Effect of ascorbic acid on the binding of cloxacillin sodium to bovine serum albumin.

Using dynamic and equilibrium dialysis methods, it has been demonstrated that ascorbic acid (CAS 50-81-7) inhibits the binding of cloxacillin sodium (CAS 7081-44-9) to bovine serum albumin (BSA) in vitro. Normally, ascorbic acid has a lower number of binding sites and a much lower binding constant for BSA than cloxacillin sodium. There is an indication that ascorbic acid inhibits the binding of cloxacillin to BSA through a noncompetitive mechanism. The probable interactions leading to the non-competitive inhibition were suggested.