Hello,

It would be good to know some more details. For example, is it only the water in the sweat or are you (also) interested in other compounds of sweat like sodium or lactic acid?

Researchers in Prof. Richard Zare's laboratory have developed a fast, accurate mass spectrometry technique for distinguishing an individual's gender, age or ethnicity based on the chemical composition of sweat. This invention utilizes desorption electrospray mass spectroscopy imaging (DESI-MSI) to analyze both the fingerprint pattern and the composition of lipids and other metabolites from the sweat on the print. Next, a machine learning model (gradient boosting tree ensemble) further classifies the sample and predicts at a range of personal characteristics based on the DESI-MSI profile. Initial studies have correlated patterns of metabolites in sweat with age, gender and ethnicity. The model could be expanded to classify by medical condition or drug usage and it could be used to classify sweat samples collected alone without fingerprints. This invention could be a powerful tool to harness the enormous amount of chemical information provided by mass spectrometry for forensic or diagnostic testing.@Ruddhida Vidwans

I have measured sweat samples using NMR spectroscopy. Many hydrophilic metabolites for the metabolic profile could be identified.