Inteaz Ali
McGill University, Canada
Title: Process for preparing protein concentrates from brewer's spent grain
Biography
Biography: Inteaz Ali
Abstract
A method of preparing protein concentrate from brewers' spent grain comprises extracting said brewer's spent grain with sodium dodecyl sulfate to solubilize the protein thereof, and thereafter removing a substantial proportion of the protein in solution. The principal by-product of the brewing industry is brewer's spent grain (hereinafter referred to as BSG). The composition of BSG is approximately as follows: Table A Component% (dry weight basis) Moisture 7.41 Crude Protein 26.88 10 Crude Fat 8.07 Ash 4.71 Fiber 16.25 Nitrogen Free Extract 44.09 It will be seen, therefore, that protein is a major constituent of BSG, and potentially a rich source of food. Several proposals have been made in the past for recovery of this protein. For instance, in The Molson Companies Limited's U.S. Patent No. 4,315,038, dated February 9, 1982, it is disclosed that protein can be extracted from trub by extraction with an azeotropic mixture of isopropanol and water. In an article by three of the present inventors (Crowe, Alli and Baker) in the Journal of the Institute of Brewing, Vol. 91, p.l48-150, titled Solubilization of Nitrogenous Constituents of Brewer's Spent Grains, it is disclosed that up to 50% of the Nitrogen from BSG solubilized by an acid detergent (cetyl-trimethyl ammonium bromide in sulfuric acid - capable of solubilizing 90~ of BSG nitrogen) can be recovered as a solid. ~L317~13 The object of the present invention is to provide a fairly inexpensive but efficient method of preparing a protein concentrate from BSG.