Journal of Oleo Science
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2021
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IF 1.601
Wenyi Chen,Maomao Kou,Shaoyan Lin,Nanjing Zhong
In this study, Candida antarctica lipase B (CALB), Rhizomucor miehei lipase (RML) and Lecitase® Ultra (LU) were immobilized onto the mesoporous silica SBA-15. The glycerolysis performance of the obtained supported lipases (lipase@SBA-15) in solvent systems was carefully investigated. LU@SBA-15 exhibited good glycerolysis performance in solvent-free system, with diacylglycerols (DAG) content and triacylglycerols (TAG) conversion at 52.4 and 98.6% respectively obtained after 12 h reaction at 60°C. CALB@SBA-15 showed good glycerolysis activity in tert-pentanol and tert-butanol systems, with TAG conversion over 90% obtained. In addition, the present CALB@SBA-15 exhibited selectivity for monoacylglycerols (MAG) production, with glycerol to TAG molar ratio increased to 3:1, MAG content over 80% and TAG conversion over 99% could be obtained from both tert-pentanol and tert-butanol systems. However, RML@SBA-15 showed low glycerolysis activity neither in solvent nor in solvent-free systems. The present results favor the practical enzymatic design for MAG and DAG production.
研究领域:
生物化学
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酶工程
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Xin Wang,Lihong He,Jianrong Huang,Nanjing Zhong
In this study, SBA-15 was modified by halogen & haloalkanes and later used to immobilize lipases. The hydrolysis activity and the glycerolysis performance of the immobilized lipases was carefully studied. Highest activity of the immobilized Candida antarctica lipase B (CALB), Lipase from Aspergillus oryzae (AOL), Lecitase® Ultra (LU) and lipase from Rhizomucor miehei (RML) was respectively at 5577, 12000, 2822 and 11,577 U/g; in addition, the highest activity was obtained from the lowest or moderate lipase loading, at 25.73, 90.72, 89.52 and 30.56 mg/g respectively. The mechanism of lipase immobilization was studied and it was through interfacial activation. The halogen & haloalkanes modification of SBA-15 afforded considerable glycerolysis activity for diacylglycerols (DAG) preparation. CALB@SBA-15-CH 2 CH 2 (CF 2 ) 5 CF 3 and CALB@SBA-15-CH 2 CH 2 (CF 2 ) 7 CF 3 were suitable for DAG production, they both exhibited good reusability in glycerolysis reaction, with 117.36% and 93.06% of their initial glycerolysis activity retained respectively after ten cycles of reuse. The relationships between temperature with triacylglycerols (TAG) conversion were ln V 0 = 3.13–3.07/T and ln V 0 = 7.90–4.64/T respectively for CALB@SBA-15-CH 2 CH 2 (CF 2 ) 5 CF 3 and CALB@SBA-15-CH 2 CH 2 (CF 2 ) 7 CF 3 ; in addition, their activation energy ( Ea ) was respectively at 25.50 and 38.54 kJ/mol.
研究领域:
生物化学
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酶工程
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材料科学
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 6
·1625-1634
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IF 2.936
Guang Binxiong,Zhang Wei,Wu Yuefeng,Xiao Yahui,Su Miaojun,Liu Yong
Dual sulfonic acid functionalized heteropolyacid-based ionic liquids were synthesized, characterized and used as novel solid acid catalysts for selective esterification of glycerol with acetic acid toward fuel-additive triacetylglycerol (TAG). The results indicated that the as-prepared [BS 2 TMEDA]HPW 12 O 40 catalyst had the highest catalytic activity and selectivity to TAG compared with commercial H 3 PW 12 O 40 , H 2 SO 4 and Amberlyst-15 catalysts, which was attribute to its medium acidity of dual-SO 3 H groups and carbon chain length. The effects of reaction temperature, catalyst amount, acetic acid to glycerol mole ratio and reaction time on glycerol conversion and selectivity to TAG were also investigated. Under the optimized reaction condition, the glycerol conversion and selectivity to TAG reach 100% and 70.9%, respectively. Moreover, no significant loss in glycerol conversion and selectivity to TAG were observed after reused four recycles, showing favorable catalytic reusability and stability. Graphical Abstract
研究领域:
化学工程
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催化材料
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DOI
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
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2020
·Vol. 97
·期 6
·603-614
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IF 1.659
Jia Luo,Zeping Wang,Shangzhi Deng,Fan Zhang,Guirong Bao,Junni Mao,Wenjing Yang
Direct glycerolysis of novel edible Sacha Inchi ( Plukenetia volubilis L.) seed oil (PvLO) into diacylglycerols (DAG) and monoacylglycerols (MAG) was studied over solid Na 2 SiO 3 with or without microwave assistance. The glycerolysis yield was calculated by qualitative and semiquantitative analyses of 1 H NMR, 13 C NMR, and FT-IR spectra. The yields of ~33% 1, 3-DAG, ~16% 1, 2-DAG, ~40% 1-MAG, and ~2.3% 2-MAG were achieved after 16 hours at 120 °C in three consecutive cycles using acetone, with an interesterification rate of 92%. The modified oil showed enhanced gelation ability at low temperatures. The yield of 1, 2-DAG can be increased by adding acetone as solvent. The fatty acid compositions and unsaturated structure of lipids were less destroyed after alkaline glycerolysis. However, more α-linolenic and linoleic acids were transferred to the sn -2 position of glyceryl skeleton. The oxidative stability of the modified oil was still controllable. In summary, this work provides a feasible method to convert polyunsaturated plant oils into oils rich in DAG and MAG with less destructive impact on the olefinic structure of oil. Also, it provides a useful example of how to quickly evaluate the influence of chemical modification on the chemical structure of plant oils by using various spectral technologies.
