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Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry.

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Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry. / Tsikas, Dimitrios; Schwedhelm, Edzard; Stutzer, Friedericke K; Gutzki, Frank Mathias; Iris, Rode; Mehls, Christina; Frölich, Jürgen C.

In: J CHROMATOGR B, Vol. 784, No. 1, 1, 2003, p. 77-90.

Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review

Harvard

Tsikas, D, Schwedhelm, E, Stutzer, FK, Gutzki, FM, Iris, R, Mehls, C & Frölich, JC 2003, 'Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry.', J CHROMATOGR B, vol. 784, no. 1, 1, pp. 77-90. <http://www.ncbi.nlm.nih.gov/pubmed/12504185?dopt=Citation>

APA

Tsikas, D., Schwedhelm, E., Stutzer, F. K., Gutzki, F. M., Iris, R., Mehls, C., & Frölich, J. C. (2003). Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry. J CHROMATOGR B, 784(1), 77-90. [1]. http://www.ncbi.nlm.nih.gov/pubmed/12504185?dopt=Citation

Vancouver

Tsikas D, Schwedhelm E, Stutzer FK, Gutzki FM, Iris R, Mehls C et al. Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry. J CHROMATOGR B. 2003;784(1):77-90. 1.

Bibtex

@article{49c91fc1d85a48bea9a8ba598b4a97a2,
title = "Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry.",
abstract = "Measurement of 3-nitro-L-tyrosine (NO(2)Tyr) and protein-related 3-nitro-L-tyrosine in human plasma is associated with numerous methodological problems which result in highly divergent basal plasma levels often ranging within two orders of magnitude. Recently, we have described an interference-free GC-tandem MS-based method for NO(2)Tyr which yielded the lowest basal plasma NO(2)Tyr levels reported thus far. This method was extended to quantify protein-associated 3-nitrotyrosine and in particular 3-nitrotyrosinated albumin (NO(2)TyrALB) in human plasma. NO(2)TyrALB and albumin (ALB) were extracted from plasma by affinity column extraction and digested enzymatically at neutral pH. 3-Nitro- L-[2H(3)]tyrosine was used as internal standard. In plasma of 18 healthy young volunteers the molar ratio of NO(2)TyrALB to albumin-derived tyrosine (TyrALB), i.e. NO(2)TyrALB/TyrALB, was determined to be 1.55+/-0.54x1:10(6) (mean+/-SD). The plasma concentration of NO(2)TyrALB was estimated as 24+/-4 nM. The NO(2)Tyr plasma levels in these volunteers were determined to be 0.73+/-0.53 nM. In the same volunteers, NO(2)TyrALB/TyrALB, NO(2)TyrALB and NO(2)Tyr were measured 15 days later and the corresponding values were determined to be 1.25+/-0.58x1:10(6), 25+/-6 nM and 0.69+/-0.16 nM. For comparison, NO(2)Tyr and NO(2)TyrALB were measured in six plasma samples from healthy volunteers by GC-MS and GC-tandem MS. Different values were found for NO(2)Tyr, i.e. 5.4+/-2.8 versus 2.7+/-1.5 nM, and comparable values for NO(2)TyrALB/TyrALB, i.e. 0.5+/-0.2x1:10(6) versus 0.4+/-0.1x1:10(6), by these methods. The ratio of the values measured by GC-MS to those measured by GC-tandem MS were 2.9+/-3.1 for NO(2)Tyr and 1.2+/-0.2 for NO(2)TyrALB/TyrALB. The present GC-tandem MS method provides accurate values of NO(2)Tyr and NO(2)TyrALB in human plasma.",
author = "Dimitrios Tsikas and Edzard Schwedhelm and Stutzer, {Friedericke K} and Gutzki, {Frank Mathias} and Rode Iris and Christina Mehls and Fr{\"o}lich, {J{\"u}rgen C}",
year = "2003",
language = "Deutsch",
volume = "784",
pages = "77--90",
journal = "J CHROMATOGR B",
issn = "1570-0232",
publisher = "Elsevier",
number = "1",

}

RIS

TY - JOUR

T1 - Accurate quantification of basal plasma levels of 3-nitrotyrosine and 3-nitrotyrosinoalbumin by gas chromatography-tandem mass spectrometry.

AU - Tsikas, Dimitrios

AU - Schwedhelm, Edzard

AU - Stutzer, Friedericke K

AU - Gutzki, Frank Mathias

AU - Iris, Rode

AU - Mehls, Christina

AU - Frölich, Jürgen C

PY - 2003

Y1 - 2003

N2 - Measurement of 3-nitro-L-tyrosine (NO(2)Tyr) and protein-related 3-nitro-L-tyrosine in human plasma is associated with numerous methodological problems which result in highly divergent basal plasma levels often ranging within two orders of magnitude. Recently, we have described an interference-free GC-tandem MS-based method for NO(2)Tyr which yielded the lowest basal plasma NO(2)Tyr levels reported thus far. This method was extended to quantify protein-associated 3-nitrotyrosine and in particular 3-nitrotyrosinated albumin (NO(2)TyrALB) in human plasma. NO(2)TyrALB and albumin (ALB) were extracted from plasma by affinity column extraction and digested enzymatically at neutral pH. 3-Nitro- L-[2H(3)]tyrosine was used as internal standard. In plasma of 18 healthy young volunteers the molar ratio of NO(2)TyrALB to albumin-derived tyrosine (TyrALB), i.e. NO(2)TyrALB/TyrALB, was determined to be 1.55+/-0.54x1:10(6) (mean+/-SD). The plasma concentration of NO(2)TyrALB was estimated as 24+/-4 nM. The NO(2)Tyr plasma levels in these volunteers were determined to be 0.73+/-0.53 nM. In the same volunteers, NO(2)TyrALB/TyrALB, NO(2)TyrALB and NO(2)Tyr were measured 15 days later and the corresponding values were determined to be 1.25+/-0.58x1:10(6), 25+/-6 nM and 0.69+/-0.16 nM. For comparison, NO(2)Tyr and NO(2)TyrALB were measured in six plasma samples from healthy volunteers by GC-MS and GC-tandem MS. Different values were found for NO(2)Tyr, i.e. 5.4+/-2.8 versus 2.7+/-1.5 nM, and comparable values for NO(2)TyrALB/TyrALB, i.e. 0.5+/-0.2x1:10(6) versus 0.4+/-0.1x1:10(6), by these methods. The ratio of the values measured by GC-MS to those measured by GC-tandem MS were 2.9+/-3.1 for NO(2)Tyr and 1.2+/-0.2 for NO(2)TyrALB/TyrALB. The present GC-tandem MS method provides accurate values of NO(2)Tyr and NO(2)TyrALB in human plasma.

AB - Measurement of 3-nitro-L-tyrosine (NO(2)Tyr) and protein-related 3-nitro-L-tyrosine in human plasma is associated with numerous methodological problems which result in highly divergent basal plasma levels often ranging within two orders of magnitude. Recently, we have described an interference-free GC-tandem MS-based method for NO(2)Tyr which yielded the lowest basal plasma NO(2)Tyr levels reported thus far. This method was extended to quantify protein-associated 3-nitrotyrosine and in particular 3-nitrotyrosinated albumin (NO(2)TyrALB) in human plasma. NO(2)TyrALB and albumin (ALB) were extracted from plasma by affinity column extraction and digested enzymatically at neutral pH. 3-Nitro- L-[2H(3)]tyrosine was used as internal standard. In plasma of 18 healthy young volunteers the molar ratio of NO(2)TyrALB to albumin-derived tyrosine (TyrALB), i.e. NO(2)TyrALB/TyrALB, was determined to be 1.55+/-0.54x1:10(6) (mean+/-SD). The plasma concentration of NO(2)TyrALB was estimated as 24+/-4 nM. The NO(2)Tyr plasma levels in these volunteers were determined to be 0.73+/-0.53 nM. In the same volunteers, NO(2)TyrALB/TyrALB, NO(2)TyrALB and NO(2)Tyr were measured 15 days later and the corresponding values were determined to be 1.25+/-0.58x1:10(6), 25+/-6 nM and 0.69+/-0.16 nM. For comparison, NO(2)Tyr and NO(2)TyrALB were measured in six plasma samples from healthy volunteers by GC-MS and GC-tandem MS. Different values were found for NO(2)Tyr, i.e. 5.4+/-2.8 versus 2.7+/-1.5 nM, and comparable values for NO(2)TyrALB/TyrALB, i.e. 0.5+/-0.2x1:10(6) versus 0.4+/-0.1x1:10(6), by these methods. The ratio of the values measured by GC-MS to those measured by GC-tandem MS were 2.9+/-3.1 for NO(2)Tyr and 1.2+/-0.2 for NO(2)TyrALB/TyrALB. The present GC-tandem MS method provides accurate values of NO(2)Tyr and NO(2)TyrALB in human plasma.

M3 - SCORING: Zeitschriftenaufsatz

VL - 784

SP - 77

EP - 90

JO - J CHROMATOGR B

JF - J CHROMATOGR B

SN - 1570-0232

IS - 1

M1 - 1

ER -