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3 results
Antioxidant activity profiling by spectrophotometric methods of aqueous methanolic extracts of Helichrysum stoechas subsp. rupestre and Phagnalon saxatile subsp. saxatile.
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OBJECTIVE
The aqueous methanolic extracts of two plants from Algeria, Helichrysum stoechas subsp. rupestre and Phagnalon saxatile subsp. saxatile, were investigated for their antioxidant activity.
METHODS
Total phenolics, flavonoids, and tannins were determined by spectrophotometric techniques. In
Phenolic glycosides from Phagnalon rupestre.
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Analysis of the butanol-soluble fraction from the methanolic extract of the aerial parts of Phagnalon rupestre (Asteraceae) has led to the isolation of seven phenolic compounds. Three have been identified on the basis of their NMR spectra as new natural compounds: the lignan
Phagnalon rupestre as a source of compounds active on contact hypersensitivity.
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The effect of Phagnalon rupestre MeOH extract on dinitrofluorobenzene- and sheep red blood cells-induced hypersensitivity was investigated. Eight compounds were identified: three dimethylallyl-hydroquinone glucosides (1 - 3), 3,5- and 4,5-di-O-caffeoylquinic acid methyl esters (4 and 5), their free
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