BSG Chemical engineering Technology: general issues atomic force microscope barley protein biopolymers bread dough quality brewers' spent grain brewing waste by-product valorisation canola capric acid circular dichroism closed-cavity rheometer dietary fiber emulsifying agent enzymatic hydrolysis expansion extrusion fermentation fibre fortification foaming agent food ingredient functional properties gluten network glycaemic index green extraction lup an 1 lupin allergy lupin protein