研究领域:
食品科学
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化学工程
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植物油脂加工
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DOI
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
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2024
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IF 1.9
Haotian Fei,Congwen Zheng,Zhenyu Wu,Xiaojiang Liang,Yong Nie
Biodiesel is an important alternative renewable liquid fuel due to its eco-friendly, non-toxic, and lower emissions. In this work, glycerol esterification catalyzed by zinc glycerolate was employed as a pretreatment to prepare biodiesel from acidified palm oil. The effects of stirring rate, catalyst amount, glycerol to free fatty acids (FFAs) molar ratio, and reaction temperature on the conversion of FFAs and concentration of monoglycerides, diglycerides, and triglycerides were investigated and optimized. The results show that the conversion of FFAs could reach 99.16% under the optimized conditions. Moreover, the kinetics of glycerol esterification catalyzed by zinc glycerolate at 160–200°C was obtained. Additionally, a comprehensive evaluation of the new biodiesel production process was also conducted. As a result, higher biodiesel content in the crude biodiesel phase was obtained after transesterification and separation using this new process. Overall, the study contributes to the utilization of waste oils to produce renewable energy and to minimize the waste management problem. Graphical Process design for biodiesel production from acidified palm oil via glycerol esterification catalyzed by zinc glycerolate as a pretreatment method.
研究领域:
生物化学
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可再生能源
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催化化学
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DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2019
·Vol. 100
·期 4
·1426-1435
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IF 2.422
Xihong Zhao,Fenghuan Zhao,Nanjing Zhong
BACKGROUND In this study, SBA-15 was functionalized by silane coupling reagents, then lipase from Thermomyces lanuginosus (TLL) was immobilized onto the parent and the organically modified SBA-15 for diacylglycerol (DAG) production through glycerolysis. RESULTS Diacylglycerol content of 54.77 ± 0.63%, and triacylglycerol (TAG) conversion of 77.75 ± 1.24%, were obtained from the parent SBA-15 supported TLL-mediated glycerolysis reaction in a solvent-free system. However, poor performance was unexpectedly observed when co-solvents were introduced into the reaction system. After organic modification, the functionalized SBA-15 supported TLL samples all exhibited reasonable performance, producing DAG content over 40 wt% and TAG conversion over 70 wt%. Higher DAG content, up to 59.19 ± 1.10%, was observed from the phenyl group-modified SBA-15 supported TLL. The operational stability of the immobilized TLL samples in glycerolysis was also improved after organic functionalization. The phenyl group-modified SBA-15 supported TLL showed good reusability in the present glycerolysis reaction, and 95.21 ± 4.87% of the initial glycerolysis activity remained after five cycles of reuse. CONCLUSION The organic modification of SBA-15 improved the catalytic performance of its supported TLL in glycerolysis, in terms of TAG conversion, DAG content, and reusability. © 2019 Society of Chemical Industry
研究领域:
化学工程
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生物催化
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材料科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Yihao Yang,Yuanyuan Tu,Zhuoyao Lou,Xuefeng Gui,Jiali Kong,Zhenzhu Huang
Photothermal superhydrophobic coatings are promising for anti-icing/deicing. However, preparing such coatings from environmentally friendly and sustainable strategies is challenging. Herein, a bio-based and durable photothermal superhydrophobic coating is prepared via layer-by-layer strategy. Bio-based methacrylic acid epoxidized soybean oil oligomers are synthesized as an alternative to petroleum-based binders. Meanwhile, efficient photothermal conversion of hydrophobic particles are enabled by oxidative self-polymerization of dopamine to decorate hydrophobic silica particles grafted with hydrophobic long-chain alkanes and photo-curable methacrylic acid moieties. Ultimately, the superhydrophobic coating is achieved by spraying photothermal hydrophobic particles onto an oxygen-inhibited layer of pre-cured bio-based binder followed by thorough photocuring treatment. The coating exhibits powerful water repellency (WCA of 158.2 ± 1.6°, SA of 4.6 ± 0.8°), good robustness, chemical and UV irradiation resistance. Moreover, under NIR laser irradiation (808 nm, 1 W/cm 2 ), the coating features excellent photothermal conversion efficiency (ΔT of 41.0 °C at 30 s) and stable photothermal conversion performance. And in frigid conditions (-15 °C, ∼73 ± 5 % RH), the coating delivers rapid defrosting (few seconds) and deicing (20 μL water droplet melts in 42 s) performance under NIR irradiation of 1 W/cm 2 . Therefore, the as-prepared coating provides valuable insight into global anti-icing/deicing action.
研究领域:
材料科学
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表面化学
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环境科学
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涂层技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）