BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Konglong Feng,Zaocheng Huang,Bo Peng,Weijie Dai,Yunqi Li,Xiaoai Zhu,Yunjiao Chen,Xing Tong,Yaqi Lan,Yong Cao
Deacidification of high-acid soy sauce residue (SSR) oil is crucial to utilization of SSR oil. Aspergillus niger lipase (ANL) has been widely applied for such purpose while its immobilization still has large room for improvement. ANL was immobilized onto six different macroporous acrylic resins, accounting the effect of the different textural properties of resins on stability and their potential for application in enzymatic deacidification. The resin MARE with lower porosity, higher bulk density, and medium hydrophobicity, was chosen as the best carrier for the best thermostability and reusability. ANL-MARE is a promising catalyst than Novozym 40086, which not only exhibited higher deacidification activity and good thermostability, but also was continuously reused for 15 cycles and efficiently catalyzed from high-acid SSR oil into diacylglycerol-enriched oil. Therefore, immobilized ANL was a novel, low-cost and recyclable biocatalyst that could be used as a good alternative to higher-cost commercial lipases in industrial applications.
研究领域:
生物化学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Fermentation-Basel
·
2020
·Vol. 6
·期 1
·25
·
IF 0
Wu Zhong,Tuo Chen,Hong Yang,Erhu Li
High citric acid content in kiwifruit wine would lead to bad sensory experience and quality deterioration. It is opportune and crucial to develop an appropriate and feasible method to degrade citric acid for kiwifruit wine. The non-Saccharomycesyeasts confirmed to have the ability to degrade citric acid were screened and used in kiwifruit wine fermentation in the study. A representative number of 23 yeasts with a strong citric acid degradation ability was identified by molecular approaches. JT-1-3, identified to bePichia fermentans, was preferred for high citric acid degradation and strong stress resistance in association with RV002 (commercialSaccharomycescerevisiae). Then it was pure-cultured in kiwifruit juice, and the results indicated that citric, malic and tartaric acids declined significantly from 12.30, 3.09 and 0.61 g/L to 11.00, 2.02 and 0.41 g/L after fermentation, respectively, resulting in the significant decrease in total acid in kiwifruit wine. The analytical profiles for amino acids and volatile compounds showed thatPichia fermentansJT-1-3 could improve amino acids’ proportion and increase the volatile compounds of alcohols, esters and phenols. This work indicated that JT-1-3 has great potential to be applied for fruit wine with high level citric acid.Keywords:non-Saccharomycesyeast;kiwifruit wine;citric acid;deacidification fermentation;GC-MS
研究领域:
食品科学
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微生物学
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酿酒学
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产品关联
DOI
INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Weidong Lu,Zihao Xu,Meiyuan Li,Youheng Ma,Zijun Xiao
Deacidification is a critical step in alkali catalyzed transestrification of acidic oil for biodiesel production. In this work, optimization of the process variables and insights into the mechanisms of deep eutectic solvent (DES) assistance of deacidification of acidic oil catalyzed by Amberlyst 15 were investigated. Specifically, response surface methodology (RSM) and Box-Behnken Design (BBD) were employed to optimize the three process variables, namely temperature, catalysis loading, and molar ratio of methanol to oleic acid . Furthermore, the catalysts before and after used with and without DES assistance were characterized by FTIR and XRD in order to elucidate the chemical mechanisms involved in the process. Results showed that maximum deacidification rate (DR) of 98.02% was achieved in the deacidification process assisted by DES at the optimal process conditions (temperature 72.02ºC, catalyst loading 5.05 wt%, and methanol to oleic acid molar ratio 33.02), compared to 89.68% of the control (without DES assistance). Data analysis and verification results further confirmed the suitability of BBD and RSM methods in optimizing the process. More interestingly, dramatic higher catalytic activity (DR of 76.33% vs 64.16%) of Amberlyst 15 with DES assistance compared to that of the control after 4 cycles was observed. Finally, FTIR spectra confirmed that less water absorbed onto the surface of Amberlyst 15 with DES assistance was the major reason for higher DR and better catalyst reusability in comparison with the control.
研究领域:
化学工程
·
可再生能源
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 44
·21287-21300
·
IF 3.925
Yawen Yin,Xu Fei,Jing Tian,Longquan Xu,Yao Li,Yi Wang
The main challenge of rice bran oil (RBO) as a highly nutritional edible oil is the high content of free fatty acids. Biocatalytic esterification is an effective strategy to reduce acid value of RBO. In this study, polydopamine/hydroxyethyl methacrylate/acrylamide hydrogel microspheres (PHAMs) are designed and synthesized to immobilize lipase. The PHAMs have excellent water retention and provide an oil–water interface for the biocatalytic esterification of lipase. The catalytically active center of lipase is induced to open by the oil–water interface and its catalytic activity is fully developed. At the same time, the micro-water environment provided by hydrogel microspheres prevents hydrolysis of lipid products. Lipase-polydopamine/hydroxyethyl methacrylate/acrylamide hydrogel microspheres (L-PHAMs) exhibit strong immobilization capacity (enzymatic loading is 13.34 mg g−1), enhanced activity (1.11-fold that of free lipase), and excellent reusability (it maintained 37.8% of the free lipase activity after 10 cycles). The L-PHAMs still maintain 86.24% of the initial enzymatic activity after 15 days, while the free lipase activity is only 25.31%. In addition, kinetic determination shows an increased affinity between L-PHAMs and the substrate (Km is 1.07 μmol L−1). High-acid rice bran oil (HBRO) is successfully deacidified by an esterification reaction using L-PHAMs as catalysts. This process enabled an unprecedented deacidification efficiency of up to 98.19% in a short time (2 h). Overall, biocatalytic esterification by L-PHAMs is an economical and sustainable deacidification method.
