Abstract
Abstract Quercetin, a member of a large family of polyphenolic compounds, has received remarkable attention due to its overwhelming presence in nutritional supplements. It is believed to have protective effects against several degenerative diseases by preventing lipid peroxidation. In the current study, the estimation of quercetin in methanol extracts of four medicinal plants including Amaranthus cruentus, Berberis calliobotrys, Solanum muricatum and Ribes himalense was made by our developed fluorescence spectroscopic method coupled with PLSR. The results obtained indicated that methanol extract of R. himalense exhibited higher quercetin content (3.83 ± 0.01%) followed by B. calliobotrys (1.91 ± 0.01%), A. eruentus (1.83 ± 0.02%) and S. muricatum (0.87 ± 0.05%). These results were also cross validated with UV–visible spectroscopy and found to be in close proximity to florescence emission method.
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