3-MCPD and Glycidyl Esters in Edible Oils: What Are They and Why Do They Matter?

3-MCPD esters and glycidyl esters are process contaminants that can form during high-temperature refining. They should be discussed by separating hazard from exposure and risk.

Industrial refining includes high-temperature deodorization under vacuum. Under certain precursor and process conditions, this can promote formation of 3-MCPD fatty-acid esters and glycidyl esters. FDA notes that the highest concentrations are often found in refined palm oil and palm olein, although other refined oils can also contain them.

During digestion, 3-MCPD esters can release 3-MCPD and glycidyl esters can release glycidol. Animal toxicology is an important basis for risk assessment.

A hazard tells us a substance can cause harm under some conditions. Exposure asks how much is actually consumed. Risk combines hazard with exposure. Detecting a contaminant analytically does not by itself establish that an individual faces a meaningful health risk.

Everyday Lipid takeaway 3-MCPD esters and glycidyl esters are real process-contaminant concerns and deserve control, but they should be discussed using exposure-based risk assessment—not the simplistic message that any detectable amount makes an oil “toxic.”

References - U.S. FDA. 3-Monochloropropane-1,2-diol (MCPD) Esters and Glycidyl Esters. - EFSA. Risk assessments and updates on 3-MCPD and glycidyl esters in food.