Effects of pretreatment and air drying temperature on Noni fruit powder

다국어 초록 (Multilingual Abstract)

The plant Morinda citrifolia L. (Noni) has beenthe subject of several recent research due to its positiveimpact on the treatment and prevention of a variety ofdiseases. Noni fruits contain a variety of phytochemicals,including flavonoid, polyphenol, and triterpenoid saponin.
This study aimed to determine the best pre-treatment (includingblanching, soaking in ascorbic acid solution andmetabisulfite solution) and air-drying temperature (50, 60,70, and 80 C) to maximize the total polyphenol content(TPC), flavonoid content (TFC), and triterpenoid saponincontents (TSC) of the resultant Noni fruit powder. Theresults revealed that pre-soaked Noni fruit samples inascorbic acid or metabisulfite solution before air-drying at60 C were beneficial in preserving TPC, TFC, and TSC.
TPC, TFC, and TSC losses increased as drying temperatures(70 and 80 C) rose. The optimum sample was held atfive different relative humidity conditions until theyattained weight equilibrium. The results indicated that thesorption isotherm curve of the Noni powder was the sigmoidshape and fitted with the BET and GAB models.

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