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首页> 外文期刊>Bioprocess and Biosystems Engineering >Insights into the effect of imidazolium-based ionic liquids on chemical structure and hydrolytic activity of microbial lipase
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Insights into the effect of imidazolium-based ionic liquids on chemical structure and hydrolytic activity of microbial lipase

机译:基于咪唑鎓的离子液体对微生物脂肪酶的化学结构和水解活性的洞察洞察

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摘要

This work studied the effect of the cation alkyl chain length of 1-alkyl-n-methylimidazolium chloride ([C(n)mim]Cl)-based ILs on the activity of Aspergillus niger lipase. First, the lipase activity in the presence of different ILs concentration over time was determined. ILs with shorter cation alkyl side chain length, namely [C(4)mim]Cl and [C(6)mim]Cl, promoted an increase of lipase activity; while, [C(8)mim]Cl, depending on its concentration, maintained or decreased the enzyme activity. In the presence of ILs with longer cation alkyl chain length, i.e., [C(10)mim]Cl and [C(12)mim]Cl, the lipase relative activity was reduced with 0.1 (%v/v) and until suppressed ([C(12)mim]Cl at 0.3 (%v/v)) as a result of irreversible changes in its secondary structure. Fluorescence and circular dichroism spectroscopy analysis confirmed the results achieved. These findings show that [C(n)mim]Cl-based ILs can exert different behavior on the lipase' activity (enhance, maintain or even inhibit) and structural conformation, depending on the cation alkyl chain length and their relative concentration.
机译:该工作研究了阳离子烷基链长度为1-烷基-N-甲基咪唑氯化铵([C(n)mim] Cl)的阳离子烷基链长度 - 基于曲霉脂肪酶的活性。首先,确定不同ILS浓度随时间的存在的脂肪酶活性。阳离子烷基侧链长度较短的IL,即[C(4)MIM] Cl和[C(6)MIM] Cl,促进脂肪酶活性的增加;而[C(8)MIM] CL,取决于其浓度,维持或降低酶活性。在阳离子烷基链长度较长的情况下,即[C(10)MIM] Cl和[C(12)MIM] Cl,用0.1(%v / v)降低脂肪酶相对活性,直至抑制( [C(12)MIM] CL为0.3(v / v)),其二级结构的不可逆变化。荧光和圆形二色性光谱分析证实了实现的结果。这些发现表明,根据阳离子烷基链长度及其相对浓度,基于CL的ILS可以对脂肪酶活性(增强,维持,维持,甚至抑制)和结构构象的不同行为施加不同的行为。

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