Neurotransmitter Analysis Service — LC-MS/MS Quantification of 30+ Neurotransmitters & Metabolites Across 5 Pathways

Neurotransmitter Detection Panel — 30+ Analytes Organized by Pathway

Each analyte is quantified against its own stable isotope-labeled internal standard. The panel is organized by biosynthetic pathway because parent-to-metabolite ratios are the biologically informative readout — a single concentration number without pathway context reveals little about neuronal activity. Each pathway sub-page provides dedicated compound lists, sample requirements, and method details.

Catecholamine Pathway — Dopamine, Norepinephrine, Epinephrine & Metabolites

Serotonin & Tryptophan Pathway

GABA, Glutamate & Amino Acid Neurotransmitters

Acetylcholine & Histamine Pathways

Analytical Platform & Method for Neurotransmitter Quantification

Neurotransmitter Analysis Workflow

1

Sample Collection & Stabilization

Brain tissue: microwave fixation preferred (instantly inactivates enzymes — essential for ACh); snap-freezing in liquid N2 acceptable for monoamines and amino acid NTs. CSF: pre-chilled tubes with ascorbic acid + EDTA, freeze within 30 min. Plasma: EDTA with sodium metabisulfite (1 mg/mL), centrifuge within 15 min at 4 degree C. Microdialysate: collect into perchloric or ascorbic acid. Dry ice shipping.

2

Sample Preparation & Derivatization

Tissue homogenization in ice-cold perchloric acid or acetonitrile:water with stable isotope IS cocktail spiked at homogenization. Protein precipitation for biofluids. Dansyl chloride or benzoyl chloride derivatization for ACh, histamine, and trace amines. SPE cleanup for complex matrices.

3

LC-MS/MS MRM Acquisition

Scheduled MRM on SCIEX QTRAP 6500+ with HILIC column, 2-3 transitions per analyte. Sequence: blank, 6-8 calibrators, matrix-matched QC, randomized study samples with QC every 8-10 injections. Matched stable isotope IS for key analytes.

4

Quantification & QC Review

Stable isotope dilution with 1/x2 weighted calibration. Turnover ratios pre-calculated per sample. QC: pooled QC RSD below 15%, IS CV below 10%, blank carryover below 1% LLOQ, calibrator accuracy within plus or minus 15%.

5

Report Delivery

Concentration table (ng/mL or ng/g) with pre-calculated turnover ratios. MRM chromatograms with IS overlay. QC report. Methods documentation. Optional: group comparisons (FDR, PCA, PLS-DA), pathway diagrams, publication-ready figures.

Sample Requirements for Neurotransmitter Analysis

Applications of Neurotransmitter Analysis

Deliverables — What You Receive

• Quantitative Concentration Table — Absolute concentrations (ng/mL or ng/g tissue) for each analyte per sample. Excel and CSV. Turnover ratios pre-calculated. LOD/LLOQ flags and IS recovery per sample.
• QC Report — Calibration curves (6-8 points, 1/x2 weighted, R2 and back-calculated accuracy). Pooled QC RSD. IS recovery per sample. Blank carryover. Spike recovery at 3 levels per matrix.
• MRM Chromatograms — Extracted ion chromatograms for each analyte with co-eluting stable isotope IS overlay. MS/MS confirmation spectra for isomer identification.
• Methods Documentation — Complete LC-MS/MS parameters, derivatization protocol, extraction method, data processing settings. Formatted for manuscript methods section.
• Optional Statistical Analysis — Group comparisons (t-test/ANOVA, FDR, volcano/box plots), PCA/PLS-DA, pathway diagrams, publication-ready figures (300 DPI TIFF + vector PDF/AI).

Data Visualizations

HILIC MRM chromatogram: dopamine, serotonin, norepinephrine, and key metabolites (HVA, DOPAC, 5-HIAA, MHPG) with co-eluting stable isotope internal standards, demonstrating baseline resolution and retention time stability.

