Peanuts contain the digestible carbohydrates sucrose, fructose, and glucose, but they also often include non-digestible raffinose, stachyose, and verbascose in varying quantities that pass through the human digestive tract unchanged and are subject to fermentation in the lower gut. For determinations of carbohydrates in food, a method for carbohydrates in peanuts and peanut butters with minimal sample preparation and without requiring pre- or post-column analyte derivatization. The method uses high-performance anion-exchange chromatography with pulsed amperometry detection (HPAE-PAD).
Per- and polyfluoroalkyl substances (PFAS) is the collective name for synthetic fluorinated compounds. Here we describe our lab's results from the EPA draft Method 1621 multi-lab study results to screen for PFAS using adsorbable organic fluorine by combustion ion chromatography. The recovery of 4 types of PFAS from wastewater samplers are discussed. This method was found to be robust, precise, and accurate. Additionally, a technical note is included to describe tips and tricks for successful implementation of EPA Method 1621.
This technical note is intended to demonstrate the use of the charged aerosol detector for liposome analysis with ASTM method E3297-21
Drinking water perfluorinated and polyfluorinated alkyl substances (PFAS) studies have typically targeted PFOS and PFBA and other PFAS. Here we discuss the development of an analytical method using an automated SPE system and LC-MS/MS for determination of twenty-five PFAS compounds following the guidelines provided by U.S. EPA Method 533. We have demonstrated that the automated SPE system provides reliable determination of PFAS in large-volume aqueous samples and saves time, solvent, and labor, while ensuring high reproducibility and productivity for analytical testing laboratories.
