Simultaneous determination of phenolic acids and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one in wheat (Triticum aestivum L.) by gas chromatography-tandem mass spectrometry

A procedure using gas chromatography and tandem mass spectrometry (GC-MS-MS ) has been developed for the identification and quantification of some alle lochemicals in wheat (Triticum aestivum L.). The quantities of allelochemic als in wheat shoots ranged from 2.9 to 110 mg per kilogram of dry shoot res idues. Compared with gas chromatography-mass spectrometry (GC-MS), the GC-M S-MS technique significantly increased instrument selectivity and sensitivi ty, thereby providing more reliable quantitation results in the determinati on of the phytotoxic compounds examined during this allelopathy research. ( C) 1999 Elsevier Science B.V. All nights reserved.