CELLULOSE
·
2021
·Vol. 28
·期 11
·7123-7142
·
IF 5.044
Peng Dan,Li Wenjie,Zheng Liuchun
Repurposing corn stalk pith (CSP) from agriculture waste is significant for environmental protection and sustainability. In this work, enzymatic modification of inexpensive and biodegradable CSP was used to prepare two environmentally friendly and efficient oil sorbents by a one-step in situ strategy: (1) cellulose-grafted octadecylamine via the laccase (LAC)-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) system (LCSP) and (2) lignin-grafted octadecyl gallate via the LAC-guaiacol system (GCSP). The oil sorbents were characterized, revealing that they had low density, were hydrophobic (water contact angle (CA) up to 129.7°–144.9°), and had a good diesel sorption capacity in the range of 34–41 g/g, superior to those of most agricultural waste materials reported to date. The sorption kinetic results show that LCSP and GCSP fit a pseudo-second-order model. Sorption equilibrium was simulated by four commonly used isotherm models, and error analysis was performed, confirming that the Freundlich equation best fit the experimental data. Oil sorption was exothermic, with the best oil sorption performance achieved at room temperature. The sorption by the two sorbents of simulated low-concentration dispersed oil was similar, and the sorption by GCSP of high-concentration suspended oil was the best. The effects of solution pH, ion species, salinity, and temperature were also investigated. Overall, the obtained materials demonstrated outstanding environmentally friendly characteristics due to their high availability, agricultural origin and potential for use in remediating light oil spills owing to their fast sorption and high and stable sorption capacity.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Lijun Sun,Xiaoyu Xu,Xingyu Gu,Dongliang Hu,Zhou Zhou
Lignin, the second most abundant renewable biopolymer, has great potential for utilization. This study enhances lignin’s antioxidant activity through modifying its structure with laccase and evaluate its effect on asphalt binder performance. This study evaluates the effects of reaction conditions (pH, time, temperature, and laccase dosage) on the chemical structure and antioxidant activity of enzymatic hydrolysis lignin (EHL). Waste lignin and EHL modified binders (WLA and ELA) were subjected to chemical and rheological analyses under different aging conditions. Results showed that laccase treatment increases phenolic hydroxy (Ph-OH) groups in lignin, enhancing antioxidant activity. Optimal conditions were pH of 5.0, 25 °C, 6 h, and 1.2 mL/g laccase. FTIR results indicated that EHL inhibits oxidation and decelerates binder aging. Rheological tests demonstrated improved binder’s resistance to aging, deformation, cracking, and fatigue compared to waste lignin. This study supports sustainable road construction by enhancing waste lignin through biomodification and conserving non-renewable resources.
研究领域:
土木工程
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiankang Fan,Yan Zhao,Wei Mao,Hao Zhang,Meng Li,Yang Luo,Hui Zhou,Qingwu Shen,Wei Quan,Jie Luo
A novel enzyme-modified cheddar cheese was prepared and the molecular mechanism of cheese flavor compensation by synergistic action of cell-free extracts and enzyme systems was investigated. By comparing five different protease-peptidase combinations, the group of neutral protease and flavor protease was found to increase the total leucine, valine, and isoleucine content (17.056 ± 0.136 g/kg) and the soluble nitrogen content was up to the level of a 12-month-matured cheese. Molecular docking and molecular dynamics simulations demonstrated their mode of action on four monomeric caseins. Adding a cell-free extract resulted in volatile flavor substances in the enzyme-modified cheese that were closest to those in the 12-month-matured cheese. This might be due to the flavor compensation effect of the conversion of leucine to 3-methylbutyraldehyde by transaminases and decarboxylases, and the conversion of 3-methylbutyric acid to 3-methylbutyraldehyde by ketoacid dehydrogenase and aldehyde dehydrogenase. This is essential for the enzyme modified cheddar cheese preparation.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2020
·Vol. 55
·期 12
·3533-3541
·
IF 2.773
Dingpeng Zhou,Jing Liu,Shaowei Liu,Xue Liu,Xiaozhi Tang,Xueze Lv
Summary Undaria pinnatifida insoluble dietary fibre (UIDF) was modified by alkali (NaOH solution) and complex enzyme (xylanase and cellulase) to improve the physicochemical properties. Scanning electron microscopy revealed that the surface structure after modification was rough and loose. The characteristic absorption peaks in Fourier transfer infrared spectrometry and X-ray diffraction patterns showed that enzymes can further hydrolyse the UIDF than alkali mainly in amorphous region, and increased the soluble dietary fibre content to 16.31%. The alkaline and complex enzymatic modification both resulted in higher water retention capacity, water swelling capacity, oil absorption capacity, glucose adsorption capacity and the inhibition ability towards α-amylase. The complex enzymatic modification exhibited better features in almost all properties, and the modification did not change the inhibiting mechanism on α-amylase (non-competitive type). Overall, both two modifications could effectively improve the properties of UIDF, which may promote its use in food applications.
研究领域:
食品科学
·
生物技术
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yufeng Shen,Xinru Zhang,Jiangpeng Su,Lin Lin,Zeyi Jiang,Lin Qiu,Sida Wang,BingJi Wu,Changyu Pu,Xinzhi Cai,Yuqiao Liu,Xinxin Zhang
Thermally conductive cellulose-based composites have great application potential in the thermal management of portable and wearable electronic devices. In this work, cellulose-based composites with excellent mechanical and thermal properties were developed by using lysozyme-modified graphene nanoplatelets (LmGNP), epichlorohydrin (ECH), and hydrolyzed cellulose via forming strong double-cross-linked interface interactions, including the hydrogen bond network generated between LmGNP and cellulose and the chemical cross-link of ECH. As for the composites containing 8 wt % LmGNP, the in-plane thermal conductivity was 3.341 W·m–1K–1, while the tensile stress was 114.60 MPa, which increased by 297.3 and 146.2%, respectively, compared to pure cellulose. Along with the good stability, insulation, and lightweight properties, the fabricated composites have the potential to become a promising heat dissipation material for wearable electronic devices.
研究领域:
材料科学
·
复合材料
·
热管理
·
纳米技术
·
可穿戴电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）