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Encapsulating lipase on the surface of magnetic ZIF-8 nanosphers with mesoporous SiO2 nano-membrane for enhancing catalytic performance

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收录情况: ◇ SCIE ◇ 统计源期刊 ◇ 卓越:领军期刊

机构: [1]Hebei Univ, Coll Pharmaceut Sci, Baoding 071002, Peoples R China [2]Hebei Univ, Coll Pharmaceut Sci, Key Lab Pharmaceut Qual Control Hebei Prov, Baoding 071002, Peoples R China [3]Hebei Univ, Inst Life Sci & Green Dev, Baoding 071002, Peoples R China [4]HeBei Univ, Affiliated Hosp, Baoding 071000, Peoples R China
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关键词: Enzyme immobilization ZIF-8 Encapsulation Mesoporous silica membrane Lipase activity

摘要:
The preparation of immobilized enzyme with excellent performance is one of the difficulties that restrict the application of enzyme catalysis technology. Here, Candida rugosa lipase (CRL) was firstly adsorbed on the surface of magnetic zeolitic imidazolate framework-8 (ZIF-8) nanospheres, which was further encapsulated with a mesoporous SiO2 nano-membrane formed by tetraethyl orthosilicate (TEOS) polycondensation. Consequently, lipase could be firmly immobilized on carrier surface by physical binding rather than chemical binding, which did not damage the active conformation of enzyme. There were mesopores on the silica nano-membrane, which could improve the accessibility of enzyme and its apparent catalytic activity. Moreover, silica membrane encapsulation could also improve the stability of enzyme, suggesting an effective enzyme immobilization strategy. It showed that TEOS amount and the encapsulation time had significant effects on the thickness of silica membrane and the enzyme activity. The analysis in enzyme activity and protein secondary structure showed that lipase encapsulated in silica membrane retained the active conformation to the greatest extent. Compared with the adsorbed lipase, the encapsulated lipase increased its thermostability by 3 times and resistance to chemical denaturants by 7 times. The relative enzyme activity remained around 80 % after 8 repetitions, while the adsorbed lipase only remained at 7.3 %. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

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基金编号: 22378093 21878065 E2022201100 2241ZF111 2021A09 2021Z003

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大类 | 1 区 化学
小类 | 2 区 化学:综合
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Q1 CHEMISTRY, MULTIDISCIPLINARY

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第一作者机构: [1]Hebei Univ, Coll Pharmaceut Sci, Baoding 071002, Peoples R China
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通讯机构: [1]Hebei Univ, Coll Pharmaceut Sci, Baoding 071002, Peoples R China [2]Hebei Univ, Coll Pharmaceut Sci, Key Lab Pharmaceut Qual Control Hebei Prov, Baoding 071002, Peoples R China [3]Hebei Univ, Inst Life Sci & Green Dev, Baoding 071002, Peoples R China
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