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Table 2 Qualitative detection and antimicrobial activity of Gymnema sylvestre leaves

From: In vitro antimicrobial potential of extracts and phytoconstituents from Gymnema sylvestre R.Br. leaves and their biosafety evaluation

Phytoconstituents Detected group Stock solution (mg/ml) Antimicrobial activity
Alkaloids   31 ++ d
 Mayer’s reagent test +b   
 Hager’s reagent test +   
 Wagner reagent test +   
Flavonoids   52.25 +++c
 Shinoda test (Magnesium turnings) -a   
 Zinc–hydrochloride reduction test +   
 Lead acetate test +   
 Ferric chloride reagent test +   
Saponins   50 ++d
 Froth test +   
Tannins   142.3 -f
 Ferric chloride reagent test +   
 Lead acetate test +   
Cardiac glycosides   54.65 +++c
 Keller-killiani test +   
Terpenoids    
 Triterpenes (Salkowski’s test) NA
 Diterpenes (Copper acetate test) + 44.4 ++d
Anthranol glycosides    
 Borntrager’s test + ND NA
Phytosterols   57.6 +e
 Libermann Burchard’s test +   
 Salkowski’s test +   
Coumarins + ND NA
  1. NA not applicable, ND not done
  2. aAbsent, b present, c most active, d active, e least active, f not active