Polyphenol contents and antioxidant activity of Maydis stigma extracts
Authorized Users Only
Article (Published version)
MetadataShow full item record
The antioxidant activity and contents of various polyphenol classes in the silks of fifteen maize hybrids with economic importance in Serbia were evaluated. Total polyphenols, tannins and proanthocyanidins were determined spectrophotometrically, after extraction of plant material with 70% aqueous acetone under sonication at room temperature. In addition, flavonoid content was determined. Antioxidant activity of aqueous acetone extracts. was evaluated by FRAP assay. A positive linear correlation between antioxidant activity and contents of all investigated polyphenol classes was established. The highest antioxidant activity was observed in the extract of NS 640 hybrid, which had high levels of all polyphenol classes examined. Results suggested strongly that polyphenol content should be considered as an important feature of the herbal drug Maydis stigma. For that reason, the biological source of this herbal drug needs to be more precisely defined, as observed activities and polyphenol co...ntents were greatly dependent on plant material source.
Keywords:maize silk / Maydis stigma / Zea mays / antioxidant activity / FRAP assay / polyphenols
Source:Bioresource Technology, 2005, 96, 8, 873-877
- Elsevier Sci Ltd, Oxford