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Table 1 Characteristic fragment ions and corresponding m/z values of dehydroabietic acid (DHA) and 7-oxo-dehydroabietic acid (7-oxo-DHA) as methyl esters

From: Characterization and Identification of Natural Terpenic Resins employed in “Madonna con Bambino e Angeli” by Antonello da Messina using Gas Chromatography–Mass Spectrometry

Ion

DHA

7-oxo-DHA

M

314

328

[M - CH3]+

299

313

[M - COOCH3]+

255

269

[M - HCOOCH3]+

 

268

[M - CH3HCOOCH3]+

239

253