Biphenyl-4-carboxylic acid

Biphenyl-4-carboxylic acid (CAS 92-92-2) is an aromatic organic acid derived from the biphenyl scaffold, carrying a carboxylic acid group at the 4-position. It is also referenced under the names 4-Carboxybiphenyl, 4-Carboxydiphenyl, and NSC 23040. No E-code designation applies to this substance.

In pharmaceutical and personal care formulations, the compound acts as an antimicrobial preservative by disrupting microbial membrane integrity at low concentrations. In polymer and coating systems, it functions as an antioxidant stabilizer and pH buffer, helping to control degradation reactions during processing and extending shelf stability of the finished material.

Biphenyl-4-carboxylic acid is supplied as a crystalline powder and sourced to meet REACH compliance requirements for the European market. Procurement teams should confirm applicable grade specifications against internal quality standards, as FCC or Ph.Eur. monographs do not currently cover this substance. Standard packaging formats vary by supplier volume tier.