Pesticides and Antibiotics
Accurate results by choosing the appropriate sample preparation techniques.
There are statutory limits for the innocuous and technically unavoidable quantities levels of pesticides that may be present in foodstuffs. Residual antibiotics in foodstuffs is unproblematic from a toxicological point of view, however there is still a risk of the growth and reproduction of resistant germs.
Combined LC/MS and GC/MS multi-residue methods cover most compounds, the critical factor is the choice of a suitable sample preparation to separate the target substances from the matrix. The many automation possibilities of the GERSTEL Multi Purpose Sampler (MPS) range from standard steps for handling liquid samples to evaporation, weighing, centrifuging or ultrasound options to filtration and various extraction techniques such as solid phase extraction (SPE). The GERSTEL Twister can also be used to enrich contaminants.
Even well purified sample extracts can still contain considerable quantities of matrix components that accumulate in the gas chromatography injection liner and then impair the accuracy of further analyses. The matrix that interferes with analysis is removed from the Cooled Injection System (CIS) by replacing the liner at a specified intervals. This replacement in conjunction with the task in the CIS can be conveniently automated with the GERSTEL Automated Liner Exchange System (ALEX).