Abstract
This study aimed to explore the phytochemical constituents and antioxidant activity of methanol extracts from Sphagnum divinum and Sphagnum girgensohnii. Screening methods were employed to identify the phytochemical groups present in the methanol extracts of these two Sphagnum species, which have been relatively understudied for their antioxidant potential. The antioxidant properties of the extracts were evaluated using in vitro DPPH, CUPRAC, and phosphomolybdate assays. The experimental results revealed that the methanol extract of S. divinum exclusively contained phenols and tannins, while the methanol extract of S. girgensohnii contained phenols, tannins, and saponins. Alkaloids and flavonoids were not detected in either bryophyte. The methanol extracts of both S. divinum and S. girgensohnii exhibited DPPH scavenging activity exceeding 50% at all tested concentrations. An increase in DPPH scavenging ability was observed with increasing extract concentration. The DPPH scavenging activity of S. divinum methanol extract was consistently higher than that of S. girgensohnii methanol extract across all tested concentrations. These findings suggest that S. divinum and S. girgensohnii hold promise as potential sources of antioxidant compounds.
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