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Food Chem. 2013 Dec 1;141(3):2229-37. doi: 10.1016/j.foodchem.2013.05.047. Epub 2013 May 23.

Activated effect of lignin on α-amylase.

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  • 1School of Life Sciences, Shanghai University, Shanghai 200444, PR China.

Abstract

This paper reports a new kind of activator of α-amylase, lignin, which can greatly increase α-amylase activity. The promoted ratio of lignin is even much higher than that of chloride ion, the traditional activator of α-amylase. Further experimental results reveal that lignin may interact with α-amylase to form a 1:1 complex with a binding constant of 4.47×10(5) M(-1). The binding is spontaneous and lignin/α-amylase complex formation is an exothermal reaction. Hydrogen bonding plays a key role and non-radiation energy transfers from α-amylase to lignin in the binding process. Lignin, combining with α-amylase, conforms to a first-order exponential decay function. The formation of the lignin/α-amylase complex results in the reduction of α-helical content from 57.7% to 53.9%, the increase of the polarity around tryptophan residues, the decrease of the hydrophobicity, and the enlargement of protein granule volume. This work will give a deeper insight into lignin as a kind of dietary fibre, known as an important food functional factor. Furthermore, it also contributes to the exploration of an activator of α-amylase, used in the food industry.

Copyright © 2013 Elsevier Ltd. All rights reserved.

KEYWORDS:

Activator; Interaction; Lignin; α-Amylase

PMID:
23870952
[PubMed - indexed for MEDLINE]
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