In bean the LC (lactose 3 %) medium, we could prevent the autolysis produced by oil and increase penicillin potency by the addition of soybean oil and inncrease penicillin potency by the following treatments: 0.1% of acetic acid (pH 6.0, K-salts) was added before the addition of soybean oil. 2. 0.1 to 0.05% of boric acid was added. 3.The initial pH was adjusted to 4.5 to 5.0.
