Activated effect of lignin on α-amylase.
Food Chem
; 141(3): 2229-37, 2013 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-23870952
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 11 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.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Alfa-Amilases
/
Lignina
Limite:
Animals
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article