Application Note
Direct Analysis of Intact Proteins using the Advion Touch Express™ Open Port Sampling Interface (OPSI) with the expressionL Compact Mass Spectrometer
![Direct Analysis of Intact Proteins using the Advion Touch Express<sup>™</sup> Open Port Sampling Interface (OPSI) with the expression<sup>L</sup> Compact Mass Spectrometer](https://www.advion.com/wp-content/uploads/Screenshot-2023-02-13-at-4.14.37-PM.png)
Touch Express™ is a new sampling device for mass spec analysis using a technique developed by Gary Van Berkel and Vilmos Kertesz of Oak Ridge National Laboratory – the Open Port Sample Interface (OPSI). This fast, versatile sample inlet paired with the expression® Compact Mass Spectrometer (CMS) provides simple molecular weight determination of surfaces, solids and liquids in < 30s.