One of the commonly used sugars during caramelization is sucrose solution. The brown caramel color produced in its reaction with ammonium bisulfate is used in cola soft drinks, syrups, candies, pet foods and dry seasonings. Solutions of it are acidic with pH ranges from 2-4.5 and with colloidal particles having negative charges. The non-enzymatic browning caramel pigments are large polymeric molecules with complex, uneven, and indefinite structures. It is these polymers that form the colloidal particles. Their rate of formation increases with increasing temperature and pH. (Fennema, 1996)
The diagram below shows a summary of the caramelization process in the experiment “effects of heating to properties of sugar”.(deMan, 1999)
There are three general types of browning, a.) Reaction of ketones and aldehydes among the reducing sugars with amino compounds like amino acids, peptides and proteins. This reaction is not dependent on the presence of oxygen b.) Caramelization which takes place in polyhydroxy carbonyl compounds such as reducing sugars when heated at high
References: Belitz H.D Grosch W. Schieberle P.2009.Food Chemistry. 4th revised and extended ed. Derman, J.M. 1999. Priciples of Food Chemistry. 3rd Edition.USA.Aspen Publishers, Inc. Fennema Owen R.. 1996.Food Chemistry3rd Edition. Marcel Dekker, Inc.