of the composite showed an increase in Young’s modulus by approximately 23 % and 36 % with respect to reference PBF for the cyclic and direct mode respectively. It was further observed that, although the elongation at break and tensile strength has decreased, it has improved gas barrier properties. Thermal analysis shows faster nucleation of PBF in the presence of CMC with a minor effect on its thermal degradation.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yuting Liang,Hongxiang Zhu,Lei Wang,Hui He,Shuangfei Wang
Biocompatible smart dual-responsive cellulose nanofibres were designed and prepared by grafting a temperature and pH dual-responsive polymer (PEI-NIPAM: polyethyleneimine– N -isopropylacrylamide) on cellulose nanofibres (CNF-COOH). The smart cellulose nanofibres showed good antibacterial activity (above 99%) against Escherichia coli and excellent biocompatibility based on acute systemic toxicity, in vitro cytotoxicity, skin irritation, and skin sensitisation analyses. CNF-PEI-NIPAM showed an excellent dual-response performance to pH and temperature, affording the CNF-PEI-NIPAM aerogel with a high loading capacity (330.12 mg/g) for doxorubicin and a high cumulative release rate (59.45 %) at 37 °C and pH 3. These advantages enable the smart cellulose nanofibres to be applied in the fields of food and biomedicine. Interestingly, the interaction between the collapse and expansion of the dual-responsive polymer molecular chains on the CNF-COOH was revealed based on in situ characterisation of the solid materials, which is valuable for the structural design and application of cellulose-based dual-responsive smart nanofibres.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 13
·7591-7605
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IF 4.21
Wang Haiyong,Hu Xiaohong,Liu Siwei,Cai Chiliu,Zhu Changhui,Xin Haosheng,Xiu Zhongxun,Wang Chenguang,Liu Qiying,Zhang Qi,Zhang Xinghua,Ma Longlong
The bi-functional Ni–W@C catalysts were prepared by one-pot reduction–carbonization method and used in hydrogenolysis of cellulose as well as raw lignocellulosic biomass to chemicals. The catalytic performance for cellulose conversion showed that it was more favorable for ethylene glycol (EG) production, obtaining the highest EG yield 60.1% over the Ni–W@C 700 catalyst. The Ni–W@C bimetallic catalysts are systematically characterized with BET, XRD, Raman, XPS, TEM techniques and experiments to probe the active catalytic sites of the catalysts. The effects of calcination temperature of Ni–W catalysts, reaction time, temperature and H 2 pressure on cellulose hydrogenolysis were investigated in detail. The Ni particles could lead to produce more W 5+ active sites, which promotes the glucose retro-aldol condensation to break the target C–C bonds. Metallic Ni catalyzed C=O hydrogenation and C–C hydrogenolysis, which could also avoid the coke formation. The EG selectivity was dependent on the synergy of WO x and Ni metal sites. In addition, this synergistic effect between the metal and WO x could promote lignin component degradation in direct conversion of untreated raw lignocellulosic biomass, obtaining the propyl monophenolics including guaiacylpropane, syringylpropane and p-n-propylphenol with a total yield of 17.3 wt% besides EG.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Somia Yassin Hussain Abdalkarim,Yanyan Wang,Hou-Yong Yu,Zhaofeng Ouyang,Rabie A.M. Asad,Mengya Mu,Yujun Lu,Juming Yao,Lianyang Zhang
In this work, cellulose nanocrystals (CNCs) incorporated with supermagnetic iron oxide nanoparticles (Fe 3 O 4 NPs) as ( M CNC) hybrids by the co-precipitation method have developed. High-performance nanocomposite films consisting of poly(3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) and M CNC hybrids have prepared through a simple solution casting method. The addition of CNCs in M CNC-5% hybrids improved the surface hydrophilicity of PHBV, and displayed a reduction in water vapor permeability by 68.1 %, compared with pristine PHBV. The results prove that the addition of M CNC hybrids can be acted like a sensor to detect voltage change of the nanocomposites as functions of water vapor. The existence of CNCs in the M CNC-5% hybrids caused an increase in tensile strength and Young’s modulus by 74.6 % and 120.2 %, respectively. The addition of CNCs could enhance cell-matrix interactions and thus cytocompatibility of PHBV nanocomposites. The PHBV/ M CNC-5% exhibited saturation magnetization (Ms) values of 1.5 emu g −1 and displayed almost a regular and operative voltage response signal with real-time monitoring of water vapor. This work provides sustainable smart packaging materials with high sensitivity for water vapor and excellent biocompatibility.
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高影响因子
Biomass Conversion and Biorefinery
·
2020
·Vol. 12
·期 9
·3933-3942
·
IF 2.602
Xu Lu,Wang Aili,Li Siqiang,Zhang Liya,Pan Ruiyu,Guo Peng,Yi Ming,Liu Jie
Biomass residue cellulose-based poly-(ionic liquid)s (ILs) were in situ synthesized via activators generated by electron transfer for atom transfer radical polymerization in ionic liquid microemulsions. These biomass residues, including apple residue, citrus residue, and ginkgo leaf, were started with pretreatment and modification in ionic liquid microemulsions, and their structure and thermal stability were significantly altered before and after modification as confirmed by scanning electron microscopy and thermogravimetric analysis. Fourier-transform infrared spectroscopy and 31 P nuclear magnetic resonance spectroscopy were used to investigate the molecular structure of the biomass residue cellulose-based poly-ILs. In addition, the adsorption performance of the biomass residue cellulose-based poly-IL adsorbents for heavy metal ions, such as Cd(II), Zn(II), Cr(IV), Cu(II), Mn(II), Ni(II), and Pb(II), in water were investigated. Results show that the prepared adsorbent possesses good thermal stability and certain adsorption capacity for metal ions in water, especially for nickel ions (93.91 mg/g). The prepared adsorbent also exhibits remarkable performance in the field of biomass residue utilization and novel poly-IL adsorbents.
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危险品化学品经营许可证（带存储）