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A novel method utilizing ambient thermal desorption ionization with a direct analysis in real‐time source integrated with mass spectrometry (DART‐MS) was established and applied to the rapid analysis of 3‐hydroxy‐3‐methylglutaric (3‐HMG) acid in the neonatal urine. Instrument parameter settings were optimized to obtain high sensitive and accurate determination of 3‐HMG acid. The use of helium gas...
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