Inter-laboratory Validation Studies of Biological Method for Determination of Streptomycin in Royal Jelly

Abstract

Inter-laboratory validation studies were conducted in 6 laboratories to validate the biological method for determination of streptomycin in royal jelly. Streptomycin spiked at the level of 0.2 and 1.0 ppm was analyzed. Mean recoveries were 89 and 96%, reproducibility relative standard deviations (RSD_R) were 15.0 and 14.0%, HORRAT_R values were 0.7 and 0.9. Samples containing residues at the levels of 0.25 and 0.80 ppm were analyzed. Mean recoveries were 113 and 99%, RSD_R were 15.0 and 10.4%, and HORRAT_R values were 0.8 and 0.6. The determination limit was 0.1 ppm. These results show that this method has good performance.