CARBOHYDRATE POLYMERS
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2021
·
IF 9.381
Chunling Nie,Ting Shen,Weicheng Hu,Qin Ma,Jiahui Zhang,Shuqian Hu,Huafeng Tian,Hao Wu,Xiaogang Luo,Jianguo Wang
In recent years, harmful microorganisms in water pose great harm to ecological environment and human health. To solve this problem, epsilon-poly- l -lysine (EPL) grafted cellulose beads were prepared via 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO) mediated oxidation and carbodiimide mediated cross-linking reaction. Hydroxyl groups on C6 of cellulose were oxidized to carboxyl groups by TEMPO and grafting reaction was achieved between newly formed carboxyl groups of cellulose and amino of EPL. The beads were characterized by FTIR, SEM, XRD and TGA. The crystalline form of cellulose transformed from cellulose I to cellulose II after being dissolved and regenerated. The grafted cellulose beads showed good antibacterial activities against Gram-negative Escherichia coli , Gram-positive Staphylococcus aureus and Alicyclobacillus acidoterrestris with 10 h. The beads could be biodegraded in soil after 28 days. It is expected that the bio-based composite beads could have potential applications in water purification and food treatment fields.
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ACS Nano
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2021
·
IF 15.881
Fei-Fei Chen,Zi-Hao Dai,Ya-Nan Feng,Zhi-Chao Xiong,Ying-Jie Zhu,Yan Yu
Cellulose fiber (CF) paper is a low-cost, sustainable, and flexible substrate, which has gained increasing interest recently. Before practical usage, the functionalization of the pristine CF paper is indispensable to meet requirements of specific applications. Different from conventional surface modification or physical mixing methods, we report in situ growth of ultralong hydroxyapatite nanowires (HAPNWs) with lengths larger than 10 μm on the CF paper. HAPNWs are radially aligned on the surface of CFs, creating a micro/nanoscale hierarchical structure. By means of the excellent ion exchange ability of HAP and the hierarchical structure, the functions of the CF paper can be easily customized. As a proof-of-concept, we demonstrate two kinds of functional CF paper: (1) the photoluminescent CF paper by doping Eu3+ and Tb3+ ions into the crystal lattice of HAPNWs and (2) the superhydrophobic CF paper by coating poly(dimethylsiloxane) on the HAPNW hierarchical structure, which can be applied for self-cleaning and oil/water separation. It is expected that an in situ growth of ultralong HAPNWs will provide an instructive guideline for designing a CF paper with specific functions.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yunhao Gao,Yu Liu,Xueyin Qin,Ziping Guo,Donglin Li,Chenggang Li,Hu Wan,Fuxing Zhu,Jianhong Li,Zhuo Zhang,Shun He
The controlled release of pesticides based on nanoparticle platforms has emerged as a new technology for increasing the efficiency of pesticides and for reducing environmental pollution because of their size-dependent and target-modifying properties. In the present study, pH/cellulase dual stimuli-responsive controlled-release formulations (PYR-HMS-HPC) were designed by grafting hydroxypropyl cellulose onto pyraclostrobin-loaded hollow mesoporous silica nanoparticles via an ester linkage. The PYR-HMS-HPC formulations were characterized by Fourier transform infrared spectroscopy , thermogravimetric analyzer, transmission electron microscope and scanning electron microscope. The results demonstrated that PYR-HMS-HPC with a loading capacity of 12.1 wt% showed excellent pyraclostrobin release behaviors in response to acidic environments and the introduction of cellulase, could effectively prevented pyraclostrobin from photolysis. Compared with commercial pyraclostrobin formulations, the PYR-HMS-HPC formulations showed much stronger and statistically significant fungicidal activity against Magnaporthe oryzae from 7 to 21 days. Furthermore, the Allium cepa chromosome aberration assay demonstrated that the PYR-HMS-HPC formulations reduced the genotoxicity of pyraclostrobin. These pH/cellulase dual stimuli-responsive controlled-release formulations are of great interest for sustainable on-demand crop disease protection.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 6
·2352-2366
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IF 3.665
Feng-Jiao Li,Xi-Tong Yu,Zan Huang,Ding-Fu Liu
