Detection of melamine in infant formula and grain powder by surface-assisted laser desorption/ionization mass spectrometry

作者：Hsieh Yi Ting; Chen Wen Tsen; Tomalova Iva; Preisler Jan; Chang Huan Tsung^*

来源：Rapid Communications in Mass Spectrometry, 2012, 26(12): 1393-1398.

DOI：10.1002/rcm.6238

We have developed a method for the determination of melamine (MEL), ammeline (AMN), and ammelide (AMD) by surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) using gold nanoparticles (Au NPs). The major peaks for MEL, AMN, and AMD at m/z 127.07, 128.05, and 129.04 are assigned to the [MEL + H]+, [AMN + H]+, and [AMD + H]+ ions. Because the three tested compounds adsorb weakly onto the surfaces of the Au NPs through AuN bonding, they can be easily concentrated from complex samples by applying a simple trapping/centrifugation process. The SALDI-MS method provides limits of detection of 5, 10, and 300 nM for MEL, AMN, and AMD, respectively, at a signal-to-noise ratio of 3. The signal variation for 150-shot average spectra of the three analytes within the same spot was 15%, and the batch-to-batch variation was 20%. We have validated the practicality of this approach by the analysis of these three analytes in infant formula and grain powder. This simple and rapid SALDI-MS approach holds great potential for screening of MEL in foods.

• 出版日期2012-6-30