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Quantitative detection of crystalline lysine supplementation in poultry feeds using a rapid bacterial bioluminescence assay

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Abstract

Lysine is an essential amino acid for both humans and animals; and it is usually the first or second limiting amino acid in most formulated diets. In order to estimate the lysine content in feeds and feed sources, rapid amino acid bioassays have been developed. The objective of this work is to assess a rapid assay for lysine supplementation in chicken feeds, using a luminescent Escherichia coli lysine-auxotrophic strain, to avoid prior thermal sterilization. An E. coli lysine auxotroph carrying a plasmid with lux genes was used as the test organism. The lysine assay was conducted using depleted auxotrophic cells in lysine samples. Luminescence was measured with a Dynex MLX luminometer after addition of the aldehyde substrate. Growth response (monitored as optical density at 600 nm) and light emission response of the assay E. coli strain were monitored to generate standard curves. Bioluminescent analysis of feed samples indicated that the method works well in the presence of a complex feed matrix. Comparison of both optical density and luminescent-based methods indicated that, when the assay takes place under optimal conditions, both methodologies correlated well (r 2=0.99). Except for the 0.64% lysine-supplemented feed, estimates for lysine based on the bacterial assay were over 80% (82–97%) of the theoretical values. Animal data showed that the bacterial bioluminescent method correlated well with the chick bioassay when diets with different levels of lysine supplementation were assayed for lysine bioavailability (r 2=0.97). Luminescent methodology coupled with a bacterial growth assay is a promising technique to assess lysine availability in supplemented animal feeds.

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Acknowledgements

This research was supported by Hatch grant H8311 (administered by the Texas A&M Agricultural Experiment Station) and by the Texas Advanced Technology Program, grant 000517-0220-2001 (Texas Higher Education Board, Austin, Tex.). The LUZ-CONICIT Graduate Fellowship (Maracaibo, Venezuela) supported I.B.Z.D. We thank C. Weiser and D. Jackson for conducting the chick growth assay.

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  1. Poultry Science Department, Texas A&M University, 2472 TAMU, College Station, TX 77843-2472, USA

    I. B. Zabala Díaz & S. C. Ricke

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  1. I. B. Zabala Díaz
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  2. S. C. Ricke
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Correspondence to S. C. Ricke.

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Zabala Díaz, I.B., Ricke, S.C. Quantitative detection of crystalline lysine supplementation in poultry feeds using a rapid bacterial bioluminescence assay. Appl Microbiol Biotechnol 62, 268–273 (2003). https://doi.org/10.1007/s00253-003-1271-1

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  • DOI: https://doi.org/10.1007/s00253-003-1271-1

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