Multi-response surface optimisation of extrusion cooking to increase soluble dietary fibre and polyphenols in lupin seed coat

The seed coat of the legume lupin which is rich in insoluble dietary fibre a major by-product human food applications. Extrusion cooking has been demonstrated to increase desirable soluble Australian sweet coat. In this study, processing condition twin-screw extrusion was optimised using central composite rotatable design from 44.17 g/kg up 113.69 dry basis. high levels polyphenols were retained. optimal conditions achieved maximum fibre, total free phenolic content and individual simultaneously identified validated. largely had no or slight effects on bioaccessibility bioavailability selected minerals polyphenols. cooked could be natural antioxidant source for consumption.