Grafting of polylactide (PLA) onto the cellulose nanofiber (CNF) (CNF-g-PLA) was prepared by in situ reactive extrusion using dicumyl peroxide (DCP) as a free radical initiator to improve the interfacial adhesion between CNFs and PLA. The effect of DCP content on the dynamic rheological properties, crystallization behavior, mechanical properties, and micromorphology of PLA/CNF (95/5) bionanocomposite was systematically investigated. FTIR spectra confirmed that PLA chains were successfully grafted onto the CNF surface by forming C C bonds. The presence of such C C crosslinks improved stress transfer at the CNF–PLA interface; SEM and TEM observations and adhesion factor calculated from DMA data confirmed that the synthesized graft copolymers improved the interfacial interaction between CNFs and PLA matrix, thus enhancing the mechanical properties of CNF-g-PLA nanocomposites. Compared with PLA/CNF (95/5) bionanocomposite, the maximum tensile modulus, tensile strength, elongation at break, and V-notched Izod impact strength of CNF-g-PLA nanocomposites were increased by 31.8%, 20.0%, 12.0%, and 27.9%, respectively. WAXD and DSC analyses indicated that the crystallinity degree of the grafted CNF-g-PLA was higher than that of PLA/CNF (95/5) bionanocomposite, and first increased and then decreased with increasing DCP content. The polarized optical micrographs confirmed that DCP-initiated grafting significantly increased the nucleation density but decreased the spherulite size of PLA. The melt strength of CNF-g-PLA nanocomposites was improved due to stronger intermolecular interaction by grafting. This one-step in situ reactive extrusion technology provides an efficient and economical way to enhance the properties of PLA/CNF bionanocomposites.
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CELLULOSE
·
2021
·Vol. 28
·期 6
·3515-3529
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IF 5.044
Zhang Mingzhu,Li Meng,Yu Ningya,Su Shengpei,Zhang Xiaomin
A series of tannic acid (TA)-modified cellulose hydrogels embedded size-controlled AgCl nanoparticles (AgCl@TA x -cellulose hydrogels) were fabricated successfully via a one-step method. The size of AgCl nanoparticles in the TA-cellulose hydrogels could be adjusted expediently by varying the TA content. With the increase of TA content, the size of AgCl nanoparticles initially decreased and reached the minimum size of 5.5 nm at 5% TA content and then increased dramatically. The hydrogels with the smallest AgCl nanoparticles exhibited excellent catalytic activity in NaBH 4 -mediated reduction of 4-nitrophenol (4-NP); the reaction rate constant was as high as 1.383 min −1 . It should be noted that NaBH 4 played a double role in the reduction of 4-NP presented here, i.e., in-situ reduction of AgCl to Ag nanoparticles and successive reduction of 4-NP over the resultant Ag@TA x -cellulose hydrogels. In such a way, the strategy of “catalysis along with reduction” provided a novel path for catalytic systems involving noble metal catalysts. Also, the above AgCl@TA x -cellulose hydrogels exhibited good catalytic activity for NaBH 4 -mediated reduction of various organic dyes following the procedure of “catalysis along with reduction”.
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Food Biophysics
·
2021
·Vol. 16
·期 4
·460-473
·
IF 3.114
Zhang Xiuling,Li Zhen,Ji Run,Li Kun,Zhang Wentao
Biodegradable composite films based on pullulan/carboxymethyl cellulose/nano-TiO 2 were prepared using a solution casting method. In this study, the composite films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), and their physical, mechanical and antimicrobial properties were investigated. FTIR and XRD results confirmed that the presence of nano-TiO 2 could enhance the interaction between the film matrix. SEM analysis revealed that the composite films had a homogeneous network structure, and good particle dispersion could be obtained when the nano-TiO 2 particle content was low. DSC results indicated that the composite films possessed good thermal stability. The incorporation of nano-TiO 2 increased the thickness and contact angle while significantly decreasing the water solubility ( p < 0.05). As the content of nano-TiO 2 increased, the water vapor and ultraviolet visible (UV–Vis) light barrier properties of composite films were significantly improved ( p < 0.05). Mechanical analysis demonstrated that the tensile strength of the composite films first increased and then decreased, whereas the elongation at break decreased significantly ( p < 0.05). In addition, the composite films exhibited excellent activity against Escherichia coli and Staphylococcus aureus mainly due to the inactivation of bacteria by nano-TiO 2 photocatalysis. Preservation experiments showed that the composite films could decrease the weight loss significantly and maintain the firmness, titratable acidity, vitamin c and skin color of strawberries, thereby improving the overall quality of strawberries and extending their shelf life. This finding suggested that pullulan/carboxymethyl cellulose/nano-TiO 2 composite films possessed excellent potential for application in food packaging.
