Abstract
This study evaluated the physical parameters, polyphenol profile and antioxidant activity before and after the in vitro digestion of red pitaya powder-enriched oat-wheat bread compared to plain wheat bread, oat-wheat bread and red pitaya powder. The enrichment of red pitaya powder significantly increased the polyphenol, mineral contents, insoluble dietary fibre, firmness and moisture content of oat-wheat bread compared to wheat bread, while contributed to a minor reduction in bread volume and dough extensibility due to gluten dilution. The oat-wheat bread was found to have the lowest predicted glycaemic response, but 5%, 10% and 15% red pitaya powder formulated oat-wheat bread showed a significantly lower glycaemic response than plain wheat bread as well as red pitaya powder.