Potentially bioaccessible phenolics, antioxidant activity and nutritional quality of young buckwheat sprouts affected by elicitation and elicitation supported by phenylpropanoid pathway precursor feeding

Abstract

This paper presents the study on impact of elicitation and the phenylpropanoid pathway feeding on the nutritional quality, the potentially bioaccessible phenolics and the antioxidant capacity of young buckwheat sprouts. Phenolics content was increased by elicitation and feeding with tyrosine and shikimic acid – an elevation of 30% and 17%, respectively. Antioxidant capacity was improved by feeding with tyrosine – an increase of 16.7% and 17.1% in both untreated and treated sprouts, respectively. The highest protein digestibility was determined for the control sprouts and those obtained after tyrosine feeding. The lowest starch digestibility was found for elicited sprouts obtained from seeds fed with tyrosine (a decrease by 52%). An increase of expected glycemic index by 38% was determined for elicited sprouts obtained after phenylalanine feeding. Starch and protein digestibility were negatively correlated with total phenolics (r=−0.55 and −0.58, respectively), however starch digestibility was also affected by resistant starch content.