CHRONECT Workstation MOSH/MOAH
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CHRONECT Workstation MOSH/MOAH Product information

CHRONECT Workstation MOSH/MOAH Product information Introduction Undesirable mineral oil residues are found in numerous food or food contact materials. These substances can be divided into two classes: Saturated (MOSH - mineral oil saturated hydrocarbons) and aromatic hydrocarbons (MOAH - mineral oil aromatic hydrocarbons). While the first substance class accumulates in the human body, the second compound class is suspected to contain carcinogenic substances. These substances can enter food via numerous contamination pathways. These include gas phase migration or contact with lubricants...

CHRONECT Workstation MOSH/MOAH Product information fraction are introduced into the GC and removed by evaporation via the interface before the gas chromatographic separation. By reacting these components with mCPBA before injection into HPLC, the olefins are converted to polar epoxides and thus separated from the less polar MOAH in HPLC. The process of epoxidation at room temperature in ethanol as solvent was developed by Marco Nestola during his work for Axel Semrau and is now part of the current standards and recommendations of the European Union. This reaction can be carried out manually...

CHRONECT Workstation MOSH/MOAH Product information Since this manual process is very time-consuming and requires re-injection of the sample, Axel Semrau has developed an online purification using an aluminum oxide column. An additional HPLC pump is integrated into the system and the MOSH fraction is purified automatically after separation from the MOAH fraction. This online approach allows the determination of MOSH and MOAH with simultaneous epoxidation and AlOx purification in one run and has found its way into the current DGF method as an alternative to the manual approach. Figure 4:...

CHRONECT Workstation MOSH/MOAH Product information Determination limits and standards In the analysis of MOSH and MOAH, the limit of determination depends very much on the actual matrix. This is due to interfering substances that cannot be completely removed even with epoxidation and aluminum oxide cleanup. Therefore, no general limit of quantitation can be defined for an LC-GC system. If no interferences by interfering substances occur, the CHRONECT Workstation MOSH/MOAH can be used to achieve a limit of quantification in edible oils of 2 mg/kg and sometimes lower without further sample...

CHRONECT Workstation MOSH/MOAH Product information Evaluation The evaluation of MOSH/MOAH analyses differs in some points from a classical gas chromatographic evaluation. First, the area of a single peak must not be determined. The entire hump of the mineral oil contamination must be quantified. Secondly, peaks on top of the hump must be subtracted depending on the type of samples, since they are considered to be not originating from the mineral oil and would thus falsify the result. For a more precise evaluation of the sample, it is also necessary to obtain partial results for certain...

CHRONECT Workstation MOSH/MOAH Product information customer's laboratory. In this way the analytical accuracy is verified. The system is ready for use immediately after installation. Summary The CHRONECT Workstation MOSH/ MOAH is based on 10 years of experience with MOSH/MOAH analysis. It is the result of continuous development in close coop- eration with 150 customers. The compliance with current norms and standards together with simple, automatic result evaluation offers routine suitability. A support team specially trained in MOSH/MOAH offers users assistance at all times. Thus, the...

CHRONECT Workstation MOSH/MOAH Product information The CHRONECT Workstation MOSH/MOAH is a development by Axel Semrau. PI CHRONECT Workstation MOSH/MOAH – Status: March 2021 Subjet to technical changes Axel Semrau GmbH & Co. KG Stefansbecke 42 45549 Sprockhövel Germany Tel.: +49 2339 / 12090 Fax: +49 2339 / 6030 www.axelsemrau.com info@axelsemrau.de