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RSC Advances
·
2021
·Vol. 11
·期 40
·24694-24701
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IF 3.361
Xiaozheng Sun,Yanhua Xue,Jianye Li,Yu Yang,Yu Bai,Yujia Chen
High-performance fluorescent composites are key to the development and improvement of fluorescent molecular probe technology. In this study, cellulose nanocrystals (CNC) with high carboxyl concentrations were prepared via sequential periodate–chlorite oxidation. Then, fluorescent cellulose nanocrystals (FCNC) were prepared by attaching 7-amino-4-methylcoumarin (AMC) onto CNC under 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMTMM) catalysis. The morphology and fluorescence properties of FCNC were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, elemental analysis, ultraviolet-visible absorbance, fluorescence spectrophotometry, and fluorescence spectroscopy. The results showed that AMC was grafted onto the CNC surface by an amidation reaction, and the absorption and emission maxima for FCNC were blue-shifted from 350 nm and 445 nm of AMC to 335 nm and 440 nm, respectively. FCNC retained the crystallinity and nano-topography size of the CNC. The fluorescence intensity, quantum yield, and fluorescence lifetime of FCNC showed the same change law; it first increased and then decreased with an increase in the graft density of AMC from 0.201 to 0.453 AMC molecules per nm2. The FCNC prepared in this study have good optical properties and can be used in the fields of fluorescent molecular probes and biological imaging.
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COMPOSITES PART B-ENGINEERING
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2021
·
IF 9.078
Jiaming Sun,Zhenwei Wu,Bang An,Chunhui Ma,Lifei Xu,Zhanshuo Zhang,Sha Luo,Wei Li,Shouxin Liu
Inspired by the tubular structures found in naturally occurring thermal-insulating materials, tubular cellulose aerogels with improved mechanical resistant, thermal-insulating and flame-retardant properties were prepared from kapok fibers via a facile process. In contrast to fragileness of traditional organic-inorganic composites, an optimized sample exhibited an ultra-high compressive strength of 32 MPa. The tubular structure of this material resulted in a 37.4 °C increase in heat preservation compared with that obtained from a pulp aerogel without this morphology. The H 3 PO 4 decomposed from (NH 4 ) 2 HPO 4 in the formulation crosslinked the outermost cellulose fibers to generate a clay-reinforced dense carbon layer in conjunction with montmorillonite , which restricted the movement of flames and the outflow of volatile compounds. The gaseous voids of internal tubular fibers interrupted the heat transport pathways to inhibit thermal transmission and trapped combustible volatiles to reduce the penetration pressure experienced by the dense carbon layer greatly. The combined effects of the carbon layer and tubular structure effectively limited the transfer of heat, oxygen and volatiles, leading to non-combustion of the optimal sample. This study provided a cost-effective and facile approach to prepare of thermal-insulating, fire-safe and high-strength aerogel showing promising applications in exterior wall insulation and vehicle interior.
