牛乳중 乳糖測定法의 比較試驗

Comparison of the Quantitative Estimations for Lactose in Milk

Lactose in 37 city milk produced by 7 dairy companies were measured by the classical titrimetric methods such as Lane-Eymon or Bertrand method, and the colorimetric method based on the reduction of alkaline solution of potassium ferricyanide to potassium ferrocyanide. There were no significant differences in the lactose contents of tested milk among these quantitative methods as the concentrations of 4.66±0.99% by Lane-Eynon’s method, 4.73±0.12% by Bertrand’s method, and 4.62±0.18% by alkaline ferricyanide method, respectively. Nevertheless, the colorimetric method using alkaline potassium ferricyanide retained the advantages in the accuracy and precision, our the titrimetric method.