Formation of peptide-bound Heyns compounds

Area of Science:

• Food Chemistry
• Maillard Reaction Chemistry
• Bakery Science

Background:

• Lysine modification by sugars is crucial in food processing, particularly in bakery products.
• Understanding fructose-induced reactions is key to controlling product quality and safety.

Purpose of the Study:

• To investigate the formation of fructose-induced lysine modifications in bakery models.
• To identify and quantify specific reaction products, such as Heyns and Amadori compounds.

Main Methods:

• Utilized Nalpha-hippuryllysine (BzGK) and fructose in buffered, low-moisture model systems.
• Analyzed reaction products using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) with UV and Mass Spectrometry (MS) detection.
• Examined BzGK reaction in fructose-containing biscuit dough during baking.

Main Results:

• Epimeric Heyns compounds (Nalpha-hippuryl-Nepsilon-glucosyl-lysine and Nalpha-hippuryl-Nepsilon-mannosyl-lysine) were identified in heated BzGK and fructose models.
• The Amadori compound (Nalpha-hippuryl-Nepsilon-fructosyl-lysine) was formed in glucose-containing samples.
• Heyns compounds were detected in baked biscuits, with yields up to 33% in fructose-containing products.

Conclusions:

• Substantial formation of Heyns products is highly probable in fructose-containing bakery goods.
• These findings provide insight into lysine modification during baking, impacting food chemistry and quality.