Comparison of flavonoid contents in the red-stem and green-stem Persicaria odorata extracts analysed by HPLC method

There are two different types of P. odorata (Lour.) Sojak ( Polygonaceae) found in Thailand, the red-stem and green-stem ones which our previous report suggested promote in vitro antioxidant activities with inhibitory effects against α-glucosidase and α-amylase enzymes. There is only report on essential oils analyses but no report on phytochemicals in their leaves and stems. Therefore, this study was conducted in order to quantitatively analyse the major chemical constituents in the leaf and stem extracts from the red- stem and green-stem P. odorata samples. A high performance liquid chromatographic (HPLC) method was optimised, validated and used. Phenolics and flavonoids including gallic acid, scutellarin, quercetin and kaempferol were major compounds in P. odorata extracts. Scutellarin was found in the highest amounts in the leaves (4.81±0.05 and 1.59±0.01 g in 100 g extract for red-stem and green-stem leaf extracts, respectively) while it was found in very low amounts in both coloured stems. In the green-stem stem extract, only gallic acid could be detected in a low amount (0.56±0.00 g in 100 g extract). The red-stem P. odorata extracts significantly contained higher amounts of all phytochemicals than the extracts from green- stem samples while the leaf extracts contained higher amounts of all compounds than the stem extracts. The results suggest the leaves of red-stem P. odorata as raw materials with high amounts of phytochemicals that could be useful for further pharmaceutical and medicinal applications in the future.

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Artikel online veröffentlicht:
16. November 2023