By the end of fermentation, the α-amylase การเกิดปฏิกริยา in แกนนูด fermented by single การเพาะเลี้ยง were, in average, between 50.5 and 69.2 CU · 100 g− 1 in RS and between 47.1 and 73.7CU · 100 g− 1 in RSPF gruels (Fig. 2A and B). Even lowering the time to achieve pH 4.5, passion fruit fiber increased significantly the α-amylase การเกิดปฏิกริยา of single cultures of L. plantarum and of L. acidophillus, but the mechanism of this positive effect remains unclear and requires further studies. The enzymatic การเกิดปฏิกริยา was also higher in RSPF แกนนูด fermented by L. fermentum but, regarding its curve of α-amylase การเกิดปฏิกริยา ( Fig. 2B), this effect can be due rather to the increase in the fermentation time promoted by passion fruit fiber (Table 1) than to a direct effect of the fiber on the การเกิดปฏิกริยา or production of the enzyme. However, the lower final α-amylase การเกิดปฏิกริยา in RSPF fermented by L. casei can be associated to the shorter fermentation time induced by the passion fruit fiber ( Table 1, Fig. 2B).