Evaluation of HPLC Profile, Antioxidant, Quorum Sensing, Biofilm, Swarming Motility, and Enzyme Inhibition Activities of Conventional and Green Extracts of Salvia triloba

Abstract

The current study aims to prepare a green extract using a new method in addition to conventional extraction methods including; methanolic and ultrasonic extraction of Salvia triloba, to compare their phenolic composition utilizing high‐performance liquid chromatograph equipped with a diode array detector (HPLC‐DAD), anti‐bacterial, anti‐oxidant, and enzyme inhibition activities. The results of HPLC‐DAD analysis showed that Rosmarinic acid was found the highest amount in the methanolic extract followed by ultrasonic and green extracts as 169.7 ± 0.51, 135.1 ± 0.40, and 28.58 ± 0.46 μg/g respectively. The Trans‐cinnamic acid (4.40 ± 0.09 μg/g) was found exclusively in ultrasonic extract. For bioactivities, the green extract exhibited the highest biofilm inhibition against Enterococcus faecalis compared to other extracts, while the methanolic extract outperformed both ultrasonic‐assisted and green extract against Staphylococcus aureus and Escherichia coli strains at minimum inhibitory concentration. The methanolic and green extract exhibited considerable quorum sensing inhibition against Chromobacterium violaceum CV026, while no activity was recorded from ultrasonic‐assisted extract. The methanolic and ultrasonic‐assisted extracts of S. triloba recorded moderate butyrylcholinesterase inhibition; each extract demonstrated limited inhibitory effects on the urease enzyme. Similarly, each extract of S. triloba demonstrated significant antioxidant activity, with the highest activity exhibited by methanolic extract as β‐carotene‐linoleic acid assay (IC50 = 10.29 ± 0.36 μg/mL), DPPH• assay (IC50 = 27.77 ± 0.55 μg/mL), ABTS•+ assay (IC50 = 15.49 ± 0.95 μg/mL), metal chelating assay (IC50 = 57.80 ± 0.95 μg/mL), and CUPRAC (assay A0.50 = 32.54 ± 0.84 μg/mL). Furthermore, the methanolic extract exhibited antioxidant activity better than α‐tocopherol (Standard used). The current study demonstrated the potential of green solvent(s) as eco‐friendly alternative for extractin phenolic compounds from S. triloba and evaluated their biological activities for the first time.