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Recent News

New Book Chapter on 2D-LC by D. Stoll is Available Now

Dwight Stoll has written a book chapter, “Introduction to Two-Dimensional Liquid Chromatography – Theory and Practice”, in the Handbook of Advanced Chromatography /Mass Spectrometry Techniques, edited by Michal Holcapek and Wm. Craig Byrdwell, and published by Elsevier (ISBN 978-0-12-811732-3). The chapter provides an introductory view of the state-of-the-art of two-dimensional liquid chromatography, and goes on [more…]

Dr. Stoll presents invited seminar at Iowa State University, Department of Chemistry

Associate Professor of Chemistry Dwight Stoll gave an invited seminar at Iowa State University Department of Chemistry on January 27, 2017. The talk, entitled “At the heart of the matter – Virtues, challenges, and progress associated with the interface in two-dimensional liquid chromatography”, featured research results from the work of Gusties Ray Sajulga (’17), Carston [more…]

Dwight Stoll wins EAS Young Investigator Award for 2017

Associate Professor of Chemistry Dwight Stoll will receive the 2017 EAS Young Investigator Award. This award is sponsored by the Eastern Analytical Symposium, one of the premier conferences in analytical chemistry in the U.S., and recognizes ‘…those who have made significant practical contributions to the field of analytical chemistry that have helped advance the state [more…]

Short Course on 2D-LC for Pharmaceutical Analysis at EAS 2016

This year (2016) at the Eastern Analytical Symposium in Somerset, NJ we will offer a short course on Two-Dimensional Liquid Chromatography for Pharmaceutical Analysis. The full list of short courses can be found here, and a description of our specific course can be found here.

Groskreutz (’12) comes back, to help us move forward

Two weeks ago Steve Groskreutz, Gustavus alum from 2012 and Stoll Laboratory alum, came back to Gustavus to install equipment that we will use as part of a collaboration with his Ph.D. group (Prof. Stephen Weber) at the University of Pittsburgh. During his three-day visit, JJ Akin caught up with him and asked Steve to [more…]

2D-GC in the news…

Here is a recent, interesting article about the use of two-dimensional gas chromatography to decaying flesh, which has a variety of applications.

Literature Review: Homochiral Porous Organic Cage with High Selectivity for the Separation of Racemates in Gas Chromatography

The chirality of a molecule can vastly alter the reactions and chemical behaviors of that molecule, especially in stereospecific environments. There have been a variety of examples demonstrating that a change in chirality can make seemingly identical molecules either medically helpful or equally very detrimental to human health. With this distinction, it becomes necessary to [more…]

Literature Review: Sensitive Redox Speciation of Iron, Neptunium, and Plutonium by Capillary Electrophoresis Hyphenated to Inductively Coupled Plasma Sector Field Mass Spectrometry

Nuclear reactions are a powerful method by which to produce energy. It is common knowledge, however, that the use of nuclear reactions to create energy also results in potentially hazardous nuclear waste. Thus, consideration must be given not only to the safety of nuclear waste repositories, but also to the possibility of detrimental compounds escaping [more…]

Literature Review: Electrospun Carbon Nanofiber Modified Electrodes for Stripping Voltammetry

Anodic stripping voltammetry (ASV) is a powerful technique capable of analysis of trace metallic components without the need for separation methods. It offers the potential for selectivity and sensitivity at relatively low cost and could be portable and therefore potentially offer analysis at the sight of sample collection. However, restrictions on the use of mercury [more…]

Literature Review: Exploring Fluorous Affinity by Liquid Chromatography

The unique interactions of highly fluorinated compounds have been observed and found to be useful in a surprising array of methods. Not only have these fluorinated compounds—Teflon perhaps being the most well-known—been taken advantage of for their characteristic inertness, but such compounds have been found to be instrumental in many highly selective separation techniques. Such [more…]

Literature Review: Construction of an Ultrahigh Pressure Liquid Chromatography- Tandem Mass Spectral Library of Plant Natural Products and Comparative Spectral Analyses

This study introduced a library of mass spectra for 289 plant natural products. These include flavonoids, isoflavonoids, and phenylpropanoids. Mass spectral data was obtained using a triple quadrupole mass spectrometer coupled to an ultrahigh pressure liquid chromatograph. The specificity of the triple quadrupole detector allows the detection of a single mass fragment after fragmentation in [more…]

Review article by Dr. Stoll appears in the journal Bioanalysis

A review article by Dr. Stoll entitled “Recent Advances in 2D-LC for Bioanalysis” was published in the December issue of the journal Bioanalysis. (doi: 10.4155/bio.15.223).

Literature Review: Controlled sp2 Functionalization of Boron Doped Diamond as a Route for the Fabrication of Robust and Nernstian pH Electrodes

The glass pH electrode has commonly been used for pH measurements, but limitations of this instrument include alkali errors, fragility, and continuous calibration. Because of these issues, efforts have been made to create robust pH electrodes for use under a range of conditions. This study presents a boron doped diamond (BDD) with sp2 carbon-quinone regions [more…]

Literature Review: Dispersive Raman Spectroscopy and Multivariate Data Analysis To Detect Offal Adulteration of Thawed Beefburgers

Meat, as defined by the European Food Standards Agency, is the skeletal muscle including natural fats and connective tissues of various species. Only certain amounts of fat and connective tissues can be counted towards the meat content of a product, and all excess must be listed separately in the nutrition label ingredient list. Such [more…]

Literature Review: Nickel Oxide Nanoparticle-Deposited Silica Composite Solid-Phase Extraction for Benzimidazole Residue Analysis in Milk and Eggs by Liquid Chromatography–Mass Spectrometry

Solid phase extraction (SPE) is a common technique used for both pre-concentrating as well as simplifying complex solutions. Normally this extraction is of analytes of a singular type (hydrophobic, ionic). Benzimidazoles are a class of drugs that are used for the treatment of parasites in food processing such as in cows and laying chickens. When [more…]

Literature Review: SFC-APLI-(TOF)MS: Hyphenation of Supercritical Fluid Chromatography to Atmospheric Pressure Laser Ionization Mass Spectrometry

Atmospheric pressure laser ionization (APLI) involves a two photon excitation process using a near UV high power laser. The second excitation step results in ionization of the compound for use in a mass spectrometer. APLI is very selective for polycyclic aromatic hydrocarbons (PAH) while common solvents and other potential interferents are not ionized. Recently, APLI [more…]