April 4th 2024
In a recent study, scientists evaluated different microextraction methods using green analytical chemistry (GAC) metrics.
December 14th 2023
Next-Generation Sorbent-Based Extractions with Metal-Organic Frameworks
March 1st 2021Sorbent-based extractions using metal-organic frameworks (MOFs) have several advantages, notably selectivity. How do these extractions work, and where are they most useful? We look into the current state of the art.
Turning Up the Heat: The Effect of Temperature on Analytical Extractions
January 1st 2021Temperature is frequently employed to enhance analytical extractions, especially with solid samples or volatile analytes. Using temperature to enhance analytical extractions continues today with more recently developed techniques, which we explore.
Nanomaterials Have Come to Stay: An Overview of their Use as Sorbents in Sample Preparation
This article reviews how nanomaterials are being used in a variety of sample preparation techniques, such as dispersive solid-phase extraction (dSPE), solid-phase microextraction (SPME), stir-bar sorptive extraction (SBSE), and matrix solid-phase dispersion (MSPD).
The LCGC Blog: Inexpensive, Quick, and Selective: Seeking the Holy Grail of Sample Extraction
September 8th 2020Oliver Napoleon Hill (1883– 1970) was an American self-help author once described as ”the most famous conman you’ve probably never heard of” (1 ). Conman maybe, but there is a quote of his that I believe to be particularly true when considering sample preparation for chromatography techniques; ”The one who tries to get something for nothing generally winds up getting nothing for something.”
Electromembrane Extraction with Vials of Conducting Polymer
In electromembrane extraction (EME), the target analyte is extracted from an aqueous sample across a supported liquid membrane (SLM) and analyzed using LC. Through the study presented here, we demonstrate the principles of the technique and test its performance.
Overview of Methods and Considerations for Handling Complex Samples
April 1st 2020When working with complex samples, we need effective approaches to deal with matrix interferences. Here, we outline methods of sample preparation, on-line sample treatment, and instrument tools that can help. We also provide examples of applications and guidance for how to evaluate the best option for your complex sample.
Paper-Based Sorptive Phases Prepared by Dip Coating
February 1st 2020Paper-based sorptive phases are promising tools in sample preparation because of their high surface-to-volume ratio, porosity, and versatility. This article discusses the synthesis of paper-based sorptive phases by dip coating. This procedure has allowed a wide variety of phases coated with polymers, nanoparticles, and their combination to be synthesized. This article presents the synthesis, types of coatings, and extraction devices, to highlight the versatility and potential of these materials to the analytical community, particularly for sample preparation.
Sampling: The Ghost in Front of the Laboratory Door
February 1st 2020Sampling can be the most demanding part of an analysis. Anybody in charge of sampling needs a good understanding of the composition of the material to be investigated, its heterogeneity (or homogeneity, in simple cases), and the chemical properties of the analytes. Sampling procedures must be described in detail. Detecting the bias of a sampling procedure can be difficult; this fact is trivial, but it must not be forgotten.
Sample Preparation Goes Subzero: Ice Concentration Linked with Extractive Stirrer (ICECLES)
January 1st 2020A new technique, ICE concentration linked with extractive stirrer (ICECLES), provides highly efficient isolation of trace compounds from aqueous samples. ICECLES combines freeze concentration with stir-bar sorptive extraction into a seamless analytical extraction methodology.
Modern Sample Preparation Methods for Food and Environmental Laboratories
February 6th 2019Traditional sample preparation method development can often be laborious and costly. Understanding the underlying concepts of the technique can help food and environmental laboratories develop methods in notoriously complex matrices, faster, more efficiently, and provide better chromatography. With the presence of many unique matrices and analytes, methods such as QuEChERS, supported liquid extraction (SLE), or solid-phase extraction (SPE) provide the necessary adaptability for many types of extractions. With customizable methods to work with unique matrices and with the addition of automation, extractions can be improved to save time and provide consistent recoveries.
Recent Advances in Solid-Phase Microextraction, Part I: New Tricks for an Old Dog
March 1st 2018A look at recent advances in SPME, such as increasing the sorbent surface area available for extraction, accommodating direct analysis by mass spectrometry, and sorbent overcoating to resist fouling by sugars and lipids