LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Xingzhong Zhang,Yan Li,Jing Li,Hongshan Liang,Yijie Chen,Bin Li,Xiaogang Luo,Ying Pei,Shilin Liu
Stable O/W Pickering emulsions synergistically stabilized by heat-induced soy protein isolate (HSPI) and bacterial cellulose nanofibrils (BCNFs) were fabricated, and spray-dried to obtain edible oil powders. The emulsions with 0.2 wt% BCNFs and 2 wt% HSPI displayed homogeneous droplets size (<1 μm) and narrow size distributions, and had no obvious droplet aggregates at different oil phase ratios (10–20%) with 2 wt% beeswax. After spray drying, the obtained stable oil powders (35.9–56.8%) presented hollow smooth spherical structure with small and uniform size. The moisture content, flowability, bulk density and encapsulation efficiency of oil powders were improved by tuning the BCNFs contents and oil-to-water ratios of emulsions. Furthermore, the presence of BCNFs partially inhibited lipid hydrolysis, and oil powders with 0.1 wt% BCNFs performed optimum anti-digestibility with the minimum released FFA values of 72.5%. This work combined spray drying technique with Pickering emulsions for oil encapsulation, and optimized the emulsions properties to address the limitations of spray drying for liquid oil microencapsulation, which would provide some guidance for oil powders development.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Yingying Wei,Qian Du,Yang Wang,Pengcheng Gao,Zhifei Wang,Yong Jiang
Membrane separation technology plays an important role in nanosize-based molecules separation. The two-dimensional mesoporous membranes have attracted considerable attention for nanosize-based molecules separation. In this work, unsupported mesoporous silica nanosheets (MSNS) were prepared by the growth of template at the water/n-hexane interface using surfactant of cetyl trimethyl ammonium bromide (CTAB) micelles as templates. During the preparation process, the surfactant CTAB was removed to obtain pure two-dimensional MSNS through be washed with ethanol, followed by freeze-drying. The two-dimensional MSNS had uniform nano-pores structure, ultra-thin thickness and high surface area. The pore diameter of MSNS could be controlled by changing the concentration of n-hexane (4–10 nm). By depositing 0.50 mg of MSNS on cellulose acetate (CA) membrane, the CA-MSNS membrane could be used to purify nanosize-based molecules (such as proteins). When the CA-MSNS membranes was used to filter cytochrome c (cyt c) solution and ovalbumin (OVA) solution respectively, 93.46% of cyt c and 47.27% of OVA could pass the CA-MSNS membranes. However, after four times of filtration, OVA molecules were almost completely blocked and cyt c with purity of 99% could be obtained. Moreover, 92.23% of OVA molecules could be recycled through the elution from the surface of CA-MSNS membranes. The results indicated that two-dimensional CA-MSNS membranes had great application potential in the purification of nanosize-based molecules.
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高影响因子
ACS Omega
·
2020
·
IF 2.87
Enmin Zong,Binlu Guo,Jiayao Yang,Chao Shi,Shengtao Jiang,Zhongqing Ma,Xiaohuan Liu
The design of a reusable film adsorbent with easy solid–liquid separation for the removal of phosphate is necessary and significant but remains hugely challenging. Herein, the hyperbranched polyethylenimine-functionalized ethyl cellulose (HPEI-EC) film was successfully synthesized by a one-step solution-casting method. The structure and elemental composition of the HPEI-EC film were characterized by Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The phosphate adsorption capacity of the HPEI-EC film was 15.53 mg g–1, which is 12 times higher than that of EC. Significantly, the elongation at break of the HPEI-EC film was 13.43%, which is higher than that of the EC film (8.9%), and the HPEI-EC film had a considerable tensile strength of 13.21 MPa. Such good mechanical properties of the HPEI-EC film bring about the advantage of the saturated HPEI-EC film, allowing it to be easily taken out using a pair of tweezers, which significantly reduces the operation time and saves the cost in the application process. Furthermore, the HPEI-EC film possessed good reusability, and 71.6% of the original adsorption capacity of phosphate was retained even after five cycles. Moreover, the electrostatic interaction between protonated the amine group (-NH3+) and the phosphate ion (PO43–) is mainly responsible for the adsorption process. This study presents a low-cost and reusable film adsorbent for the effective removal of phosphate from water and provides an easy solid–liquid separation method for use in the adsorption field.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2016
