Serum and organ griseofulvin levels in guinea pigs and serum levels in patients who received a prolonged oral administration of griseofulvin were determined gas-chromatographically. In guinea pigs liver showed the highest concentration of griseofulvin, followed by kidney and serum in the decreasing order. The skin levels were 0.16-1.51μg/g with a dose of 30mg/kg. In humans it was proved that griseofulvin did not cause any accumulation in the serum with a dosage of 500mg/day.
A simplified bioassay system for antibiotics has been presented. Glass tubes with open ends and pits are filled with agar medium containing test microbes by immersing vertically into the agar medium while it is warm. These agar tubes are inserted in test solutions and incubated. The growth-inhibitory zones appear in respective tubes due to upward diffusion of the antibiotic. The heights of such zones from the bottom of agar tubes are measured.