Quantitation of blood and plasma amino acids using isotope dilution electron impact gas chromatography/mass spectrometry with U-C-13 amino acids as internal standards

Alexander Graham Calder, Karen Elise Garden, Susan Elizabeth Anderson, Gerald Lobley

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

A method to quantitate blood and plasma amino acids by isotope dilution gas chromatography/mass spectrometry (GC/MS) is described, Samples were spiked with U-C-13 amino acids as internal standards and the tert-butyldimethylsilyl derivatives (tBDMS) separated by capillary column gas chromatography. Linear regression curves, generated for individual amino acids, gave correlation coefficients of 0.9999. The reproducibility of the method was assessed from the analysis of 10 replicate blood and plasma samples. For most amino acids a coefficient of variance (CV) of less than or equal to 1% was obtained with the exception of aspartate which gave a value of 1.8%. This was probably due to the low concentration of this amino acid in the samples analysed, Recovery of amino acids added to plasma was between 96 and 103%. The use of electron impact ionization (EI) allows the method to be used in laboratories where only the more basic GC/MS is available and reduces the time spent on instrument maintenance. The method should prove useful in areas of work where accurate and precise amino acid concentrations are required. Copyright (C) 1999 John Wiley & Sons, Ltd.

Original languageEnglish
Pages (from-to)2080-2083
Number of pages4
JournalRapid Communications in Mass Spectrometry
Volume13
Issue number21
Publication statusPublished - 1999

Keywords

  • mass-spectrometry
  • biological samples
  • splanchnic-bed
  • whole-blood
  • derivatives
  • sheep
  • flux

Cite this

Quantitation of blood and plasma amino acids using isotope dilution electron impact gas chromatography/mass spectrometry with U-C-13 amino acids as internal standards. / Calder, Alexander Graham; Garden, Karen Elise; Anderson, Susan Elizabeth; Lobley, Gerald.

In: Rapid Communications in Mass Spectrometry, Vol. 13, No. 21, 1999, p. 2080-2083.

Research output: Contribution to journalArticle

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abstract = "A method to quantitate blood and plasma amino acids by isotope dilution gas chromatography/mass spectrometry (GC/MS) is described, Samples were spiked with U-C-13 amino acids as internal standards and the tert-butyldimethylsilyl derivatives (tBDMS) separated by capillary column gas chromatography. Linear regression curves, generated for individual amino acids, gave correlation coefficients of 0.9999. The reproducibility of the method was assessed from the analysis of 10 replicate blood and plasma samples. For most amino acids a coefficient of variance (CV) of less than or equal to 1{\%} was obtained with the exception of aspartate which gave a value of 1.8{\%}. This was probably due to the low concentration of this amino acid in the samples analysed, Recovery of amino acids added to plasma was between 96 and 103{\%}. The use of electron impact ionization (EI) allows the method to be used in laboratories where only the more basic GC/MS is available and reduces the time spent on instrument maintenance. The method should prove useful in areas of work where accurate and precise amino acid concentrations are required. Copyright (C) 1999 John Wiley & Sons, Ltd.",
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T1 - Quantitation of blood and plasma amino acids using isotope dilution electron impact gas chromatography/mass spectrometry with U-C-13 amino acids as internal standards

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AU - Lobley, Gerald

PY - 1999

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N2 - A method to quantitate blood and plasma amino acids by isotope dilution gas chromatography/mass spectrometry (GC/MS) is described, Samples were spiked with U-C-13 amino acids as internal standards and the tert-butyldimethylsilyl derivatives (tBDMS) separated by capillary column gas chromatography. Linear regression curves, generated for individual amino acids, gave correlation coefficients of 0.9999. The reproducibility of the method was assessed from the analysis of 10 replicate blood and plasma samples. For most amino acids a coefficient of variance (CV) of less than or equal to 1% was obtained with the exception of aspartate which gave a value of 1.8%. This was probably due to the low concentration of this amino acid in the samples analysed, Recovery of amino acids added to plasma was between 96 and 103%. The use of electron impact ionization (EI) allows the method to be used in laboratories where only the more basic GC/MS is available and reduces the time spent on instrument maintenance. The method should prove useful in areas of work where accurate and precise amino acid concentrations are required. Copyright (C) 1999 John Wiley & Sons, Ltd.

AB - A method to quantitate blood and plasma amino acids by isotope dilution gas chromatography/mass spectrometry (GC/MS) is described, Samples were spiked with U-C-13 amino acids as internal standards and the tert-butyldimethylsilyl derivatives (tBDMS) separated by capillary column gas chromatography. Linear regression curves, generated for individual amino acids, gave correlation coefficients of 0.9999. The reproducibility of the method was assessed from the analysis of 10 replicate blood and plasma samples. For most amino acids a coefficient of variance (CV) of less than or equal to 1% was obtained with the exception of aspartate which gave a value of 1.8%. This was probably due to the low concentration of this amino acid in the samples analysed, Recovery of amino acids added to plasma was between 96 and 103%. The use of electron impact ionization (EI) allows the method to be used in laboratories where only the more basic GC/MS is available and reduces the time spent on instrument maintenance. The method should prove useful in areas of work where accurate and precise amino acid concentrations are required. Copyright (C) 1999 John Wiley & Sons, Ltd.

KW - mass-spectrometry

KW - biological samples

KW - splanchnic-bed

KW - whole-blood

KW - derivatives

KW - sheep

KW - flux

M3 - Article

VL - 13

SP - 2080

EP - 2083

JO - Rapid Communications in Mass Spectrometry

JF - Rapid Communications in Mass Spectrometry

SN - 0951-4198

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