Since the MULTI-SPE M08 uses a positive pressure and the pressure in each channel is equal, it is more stable and easier to control than the vacuum negative pressure solid phase extraction unit. For more information on the MULTI-SPE M08 positive pressure solid phase extraction unit, please click on the following link: http://?cpid=144 Or contact us directly: Tel/87628609 email: Tablet Camera,2.0Mp CCTV Cameras,1.0Mp CCTV Cameras,Ip Camera H264 Series TD Cloud Security Co.Ltd , https://www.cctvcameraexpert.com
Solid phase extraction of plasticizers in liquor
The detection of various plasticizers in alcoholic liquor once again pushed food safety issues to the forefront. The detection method of plasticizer (phthalate) in liquor has become a concern of the quality inspection department and related testing institutions.
According to reports, the 3 plasticizers detected by the testing agency in Jiugui Liquor are dihexyl phthalate (DEHP), diisobutyl phthalate (DIBP) and dibutyl phthalate. The ester (DBP) is 0.49 mg/kg, 0.41 mg/kg and 1.08 mg/kg, respectively. Among them, DBP obviously exceeded the standard of 0.3 mg/kg, exceeding the standard by 260%.
It can be seen from the table below that the three phthalate compounds detected in this liquor have a log Kow value of more than 4, which is a non-polar compound and can be extracted and separated by a non-polar solid phase extraction column. . Since ethanol in liquor has good solubility for phthalate compounds, too high a concentration of ethanol in the sample will cause the target compound to be adsorbed well by the non-polar SPE column. Therefore, the liquor sample is solidified. The phase must be diluted with water before extraction. The degree of dilution is preferably such that the ethanol content of the sample does not exceed 5%. The elution solvent may be selected from methanol, ethyl acetate or a non-polar mixed solvent.
Physical and chemical parameters of three phthalate compounds
Plasticizer name
English abbreviations
Solubility in water
g/L
Log Kow
(log P)
Dihexyl phthalate
DEHP
0.00034
4.89
Diisobutyl phthalate
DIBP
5
4.11
Dibutyl phthalate
DBP
0.013
4.57
Since the plasticizer is an intrinsic component in plastic products, samples or solvents should be avoided as much as possible during the experiment to reduce the possibility of errors in the test results. In view of this factor, it is not recommended to use a fully automated solid phase extractor until the cross-contamination of the phthalate compound is not confirmed in the system.
The company's MULTI-SPE M08 positive pressure solid phase extraction unit is suitable for a variety of sample extraction / purification applications, as well as solid phase extraction of phthalates in white wine. The device can use a glass solid phase extraction column (such as Gelela's Cleanert DEHP glass column) or a glass chromatography column, and a glass collection tube. All the wetted parts are glass, and the eluted components are collected directly from the glass column in the glass. In the test tube (without any tubing or valves to avoid cross-contamination).