Showing 11 - 20 of 86 results

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).

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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.

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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.

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Analysis of Low Level Oxygenates (LOWOX) in Liquefied Petroleum Gas (LPG), May 2019.1 [AN009]

Introduction: The determination of sub to high ppm levels of ethers, alcohols, aldehydes and ketones in different hydrocarbon matrices is a recurring challenge in the petroleum refining and petrochemical industry. The SCION low level oxygenates analyser is designed and optimised to quantify ppm and sub levels of ethers, alcohols, ketones and hydrocarbons in gas, liquid and LPG samples. Oxygenates can be present in hydrocarbon streams for a variety of reasons. For example, methanol is added to crude oil to reduce the formation of hydrates during transportation and storage. Clean up processes like
hydro -treating are used in an attempt to remove oxygenated compounds. Even at sub ppm trace levels, oxygenates quickly degrade or destroy expensive
catalysts in downstream polymerisation processes.

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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.

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Analysis of Sulphur Compounds in Various Liquefied Petroleum Gases, May 2019.1 [AN006]

The low-level analysis of sulphur containing components such as Hydrogen Sulphide (H2S), COS (carbonyl sulphide) and mercaptans, in liquified petroleum gas (LPG), is challenging. First of all, the system has to be inert; stainless steel adsorbs H2S and other sulphur containing components. Secondly, the column used must be able to separate the components of interest. Although a highly selective pulsed flame photometric detector (PFPD) is used in sulphur mode, the bulk hydrocarbons tends to quench the PFPD signal.

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Analysis of Total Petroleum Hydrocarbons using Temperature Programmed Large Volume Injection, May 2019.1 [AN010]

INTRODUCTION: Mineral oils are typically found in water, foods and soils. These mineral oils can be extracted using different solvent; most popular are hexane and petroleum ether. As concentrations can be very low, some sort of sample enrichment is often used, e.g. rotary evaporation. If, however, a Large Volume Injection (LVI) technique is used, sample pretreatment becomes easier and sample throughput can be increased significantly. This application note describes the analysis of mineral oils (or Total Petroleum Hydrocarbons / TPH) using the Scion 456-GC gas chromatograph equipped with a Programmable Temperature Vaporizer (PTV) Injector and the Select™ Mineral Oil column. The column stationary phase was tuned for separation and stabilised for high
temperature operation. The upper temperature limit of the column is 400 °C. This system is suited to the DIN-ENISO 9377-2 method that replaced DIN H53.

Showing 11 - 20 of 86 results