·Vol. 92
·期 6
·1203-1210
·
IF 2.738
Fengli Wang,Guanglei Zhao,Xiongfei Lang,Junrong Li,Xiaofeng Li
BACKGROUND Long-chain cellulose esters can be used as packaging materials, film materials, biodegradable plastics and drug delivery agents. Chemical methods are commonly adopted for preparation of these esters using traditional chemical catalysts and organic solvents, which result in environmental and safety problems. RESULT A new enzymatic method was tested for synthesis of long-chain cellulose esters in mixed ionic liquids. The key reaction conditions, including mass ratio of ionic liquids, acylating agents, lipase/cellulose mass ratio, reaction temperature and substrate molar ratio, showed significant influences on enzymatic acylation. FT-IR and 1 H NMR spectra indicated the successful acylation of hydroxyl groups. SEM and XRD data showed significant changes in morphologies and crystallinity. The thermal properties of products were different from the original due to the disruption effect of ILs and the enzymatic acylation. CONCLUSION A facile one-step route is presented for synthesis of long-chain cellulose esters. The lipase-catalyzed synthesis is an ecofriendly and green approach for the modification of cellulose by replacing traditional chemical catalysts with enzymes and replacing organic solvents with ionic liquids. This biocatalytic approach may find its applications in preparation of potentially biodegradable materials for food, pharmaceutical and related industries. © 2016 Society of Chemical Industry
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高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Ming Li,Shiyu Fu,Altaf Halim Basta
Light-induced shape-memory polymer (LSMP) materials have advantages of remote control and precise stimulation under suitable photoactive factors. The excellent performance, stability, and low cost are significant for LSMP materials. Herein, a novel stable and cheap LSMP was prepared with polyurethane (PU) and copper sulfide nanoparticles (CuS NPs) supported on modified cellulose nanocrystals (MCNC) (CuS NPs@MCNC). For the photosensitivity, CuS NPs were formed and assembled on MCNC without other additives. These prepared LSMP films exhibited good light-induced shape memory, which was ascribed to the highly photothermal effect of CuS NPs. We found that the shape recovery ratio was 97.4 % when the PU nanocomposite film containing 0.2 wt.% CuS NPs@MCNC was irradiated by near-infrared (NIR) for 21 s. The ratio was still over 85.7 % after five times of repeat test. These LSMPs contained CuS NPs@MCNC have potential to be applied as a prospective material for medical devices and new packaging.
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高影响因子
INDOOR AND BUILT ENVIRONMENT
·
2025
·
IF 2.9
Pengfei Zhang,Wenjian Han,Bo Zhou,Haiqian Zhao
The metal-organic framework MIL-100(Fe) is a novel humidity-regulating material, but it has poor water vapour desorption performance. To address this issue, MIL-100(Fe) was modified using 20% lithium chloride (LiCl), forming stable coordination bonds through ion-dipole interactions. These bonds attract water molecules, enhancing the adsorption capacity and improving the structural stability of the material. After modification, its moisture capacity was increased by 2.42 times, and the desorption amount was increased by 7.22 times, with an overall improvement in moisture adsorption–desorption equilibrium. However, the use of inorganic salts presents a leakage problem in high-humidity environments. To counter this, a 3% ethyl cellulose (EC) coating was applied to the modified MIL-100(Fe). Through surface interactions, this modification improved the material's adsorption performance in non-polar environments, preventing deliquescence in long-term high-humidity conditions. The hydrophobic angle of the modified composite material reached 93°, making the surface hydrophobic. The moisture capacity of the composite material was 1.83 times that of the pure MOF, and the desorption amount was increased by 5.2 times, significantly enhancing the material's environmental humidity regulation performance. Additionally, the material demonstrated good reusability, extending its lifespan, making it suitable for use as an intelligent humidity control material in construction.
