In 2003, the US Department of Agriculture Anastassiades and Lehotay et al. Proposed a new sample pretreatment technique based on acetonitrile extraction and dispersion solid phase extraction. Compared with the traditional sample pretreatment, this method is Quick, Easy, Cheap, Effective, Rugged, and Safe, to be called QuEChERS method as a result.
Since the advent of the QuEChERS method, the foreign analysts have conducted in-depth research and method validation, and have improved the methodology, which has now became the standard method for the Association of Official Analytical Chemists (AOAC) and the European Committee for Standardization (CEN).
SiO(Spin integrated with Oscillation) 6512 automated Sample Preparation System is an automatic program control analysis sample preparation system, which will be integrated with three-dimensional oscillation like a character “8” and centrifugation, to achieve the extraction, clean-up and transformation of the samples more effectively .
To fully exert the instrument's flexibility and reliability characteristics, reducing the labor intensity ,increase the accuracy of sampling, so as to easily control the whole process of extracting samples for the user.
The SiO-6512 automated Sample Preparation System could be used to extract samples by vortex effect through the powerful three-dimensional oscillation like a character “8”, and could separate extracts by the on-situ centrifugal function more than 4500g. And Matched with the specific extraction kits, a new automatic QuEChERS processing methods was developed, the workflow diagram as follow:
The pre-treatment applications for Mercury and other heavy metal elements speciation determination
Mercury in aquatic products is presented in a variety of different compounds. Among them, the normal species are such as Hg2 +, methylmercury (MetHg) and ethylmercury (EtHg) and other organic mercury species, these compounds are are all toxic, but MetHg is the most toxic and migratory. In order to ensure food safety, it is necessary to determine not only the total content of mercury in various aquatic products but also the distribution of various mercury speciation. In contrast to the conventional method for the total content determination.
To avoid the kinds of speciation transformation, a violent digestion method must be avoided, only the relatively gentle extraction method is accepted. Therefore, the oscillation extraction become the most effective method for this kind of sample preparation. A large number of experiments have been carried out to verify that using our SiO-6512 in accordance with the QuEChERS-like method to extract mercury samples can achieve rapid, efficient, high recovery rate for the Hg speciation sample extraction.
Biological sample homogeneous
The SiO-6512 with three-dimensional oscillating function is compared with the regular oscillating biological sample homogenizer, which can effectively accomplish the homogeneous function of the biological sample. and also can achieve more larger samples volume, more sample quantities, complete the high-throughput biological samples homogeneous with the special sample tray.
