Abstract
Synthetic pigments that model the organic-soluble pigment in heat-processed cured ham were characterized with infrared (IR) and 15N nuclear magnetic resonance (NMR) spectroscopy. The two pigments synthesized were 15N nitrosyl (protoporphyrinato- IX) iron (II), or FeII PP15 NO, and 15N dinitrosyl (protoporphyrinato-IX), or FeII PP(15NO)2. An NMR spectrum was obtained only for the FeII PP15 NO. The NMR spectrum consisted of a single peak + 1.78 ppm from the Na15 NO3 and –6.8 from the CH3NO2 reference. The IR spectrum included a single NO symmetric stretch at 1801 cm−1. The visible spectrum of FeII PPNO did not match the visible spectrum of ham extracts, while it did with FEII PP(15NO)2. An unequivocal structural assignment of FeII PP15 NO was made, but longer NMR runs may be necessary to obtain a spectrum and unequivocal structural assignment of FeII PP(15 NO)2.
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