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高影响因子
IONICS
·
2023
·Vol. 30
·期 2
·1089-1100
·
IF 2.8
Zhao Jifan,Lu Zhenyong,Wang Yue,Mário Baptista José Laurindo,Wang Shaoyan
Cellulose, which is one of the main components of wood biomass, was carbonized and activated by KOH to prepare a hierarchical porous carbon. This biomass derived carbon was successfully utilized as an effective sensor’s material for simultaneously determine hydroquinone (HQ) and catechol (CC) through cyclic voltammetry and amperometry techniques. The resulting sensor exhibited wide linear ranges for HQ (0.5–3000 μmol/L) and CC (1–3000 μmol/L), with the detection limits of HQ (0.47 μmol/L) and CC (0.4 μmol/L) by amperometry technique, respectively. In addition, the prepared sensor also possesses good performances including specific selectivity, long lifetime and good applicability. The practical application in domestic lake water samples with satisfied recoveries implies the proposed sensor is promising. These results demonstrate that cellulose containing biomass have potential as an effective precursor of porous carbon materials and are applicable on various electrochemical sensors.
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 14
·期 4
·5295-5304
·
IF 4.05
Tong Dongshen,Chen Xingtao,Dong Yuxiao,Fang Zhi,Zhang Hao,Zhou Chunhui,Yu Weihua
Kaolinite is a layered silicate material with a Janus character and has been directly used as the solid catalyst for the hydrolysis of cellulose in our previous work. Reducing sugar (RS) is one of the most important intermediates for the utilization of cellulose. In the present study, metal ions dispersed on kaolinite was easily prepared and further evaluated for the hydrolysis of cellulose to RS in water. The metal ions dispersed kaolinite was characterized by XRD, BET, SEM(EDS), and XPS. The catalytic results showed that copper was the best co-catalyst among the tested metal ions and the kaolinite treated with 4(wt)% copper nitrate by calcination at 623 K showed the highest total reducing sugar (TRS) yield of 51% under 478 K with the mass ratio of catalyst to cellulose of 0.2 and weight ratio of water to cellulose of 7 for 3 h. Moreover, the catalyst could be easily regenerated by calcination and the yield of TRS on the regenerated catalyst decreased from 51 to 43.2% after four times reuse. The characterization results revealed that copper was highly dispersed on the outer SiO 4 tetrahedral layer. The surface cuprous species were the active sites and could make the C-O bond cleavage easily by attacking the positively charged carbon atoms of the β-(1,4)-glycosidic linkage in the cellulose. The leaching of the cuprous species was responsible for the deactivation of the catalyst. The copper dispersed kaolinite is the efficient catalyst for the hydrolysis cellulose to reducing sugars and worth further development. Graphical abstract
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高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 10
·e202304926
·
IF 1.9
Zhihui Chen,Tianfeng Yang,Xiaping Zhu,Yawen Liu,Donxue Ren,Yonghua Sun
Bacterial cellulose is a natural biopolymer with an ultrafine nanofibrous reticulated matrix and crosslinking active sites. In this work, composite silica aerogels were prepared using a two-step acid-base catalysis and ambient pressure drying, with methyltriethoxysilane as the silica precursor and a trace amount of bacterial cellulose as the silicon skeleton reinforcement. The preparation was carried out in water without the addition of other organic solvents and without solvent replacement. The preparation conditions were optimized, and the prepared composite aerogels were characterized using SEM, BET, FTIR, a contact angle meter, and GA-DTA. The results showed that the introduction of a trace amount of bacterial cellulose could obviously change the morphology and hydrophilicity of the aerogels, and increase its compressive strength up to 5 MPa without significant changes in its specific surface area and density. The addition of bacterial cellulose helped the aerogels maintain its original shape after being heated at high temperatures. Graphical Silicon dioxide aerogel is a polymer material with excellent properties, making it highly promising in various fields such as thermal insulation, acoustic absorption, and aerospace. However, the main challenge lies in the poor mechanical properties of silica aerogels. In this study, we present a method to reinforce silica aerogel materials using bacterial cellulose (BC). Our approach is environmentally friendly as it utilizes a pure aqueous solvent for the preparation of BC composite aerogels. This eliminates the need for any organic solvents and solvent substitution, making the process greener. Additionally, the preparation process can be completed using atmospheric pressure drying. To our surprise, we discovered that BC not only enhances the mechanical properties of the composite silica aerogel but also improves its thermal stability and hydrophobicity.
