E230 - Biphenyl

Origin

Biphenyl, also known as diphenyl or phenylbenzene, is an organic compound with the formula (C₆H₅)₂. It is a colorless crystalline solid with a distinct odor. Biphenyl does not occur naturally to a significant extent, but it is a component of coal tar and crude oil, from which it can be obtained. Industrially, it is produced by the dehydrocyclization of benzene.

Usage

Biphenyl is primarily used as a fungicide to prevent mold and fungal growth on citrus fruits during post-harvest storage and transportation. It is applied as a coating or impregnated into packaging materials. This helps to extend the shelf life of the fruits and reduce spoilage. It also serves as a heat transfer agent, a dye carrier, and an intermediate in the production of various organic compounds, including polychlorinated biphenyls (PCBs), although the latter application has largely been discontinued due to environmental concerns.

Side Effects

While biphenyl is effective as a fungicide, concerns exist regarding its potential health effects. Studies have shown that high doses of biphenyl can cause liver and kidney damage in laboratory animals. In humans, exposure to biphenyl can cause irritation of the skin, eyes, and respiratory tract. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has established an Acceptable Daily Intake (ADI) of 0-0.05 mg/kg body weight. Regulatory agencies monitor biphenyl residues on treated fruits to ensure that consumer exposure remains within safe limits. Some individuals may be more sensitive to biphenyl than others. Always wash treated fruit thoroughly before consumption.

Regulatory Status

The use of biphenyl as a food additive is regulated in many countries. In the European Union, it is permitted for surface treatment of citrus fruit. The United States also allows its use as a fungicide on citrus fruits. Regulations specify maximum residue limits (MRLs) to ensure that consumer exposure is minimized. These limits are regularly reviewed and updated based on the latest scientific evidence.