Purity tests
Microbiology
The test for Salmonella spp. in Fructus Sennae products should be negative. The maximum acceptable limits of other microorganisms are as follows (15–17). For preparation of decoction: aerobic bacteria-107/g; moulds and yeast-105/g; Escherichia coli-102/g; other enterobacteria-104/g. Preparations for internal use: aerobic bacteria-105/g or ml; moulds and yeast-104/g or ml; Escherichia coli- 0/g or ml; other enterobacteria-103/g or ml.