Data on the in-vitro digestibility of acid gels prepared from brewers' spent grain protein isolates

Brewers' Spent Grain (BSG) is the primary waste of the beer brewing process, which comprises a plethora of nutritionally appealing ingredients such as proteins, dietary fibres, essential lipids and micronutrients. In our previous study [1], the acid-induced gelation capacity of BSG protein isolate as influenced by the thermal pre-treatment severity was systematically investigated. In the present work, we aimed at providing a dataset outlining the gastrointestinal fate of the acid gels under simulating pre-absorptive digestion conditions adopting the INFOGEST static in-vitro digestion protocol. Protein hydrogel digestibility was assessed by quantification of the total soluble nitrogen content in the initial acid gels as well as the obtained gastric and small intestine chymes. The extent of proteolysis occurring in the oral, gastric and intestinal phases was investigated by SDS-PAGE and the molecular weight distribution of the proteins in the obtained gastric chymes and intestinal digesta was determined by image analysis. The dataset can be deployed to assist food scientists in the design and development of alternative protein-based food and food supplement products adopting the "waste-to-fork" concept.