It has previously been shown in model systems (Leclère & Birlouez-Aragon, 2001; Masaki, Okano, & Sakurai, 1999) and in biological samples (Murthy & Sun, 2000) that fluorescent products from Maillard reaction have a maximum excitation at wavelengths between 340 and 370 nm, and that the wavelengths of maximum emission are between 420 and 450 nm. The fluorescence from these products is clearly distinguishable from that of tryptophan in proteins (for which the wavelengths for maximum excitation and emission are 290 and 336 nm, respectively). Synchronous fluorescence spectra were thus selected to analyze the samples (Fig. 3B). The wavelengths of maximum emission of fluorescent products were at 370–390 nm and 430–440 nm, which agreed with the above-mentioned range (420–450 nm). However wavelengths between 370 and 390 nm were not detected in the previous papers of the above-mentioned authors. Although the chemical structures of the fluorescent products were only described for a few of those compounds, all the available structures indicated that they always have one or more nitrogen atoms originating from the reactant amino-compounds.
It has previously been shown in model systems (Leclère & Birlouez-Aragon, 2001; Masaki, Okano, & Sakurai, 1999) and in biological samples (Murthy & Sun, 2000) that fluorescent products from Maillard reaction have a maximum excitation at wavelengths between 340 and 370 nm, and that the wavelengths of maximum emission are between 420 and 450 nm. The fluorescence from these products is clearly distinguishable from that of tryptophan in proteins (for which the wavelengths for maximum excitation and emission are 290 and 336 nm, respectively). Synchronous fluorescence spectra were thus selected to analyze the samples (Fig. 3B). The wavelengths of maximum emission of fluorescent products were at 370–390 nm and 430–440 nm, which agreed with the above-mentioned range (420–450 nm). However wavelengths between 370 and 390 nm were not detected in the previous papers of the above-mentioned authors. Although the chemical structures of the fluorescent products were only described for a few of those compounds, all the available structures indicated that they always have one or more nitrogen atoms originating from the reactant amino-compounds.
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