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高影响因子
Journal of Renewable Materials
·
2015
·Vol. 3
·期 2
·113-119
·
IF 0
Liu Yadong,Huang Guangcheng,Pang Yuanyuan,Han Miaomiao,Ji Shengxiang
In this work, we report a one-pot synthesis of amphiphilic miktoarm cellulose graft copolymers, cellulose (-graft-oligo(L-lactide))-graft-oligo(N-isopropylacrylamide) (Cell(-g-OLLA)-g-ONIPAM), with dual side chains of oligo(L-lactide) and oligo(N-isopropylacrylamide)
using 2-bromoisobutyl bromide functionalized cellulose (Cell(-OH)-Br) as the macroinitiator, by simultaneously conducting ring-opening polymerization and atom transfer radical polymerization using Cu/CuBr/PMDETA/Sn(Oct)2 as the catalytic system. The chemical structures and thermal
properties of Cell(-g-OLLA)-g-ONIPAMs were characterized with 1H and 13C nuclear magnetic resonance spectroscopy, differential scanning calorimetry and thermal gravimetric analysis. Cell (-g-OLLA)-g-ONIPAM could self-assemble into micelles
in the aqueous solution as confirmed by environmental scanning electron microscopy and dynamic light scattering analyses. The micellar aggregates showed a temperature-responsive property and the sizes of micelles were influenced by the ratio of temperature-responsive ONIPAM side chains. The
miktoarm graft copolymers have potential applications as biomedical or intelligent materials.
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INDUSTRIAL CROPS AND PRODUCTS
·
2016
·
IF 3.449
Ying-Zhi Han,Li Hong,Xi-Qing Wang,Ju-Zhao Liu,Jiao Jiao,Meng Luo,Yu-Jie Fu
In order to efficiently catalyze the transesterification of highly-acidic tree born oil (TBO) to produce biodiesel the magnetic cellulose microsphere (MCM) supported H 3 PW 12 O 40 (MCM-HPW) catalyst was designed and prepared successfully, and it was characterized by Fourier transform infrared, X-ray diffraction and scanning electron microscopy. Then, the MCM-HPW was used for transesterification of highly-acidic Pistacia chinensis seed oil to biodiesel for the first time. A high conversion yield (93.1%) of fatty acid methyl esters was obtained under the optimal conditions of catalyst amount 15 wt.%, methanol/oil ratio 10:1 (v:v), temperature 60 °C and reaction time 80 min. The catalyst could be easily separated from the reaction mixture under a magnetic field, and efficiently reused for at least four cycles. Thus, the prepared MCM-HPW catalyst possessed the potential of green and economic biodiesel production from highly-acidic TBO.
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高影响因子
CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Yunhui Xu,Xin Liu,Xuelan Liu,Jiulong Tan,Hongling Zhu
The bamboo pulp cellulose fiber was oxidized with HNO 3 /H 3 PO 4 –NaNO 2 mixture to obtain oxidized cellulose containing different levels of carboxyl content and with high yields. The effects of HNO 3 /H 3 PO 4 –NaNO 2 mediated oxidation on structure and properties of the fiber were investigated. The results showed that an increase in carboxyl content and weight loss of oxidized fibers appeared with increasing oxidation time. Compared with the original cellulose, the oxidized fibers had lower crystallinity (29–40%) and thermal stability. The patterns of 13 C NMR, X-ray diffraction and other testing methods revealed that the oxidation mostly occurred at C6 primary hydroxyl groups of cellulose. Moreover, an oxidized fiber with 94.14–98.59% of high yields and 1.13–3.56% of carboxyl content was obtained in the range of oxidation time from 15 to 60 min, while its mechanical properties did not change significantly. This work presented some detailed information about structure–property correlations of oxidized bamboo pulp cellulose fibers and was useful in planning applications of these products.
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高影响因子
危险品化学品经营许可证（带存储）