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LUMINESCENCE
·
2021
·Vol. 36
·期 6
·1459-1468
·
IF 2.464
Shiyan Lu,Guangzhi Yuan,Yongfei Zhu,Shujuan Yu
For environmental protection, organic dyes and solvents of industrial wastewater must be eliminated. Here, a citric acid-based carbon dots (CA-CDs) crosslinked chitosan/microcrystalline cellulose (CS/MCC/CA-CDs) sponge was synthesized to study its adsorption performance for methyl blue (MB) dye. The morphology of the sponge was a tangled fibre with a bundle formed by hydrogen bonds between CA-CDs and the CS/MCC composite matrix. The abundant amount of tangled fibre bundle units can offer plentiful active adsorption sites to collect the dye molecules. The adsorption capacity of the CS/MCC/CA-CDs sponge toward MB was 306.8 mg/g at pH 10 and a temperature of 298 K. In addition, the pseudo-second-order kinetic model was matched with the adsorption kinetic experimental data, and the adsorption isotherm data can be described by the Langmuir models. This study proposed that the CS/MCC/CA-CDs sponge adsorbent creates tremendous potential application value in wastewater treatment due to its fast kinetics, high adsorption capacity, simple preparation, and eco-friendly properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Guihua Yang,Yuanyuan Xia,Zhaoyun Lin,Kai Zhang,Pedram Fatehi,Jiachuan Chen
A cellulose nanocrystal based oxidation system is developed for oxidizing starch in the presence of NaClO, and provides an alternative and green method to improve the oxidizing degree of oxidized starch. The underlying mechanism for the oxidation was studied with confocal laser scanning microscopy . It was found that cellulose nanocrystal would penetrate into the starch microparticles and contribute to oxidation. The function of cellulose nanocrystal on the physicochemical properties of oxidized starch was investigated. With the incorporation of the oxidized starch into starch/polyvinyl alcohol/glyceryl composite films, the mechanical property and transparency of the films improved substantially. The highest oxidation level of starch was attained at 0.5 wt% cellulose nanocrystal dosage and the carboxylate content was 1.10%, the composite film showed the maximum transparency of 0.66 and highest contact angle of 102.0°. Meanwhile, the best film was obtained with oxidized starch containing 1.0 wt% cellulose nanocrystal. Compared to native starch and TEMPO-oxidated starch, the cellulose nanocrystal-based oxidized starch improved the hydrophobicity of film more substanially. In conclusion, cellulose nanocrystal acts as prooxidant and reforcing agent in this starch-based composite film, which makes them promising materials in the preparation of novel composite materials.
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TALANTA
·
2021
·
IF 6.057
Qianying Sheng,Junyan Li,Yingxin Chen,Xinmiao Liang,Minbo Lan
Glycosylation is one of the most important post-translational modifications of proteins, and plays an important role in the structure and function of proteins. However, due to the diversity of glycopeptide forms and their low abundance, it is extraordinarily challenging to capture and separate glycopeptides with high selectivity from complex biological samples with mass spectrometric analysis. Here, we synthesized a new type of hydrophilic composite based on electrostatic interactions , which has been proven to be effective in immobilizing cationic cellulose on graphene oxide-dopamine carriers (expressed as GO-DA-JR), for highly specific enrichment of N-glycopeptides. The introduction of cationic cellulose provides not only a perfect surface charge for the composite but also a greater ability to enrich glycosylated peptides. Thirty-two glycopeptides from human serum immunoglobulin G (IgG) tryptic digests were observed with a greatly improved signal-to-noise ratio (S/N) and also presented high performance in anti-interfering enrichment of glycopeptides from complex samples containing 100-fold bovine serum albumin tryptic digests. In addition, GO–DA-JR has higher sensitivity (1 fmol/μL IgG) and better enrichment capacity (up to 150 mg/g). Moreover, the results of glycopeptide enrichment and glycosylation analysis from human serum also show egood enrichment selectivity from real biological samples. This work exhibits high selectivity, high sensitivity, good stability and operability, indicating its potential for applications of glycopeptides enrichment in post-translational modification proteomics.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Xueming Bao,Fangying Dong,Yuanyuan Yu,Qiang Wang,Ping Wang,Xuerong Fan,Jiugang Yuan
Considerable attention has been focused on the application of natural cellulosic materials due to the cost-effectiveness, renewability, and biodegradability of cellulose . However, gaps between cellulose-based and petroleum-based materials still exist. In this study, a green, environmental modification method for cellulose by enzyme-initiated reversible addition fragmentation chain transfer (RAFT) graft polymerization was reported. First, the grafting of acryloyl chloride (AC) provided reaction sites on cellulosic fiber surfaces, followed by the enzymatic RAFT graft polymerization of acrylamide (AM). The grafting of well-controlled polyacrylamide (PAM) chains on the cellulosic material surface was verified by Fourier transform infrared spectrometer (FTIR), X-ray photoelectron spectroscopy (XPS), and the controlled grafting ratio was also estimated. The transition of wetting behaviors after the modification of AC and PAM also provided evidence for successful grafting on cellulosic materials. In addition, this method can be well applied for the preparation of various functional cellulosic materials.
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危险品化学品经营许可证（带存储）