A charged membrane extraction device and its application method
A technology of extraction device and electrical device, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of complex processing, abuse, interference, etc., and achieve the effect of simple operation
Active Publication Date: 2021-06-29
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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Problems solved by technology
National standards have set strict regulations on the scope and limits of preservatives and sweeteners. However, there are still abuses of these additives. Some manufacturers will add several preservatives and sweeteners that are lower than the standard amount of the limit. use to evade supervision
National testing standards include GB / T 5009.28-2016 "Determination of Benzoic Acid, Sorbic Acid and Sodium Saccharin in Food", but the pretreatment process is complicated and easily interfered by macromolecular substances such as proteins in the matrix
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[0028] The present invention will now be further described with reference to the accompanying drawings.
[0029] The volume of the sample bottle 7 is 25ml. The cap 9 of the graphite electrode 8 extends through the cap 9 of the sample bottle 7 into the sample bottle 7 . A polypropylene hollow fiber membrane with a membrane inner diameter of 600 μm, a membrane wall thickness of 200 μm and a membrane pore diameter of 0.2 μm was used as the hollow fiber membrane 12 . Soak the polypropylene hollow fiber membrane 12 in n-octanol for 5 minutes, then take out the polypropylene hollow fiber membrane 12 and use a syringe to remove the excess n-octanol liquid on the surface and the inner cavity, and rinse gently with deionized water. On its surface, the inner cavity of the polypropylene hollow fiber membrane 12 is filled with air to further remove n-octanol in the inner cavity to obtain a polypropylene hollow fiber membrane supported by n-octanol as the membrane wall. Similar to polypro...
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Abstract
The invention discloses an electrified membrane extraction device and its use method, comprising a sample bottle, a graphite electrode, a gold electrode, a hollow fiber membrane, and an electrified device. One end of the graphite electrode passes through the bottle cap of the sample bottle and extends into the sample bottle Among them, the other end is electrically connected to the cathode of the power supply device. One end of the hollow fiber membrane is sealed and extends into the sample bottle through the bottle cap, and the other end is detachably fixed on the bottle cap. The bottle cap has a cavity connected to the hollow fiber membrane. The anode of the power supply device is electrically connected to the gold electrode, the gold electrode extends into the hollow fiber membrane from the opening, the hollow fiber membrane is filled with sodium hydroxide solution, and the micropores of the hollow fiber membrane wall are filled with n-octanol , there is a gap between the graphite electrode and the hollow fiber membrane. The electrified membrane extraction device of the present invention integrates sampling, extraction and concentration, removes the interference of macromolecular substances such as protein in beverages, is simple to operate, and can effectively extract food additives benzoic acid, sorbic acid and sodium saccharin in beverages Wait.
Description
technical field [0001] The invention relates to the technical field of food additive detection, in particular to an electrified membrane extraction device and a method for using the same. Background technique [0002] With the rapid development of modern analytical techniques, the time-consuming, laborious and inefficient traditional sample pretreatment methods have become a bottleneck restricting the development of the entire analytical chemistry. Therefore, the development of fast, efficient, simple and green sample preparation new technologies is of great significance for eliminating matrix interference and improving the sensitivity and accuracy of the method. Membrane extraction technology based on hollow fiber membrane is a brand-new pretreatment technology that has developed rapidly in recent years. It integrates sampling, extraction and concentration, with simple operation, low cost and less organic solvent consumption. The electrified membrane extraction technology ...
Claims
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IPC IPC(8): G01N30/02G01N30/06
Inventor 诸寅蔡强
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG