Native jackfruit seed starch (JFS) contains 30% w/w type II resistant starch (RS2) and can potentially be developed as a new\ncommercial source of RS for food and pharmaceutical application. Heat-moisture treatment (HMT) was explored as a mean to\nincrease RS content of native JFS. The effect of the conditions was tested at varied moisture contents (MC), temperatures, and\ntimes. Moisture levels of 20ââ?¬â??25%, together with temperatures 80ââ?¬â??110?C, generally resulted in increases of RS amount. The highest\namount of RS (52.2%) was achieved under treatment conditions of 25% MC and 80?C, for 16 h (JF-25-80-16). FT-IR peak ratio at\n1047/1022 cm?1 suggested increases in ordered structure in severalHMT-JFS samples with increased RS. SEM showed no significant\nchange in the granule appearance, except at high moisture/temperature treatment. XRD revealed no significant change in peaks\nintensities, suggesting the crystallinity within the granule was mostly retained. DSC showed increases in Tg and, in most cases, ?H,\nas the MC was increased in the samples. Slight but significant decreases in ?T were observed in samples with low RS, indicating\nthat a combination of high moisture and temperature might cause partial gelatinization. HMT-JFS with higher RS exhibited less\nswelling, while the solubility remained mostly unchanged.
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