186 



Table 4-3 Characteristic neutral losses of compound classes. 



Neutral 

 loss (Da) 



PCI produced parent ion 



NCI produced parent ion 



1 



aldehydes, carboxylic acids, 

 aromatics 



ketones, carboxylic acids 



2 



aldehydes, carboxylic acids, 

 aromatics 



carboxylic acids, alcohols 



14 



alkanes, alkenes, alkyl chains 





17 



amines 





18 



ketones, carboxylic acids, 

 alcohols 





26 



aldehydes, cyanides/nitriles 





27 



cyanides/nitriles 





28 



aldehydes, ketones, carboxylic 

 acids 



aldehydes 



30 



aldehydes, ketones, carboxylic 

 acids 





36 



alcohols (diols, triols) 





42 



ketones 





44 





carboxylic acids 



46 



carboxylic acids, amino acids 





78 



aromatics 





