Citric Acid → (+)-Lactose

Beteiligte Stoffe

Reaktionsschritte

A solution of 0.2 mg of bovine pancreatic insulin (Wako Pure Chemical Industries, Itd.) in 1 mL of a 2 mmol/L aqueous solution of hydrochloric acid, a solution of 320 mg of anhydrous β-lactose (Nacalai Tesque, Inc.) in 2 mL of distilled water, and 1 mL of a 200 mmol/L phosphate buffer (pH 8.4) were mixed in a test tube. The mixture was subjected to reaction at 40° C. for 24 hours. To 3 mL of the resulting solution was added 0.5 mL of a 150 mmol/L aqueous solution of citric acid to adjust the pH to 5.0, and the mixture was subjected to reaction at 40° C. The reaction mixture was intermittently sampled and analyzed for products obtained by the reaction of insulin with lactose by HPLC in a manner similar to that in Example 1. The results are shown in Table 5.

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