Understanding the interactions that stationary-phase chemistries provide will help you choose the most appropriate blend of interactions to address a given separation challenge.
Environmental sample analysis by large-volume injection (LVI) in combination with liquid chromatography–tandem mass spectrometry (LC–MS-MS) is described for polar and nonpolar analytes in both aqueous samples and organic extracts.
Have a problem with your LC system? Maybe applying a little "DDT (Don't Do That)" may help.
Some might consider gas chromatography (GC) a mature technique. However, several substantial advances in GC technology in the past few years have proven that there is still room for innovation.
By LCGC Editors
We recently spoke to Gary Duncan and Wendy Russell of the Rowett Institute of Nutrition & Health in Aberdeen, Scotland, about the significance of phytochemical bioavailability to human health and the important role of liquid chromatography linked to tandem mass spectrometry (LC–MS-MS) in their research.
In most countries, herbal medicinal products (HMPs) are introduced into the market without proper scientific evaluation or enforced safety and toxicological studies.
A multiresidue method has been developed and validated for the analysis of methylxanthines (caffeine and its metabolites) and cotinine in human plasma.
When pyrolyzed, macromolecules will decompose into smaller fragments that can have the appropriate volatility for gas chromatography (GC) separation and analysis.
In this installment of "Sample Prep Perspectives," we cover some of the basic scientific principles behind solid-phase extraction (SPE) to allow the correct mode of extraction to be selected through an understanding of how analytes interact with and are separated by the sorbent.
Green analytical chemistry is a widely recognized concept that has led to the development of new analytical methods with reduced environmental impact and minimized analyst occupational exposure. This article presents the most recent progress in the development of greener sample preparation and chromatographic separation techniques.
By Tony Taylor
There are often times in my work when I need to 'mess about' with column dimensions and particle morphologies. For 'mess about' read improve or transfer.
I have been at The University of Texas at Arlington for almost 10 years, and I have taught approximately seven different classes in my time here. Yet, the one that I have had the most opportunities to teach, and the most time to reform, is our junior/senior-level Instrumental Analysis (IA) course.
Detecting estrogens at trace concentrations in biological fluids is key to understanding their role in the induction — and treatment — of disease. Researchers from the University of Texas Arlington, USA, have developed a method using restricted access-media (RAM) that enables the detection of trace levels of oestrogen's using LC–MS–MS without liquid–liquid extraction (LLE) or solid-phase extraction (SPE).
Scientists have published a novel method using reversed-phase high performance liquid chromatography (HPLC) with evaporative light scattering detection (ELSD) for the isolation and determination of nonvolatile methyl-branched hydrocarbons (MBCHs) from insect cuticles.
In response to recent accusations levied by the New York State Attorney General’s office that herbal supplements sold by four major retailers contained little or no primary ingredient, the supplements industry is planning further testing of the affected products.
Pharmaceutical and personal care products (PPCPs) entering water supplies have been widely studied, but there is little information on the activity of these compounds in swimming pool water. Researchers have applied a PPCP analysis method previously developed for the detection of 32 PPCPs in wastewater to survey indoor swimming pools in the USA.
On Monday, February 2, the New York State Attorney General’s office sent letters to four major retailers accusing them of selling fraudulent herbal supplements and demanding that they remove the products from their shelves. To the surprise of many analytical chemists, however, the accusations were based on DNA barcoding technology rather than chromatographic analysis.
Tuesday, March 31, 2015 — 8:00 am PDT/ 11:00 am EDT/ 4:00 pm GMT/ 5:00 pm CET
Featured: Applications of Ion Chromatography
You know the classic uses of ion chromatography (IC), like measuring inorganic ions in drinking water. But do you know what else it can do?
Instrument manufacturers try to convince us that mass spec is just another detector. Most of us who work with LC-MS know that’s simply not the case – they can be maintenance intensive, unforgiving and generate complex information. When they’re not working it can be difficult to work out exactly where the problem lies. Here’s some advice to point you in the right direction
A question about column dead volume. If the hold-up volume (time) is the extra-column dead volume expressed in time or volume. What is the column dead volume and how can it be calculated?
CHROMacademy delivers key knowledge quickly in bite-size modules, and to prove this here is our seven point guide to understanding atmospheric pressure chemical ionization.
It is of particular importance to reduce extra column volumes when using small volume columns or UHPLC. However, where do these extra column volumes come from, how can they be minimized, and what effect do they have on chromatography?