The invention relates to a method for carrying out
quality control on platycodon grandiflorum (a traditional Chinese
herb) based on bioactivity
assay, which effectively realizes the
quality control on platycodon grandiflorum and ensures the safe and effective clinical application of platycodon grandiflorum. The method comprises the following steps: crushing platycodon grandiflorum, and carrying out ultrasonic extraction on the crushed platycodon grandiflorum by using
ethanol so as to obtain a
dry matter; carrying out multiple proportion diluting on the obtained
dry matter into seven groups by using normal
saline according to an initial concentration at an agent distance of 0.5, thereby obtaining samples; preparing the platycodon grandiflorum into working reference substances according to the sample steps; dissolving
phenol red by using a
sodium bicarbonate solution, then making a
standard curve through taking the
dose of the
phenol red as a x-coordinate and taking an OD (
optical density) value as a y-coordinate; taking animals as experimental objects, grouping the animals, carrying out
drug administration respectively, and putting the animals subjected to
drug administration to death; then taking tracheas of the animals and putting the tracheas into normal
saline, centrifuging and then taking supernate, determining the OD value at a
wavelength of 546 nm, and calculating and comparing the secreted
phenol-red content of the tracheas according to the phenol-red
standard curve; and with the phenol-red content as an index, carrying out
potency calculation. The method disclosed by the invention is easy to operate, stable, reliable, accurate in test and good in
quality control effect, and can provide new ideas and references for the quality control and quality evaluation of other traditional
Chinese herbs with undefined pharmaceutical active substances.