Methyl pyrazines mass spectrometry

Isolation and identification of pyrazine alkaloids (Table III) have been achieved in most cases by a combination of gas chromatography and mass spectrometry (35,36,38,69,97,142). Methyl-, 2,3,6-trimethyl-, and tetramethylpyrazines (23a, 21a, and 22a) from the melon fly are identified by utilizing a solid sampling technique in conjunction with gas chromatography-mass spectroscopy (147). Methylpyrazines show the molecule ion as a base peak. Fragmentation proceeds mainly by the loss of HCN or CH3CN from the molecular ion (141). Eth-... 

Hydroxy-l -methyl-1,2,3,4-tetrahydro-8H-pyrido [1,2-a] pyrazin-8-one was determined in zymolite of pork by the solid-state phase microextraction and gas chromatography-mass spectrometry (05MI37). 

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