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Determination of Optimised Malting Conditions for the Enrichment of Rutin, Vitexin and Orientin in Common Buckwheat (Fagopyrum esculentum Moench)
Author(s) -
Krahl M.,
Back W.,
Zarnkow M.,
Kreisz S.
Publication year - 2008
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.2008.tb00772.x
Subject(s) - orientin , vitexin , rutin , chemistry , fagopyrum , isoorientin , quercetin , food science , botany , flavonoid , biochemistry , biology , antioxidant
Buckwheat ( Fagopyrum esculentum Moench) is known to be an excellent source of polyphenols. In this study, common dehulled buckwheat was malted and the changes in the flavonoid content of the kernels were measured. In order to determine optimum malting conditions for the enrichment of rutin (quercetin‐3‐rutinoside), vitexin (apigenin‐8‐glucosid) and orientin (luteolin‐8‐glucosid), malting parameters were varied according to a statistical model. Using this central composite design helped to determine optimum parameters. Numerical optimised malting parameters were a germination temperature of 22°C and a germination time of 7 days and the resulting moisture content in the kernels was 61%. Using these parameters the calculated rutin content increased from 13.8 mg/100 g (d.w.b. [dry weight basis]) to 105 mg/100 g (d.w.b.). Vitexin and orientin could not be found in the unmalted kernels and concentrations in malt reached 87 g/100 g (d.w.b.) for orientin and 96 mg/100 g (d.w.b.) for vitexin.