Antioxidant activity of rye caryopses and embryos extracts
Karamac, M. | Amarowicz, R. (Polish Academy of Sciences, Olsztyn (Poland). Div. of Food Science) | Weidner, S. | Abe, S. | Shahidi, F.
Phenolic compounds were extracted with 80 % methanol from caryopses and embryos of rye (cv. Dankowskie Zlote and Amilo). Reducing power, scavenging effect on DPPH radical, and antioxidant activity in a beta-carotene-linoleate model system were examined. The highest concentration of total phenolic compounds was noted in the extract from caryopses of Amilo (7.93 mg/g of extract). UV spectra of all extracts were characterised by maxima originated from phenolic acids (320, 326 and 328 nm), and by maxima at shorter wavelengths (272 and 274 nm) attributed to other phenolic compounds. All extracts showed a good antioxidant activity in a beta-carotene-linoleate model system. This activity was similar to that reported before in leguminous seeds extracts. The antioxidant activities of the extracts from the caryopses of Dankowskie Zlote and the embryos of both cultivars were very similar, especially during the second part of the incubation period. The extract of Amilo embryos showed a slightly weaker antioxidative effect. The weak antiradical effects in the experiments with DPPH radical and a weak reducing power were characteristic for all the extracts investigated.
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