THE PREPARATION OF ENZYME-RESISTANT PYRODEXTRIN FROM RICE STARCH BY PYROLYTIC REACTION WITH ACID CATALYSTS
Keywords:acid catalysts, indigestible dextrin, physicochemical property, pyrolysis, rice starch
The aim of this study was to obtain appropriate technological parameters of acid-catalytic pyrolysis to synthesize resistant dextrin from rice starch. Hydrochloric acid has the highest catalytic efficiency of the four tested acids (acetic, citric, lactic, and hydrochloric). With HCl catalyst, pyrodextrins have content of indigestible fraction (IDF), water solubility and whiteness reaching 70.82%, 96.73% and 64.27% respectively. An appropriate condition for pyrolysis of rice starch of IR50404 variety has been determined, including: 0.15% HCl catalyst in starch, pH 2.3 ÷ pH 2.5, pyrolysis temperature 170oC, duration less than 2 h (depends on starch pH and heating device) in order their whiteness to reach 60 ÷ 65%. The pyrolysis applied at a pilot-scale of 8 kg/batch with identified technological parameters showed no significant difference in pyrodextrin quality between production batches and gained about 94% compared with the small laboratory scale. The final product contained 66.56% IDF, 59.63% TDF (total dietary fiber), dextrose equivalent 4.87, and 98.14% water solubility.
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