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Table 2 Phytochemical constituents in crude extract of P. hydropiper

From: Heavy metals analysis, phytochemical, phytotoxic and anthelmintic investigations of crude methanolic extract, subsequent fractions and crude saponins from Polygonum hydropiper L

S. no Phytochemical class Test performed Observations Results
1 Alkaloids Dragendorff’s Test Turbidity/precipitation +
2 Flavonoids Ferric chloride test Formation of yellow color which changed to colorless on acid addition +
3 Saponins Froth Test 1. Stable froth formation +
2. Emulsion formation after olive oil +
4 Tannins Gelatin Test appearance of white precipitate +
5 Steroids Liebermann Burchard test green to pink color was absent -
6 Glycosides Keller Killiani Lower reddish brown layer & upper acetic acid layer which turns bluish green +
7 Anthraquinones Bontrager’s test Formation of red, violet or pink color f in aqueous layer +
8 Triterpenoids Liebermann Burchard test Appearance of reddish brown-deep red color +
  1. +; Phytoconstituent present -; Phytoconstituent Absent.