The Effect of Lactic Acid Fermentation on Extraction of Phenolics and Flavonoids from Sage Leaves
Source abstract
Abstract
This work analysed the effect of spontaneous fermentation of sage leaves on the release and extraction of flavonoid and phenolic compounds. Chemical profiling based on thin-layer chromatography was used to compare different extracts from two sage species, common sage (Salvia officinalis) and white sage (Salvia apiana). Non-fermented Salvia apiana extracts are richer in antioxidants, phenolics, and terpenoids. Fermentation significantly enhances extraction of total phenolics, flavonoids, and antioxidants only from Salvia officinalis leaves, while it does not affect extraction from Salvia apiana leaves. In each 20 µL of extract, extraction of polyphenolics increases from 6.55 to 21.01 µg gallic acid equivalents (GAE), anti-oxidants from 0.68 to 2.12 µg GAE, and flavonoid content from 48.01 to 65.33 µg RE (rutin equivalents). Higher antioxidant activity in fermented Salvia apiana ethyl acetate extracts is associated with an increased concentration of phenolics and phenolic terpenoids. However, in Salvia officinalis, the higher antioxidant activity of fermented extract is a result of the release and improved extraction of flavonoids, as there is no increase in the extraction of phenolics. Lactic acid produced via fermentation and proline from Salvia officinalis leaves forms a natural deep eutectic solvent (NADES), which significantly increases the solubility of flavonoids.
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Research context
OpenAlex topics: Essential Oils and Antimicrobial Activity · Traditional Chinese Medicine Analysis · Phytochemistry and Biological Activities
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Pharmaceutical and Toxicological Chemistry named after Arzamastsev of the Institute of Pharmacy, I.M. Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia
Department of Pharmacy and Biological Sciences, La Trobe University, Edwards Road, Bendigo 3550, Australia
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