Comparison of Total Phenolic Contents and Antioxidant Activities of Different Parts of the Endemic Plant Geranium ibericum subsp. jubatum

Abstract

This paper includes the results of the first study on the phenolic content and antioxidant capacity of endemic species Geranium ibericum subsp. jubatum found in Turkey. In this study, the methanol extracts of different parts (leaf, stem, flower, and root) of the Geranium ibericum subsp. jubatum exhibited different free radical scavenging activity, total phenolic content, and antioxidant activity. The synthetic antioxidant BHT and the natural antioxidant α-tocopherol were evaluated as a positive control and compared with methanol extracts of the plant parts. There was a positive correlation between the total phenolic content and the free radical scavenging activity in different parts of Geranium ibericum. It has been found that the highest phenolic content and antioxidant activity were found in the roots. The total phenolic content and antioxidant activity (ABTS, DPPH) showed statistically significant differences among the different parts of the G. ibericum subsp. jubatum (p<0.05).