Analytical Techniques for Neurotransmitter Measurement

Quantifying neurotransmitters with high specificity and sensitivity is crucial for understanding neuronal communication, disease mechanisms and therapeutic monitoring. A range of analytical approaches has been developed, spanning chromatographic separations coupled to diverse detection modes, direct vibrational spectroscopies and sensor-based methods. Liquid chromatography–mass spectrometry (LC-MS) and liquid chromatography with electrochemical or fluorescence detection remain workhorses for routine assays, offering broad applicability to monoamines, amino acids, peptides and metabolites. Complementary spectroscopic techniques, including ultraviolet–visible absorption, infrared and Raman spectroscopies, provide label-free analysis with minimal sample preparation. Advances in microdialysis and solid-phase extraction (SPE) enable real-time sampling from living tissue and enrichment of low-abundance analytes. Nanostructured substrates for surface-enhanced Raman spectroscopy (SERS) and bespoke chemical sensors have further extended detection limits into the picomolar and femtomolar ranges. Together, these methods facilitate multiplexed measurements in biofluids, tissue extracts and in vivo systems, supporting both fundamental neuroscience research and clinical diagnostics.

Research from Nature Portfolio

An automated platform combining hydrophilic interaction liquid chromatography with high-resolution mass spectrometry has been demonstrated for simultaneous detection of small neurotransmitters and neuropeptides in microlitre-scale blood samples. By employing zwitter-ionic stationary phases for on-line SPE and capillary LC, the system achieves sharp peak shapes and low carry-over across compounds of varying polarity and size. Automatic filtration and back-flushing permit uninterrupted analysis of hundreds of samples without consumable replacement. This streamlined workflow reduces manual preparation, lowers per-sample costs and delivers precise quantification of classes ranging from monoamines such as serotonin and adrenaline to peptide hormones including oxytocin and vasopressin.

Analytical Techniques for Neurotransmitter Measurement publication trend

The graph below shows the total number of articles in analytical techniques for neurotransmitter measurement across all publications each year (not limited to Nature Index journals).

Technical terms

Liquid chromatography–mass spectrometry (LC-MS): A technique combining liquid chromatographic separation with mass analysis of ionised compounds to identify and quantify analytes.

High-performance liquid chromatography with electrochemical detection (HPLC-ECD): Chromatographic separation paired with an electrode-based detector that measures redox-active neurotransmitters.

Surface-enhanced Raman spectroscopy (SERS): A vibrational spectroscopy method that uses nanostructured metal surfaces to greatly amplify Raman scattering signals of target molecules.

Microdialysis: A sampling approach employing a semipermeable probe to collect extracellular fluid from living tissue for continuous monitoring of analytes.

Solid-phase extraction (SPE): A sample preparation technique using sorbent materials to isolate and concentrate analytes from complex biological matrices.

References

1. Liquid chromatography-mass spectrometry platform for both small neurotransmitters and neuropeptides in blood, with automatic and robust solid phase extraction. Scientific Reports (2015).
2. Spectroscopic Determination of Acetylcholine (ACh): A Representative Review. Topics in Current Chemistry (2023).
3. The High-Precision Liquid Chromatography with Electrochemical Detection (HPLC-ECD) for Monoamines Neurotransmitters and Their Metabolites: A Review. Molecules (2024).
4. Plier Ligands for Trapping Neurotransmitters into Complexes for Sensitive Analysis by SERS Spectroscopy. Biosensors (2023).