Stable isotope dilution calibration curves for dopamine and serotonin (6 points, 1/x2 weighted regression, R2 above 0.998), with LOD and LLOQ indicated per analyte.

Turnover ratio box plots: HVA/DA and 5-HIAA/5-HT across experimental groups with FDR-corrected significance, demonstrating the superior biological resolution of metabolite-to-parent ratios over static concentrations.

Integrated neurotransmitter pathway map: catecholamine and serotonin biosynthesis and metabolism with detected metabolites colored by fold-change, showing synthesis, release, reuptake, and degradation pathway coverage.

Case Study — Simultaneous Quantification of 15 Neurotransmitters in a Single Rodent Brain Sample: From Tissue to Microdialysate

Validated methods for determination of neurotransmitters and metabolites in rodent brain tissue and extracellular fluid by reversed phase UHPLC-MS/MS

Van Schoors, J., Viaene, J., Van Wanseele, Y., et al. | Journal of Chromatography A, 2016, 1443, 73-83 | IF: 3.8

DOI: 10.1016/j.jchromb.2016.06.011

What They Needed

Quantifying all major neurotransmitter classes — monoamines, their metabolites, amino acid neurotransmitters, and acetylcholine — from a single brain sample is analytically demanding. The core problems: glutamate is present at uM while serotonin and ACh are at low nM (10,000-fold difference), ACh is hydrolyzed within seconds of death, and brain tissue phospholipids cause severe ion suppression in ESI-MS. The researchers needed one validated method that could handle both brain tissue homogenates AND microdialysate — matrices with vastly different concentration ranges and interference profiles.

What They Got

Van Schoors et al. developed a reversed-phase UHPLC-MS/MS method with dansyl chloride derivatization that simultaneously quantified 15 neurotransmitters and metabolites across monoamine, amino acid, and acetylcholine pathways from a single injection:

The dansyl chloride derivatization step was the key innovation — enhancing sensitivity for low-abundance monoamines 10-50x while improving chromatographic retention. Applied to rat brain, the method revealed clear region-specific neurotransmitter profiles: striatum dominated by dopamine (12.5 ng/mg, DOPAC/DA 0.32), hippocampus by acetylcholine (2.8 ng/mg), and prefrontal cortex by serotonin (0.9 ng/mg, 5-HIAA/5-HT 1.4).

Why This Matters for Your Research

The region-specific neurotransmitter profiles reported here — striatal DA (12.5 ng/mg), hippocampal ACh (2.8 ng/mg), cortical 5-HT (0.9 ng/mg) — are not just numbers. They demonstrate that a single validated LC-MS/MS method can resolve neuroanatomical differences in neurotransmitter systems simultaneously. If you are comparing wild-type vs. knockout brain regions, tracking drug-induced neurotransmitter changes over a time course, or profiling microdialysate fractions before and after a behavioral intervention, this is your analytical framework. You do not need separate assays for monoamines, amino acids, and acetylcholine — one injection, one report, all ratios pre-calculated.

How Our Service Delivers the Same Rigor

This study mirrors our neurotransmitter panel: (1) a single extraction and injection covering monoamines, amino acid NTs, and acetylcholine — no need for separate assays; (2) stable isotope internal standards with documented precision and recovery; (3) matrix-specific validation giving you confidence in data across brain tissue, CSF, plasma, and microdialysate. When you submit your samples, every neurotransmitter is resolved, every metabolite tracked, and every turnover ratio pre-calculated — the same analytical framework, applied to your experiment.

Reference

1. Van Schoors, J., Viaene, J., Van Wanseele, Y., et al. Validated methods for determination of neurotransmitters and metabolites in rodent brain tissue and extracellular fluid by reversed phase UHPLC-MS/MS. Journal of Chromatography A 1443, 73-83 (2016).

Frequently Asked Questions

Selected Publications in Neurotransmitter Analysis