研究领域:
生物化学
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食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
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2023
·
IF 4.3
Hong Shi,Weihua Zhu
Excessive amounts of free acids will significantly reduce the quality of heavy alkylbenzene sulfonic acid and its downstream products. To get rid of the excess free acids in heavy alkylbenzene sulfonic acid, a novel three-step deacidification technique called barium salt neutralization method was developed with the aware of “process intensification” in this work. Various factors affecting the deacidification process were thoroughly studied. Results show that using this deacidification method, the free acids content in heavy alkylbenzene sulfonic acid can be reduced from 1.5% to less than 0.1% at the producing condition of room temperature, atmospheric pressure, reusable green solvent, and short time. The free acids removal rate and recovery rate of feed can reach to 96.7% and 95.3%, respectively. It has been demonstrated that the barium salt neutralization method is an effective way to lower the amount of free acids in heavy alkylbenzene sulfonic acid, and can be readily turned into practical applications.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CULTURAL HERITAGE
·
2024
·
IF 3.5
Bei He,He Zhao,Weiying Li,Ling Meng,Chuanfu Liu,Huiming Fan,Junli Ren,Huiping Xing,Pujun Jin
Deacidification is a necessary and urgent means of protecting acidified paper documents. However, the contradiction between deacidification efficiency and uniformity in existing aqueous or organic phase deacidification methods has not been resolved yet, which is mainly attributed to the differences in capillary action of paper on solvents with different polarities. In this work, a strategy of two-phase deacidification was proposed to achieve efficient and uniform deacidification and long-lasting aging resistance. Impregnation of nano magnesium oxide organic dispersion of deacidified paper achieved efficient batch deacidification and sufficient alkali reserve. Using ultrasonic atomization of saturated calcium hydroxide aqueous solution, the penetration of alkaline substances into paper promoted uniform deacidification based on strong capillary action. Meanwhile, microstructural reinforcement of paper fibers was achieved based on the multiple interactions. This method can endow the treated paper with better thermal stability and long-lasting aging resistance. After artificial accelerated aging for 30 d, the treated paper samples still maintained the highest tensile index (18.46 Nm/g), folding endurance (8.5 times), tear index (3.95 mN·m 2 /g) and displayed negligible chromatic aberration (∆ E = 2.46 ± 0.21). This method greatly extends the lifespan of acidified paper, which has significant value for the protection of paper documents.
研究领域:
文物保护
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD PROCESS ENGINEERING
·
2018
·Vol. 42
·期 2
·e12969
·
IF 1.955
Wu Zhong,Xinyue Li,Hong Yang,Erhu Li
In this study, an effective deacidification process for kiwifruit wine using ion exchange resins was investigated. Static adsorption experiments were conducted to screen an appropriate resin and optimize the volume ratio of resin to wine. Dynamic adsorption experiments were conducted to optimize the flow rate. Sensory and chemical analysis of the deacidified kiwifruit wine were also performed. The results demonstrated that 330 resin with a maximum adsorption capacity decreased total acid and citric acid to 4.32 and 1.39 g/L in kiwifruit wine. The acid adsorption process fitted Ho's sorption kinetic model well. The volume ratio of the 330 resin to wine and the feed flow rate were further optimized to be 1:30 and 4 mL/min. Kiwifruit wine with total acid and citric acid contents of 7.98 and 4.74 g/L was obtained, under optimum conditions, while preserving alcohol, vitamin C (Vc), flavonoids and phenol content, and improving the flavor. Practical applications The high acidity in kiwifruit wine depress the sensory quality and attraction to consumers. Resins are applied for liquid treatment because of high efficiency, insolubility and low cost. This work showed that 330 resin treatment is a promising method to deacidify kiwifruit wine and provided an economical and effective processing method for kiwifruit processing enterprises. Monitoring acidity change and kiwifruit wine quality help enterprises better control the process. Furthermore, the easy removal of resins will greatly reduce energy consumption, resulting in lower processing cost.
研究领域:
食品科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiaochun Ma,Zhaodong Zhu,Haichuan Zhang,Shenglong Tian,Xiaohong Li,Huiming Fan,Shiyu Fu
Deacidification and surface self-cleaning are of great significance for the long-term preservation of historic literature. Herein, a superhydrophobic self-cleaning coating, derived from nanocellulose coated with CaCO 3 particles is constructed via chemical vapor deposition (CVD) for the first time for the preservation of historic paper. The static contact angle of superhydrophobic paper reached more than 150° and the minimum sliding angle was 6.4°. Deacidification effect was achieved with a desired pH value in the range from 7.50 to 7.77 and the maximum alkali storage was up to 1.235 mol/kg. It is found that the low-cost CaCO 3 nanoparticles can not only remove the acid substances, but also gave the paper function of self-cleaning, which is very great significant for the protection of paper-based relics.
