C24 Determination of the phytochemical profile and anti-oxidant capacity of the roots of Beta vulgaris (Chenopodiaceae)

Résumé

Introduction: Chronic inflammation due to oxidative stress plays an essential role in the pathogenesis of chronic diseases like cardiovascular diseases. Regular consumption of fruits/vegetables known as medicinal plants are considered as fundamental approach in treating non communicable diseases like hypertension. These is achieved through secondary metabolites contained in the above-mentioned plants.

Objective: To determine the phytochemical profile and anti-oxidant capacity of the roots of Beta vulgaris (Chenopodiaceae).

Methodology: Qualitative phytochemical analysis was carried out according to Harbone and Evans principles. Total polyphenol content was assessed according to Li et al, total flavonoid content was assessed according to Zhishen et al and total tannins content was measured according to Julkumen-Titto. Antioxidant capacity were performed in vitro using the DPPH tests (radical scavenging) according to Blois and Ferric Reducing Ability of Plasma (FRAP) according to Benzie and strain. All tests were performed in triplicates at 1500μg/mL. The type of antioxidant ability (primary or secondary) was assessed.

Results: The phytochemical analysis of the raw root of Beta vulgaris revealed the presence of polyphenols, flavonoids, alkaloids and terpenes. Total polyphenol, flavonoids and tannins content was 18,56±1,0, 31,19±3,12 572,84±54 mg of catechin, quercetin and tannic acid equivalent/gram dry matter respectively. Antioxidant tests revealed radical scavenging activity with DPPH whose SC50 was 108.2

μg/mL against 302.5 μg/mL for gallic acid and FRAP (chelating antioxidant) activity at 1089.14±99.23 mg catechin equivalent per gram of dry matter. The antioxidant ability was secondary (preventive).

Conclusion: Beta vulgaris possess the three main group of secondary metabolites and secondary antioxidant activity.