Determination of biogenic amines in food by automated pre-column derivatization with 2-naphthyloxycarbonyl chloride (NOC-CI) |
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Authors: | J Kirschbaum I Busch H Brückner |
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Institution: | (1) Institute of Nutritional Sciences, Department of Food Sciences, Justus-Liebig-University of Giessen, Südanlage 6, 35390 Giessen, Germany |
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Abstract: | Summary The fluorogenic reagent 2-naphthyloxycarbonyl chloride (NOC-Cl) has been used for the automated precolumn derivatization of
biogenic amines (BAs) at ambient followed by liquid-chromatographic separation of the derivatives formed.
For optimized derivatization samples in 0.5 M borate buffer (pH 9.0) were derivatized with 5 mM NOC-Cl in acetonitrile (MeCN)
for 3 minutes. Excess of reagent was scavenged by addition of 20 mM glycine in water. For HPLC a Superspher? RP-18e column and gradient elution using 0.1 M sodium acetate buffer (pH 4.4) and MeCN were used. The NOC-derivatives were
detected by fluorescence at an emission wavelength of 335 nm at an excitation wavelength of 274 nm.
This method allows the detection of BAs (2-phenylethylamine, putrescine, histamine, cadaverine, tyramine, spermidine, spermine)
found in food and beverages (fruit juices, wines, various vinegars, fermented cabbage juice, and salmon).
Detection limit of BAs are approximately 49–113 μg kg−1 with the exception of histamine (747 μg kg−1) (injected amounts: 18–41 pg histamine 267 pg), at a signalto-noise ratio of 3:1. The limits of determination are approximately
82–189 μg kg−1 (histamine 1245 μg kg−1) at a signal-to-noise ratio of 5:1. The correlation coefficients of linearity are 0.9910–0.9976. Recoveries from different
matrices range from 65 to 109%, depending on the sample investigated.
Presented at the 21st ISC held in Stuttgart, Germany, 15th–20th September, 1996. |
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Keywords: | Column liquid chromatography Pre-column derivatization 2-Naphthyloxycarbonyl chloride Biogenic amines Biogenic amine index (BAI) |
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