[Spectrophotometric determination of micro-amounts of zinc in Gynostemma pentaphyllum (Thunb.) Makino].
1-(2-pyridylazo)-2-naphthol (PAN) and Emulsifier OP have been used in the colorimetric determination of zinc in Gynostemma pentaphyllum. The results are in agreement with those of atomic absorption spectrophotometry. The method is simple, precise and rapid. The recovery is 97.8-103.7% and coefficient of variation is 1.4-4.6%.
Xie
L
L
Guangxi College of Traditional Chinese Medicine, Nanning.
Huang
Y
Y
D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D013053:Spectrophotometry; D015032:Zinc / Q000032:analysis*
D004365:Drugs, Chinese Herbal; D015032:Zinc