Accurate mass matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometry is used to determine the identity of a naturally occurring substituted flavin adenine dinucleotide (FAD) of nitroalkane oxidase isolated from Fusarium oxysporum. Accurate mass measurements (1−2 ppm) combined with an elemental composition search identifies the unknown FAD substituent as nitrobutane. The use of internal and external calibration in accurate mass MALDI-TOF is discussed.
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Edmondson et al. (1997) studied this question.