LCGC North America Application Note Alert Having trouble viewing this email? Click here LC Why Are C18s So Different? Big differences exist between C18 columns, despite the use of the same stationary phase. Here, we discuss the mechanisms that contribute to this variation.   LC–MS Quantitation of Ethyl Glucuronide and Ethyl Sulfate in Urine Using LC–MS/MS This application note highlights a short, robust, and accurate quantitative method for measuring EtG and EtS in urine and surine samples using triple quad LC–MS. Characterization of TSKgel® FcR-IIIA-NPR HPLC Column by Top-Down Mass Spectrometry TSKgel FcR-IIIA-NPR is an affinity chromatography column for the analysis of IgG glycoforms. The resulting elution profile of the glycoprotein mimics ADCC activity. Cannabis Potency Using Low-Cost HPLC A simple isocratic HPLC method for the testing of Cannabis. The DLC-10 is a small footprint, easy to use and low-cost HPLC system. The included fixed wavelength detector has good signal response when using the 214 nm Zinc lamp.   GC StayClean® Ion Source Stability In this study, the stability of LECO’s StayClean ion source was tested on the Pegasus BT benchtop GC–TOFMS instrument—results show the source’s durability. Analyze More Semivolatile Samples per Shift Using Split Injection Using split injection can increase sample throughput for semivolatiles analysis because it provides faster oven cycle times due to the use of higher initial oven temperatures.     GC–MS Thermal Extraction-GC–MS Analysis of Food Packaging VOCs in packaging for filled cookies, crackers, and soft candy are determined for assessment of compound migration potential.