A Dual Ligand Sol-Gel Organic-Silica Hybrid Monolithic Capillary for In-Tube SPME-MS/MS to Determine Amino Acids in Plasma Samples

Author(s)

Miranda, Luis F. C. ^[1] ; Goncalves, Rogeria R. ^[1] ; Queiroz, Maria E. C. ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Filosofia Ciencia & Letras Ribeirao Preto, Dept Quim, POB 14040-901, BR-14040901 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Molecules; v. 24, n. 9 MAY 1 2019.
• Web of Science Citations: 3

Abstract

This work describes the direct coupling of the in-tube solid-phase microextraction (in-tube SPME) technique to a tandem mass spectrometry system (MS/MS) to determine amino acids (AA) and neurotransmitters (NT) (alanine, serine, isoleucine, leucine, aspartic acid, glutamic acid, lysine, methionine, tyrosine, and tryptophan) in plasma samples from schizophrenic patients. An innovative organic-silica hybrid monolithic capillary with bifunctional groups (amino and cyano) was developed and evaluated as an extraction device for in-tube SPME. The morphological and structural aspects of the monolithic phase were evaluated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), nitrogen sorption experiments, X-ray diffraction (XRD) analyses, and adsorption experiments. In-tube SPME-MS/MS conditions were established to remove matrix, enrich analytes (monolithic capillary) and improve the sensitivity of the MS/MS system. The proposed method was linear from 45 to 360 ng mL(-1) for alanine, from 15 to 300 ng mL(-1) for leucine and isoleucine, from 12 to 102 ng mL(-1) for methionine, from 10 to 102 ng mL(-1) for tyrosine, from 9 to 96 ng mL(-1) for tryptophan, from 12 to 210 ng mL(-1) for serine, from 12 to 90 ng mL(-1) for glutamic acid, from 12 to 102 ng mL(-1) for lysine, and from 6 to 36 ng mL(-1) for aspartic acid. The precision of intra-assays and inter-assays presented CV values ranged from 1.6% to 14.0%. The accuracy of intra-assays and inter-assays presented RSE values from -11.0% to 13.8%, with the exception of the lower limit of quantification (LLOQ) values. The in-tube SPME-MS/MS method was successfully applied to determine the target AA and NT in plasma samples from schizophrenic patients. (AU)

• FAPESP's process: 17/02147-0 - Single drop chromatography and its coupling to mass spectrometry: instrumental strategies, development of materials, automation and analytical applications
• Grantee: Fernando Mauro Lanças
• Support Opportunities: Research Projects - Thematic Grants