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Trypsin inhibitors in leaf protein concentrate

✍ Scribed by Catherine Humphries

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
395 KB
Volume
31
Category
Article
ISSN
0022-5142

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✦ Synopsis

Abstract

A study has been made of the tryptic inhibitory activity of leaf protein concentrate (LPC) prepared from several crops. The highest level of inhibition was found in LPC extracted from lucerne (50%), compared with that from fescue, Italian ryegrass and quinoa, which contained about 20% tryptic inhibitory activity. No inhibitory activity was found in kale LPC when measured under the defined conditions. Aqueous extraction of LPC decreased inhibitory activity, but solvents (propan‐2‐ol and acetone) were ineffective. The inhibitory activity in lucerne LPC was reduced by autoclaving, but the inhibitors in fescue, Italian ryegrass and quinoa were heat stable. Phenolic compounds were implicated in the inhibitory activity of fescue and Italian ryegrass LPC. Kinetic studies of the inhibitory activity of standard LPC samples prepared from Italian ryegrass, fescue and quinoa indicated that, in each instance, there was mixed inhibition.

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