Chemical substances for use in industry and science, in particular fatty acids, short-chain fatty acids, medium-chain fatty acids, butyrate, caprylate, Propionates and Acetates; Chemicals and organic chemical compositions for use in the manufacture of food, beverages and nutritional supplements, in particular fatty acids, short-chain fatty acids, medium-chain fatty acids, butyrate, caprylate, Propionates and Acetates