Abstract
Horse Chestnut (Aesculus indica) starch (HCN) was treated with 0.1, 0.25 and 0.5 % (w/v) alkali (NaOH) for 0, 5, and 10 days at ambient temperature (25 °C). Native and alkali-treated starches were characterized for physicochemical, pasting, thermal, morphological and structural properties. The amylose content of the starch decreased after alkali treatment from 26.10 (native) to 13.56 %. Swelling power and solubility increased significantly for treated starch as compared to native HCN starch. Pasting properties of treated starches revealed significant decrease in peak, breakdown and setback viscosity whereas pasting temperature was slightly affected. Gel firmness of native starch was decreased upon treatment from 0.850 to 0.219 N. Thermal properties showed increase in onset, peak and conclusion temperatures at higher concentration of alkali and treatment time. Morphology revealed that the granular shape of starch was affected when treated with higher concentration of alkali. X-ray diffraction of treated starches showed a similar profile but the relative crystallinity decreased with the severity of the treatment from 32.78 (native) to 27.64 %. The effect of alkali on the crystalline structure including short-range ordered structure was not pronounced with a similar trend for all the starches.
Published Version
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