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Flow-injection spectrophotometric determination of lysine in feed samples

✍ Scribed by J. Saurina; S. Hernández-Cassou

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
691 KB
Volume
281
Category
Article
ISSN
0003-2670

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✦ Synopsis

A flow-injection spectrophotometric method is described for the determination of lysine, based on the product of the reaction between lysine and 1,2-naphthoquinone-4-sulphonate in basic medium. The influence of different physical, chemical and hydrodynamic parameters on absorbance were studied. At 480 mn, the response is linear up to 1.5 x 10e4 M, the detection lit is 1.9 X 10T6 M and the relative standard deviation is 0.8%. Sample throughput is 80 h-t. The method was applied to the determination of free iysine in commercial feed samples, by means of multivariate calibration techniques, without the need of chromatographic separation. Good concordance is shown between thii method and the standard procedure for amino acid analysis.

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