DELAYED EXTRACTION UV & INFRARED WAVELENGTH MALDI MS

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We have designed and constructed a robust and inexpensive high voltage pulsing system for carrying out delayed-extraction MALDI time-of-flight MS measurements. We have used this system to run both of our linear time-of-flight instruments either in continuous-extraction (CE) or delayed-extraction (DE) modes. Comparison of UV- and IR-MALDI using CE and DE has led to a number of interesting discoveries which we will report in a manuscript in preparation. Thus, for example, we have found that IR-MALDI produces demonstrably cooler protein ions than UV-MALDI and that the tails on both IR- and UV-MALDI spectra originate from multiple association of Na cations with the protein.