FIELD: medicine.
SUBSTANCE: weight portion of raw material is extracted with water while boiling, cooled, filtered, optic density of aliquot sample is measured by wavelength 277 nm, and total content of all tanning substances is calculated by specific formula, further, 1% collagen solution in 1% acetic acid is added to aliquot sample of filtered, shaken, filtered, optic density of filtrate is measured by wavelength 277 nm, and content of precipitated tanning substances is calculated by specific formula.
EFFECT: method makes it possible to increase accuracy of determination of content of tanning substances in plant raw material and to determine selectively precipitated and non-precipitated substances in plant raw material.
2 ex
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