Abstract
The behavior of different lysine Amadori compounds during acid hydrolysis was investigated in order to determine the molar yield of furosine and the other hydrolysis products. Based on this, the conversion factors for calculating the content of Amadori compound and lysine modification before hydrolysis can be derived. For that purpose, the peptide-bound Amadori compounds Nε-(1-deoxy-D-fructosyl)-, Nε-(1-deoxy-D-tagatosyl)-, Nε-(1-deoxy-D-lactulosyl)- and Nε-(1-deoxy-D-maltulosyl)hippuryllysine as well as free Nε-(1-deoxy-D-fructosyl)lysine were synthesized. For isolation of peptide-bound Amadori compounds, an optimized enzyme-enhanced reversed phase-high pressure liquid chromatography procedure was developed. Pyridosine and Nε-(carboxymethyl)hippuryllysine were synthesized as reference materials. After acid hydrolysis with 6 M hydrochloric acid the, molar yields of furosine were determined to be 32% for fructosyllysine, 34% for lactulosyl- and maltulosyllysine and 42% for tagatosyllysine. Hydrolysis with 8 M hydrochloric acid resulted in a higher yield of furosine for Amadori compounds containing a fructosyl-moiety, 46% for fructosyllysine, 50% for lactulosyllysine and 51% for maltulosyllysine. Compared with this, the molar yield for furosine was not affected by concentration of hydrochloric acid in the case of tagatosyllysine. Based on these conversion factors a reliable calculation of the amount of Amadori compound or lysine modification and with it the evaluation of the progress of the "early" Maillard reaction in foods and biological samples is possible via the quantification of lysine and furosine after acid hydrolysis.
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Acknowledgements
We thank Karla Schlosser and Dr. Horst Nötzold, Institute of Food Chemistry, Technical University of Dresden, for performing the amino acid analyses and Ralf Preuss and Steffen Seifert, Institute of Food Chemistry, Technical University of Dresden, for synthesizing Nε-(carboxymethyl)hippuryllysine. We are grateful to the members of the Institute of Organic Chemistry, Technical University of Dresden, Dr. Dieter Scheller and Annett Rudolf for recording the NMR spectra and the valuable help to interpret them, Dr. Herbert Kroschwitz for acquisition of ESI-MS data and Anke Pertitz for performing the elemental analysis.
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Krause, R., Knoll, K. & Henle, T. Studies on the formation of furosine and pyridosine during acid hydrolysis of different Amadori products of lysine. Eur Food Res Technol 216, 277–283 (2003). https://doi.org/10.1007/s00217-002-0649-0
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DOI: https://doi.org/10.1007/s00217-002-0649-0