Matrix Assisted Rapid Evaporative Ionization Mass Spectrometry.

Area of Science:

• Analytical Chemistry
• Biotechnology
• Mass Spectrometry

Background:

• Rapid evaporative ionization mass spectrometry (REIMS) is a versatile technique for direct analysis of biological samples.
• Standard REIMS can yield moderate chemical information from certain sample types due to limitations in signal intensity.
• Sample preparation is often not required, but signal enhancement is needed for broader applications.

Purpose of the Study:

• To introduce and evaluate a matrix-assisted version of REIMS (MA-REIMS) to enhance signal intensity.
• To investigate the underlying processes of MA-REIMS.
• To demonstrate the utility of MA-REIMS in critical applications such as intrasurgical tissue identification.

Main Methods:

• Aerosolization of a pure solvent (e.g., isopropanol) mixed with the sample aerosol generated by rapid evaporation.
• Comparison of signal intensity between standard REIMS and MA-REIMS.
• Experimental investigation of the MA-REIMS process and its benefits.

Main Results:

• MA-REIMS achieved signal intensity enhancements exceeding 2 orders of magnitude compared to standard REIMS.
• The technique reduces fouling of the REIMS source.
• MA-REIMS allows for simple, continuous introduction of calibration compounds for accurate mass measurements.

Conclusions:

• MA-REIMS significantly boosts the chemical information obtainable from biological samples using REIMS.
• This enhanced technique expands the scope of REIMS applications, including real-time intrasurgical tissue analysis.
• MA-REIMS offers improved accuracy and reduced source maintenance, making it a more robust analytical tool.