Showing 11 - 20 of 103 results

Analysis of DEHP in Drinking Water by HPLC-DAD [AN0064]

DEHP, bis-(2-ethylhexyl)phthalate, is one of the most prominent phthalate contaminants in drinking water. DEHP is also used as a plasticiser during plastic manufacturing. When ingested, it is a cancer-causing hazard and presents a high risk of liver function disorders. For this reason DEHP is a banned substance during food production, under the Restriction of Hazardous Substances (RoHS) Directive by the EU[1], and levels must be monitored. Although a banned substance, commercial sport drink manufactures have been known to substitute palm oil, a common emulsifier, for the more cost effective DEHP.
SCION Instruments developed a method for the identification of DEHP using HPLC and a Diode Array Detector (DAD)

Analysis of Flavour Compounds in Milk Flavourings by SPME-GC-MS [AN0033]

Dairy based milk powders offer a healthy alternative to fresh milk whilst also being readily available to incorporate into milk flavoured products during
manufacturing. Whilst consumers expect highly soluble and great tasting products, manufacturers need reliable high quality instrumentation for determining the right chemical composition of their products. Gas chromatography is the most commonly used chromatography technique for analysing food products, especially milk powders, for the identification of aroma compounds. The identification of the aroma compounds is vital as they constitute the taste and smell of all food products.
Solid Phase Micro Extraction (SPME) is a solid phase extraction technique that involves the use of a fiber coated in a polymer or sorbent extracting phase. The fiber is exposed to a sample where sample analytes are absorbed onto the fiber coating. The fiber coating should be chosen to suit the type of analyte in the sample. During injection into the GC inlet, desorption occurs and the analytes are introduced to the analytical system. The quantity of analyte extracted by the fiber is proportional to its concentration in the sample as long as equilibrium is reached.

Analysis of Flavours in Beer with SCION ChromSync Software

One of the most widely purchased beverages in the world is beer. With the consumer market so large, breweries are developing their products to have its own distinct flavour. It is vital that breweries test and monitor the flavour compounds during the production process to ensure that the same flavours are consistently achieved. The volatile compounds that make up the flavour composition must therefore be profiled batch to batch.
Gas chromatography (GC) is often the instrumentation of choice for the analysis of flavour active volatiles in beer. Compass Chromatography Data System (CDS) is a state of the art chromatography software platform that controls GC instruments whilst offering automated processing and reporting of results. ChromSync is an application add on specifically for the flavour and fragrance industry. ChromSync has the ability to determine the ‘fingerprint’ of flavour compounds in beer. The individual ‘fingerprints’ are then compared with a reference standard. ChromSync rapidly compares peak retention time as well as area% profiles of complex chromatograms, making processing volatile flavour profiles effortless. Additionally, ChromSync instantly confirms product batch to batch reproducibility whilst reporting any missing compounds and calculating the degrees of similarity.
This application note demonstrated the ease of using Chromsync with CompassCDS for the comparison of five beer samples analysed via headspace gas chromatography (HS-GC) with flame ionisation detection (FID).

Analysis of Free and Total Glycerin in B-100 Biodiesel Methyl Esters (ASTM D6584)

Introduction. The American Standard, ASTM D 6584, is the standard test method commonly used for the quantitative determination of free and total glycerin content in Fatty Acid Methyl Esters (FAME), typically intended for pure biodiesel or as a blending component for domestic and diesel fuels. Total glycerol content is calculated from the results obtained. The method is suitable for FAME from rapeseed, sunflower and soybean oils*. A metal capillary GC column was specifically used for this high temperature method.

Analysis of Greenhouse Gases by Gas Chromatography, May 2019.1 [AN012]

Nitrous Oxide (N2O), Carbon Dioxide (CO2) and Methane (CH4) are considered to be very powerful greenhouse gases. These gases reflect in the atmosphere, stopping the incoming and outgoing radiation that warms the Earth, thus causing the greenhouse effect. Continuously measuring the greenhouse gases gives insight into the source of the emissions, helping us fight climate change. A SCION 456 GC was custom configured specifically for the analysis for all three gases in a single matrix of atmospheric air containing water vapour.

Analysis of Mineral Oils Utilising Temperature Programmed Large Volume Injection, May 2019.1 [AN020]

INTRODUCTION: Mineral oil hydrocarbons are typically found in water, foods and soils. These hydrocarbons can be extracted using a variety of solvents, with the most popular being hexane and petroleum ether. As concentrations can be very low, sample enrichment is often required. However, SCION instruments developed a method that simply uses a Large Volume Injection (LVI) technique to simplify sample pre-treatment whilst dramatically increasing throughput. The Hydrocarbon Index (HOI) is the total amount of compounds which can be extracted from water samples using a non-polar solvent. The solvent must have a boiling point between 39℃ and 69℃, thus replacing the use of halogenated solvents. Halogenated solvents and high concentrations of polar substances can interfere with the determination of the HOI. In addition, the compounds must not absorb on Florisil and must elute between ndecane and n-tetracontane. The method is suitable for HOI determinations in concentrations above 0.1mg/L in water samples. This application note describes the highly efficient analysis of mineral oil hydrocarbons in water using the SCION 456 GC equipped with a Programmable Temperature Vaporiser (PTV). The system is very well suited to the DIN-EN-ISO 9377 method.

Showing 11 - 20 of 103 results