Figure 1From: Medicines informal market in Congo, Burundi and Angola: counterfeit and sub-standard antimalarialsChromatographic profiles of tablets sample Qb5, purchased as quinine, 300 mg, from Burundi (A), of quinine sulphate standard (B) and of chloroquine diphosphate standard (C). The retention time and the UV-absorption spectrum recorded in the peak apex (reported in the inset), clearly indicates that the sample is chloroquine.Back to article page