研究领域:
材料科学
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文物保护科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 9
·2108178
·
IF 18.808
Lihong Zhou,Xiaofeng Li,Kecheng Cao,Zhimin Jia,Honghan Long,Yang Li,Guohong Tao,Ning Liu,Jie Zhang,Lijian Ma
The deacidification of highly acidic industrial wastewater, such as the spent fuel reprocessing feed liquid, is of great significance for the smooth progress of the subsequent treatment processes. Herein, a novel covalent organic framework (COF) membrane with bidirectional anisotropic Turing structures is synthesized for the first time and used for deacidification. The COF membrane presents linear and hydrophobic properties on one side and porous and superhydrophilic properties on the other side, which makes the water permeability of hydrophilic side 45 times higher than that of the hydrophobic side and effectively prevents the reverse osmosis of water. Impressively, the COF membrane has excellent thermal, acid, and irradiation stabilities, and an extraordinarily high ability to intercept metal ions in a complex multi-ion solution containing 5 m HNO 3 , with the interception rate up to 100%. However, H + can easily pass through the membrane with the permeation flux of 1015.7 mol L −1 m −2 , which realizes the efficient deacidification of high acidic solutions. This study provides not only a new idea for the design and preparation of Turing-structural membranes, but also a feasible strategy for the deacidification and process simplification of spent fuel reprocessing feed liquid and other industrial wastewater with high acidity.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Liujia Xu,Yi Zhang,Vladimir Zivkovic,Mingming Zheng
Rice bran oil (RBO) contains a variety of nutrients, but the high acid values largely hinder its processing into edible oil. Thus, the tandem continuous-flow reactors are proposed and developed for the enzymatic deacidification of RBO and simultaneous production of functional oils. The results indicate that the Candida antarctica lipase B (CALB) immobilized on the hydrophobic ordered mesoporous silicon (OMS-C 18 ) increased 6.6 times of the catalytic activity and improved at least 20 ℃ of temperature tolerance compared to the commercial Novozym 435. The tandem continuous-flow enzymatic reactors removed 91.4% of free fatty acid and increased 9 and 12 times of phytosterol ester and diacylglycerol in RBO, respectively. Moreover, the retention rate of γ-oryzanol was at least 40% higher than that obtained by traditional alkali refining. This study provides an effective and sustainable method to continuously convert the low-value RBO into value-added products, which brings huge potential to cleaner industrial production.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 37
·期 2
·290-299
·
IF 1.595
Xuemei Wang,Yingping Qi,Yongfeng Shen,Hua Li
A new chitosan derivative (CS-CHO) was successfully synthesized based on chitosan (CS) and cyclohexene oxide (CHO). It proved that CHO was successfully grafted onto the amino group of CS by N-alkylation reaction through the characterization of FTIR, XRD and DSC-TGA. The mechanical properties (tensile strength, folding endurance, tearing strength), optical properties (whiteness, glossiness) of the CS-CHO coated paper sample were tested. The results showed that the mechanical properties of the paper treated with 10 % CS-CHO increased significantly without changing the appearance of the paper. The paper permanence (tensile strength, folding endurance, tearing strength and pH) of the treated paper samples tested by dry-heat aging test. The results showed that the permanence of the treated paper samples was significantly improved compared with the blank aged paper samples, which indicated that CS-CHO had the function of deacidification while reinforcing the paper samples, providing the possibility for deacidification and reinforcement in one-step method and playing a positive role in the paper preservation.
研究领域:
材料科学
·
化学
·
纸张保护
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jiaxing Cui,Ming Gui,Yuzhi Zhang,Delong Chen,Wenjuan Liu,Chengfei Zhu
Paper acidification is the primary factor causing the rapid deterioration of paper documents. To overcome drawbacks of single type of deacidification agent for paper deacidification, the innovative application of a composite deacidification agent was proposed and significantly enhanced the comprehensive performance of the paper and prolonged the stability of acidic paper. The environmentally friendly fluorocarbon solvent of methyl perfluoroisobutyl ether was employed as the main solvent, reducing the harm to operators and the environment. Different calcium magnesium oxide (CaMgO 2 ) nanocomposites were synthesized and their effect on paper performance was explored by comparing the pH, whiteness, tensile strength and alkali reserve of the treated paper samples. The results indicate that owing to the excellent dispersion effect of calcium magnesium oxide in fluorocarbon solvents and their good compatibility with paper fibers, it has the slightest impact on the appearance of paper. Moreover, the pH value is raised from 5 to 9, and the deacidification effect is most remarkable when the molar ratio of Mg to Ca is 0.2:0.8. After the deacidification treatment and artificial aging treatment, the paper performance is still maintained with good pH and mechanical strength and almost no generating ink marks, which is suitable for the protection of ancient books and archives through deacidification.
研究领域:
文物保护
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）