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Agriculture, Vol. 26 No. 2, 2020.

Original scientific paper

https://doi.org/10.18047/poljo.26.2.1

PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITY OF THE CROATIAN RED CLOVER GERMPLASM COLLECTION

Daniela Horvat ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Marijana Tucak ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Marija Viljevac Vuletić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Tihomir Čupić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Goran Krizmanić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Marija Kovačević Babić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia

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Abstract

The leaf samples of two varieties, twenty breeding populations, and seven local populations of the Croatian red clover were collected in the full flowering stage, with an aim to evaluate their phenolic content and antioxidant activity by using the spectrophotometric methods. A significant variation among the varieties/populations in the content of total phenolics and flavonoids was determined. The results demonstrated that the red clover is a rich source of phenolics and flavonoids, ranging from 38.67 to 59.96 mg GAE/g of DM and 21.19 to 51.48 mg CE/g of DM, respectively. The high levels in both phenolics and flavonoids were found in breeding populations/variety CD-8, Rc-11/7, Rc-11/8, Rc-11/15 and OS Osiris. The leaf extracts manifested a strong antioxidant activity towards diphenyl-1-picrylhydrazyl (DPPH), with a variation from 31.50 to 63.14%. A significant correlation was found between the antioxidant activity of the extracts and their total phenolic and flavonoid content (r = 0.737 and 0.839, respectively). Considering the obtained results, the crude extracts of red clover manifested a significant antioxidant potential and can be used as a natural source of biologically active components in the human and animal nutrition.

Keywords

red clover (Trifolium pratense); total phenolics; total flavonoids; antioxidant activity; DPPH

Hrčak ID:

247719

URI

https://hrcak.srce.hr/247719

Publication date:

14.12.2020.

Article data in other languages: croatian

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