Physisorption of enzymatically active chymotrypsin on titania colloidal particles.
Physisorption of enzymatically active chymotrypsin on titania colloidal particles.
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二氧化钛胶体颗粒上酶活性胰凝乳蛋白酶的物理吸附
DOI:
10.1016/j.jcis.2015.05.022
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发表时间:
--
影响因子:
9.9
通讯作者:
K. Rezwan
中科院分区:
文献类型:
--
作者:
L. Derr;R. Dringen;L. Treccani;N. Hildebrand;L. ColombiCiacchi;K. Rezwan
In this study we use a straightforward experimental method to probe the presence and activity of the proteolytic enzyme α-chymotrypsin adsorbed on titania colloidal particles. We show that the adsorption of α-chymotrypsin on the particles is irreversible and pH-dependent. At pH 8 the amount of adsorbed chymotrypsin is threefold higher compared to the adsorption at pH 5. However, we observe that the adsorption is accompanied by a substantial loss of enzymatic activity, and only around 6–9 % of the initial enzyme activity is retained. A Michaelis–Menten kinetics analysis of both unbound and TiO2-bound chymotrypsin shows that the KMvalue is increased from ∼10 μM for free chymotrypsin to ∼40 μM for the particle bound enzyme. Such activity decrease could be related by the hindered accessibility of substrate to the active site of adsorbed chymotrypsin, or by adsorption-induced structural changes. Our simple experimental method does not require any complex technical equipment, can be applied to a broad range of hydrolytic enzymes and to various types of colloidal materials. Our approach allows an easy, fast and reliable determination of particle surface-bound enzyme activity and has high potential for development of future enzyme-based biotechnological and industrial processes.
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DOI:
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发表时间:
1946
期刊:
影响因子:
--
作者:
W. D. Harkins;G. Jura;E. Loeser
通讯作者:
E. Loeser
DOI:
10.1039/ft9969203151
发表时间:
1996
期刊:
Journal of the Chemical Society, Faraday Transactions
影响因子:
--
作者:
H. Căldăraru;G. Timmins;M. Davies;B. C. Gilbert
通讯作者:
B. C. Gilbert
影响因子:
8.6
作者:
Z. Adamczyk
通讯作者:
Z. Adamczyk
影响因子:
6.2
作者:
J. Grime;K. Lockhart;B. Tan
通讯作者:
B. Tan
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
Ludmilla Derr;Sascha Steckbeck;R. Dringen;L. Colombi Ciacchi;L. Treccani;K. Rezwan
通讯作者:
K. Rezwan