Peas, beans and some other plant seeds contain proteins, called globulins, which have been shown to act as a defence against insects and other herbivores. Coffee beans contain large amounts of globulins, so scientists in Brazil studied the beans to assess their potential for warding off insects.
A method is presented for the analysis of epicatechin (EC), epigallocatechin (EGC), epigallocatechingallate (EGCG), myricetin, quercetin, keampferol and cis and trans resveratrol. An ALEXYS Analyzer is used with a binary gradient. Detection limits of 2-5 nmole/L have been obtained.
Coelutions using one dimensional chromatography are often observed in flavour and fragrance analysis.
Generic methods based upon chromatography with full-scan mass spectrometry (MS) detection are maturing.
Some of the threats to food safety and the measures in place for protection are discussed
Two-dimensional polyacrylamide gel electrophoresis reveals regulatory effects of dietary polyunsaturated fatty acid supply on protein expression in early development.
The authors use headspace SIFT-MS to target and identify volatiles in various malt aldehydes. The specificity and speed are compared to current methodology.
Large-volume Injection Coupled to Comprehensive Gas Chromatography – Time-of-Flight Mass Spectrometry for the Analysis of 3-MCPD Esters in Edible Oils
An overview of current chromatography-based food toxicant screening is presented.
Polychlorinated biphenyls (PCBs) are a class of extremely persistent industrial chemicals manufactured for use in electrical transformers, capacitors, inks, paints, pesticides, dust control or insulating fluids. Estimates have put the total global production of PCBs on the order of 1.5 million tons.
As anyone involved in the field of analytical chemistry can tell you, food safety is a topic that is garnering more and more attention, not only in separations laboratories and in technical sessions at conferences and symposia around the world, but in the most telling place of all: the mainstream media.
Liquid chromatography coupled to mass spectrometry (LC–MS) using electrospray ionization (ESI) is a powerful analytical tool for the analysis of a wide molecular weight range of polar, semivolatile, and thermally labile compounds.
Mass spectrometry plays an increasingly significant role in the analysis of residues and contaminants in food. Here we will illustrate how the combination of ultrahigh-pressure liquid chromatography (UHPLC) and high-resolution time-of-flight-mass spectrometry (TOF-MS) is used to generate a screen of veterinary drug residues in products of animal origin. The use of UHPLC–TOF-MS and dedicated, workflow directed software allows rapid screening for large numbers of residues and automated quantification of positive samples. In addition, we illustrate how the data generated using MSE acquisition mode enable critical structural information to be collected, which offers additional selectivity and confirmatory data for compound identification and facilitates elucidation of the structure of newly discovered compounds.
QuEChERS Multiresidue Pesticide Method for Wine - UCT apps note
The need for better methods for vitamin D analysis in a wide variety of foods is a good showcase for the advantages that ultrahigh-pressure liquid chromatography (UHPLC) can provide. The availability of systems that can operate as high as 1200 bar and an extensive range of UHPLC column choices provide the flexibility needed to rapidly develop fast vitamin D separations that can be adapted to meet the challenges of testing a diversity of food types
This article will demonstrate the feasibility of analysing complex mixtures without any prior sample preparation by making use of the high resolving power of both UHPLC and mass spectrometry.
Greater peak capacity and resolution can be easily obtained for gradient analysis of complex samples by using sub-2 µm particles in longer column lengths.
Design of a FID/MS Splitting for MS Detection in The First and Second Dimension of a Multidimensional GC–MS System
Determining pesticide residues by GC-MS
Driving under the influence is a serious criminal offense. To prove a suspect guilty calls for solid scientific evidence. The generally accepted method is to accurately measure the blood alcohol content. This article presents a static headspace-gas chromatography method, which offers reliable qualitative analysis, reproducibility, and short run times to allow for high throughput.
This month's installment of "Innovations in HPLC" discusses the use of HPLC for these recent threats to health and safety.
Click here to view the December Food Safety Analysis newsletter in its entirety.
Seventeen priority pesticides were extracted from baby food, using dispersive solid phase extraction which helped to remove interfering matrix components.
The wide variety of matrices, the number of potential contaminants, and the pressure of meeting regulatory standards all contribute to the difficulty of food safety analysis.
SPME-GC–MS with on-column injection can be successfully employed for flavour profiling of food samples. The on-column injector of the GC-2010 can be used for SPME without any modifications, only an external ring adapter was used to facilitate the injection. The data can be compared with sensorial data of food.
