Abstract Reversed phase high performance liquid chromatography (HPLC) interfaced to electrospray tandem mass spectrometry (MS/MS) is commonly used for the identification of peptides from proteolytically cleaved proteins embedded in a polyacrylamide gel matrix as well as for metabolomics screening. HPLC separations are time consuming (30-60 min average). costly (columns and mobile phas... https://www.roneverhart.com/Cookies-X-G-Pen-Roam-Portable-E-Rig-Vaporizer/