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- W2075342417 abstract "A method for measurement of ϵ-N-trimethyllysine in human blood plasma and urine is described. An internal standard, δ-N-trimethylornithine, was added to plasma and urine specimens and the mixtures were deproteinized and/or hydrolyzed. Preliminary purification of ϵ-N-trimethyllysine and δ-N-trimethylornithine was achieved by sequential cation-exchange-anion-exchange chromatography. Amino acids in the column eluates were derivatized with o-phthalaldehyde and mercaptoethanol, and were separated by isocratic reversed-phase high-performance liquid chromatography in the presence of an ion-pairing reagent. Quantitation was achieved by post-column fluorometry. The limit of detection was 5 pmol of ϵ-N-trimethyllysine injected into the chromatograph. The procedure was suitable for determination of ϵ-N-trimethyllysine in 1 ml of plasma or 0.2–0.4 ml of urine. The method was applied to measurements of ϵ-N-trimethyllysine in plasma and urine of four systemic carnitine deficiency patients and six normal subjects. Plasma ϵ-N-trimethyllysine concentration was significantly lower in systemic carnitine deficiency patients compared to normal individuals, but no significant difference in urinary ϵ-N-trimethyllysine excretion was observed between the two groups." @default.
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- W2075342417 date "1987-04-01" @default.
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- W2075342417 title "Measurement of ϵ-N-trimethyllysine in human blood plasma and urine" @default.
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- W2075342417 doi "https://doi.org/10.1016/0003-2697(87)90018-2" @default.
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