glycating

Glycation, or glycating reactions, are non-enzymatic chemical processes in which reducing sugars react with nucleophilic sites—most commonly amino groups on proteins, lipids, or nucleic acids. This contrasts with enzymatic glycosylation, which is a regulated post-translational modification. Glycation begins when a reducing sugar such as glucose or ribose forms a reversible Schiff base with a free amino group, often on lysine residues or the N-terminus of proteins. This rearranges to a more stable Amadori product and can undergo further oxidation, dehydration, and fragmentation to yield advanced glycation end products (AGEs).

AGEs can accumulate in tissues over time, especially under conditions of high glucose or oxidative stress, and may cause crosslinking of proteins, altered enzymatic activity, and disrupted receptor interactions. In humans, glycated hemoglobin (HbA1c) is routinely measured as an index of average blood glucose over the previous two to three months; higher levels reflect poorer glycemic control and are linked to complications of diabetes and aging.

Glycation also occurs in foods during heating and processing, as part of the Maillard reaction, contributing to aroma, flavor, and color; dietary AGEs may influence circulating AGE levels and inflammation in some contexts.

Research areas include the study of AGE receptors (RAGE), the role of glycation in vascular and renal disease, and the development of compounds that inhibit or reverse AGE formation. Preventive strategies emphasize glucose control, antioxidant intake, and, in some experimental settings, pharmacological inhibitors.