Role of proline and hydroxyproline in N-nitrosamine formation during heating in cured meat.
N-Nitrosamines are formed in a multi-step reaction of nitrite with free amino acids and amines in the meat products. The aim of this study was to determine the role of proline and hydroxyproline in N-nitrosamines formation during heating of cured meat. A lean meat model was used with different nitrite concentrations (0, 120, and 480mg/kg), and addition of proline and hydroxyproline (1000mg/kg), followed by heating at different temperatures. Volatile nitrosamines were analyzed with GC-TEA. The nitrosamine content never exceeded 10μg/kg and stayed <LOQ as long as the nitrite level of 120mg/kg was not surpassed. The importance of proline as a precursor for N-nitrosamine formation was confirmed. In contrast, hydroxyproline inhibited NPYR formation (N-nitrosopyrrolidine) because no traces were found after addition of hydroxyproline. NPYR formation was not related to nitrite, but was significantly influenced by temperature (⩾200°C) and proline. NDMA-presence (N-nitrosodimethylamine) in heated meat products was influenced by nitrite and temperatures >120°C.
Drabik-Markiewicz
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G
Laboratory for Food Chemistry and Meat Technology, KaHo Sint-Lieven, Technology Campus, Gebroeders Desmetstraat 1, 9000 Gent, Belgium; The University of Silesia, Institute of Chemistry, 9 Szkolna Street, 40-006 Katowice, Poland.
Van den Maagdenberg
K
K
Laboratory for Food Chemistry and Meat Technology, KaHo Sint-Lieven, Technology Campus, Gebroeders Desmetstraat 1, 9000 Gent, Belgium.
De Mey
E
E
Laboratory for Food Chemistry and Meat Technology, KaHo Sint-Lieven, Technology Campus, Gebroeders Desmetstraat 1, 9000 Gent, Belgium.
Deprez
S
S
Laboratory for Food Chemistry and Meat Technology, KaHo Sint-Lieven, Technology Campus, Gebroeders Desmetstraat 1, 9000 Gent, Belgium.
Kowalska
T
T
The University of Silesia, Institute of Chemistry, 9 Szkolna Street, 40-006 Katowice, Poland.
Paelinck
H
H
Laboratory for Food Chemistry and Meat Technology, KaHo Sint-Lieven, Technology Campus, Gebroeders Desmetstraat 1, 9000 Gent, Belgium.