DefinePK

Abstract

Gayam seed Inocarfus fagifer Forst. has a high amylose content and is a good source of resistant starch RS. Pre-gelatinization during the preparation of gayam flour can increase the RS content, which is associated with a lower glycemic index GI. The objective of this research was to study the changes in both the RS content and GI of gayam flour with pre-gelatinization treatment. Pre-gelatinized gayam flour was prepared from unpeeled gayam seed that was boiled at 100C for 15, 30, or 45 min. The results showed that the RS contents of pre-gelatinized gayam flour by dry weight analysis boiled for 0, 15, 30 and 45 min were 15.780.99, 16.950.54, 17.061.10 and 17.920.39, respectively. The RS content of pre-gelatinized gayam flour boiled for 15 and 30 min did not differ significantly compared with the control, whereas pre-gelatinization for 45 min produced the highest RS content. Using glucose as the reference food, the GI values of pre-gelatinized gayam flour boiled for 0, 15, 30 and 45 min were 74, 75, 61 and 57, respectively. Thus, a longer pre-gelatinization time can produce a lower GI value for gayam flour, which is associated with an increased RS content.

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