Study on functional properties of protein-rich composite flour utilizing foxtail millet and flaxseed

Abstract

The residue after extraction of oil from flaxseed contains many nutrients and bioactive components, though it is not used that much in the development of food. On the other hand, foxtail millet is a non-conventional source of food, which can be a supplement of wheat flour or flour-made products. The objective of this work is to incorporate flaxseed oil cake into the common food with a non-conventional source of flour and also to check the functionality of differently pre-processed foxtail millet. In utilizing oil industry waste, i.e., de-oiled flaxseed, for developing a value-added product, the concept of green technology was applied. Flaxseed (Linum usitatissimum) oil cake flour was mixed in a 1:1 ratio with Foxtail millet (Setaria italica) flour, prepared in three forms: raw, germinated, and microwave treated. The study mainly focused on utilizing the non-thermal processes to investigate the functional properties of the flour blends. Also, an analysis of functionality among three forms of foxtail millet has been done in this study. The mixed flours were further evaluated for nutrient composition and functionality. The results of the developed flour blends are compared with the conventional wheat flour and raw foxtail millet flour to determine the importance of Oil Cake Waste and pre-processing of Millet. The functional properties of mixed flour increased compared with raw foxtail millet flour.