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Author Chumsri, Paramee
TitleStudies on the optimum conditions for the extraction and concentration of roselle (Hibiscus sabdariffa Linn.)extract/Paramee Chumsri, Anchalee Sirichote and Arunporn Itharat
Imprint2008
Call# FOOD 6313

CALL # Volume Number Month Year Barcode Status
Available

JournalSongklanakarin J. Sci. Technol.
AbstractThe present study aimed to: (a)study the physical and chemical properties of fresh roselle calyxes; (b)study the optimum conditions for water extraction of roselle; and (c)compare the methods of evaporation (vacuum, atmospheric)for processing of concentrated roselle extract. This study found that the L*, a* and b* values of fresh roselle calyxes were 0.09+-0.01, 0.02+-0.01 and 0.05+-0.01. The pH, total acidity and total soluble solids content were 2.16+-0.05, 4.20+-0.01% as malic acid and 5.83+-0.04 degree Brix, respectively. The yields of fresh and dried roselle calyxes production were 47.45+-0.71% and 9.58+-0.77%. The optimum conditions for fresh roselle calyxes, fresh calyxes to water ratio was 1:2, with the extraction temperature of 50 degree C for 30 min. For dried roselle calyxes, the optimum conditions were 1:10 ratio of dried calyxes to water and the extraction temperature of 50 degree C for 30 min. The method of evaporation under the vacuum of 44 cmHg at 70 degree C was an appropriate selected method for both concentrated fresh and dried roselle extracts. The pH, total acidity and total soluble solids contents of concentrated fresh roselle extract were 2.77+-0.02, 12.73+-0.09% as malic acid and 25.07+-0.10 degree Brix, respectively. The total anthocyanin, total phenolic contents and EC subscript 50 (DPPH radical scavenging assay)were 37.67+-0.02 mg/100 g fresh roselle calyxes, 31.26+-0.75 mg gallic acid/g and 39.37+-0.61 mg/ml (n=9). The pH, total acidity and total soluble solids contents of concentrated dried roselle extract were 2.89+-0.05, 11.96+-0.34% as malic acid and 25.07+-0.10 degree Brix. The total anthocyanin, total phenolic contents and EC subscript 50 were 340.97+-0.15 mg/100 g dried roselle calyxes, 31.18+-0.62 mg gallic acid/g and 47.53+-0.85 mg/ml (n=9), respectively.
Descriptvol.30 Suppl.1 ; 133-139
Subjectroselle extract
water extraction
antioxidant activity
concentrated roselle extract
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