An LC-MS/MS method for simultaneous analysis of up to six monoamines from brain tissues

Area of Science:

• Neuroscience
• Analytical Chemistry
• Biochemistry

Background:

• Monoamines like dopamine and serotonin are vital neuromodulators regulating mood, movement, sleep, and cognition across species.
• The nervous system, from mammals to insects, contains diverse monoamines with varying polarity, posing analytical challenges.
• Accurate quantification of these neurochemicals is essential for understanding brain function and dysfunction.

Purpose of the Study:

• To develop and validate a single-run liquid chromatography-tandem mass spectrometry (LC-MS/MS) method.
• To quantify six distinct monoamines: dopamine (DA), serotonin (5-HT), octopamine (OA), tyramine (TA), melatonin (MT), and N-acetylserotonin (NAS).
• To enable simultaneous analysis of these neurochemicals in precious biological specimens like Drosophila and mouse brain extracts.

Main Methods:

• Liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS).
• Extraction of monoamines from dissected Drosophila and mouse brain tissues.
• Quantitative analysis covering an analytical range of 0.25 to 5.0 ng/mL.

Main Results:

• Successful simultaneous quantification of six key monoamines in a single LC-MS/MS run.
• Demonstrated method's applicability to both insect (Drosophila) and mammalian (mouse) brain tissues.
• Established an analytical range suitable for detecting neurochemical levels in biological samples.

Conclusions:

• The developed LC-MS/MS method provides a robust and efficient tool for simultaneous monoamine quantification.
• This methodology is valuable for neuroscientific research involving comparative studies across species.
• Enables precise measurement of critical neuroactive compounds from limited biological samples.