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- W2045205216 abstract "Microbiological methods have been used to determine the amino acid availability of a variety of animal feed and human food protein sources. Growth of Escherichia coli auxotrophs have been shown to yield a consistent linear response to lysine concentration when compared to chemical measures. Extent of total growth of E. coli lysine mutant (American Type Culture Collection #23812) when measured as optical density (OD) displays a lysine-dependent growth response that can be used to estimate lysine in feed proteins. However, typical OD-based growth studies for amino acid quantitation using the mutant may require anywhere from 12 to over 40 h. To develop an improved rapid method for lysine quantitation in protein sources, the plasmid pJHD500 carrying genes that encode for expression of bioluminescence and ampicillin resistance was transformed into the E. coli mutant by electroporation (set at 1.80 kV). The luminescence measured during early exponential growth allowed detectable differentiation of lysine concentration in the media in 4 h. When the luminescence method was compared with the conventional optical density lysine growth assay, the correlation coefficient was 0.989. Lysine availability valued for enzymatically hydrolyzed protein sources were comparable with availability measures using animal methods for lysine availability. This research shows potential applications for more rapid quantitative measurement of bioavailable lysine." @default.
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- W2045205216 date "2000-05-01" @default.
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- W2045205216 title "A bioluminescent Escherichia coli auxotroph for use in an in vitro lysine availability assay" @default.
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- W2045205216 doi "https://doi.org/10.1016/s0167-7012(00)00121-4" @default.
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