The Caesalpiniaceae family includes the traditional medicinal plant Cassia angustifolia Vahl. The species is credited with a number of bioactive components, including phenolics, flavonoids, glycosides, coumarins, saponins, terpenoids, and alkaloids, among others, that contribute to a wide spectrum of therapeutic characteristics. The goal of the current study was to investigate the effect of different climatic conditions on total phenolic and flavonoid contents as well as on the antioxidant potential of different parts (root, stem, and leaves) of C. angustifolia. The plants were collected from three different states of India- Rajasthan, Gujrat, and Tamilnadu. Results of the current study showed that the selected plant parts possess significant amounts of total phenols and flavonoids. Our research revealed that methanolic extracts of leaves, roots, and stems from Tamilnadu had the maximum antioxidant activity, followed by Rajasthan and Gujarat. Rajasthan also had the highest levels of phenolic and flavonoid content, which was then followed by Tamilnadu and Gujarat. The results of a one-way ANOVA analysis showed that total phenolic and total flavonoid contents as well as antioxidant potential of the selected plant parts from the various sites were not significantly different. As a result, these plant parts can be utilised in place of harmful synthetic antioxidants and can be employed as natural antioxidants like red wine, green tea, and chocolates etc.
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