Alteration of biochemical parameters and microstructure of Fagopyrum esculentum Moench grain in process of germination
DOI:
https://doi.org/10.5219/932Keywords:
Fagopyrum esculentum Moench grain, germination, vitamins, peptide composition, carbohydrate composition, microstructure, antioxidant activityAbstract
Biochemical parameters alteration of Fagopyrum esculentum Moench grain in process of germination was studied. It was found that during germination of Fagopyrum esculentum Moench grain within 24 hours the content of ascorbic acid, thiamine, nicotinic acids, pantothenic acids and routine was increased. The peptide composition of Fagopyrum esculentum Moench grain was studied by gel electrophoresis. The most significant alteration of reserve globulins structure are observed during germination phase from 20 till 24 hours. New low-molecular polypeptides appear during above mentioned period, that indicates embryonic awakening and synthesis of new protein compounds, mainly hydrolases. The process of proteolysis during germination of Fagopyrum esculentum Moench grain promotes a content increase of soluble fractions and sum of albumins and globulins. There is a significant decrease of insoluble protein residue during germination phase change. Chromatographic method was used to determine the change of carbohydrate composition of Fagopyrum esculentum Moench grains during germination. It was established that the content of total carbohydrates amount in grain extracts increases. Electron scanning microscopy revealed that after 12 hours germination of Fagopyrum esculentum Moench grain, swelling of starch grains and minor damage of their packaging in endosperm are observed. After 24 hours, endosperm of germinated grain significantly changed microstructure: starch grains and components of protein matrix had a vague outline, grain disintegration was observed. Evaluation of antioxidant activity of alcohol extract from Fagopyrum esculentum Moench grain germinated during 24 hours showed that percentage of DPPG free radicals inhibition increases with process prolongation. Thus, Fagopyrum esculentum Moench grain germinated within 24 hours is characterized by a high content of biologically active substances and can be used in food technologies for functional products development.
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