Journal
DRYING TECHNOLOGY
Volume 34, Issue 12, Pages 1462-1470Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2015.1126720
Keywords
Anthocyanin content; antioxidant activity; fluidized bed drying; purple rice; total phenolic content
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Funding
- National Research Council of Thailand
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The influence of drying using a fluidization technique on the quality of purple rice was investigated in this study. The results demonstrated that the initial moisture of rice was 28.3% dry basis (db). Compared to the sun-dried or reference purple rice samples, the influence of drying at temperatures ranging from 100 to 150 degrees C did not affect the quality of color, anthocyanin content, total phenolic content, or antioxidant activity. At this initial moisture level, samples should be dried at 150 degrees C air because such temperatures yield the highest drying rate. Drying at this temperature also causes an increase in the head purple rice yield because of the gelatinization of starch. In the case of an initial moisture content of 33.3% (db), the drying temperature should not exceed 130 degrees C.
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