Chemical composition, antioxidant properties, and enzyme inhibitory activities of methanol extract from Sideritis montana subsp. montana using ultrasound-assisted extraction

Year 2025, Volume: 12 Issue: 2, 461 - 471

Fatma Özlem Kargın Solmaz , Cengiz Sarıkürkcü

Abstract

Natural products are valuable sources of bioactive compounds with therapeutic potential. This study investigated the chemical composition, antioxidant properties, and enzyme inhibitory activities of the methanol extract from Sideritis montana L. subsp. montana L. obtained via ultrasound-assisted extraction. The extraction yielded 5.37%, with a total phenolic content of 63.27 mg GAEs/g extract and a total flavonoid content of 58.32 mg REs/g extract. Chlorogenic acid (563 µg/g extract), luteolin 7-glucoside (513 µg/g extract), and hyperoside (511 µg/g extract) were the most abundant phenolics. Moderate levels of luteolin and hydroxybenzoic acids were also identified. Antioxidant activity was most pronounced in the phosphomolybdenum assay (428.52 mg TEs/g extract), followed by the CUPRAC (217.40 mg TEs/g extract) and FRAP (171.33 mg TEs/g extract) assays, demonstrating strong reducing power. Radical scavenging assays (DPPH: 122.76 mg TEs/g, ABTS: 140.41 mg TEs/g) showed moderate efficacy, while ferrous ion chelation was weak (6.62 mg EDTAEs/g extract). Enzyme inhibition assays indicated potent α-glucosidase (753.81 mg ACEs/g extract) and α-amylase (274.95 mg ACEs/g extract) inhibition, suggesting antidiabetic potential. Tyrosinase inhibition (68.56 mg KAEs/g extract) points to possible dermatological applications, though acetylcholinesterase (2.08 mg GALAEs/g extract) and butyrylcholinesterase (0.45 mg GALAEs/g extract) inhibition was minimal. The results emphasize the bioactive potential of S. montana subsp. montana. Future studies should explore its bioactivity in vivo and identify synergistic effects among its phenolic compounds to further validate its therapeutic applications.

Keywords

Sideritis montana, Ultrasound-assisted extraction, Phytochemical analysis, Antioxidant activity, Enzyme inhibition

Supporting Institution

Afyonkarahisar Health Sciences University Scientific Research Projects Coordination Unit

Project Number

24.GENEL.022

Thanks

This research was funded by the Afyonkarahisar Health Sciences University Scientific Research Projects Coordination Unit under project number 24.GENEL.022. The authors express their sincere appreciation to Dr. Olcay CEYLAN for his critical role in identifying the plant material used in the study

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