Pasting properties of heat–moisture treated canna starches using different plasticizers during treatment

•Effect of plasticizers (Pz) on heat–moisture treatment of canna starch was studied.•HMT starch using water as a Pz displayed the least change in paste viscosity.•Viscosity of HMT starches decreased as molecular weight of Pz decreased.•Pz content inside granules played a greater role in HMT than the...

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Bibliographic Details
Published in:Carbohydrate polymers 2015-05, Vol.122, p.152-159
Main Authors: Juansang, Juraluck, Puttanlek, Chureerat, Rungsardthong, Vilai, Puncha-arnon, Santhanee, Jiranuntakul, Wittawat, Uttapap, Dudsadee
Format: Article
Language:English
Subjects:
Canna starch
Heat–moisture treatment
Hot Temperature
Hydroxides - chemistry
Ointments
Pasting properties
Plasticizer
Plasticizers - chemistry
Starch - chemistry
Time Factors
Zingiberales - chemistry
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Summary:•Effect of plasticizers (Pz) on heat–moisture treatment of canna starch was studied.•HMT starch using water as a Pz displayed the least change in paste viscosity.•Viscosity of HMT starches decreased as molecular weight of Pz decreased.•Pz content inside granules played a greater role in HMT than the number of OH groups.•Glycerol is a promising plasticizer for HMT of canna starch. Different plasticizers (propanol, propylene glycol, glycerol, erythritol, xylitol and sorbitol) were used for plasticizing canna starch during heat–moisture treatment (HMT). Pasting properties of the modified starches were determined and compared with those of native starch and of HMT starch using water as a plasticizer. Canna starch was soaked in 5% (w/w) plasticizer solutions and adjusted to 25% moisture content before heating at 100°C for 1h. The least change in paste viscosity was found when water was used as a plasticizer. Viscosity of the modified starches decreased as the molecular weight of plasticizers decreased. Plasticizer content in starch granules increased with decreasing molecular weight of the plasticizer, as well as with increased soaking time (from 10min to 4 and 24h). However, pasting profiles of HMT starches prepared by soaking for 4h were comparable to those soaked for 24h, indicating that there was an effective limit of plasticizers. The plasticizer content in starch granules played a greater role in HMT than the number of hydroxyl groups.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.12.074