How Pullulanase Affects Resistant Starch and Antioxidant Activity in Purple Sweet Potato Powder?

Gita Nevara Addelia, Shyan Yea Chay, Kharidah Muhammad, Hasanah Mohd Ghazali, Roselina Karim


Purple sweet potato (PSP) serves as a potential source for dual functionalities of resistant starch (RS) and antioxidants. This study aims to evaluate the effects of pullulanase enzyme on these functionalities. Results showed that the incorporation of pullulanase into PSP powder could significantly increase the RS content from 3.06 g/100g to 7.11 g/100g. However, total anthocyanin content and DPPH radical scavenging activity reduced significantly, due to the interference from RS fragments on anthocyanins. Securing both functionalities (RS and antioxidant) within the same sample is seemingly impossible. A compromise between RS and antioxidant properties in coloured, starchy plant powders is recommended.


Anthocyanin; Antioxidant; Pullulanase; Resistant starch; Sweet potato

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ISSN: 2148-127X

Turkish JAF Sci.Tech.

Turkish Journal of Agriculture - Food Science and Technology (TURJAF) is indexed by the following national and international scientific indexing services: