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Simultaneous analysis of sulfur-containing excitatory amino acids using micellar electrokinetic chromatography with diode array and laser-induced fluorescence detection.
Electrophoresis. 2002 Aug; 23(15):2457-64.E

Abstract

The suitability of micellar electrokinetic chromatography (MEKC) coupled with diode array or laser-induced fluorescence (LIF) detection to analyze the four sulfur-containing excitatory amino acids (SEAA), homocysteine sulfinic acid (HCSA), homocysteic acid (HCA), cysteine sulfinic acid (CSA), and cysteic acid (CA) was investigated. 5-Carboxy-fluorescein succinimidyl ester was chosen as fluorescent reagent to derivatize HCSA, HCA, CSA, and CA. During method development, the yield of reaction dependent on pH and incubation time as well as the stability of the products were analyzed. The maximum yield was obtained after 30 min using a 0.1 M borate buffer (pH 8.9) as derivatization buffer. Each labeled amino acid exhibited high stability at room temperature over a period of 5 days. Baseline separation of labeled HCSA, HCA, CSA, and CA was obtained using a buffer consisting of 0.1 M borate, 50 mM sodium dodecyl sulfate (SDS), and 5% v/v methanol (pH 9.0). By applying LIF detection, limits of detection ranged from 0.9 x 10(-10) M for HCSA to 6.0 x 10(-10) M for CA, respectively. Slightly modified separation conditions enabled the analysis of SEAA in cerebrospinal fluid in the presence of the neurotransmitters glutamate and aspartate. In conclusion, MEKC coupled with LIF detection is a suitable technique for the simultaneous and sensitive analysis of SEAA. Further work will focus on the validation of the method with cerebrospinal fluid as sample matrix.

Authors+Show Affiliations

Institute of Pharmacy, Department of Clinical Pharmacy, University of Bonn, Germany.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Validation Study

Language

eng

PubMed ID

12210203

Citation

Becker, Achim, et al. "Simultaneous Analysis of Sulfur-containing Excitatory Amino Acids Using Micellar Electrokinetic Chromatography With Diode Array and Laser-induced Fluorescence Detection." Electrophoresis, vol. 23, no. 15, 2002, pp. 2457-64.
Becker A, Scheuch E, Bode U, et al. Simultaneous analysis of sulfur-containing excitatory amino acids using micellar electrokinetic chromatography with diode array and laser-induced fluorescence detection. Electrophoresis. 2002;23(15):2457-64.
Becker, A., Scheuch, E., Bode, U., & Jaehde, U. (2002). Simultaneous analysis of sulfur-containing excitatory amino acids using micellar electrokinetic chromatography with diode array and laser-induced fluorescence detection. Electrophoresis, 23(15), 2457-64.
Becker A, et al. Simultaneous Analysis of Sulfur-containing Excitatory Amino Acids Using Micellar Electrokinetic Chromatography With Diode Array and Laser-induced Fluorescence Detection. Electrophoresis. 2002;23(15):2457-64. PubMed PMID: 12210203.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Simultaneous analysis of sulfur-containing excitatory amino acids using micellar electrokinetic chromatography with diode array and laser-induced fluorescence detection. AU - Becker,Achim, AU - Scheuch,Eberhard, AU - Bode,Udo, AU - Jaehde,Ulrich, PY - 2002/9/5/pubmed PY - 2003/3/13/medline PY - 2002/9/5/entrez SP - 2457 EP - 64 JF - Electrophoresis JO - Electrophoresis VL - 23 IS - 15 N2 - The suitability of micellar electrokinetic chromatography (MEKC) coupled with diode array or laser-induced fluorescence (LIF) detection to analyze the four sulfur-containing excitatory amino acids (SEAA), homocysteine sulfinic acid (HCSA), homocysteic acid (HCA), cysteine sulfinic acid (CSA), and cysteic acid (CA) was investigated. 5-Carboxy-fluorescein succinimidyl ester was chosen as fluorescent reagent to derivatize HCSA, HCA, CSA, and CA. During method development, the yield of reaction dependent on pH and incubation time as well as the stability of the products were analyzed. The maximum yield was obtained after 30 min using a 0.1 M borate buffer (pH 8.9) as derivatization buffer. Each labeled amino acid exhibited high stability at room temperature over a period of 5 days. Baseline separation of labeled HCSA, HCA, CSA, and CA was obtained using a buffer consisting of 0.1 M borate, 50 mM sodium dodecyl sulfate (SDS), and 5% v/v methanol (pH 9.0). By applying LIF detection, limits of detection ranged from 0.9 x 10(-10) M for HCSA to 6.0 x 10(-10) M for CA, respectively. Slightly modified separation conditions enabled the analysis of SEAA in cerebrospinal fluid in the presence of the neurotransmitters glutamate and aspartate. In conclusion, MEKC coupled with LIF detection is a suitable technique for the simultaneous and sensitive analysis of SEAA. Further work will focus on the validation of the method with cerebrospinal fluid as sample matrix. SN - 0173-0835 UR - https://www.unboundmedicine.com/medline/citation/12210203/Simultaneous_analysis_of_sulfur_containing_excitatory_amino_acids_using_micellar_electrokinetic_chromatography_with_diode_array_and_laser_induced_fluorescence_detection_ L2 - https://doi.org/10.1002/1522-2683(200208)23:15<2457::AID-ELPS2457>3.0.CO;2-6 DB - PRIME DP - Unbound Medicine ER -