生乳中蛋白質還原價之調查檢驗

INVESTIGATION ON PROTEIN-REDUCING SUBSTANCE OF RAW MILK

每100毫升牛乳將鐵氰化鉀還原為亞鐵氰化鉀的毫克數，稱為牛乳蛋白還原價（protein reducing substance；PRS）。本省酪農戶之生乳PRS值經調查1208件之結果如下：PRS在2.0～3.9之間者858件，佔總數的71.0％；PRS在1.0～1.9者316件，佔26.2％；PRS在4.0以上者27件，佔2.24％；而0.9以下者7件，僅佔0.58％。又PRS在1.0～13.9之間者有1174件，佔總數的97.2％。 The mg of potassium ferrocyanide reduced from potassium ferricyanide by per 100 ml milk is called milk protein reducing substance (PRS) value. The results of PRS value investigation on 1208 raw milk samples from Taiwan's dairy farmers are as follows: The PRS values of 858 samples, as 71.0%, are between 2.0 and 3.9. The PRS values of 316 samples, as 26.2%, are between 1.0 and 1.9. The PRS values of 47 samples, as 2.24%, are over 4. The PRS values of 7 samples, as 0.58% only, are not over 0.9. However, the PRS value range of 1174 samples, as 97.2%, is between 1.0 and 3.9.