Aflatoxins are metabolites from molds such as Aspergillus flavus and Aspergillus Parasiticus. Afl atoxins are classified as mycotoxins, they are among the most potent human carcinogens, found mainly in foods and feed of plant origin. High concentrations of afl atoxins have been found, for example, in pistachios, figs and cereals and aflatoxins have also been…
Disposable Pipette Extraction (DPX) has been shown to be a rapid, efficient and reproducible method for performing solid-phase extraction (SPE) of pesticides from fruits and vegetables. DPX is a unique SPE method because the solid phase sorbent is contained inside a disposable pipette tip and is mixed with sample solutions. This mixing allows for the…
Fatty acids are of key importance to the food industry. Especially long chain polyunsaturated fatty acids (LC PUFA) are receiving more and more attention due to their positive infl uence on human health. LC PUFA refined from natural oils are frequently added to food products to gain a positive health effect. Since LC PUFA are…
Static (equilibrium) headspace sampling is commonly used for GC determination of volatiles in solid and liquid samples. Since this technique relies on the analyte partitioning between the sample and headspace and uses a fixed injection volume it may not provide adequate detection limits, particularly for higher molecular weight, higher boiling analytes, and for polar analytes…
One of the most important aspects of reducing pesticide exposure is monitoring of pesticide residues in foods. A number of analytical methods have been developed, many of them based on traditional liquid-liquid extraction, gelpermeation or solid phase extraction in combination with GCMS or LC-MS. Recently, the QuEChERS (quick, easy, cheap, effective, rugged and safe) sample…
Fat determination is one of the key analyses performed in food industry and in public food monitoring programs in order to control production processes, to ensure accurate labelling, and to monitor food safety. Therefore, a fast and reliable procedure for routine determination of fat is in great demand. Using the Cavieziel® Method, based on the…
Identification of important trace components in complex samples like fragrances, natural products, petroleum fractions or polymers can be challenging. Achieving the mass on column and resolution necessary to locate and identify trace components using a single chromatographic separation can be difficult if not impossible. A selectable 1D/2D GC-MS confi guration using Agilent capillary fl ow…
Direct injection for gas chromatographic profiling of alcoholic beverages is usually preferable, but where spirits and liquors contain appreciable amounts of non-volatile material, some mode of pre-treatment may be required to avoid both inlet and column contamination. This consideration applies in particular to products aged for extended periods in wooden barrels and especially products containing…
QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation methods were developed to help monitor pesticides in a range of food samples [1]. These methods are quite labor intensive, however, since they include several manual steps, such as shaking, centrifugation, and dispersive SPE. If dispersive SPE clean up of QuEChERS type extracts could be…
The Deepwater Horizon oil rig explosion and the subsequent massive oil spill is expected to be the worst offshore oil catastrophe in United States history and is now beginning to impact fragile ecosystems, air and water quality, and food supplies. Protecting humans from consuming foods contaminated with oil, while minimizing economical impacts for fisheries, is…
Applicable for the determination of naphthalene, fluorene, phenanthrene, anthracene, fl uoranthene, pyrene, benz[a]anthracene, chrysene, benzo[a]pyrene in seafood tissues including fi nfi sh and shellfi sh. The method is expected to be applicable to alkylated PAHs and related compounds in similar matrices. Limits of quantitation were shown to be < 1ng/g. Download PDF
Fruit and vegetable extracts that are produced following the well established QuEChERS method [1,2] typically contain a significant amount of involatile matrix material. After several injections of such extracts into the GC, sufficient matrix residue will be present in the GC inlet liner to lower or sometimes even increase the response of certain pesticide compounds…
A method for the determination of trace amounts of off-flavor compounds such as 2-methyl isoborneol (MIB), geosmin and 2,4,6-trichloroanisole (TCA) in drinking water is described based on dynamic headspace coupled to selectable onedimensional or two-dimensional gas chromatography – mass spectrometry with simultaneous olfactory detection (DHS1D/2D GC-O/MS). Automated DHS using a Tenax TA packed tube as…
This paper describes a novel ethylene glycol- (EG) and silicone based combined sorbent phase developed for stir bar sorptive extraction (SBSE) using the GERSTEL Twister™. EG-Silicone, polyacrylate (PA), and polydimethylsiloxane (PDMS) Twisters were used separately to perform SBSE on whisky, white wine and multivitamin juice in order to determine the usefulness of these phases for…
One of the most important aspects of reducing pesticide exposure is monitoring of pesticide residues in foods. A number of analytical methods have been developed, many of them based on traditional liquid-liquid extraction in combination with GC-MS or LC-MS. The QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation methods have been developed to…
The extraction of Afl atoxin B1 residues from contaminated corn samples using disposable pipette extraction (DPX) is described. DPX is a solid-phase extraction (SPE) technique that is based on loosely contained sorbent inside a pipette tip fitted with a screen. This device provides faster extraction because only minimal conditioning steps are needed. A weak anion…
In this study, a method was developed for quantitative determination of seven phenolic compounds in scotch whisky. Two different whisky brands were analyzed by Stir Bar Sorptive Extraction (SBSE), based on novel EG-Silicone Twisters, combined with thermal desorptiongas chromatography-mass spectrometry (TD-GC-MS). Direct Large Volume Injection (LVI) -GC-MS was used as reference method. Optimized methods for…
This application note describes two automated methods for screening of extractable compounds from materials for food packaging, medical or technical purposes. The first method is based on automated liquid extraction performed by the GERSTEL MultiPurpose Sampler (MPS), the second involves thermal desorption of the material in question in the GERSTEL Thermal Desorption Unit (TDU). Both…