کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1390884 | 983157 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Aleppo tannin: structural analysis and salivary amylase inhibition Aleppo tannin: structural analysis and salivary amylase inhibition](/preview/png/1390884.png)
The effectiveness and specificity of a tannin inhibition on human salivary amylase (HSA) catalyzed hydrolysis was studied using 2-chloro-4-nitrophenyl 4-O-β-d-galactopyranosyl-α-maltoside (GalG2-CNP) and amylose substrates. Aleppo tannin was isolated from the gall nut of Aleppo oak. This tannin is a gallotannin, in which glucose is esterified with gallic acids. This is the first kinetic report, which details the inhibitory effects of this compound on HSA. A mixed non-competitive type inhibition has been observed on both substrates. The extent of inhibition is markedly dependent on the substrate-type. Kinetic constants were calculated from Lineweaver–Burk secondary plots for GalG2-CNP (KEI 0.82 μg mL−1, KESI 3.3 μg mL−1). This indicates a 1:1 binding ratio of inhibitor–enzyme and/or inhibitor–enzyme–substrate complex. When amylose was the substrate the binding ratio of inhibitor to enzyme–substrate complex was found to be 2:1, with the binding constants of KEI 17.4 μg mL−1, KESI 14.9 μg mL−1, KESI2 9.6 μg mL−1. Presumably, the tannin inhibitor can bind not only to HSA, but to the amylose substrate, as well. Kinetic data suggest that Aleppo tannin is a more efficient amylase inhibitor than the recently studied other tannin with quinic acid core (GalG2-CNP: KEI 9.0 μg mL−1, KESI 47.9 μg mL−1).
The effectiveness and specificity of a tannin isolated from the gall nut of Aleppo oak was studied on the 2-chloro-4-nitrophenyl-4-O-β-d-galactopyranosyl-α-maltoside (GalG2-CNP) and on amylose hydrolysis catalyzed by human salivary amylase (HSA).
Journal: Carbohydrate Research - Volume 342, Issue 5, 9 April 2007, Pages 717–723