In recent years, there have been worrying problems in the field of food safety in China. Henan lean meat event, dyeing steamed bread incident, fake beef, etc., more dangerous is "melamine", which not only appears in milk, but also exists in eggs. These food safety issues, like the current global financial crisis, have swept the entire land and have had a serious impact on people's health.
In response to food safety, the inspection standards of food inspection agencies are becoming more and more strict. The daily workload of food inspectors is very large. In the vast majority of chemical analysis, sample preparation takes up most of the time. One study showed that laboratory staff used only 55% of the time to properly prepare samples during laboratory analysis. This data suggests that new breakthrough technologies can greatly shorten this process. In food testing, extraction is a typical experimental step. In the extraction process, extraction is usually required three times. If a sample that is difficult to stratify is encountered, the worker is required to oscillate for a long time during the artificial oscillation process. Large, the time spent on this experimental operation is very long. In such a day, a lot of time is spent in the manual oscillation operation. Are you worried about spending too much time in the extraction process? The separatory funnel oscillator can easily solve this lab trouble and help you save a lot of extraction time. Let's take a look at some specific applications of the split funnel oscillator:
1. Analytical method for hygienic standard of edible hydrogenated oil and margarine
GB/T 5009.77-2003 specifies the analytical method for the hygienic standard of edible hydrogenated oil and margarine. In the sample processing experiment in which the nickel and copper contents in the margarine were tested, the margarine sample was added with 30 mL of 0.5 mol/L hydrochloric acid, heated in a boiling water bath, and extracted three times with a separatory funnel. If the time required to oscillate once is 3 min, the oscillation time is 9 min. If 10 samples are taken one day, three samples are measured in parallel, a total of 30, so that the time taken for the extraction oscillation in one day is 270 min. In this experimental process, if a split-nozzle oscillator is used instead of manual oscillation, the extraction of 10 samples can be completed at one time, and it can be completed in three times. At the same time, it has a function of timing. As long as the staff is set up, other experiments can be performed. The staff can save a lot of precious time in a day, and more importantly, the extraction effect of the separatory funnel oscillator is better than the manual operation, which greatly improves the work efficiency.
2. Determination of benzoic acid in fruits and vegetables
GB/T 12289-90 specifies the national standard method for the determination of benzoic acid in fruits, vegetables and products. In the step of extracting benzoic acid, it is prescribed to extract the sample solution with ethyl mi. The conventional extraction method is to use artificial oscillation method, and the artificial oscillation process can be replaced by shaking with a separatory funnel oscillator.
3. Determination of penicillin in apple hawthorn products
GB/T 5009.185-2003 specifies the hygienic standard for penicillin in apple and hawthorn products. In the penicillin extraction experiment step, it is prescribed that the juice is extracted with an equal volume of ethyl mi-mi. In this experimental procedure, a split funnel oscillator can be used instead of artificial oscillation.
In summary, the application of the separatory funnel oscillator in the food industry is:
1. Determination of residual content of insecticidal ring in rice
2. Analytical method for hygienic standard of edible hydrogenated oil and margarine
3. Determination of benzoic acid in fruits and vegetables
4. Determination of penicillin in apple hawthorn products
5. Extraction of aroma components of soy sauce HEMF
6. Extraction of copper and iron from wine
7. Extraction of specimens for cadmium analysis of fish
8. Separation and extraction of useful chemical substances in tar
9. Lipid extraction of watermelon seeds
10, rancidity test of oily foods
11, yin extraction in black tea
12. Determination of PCB storage capacity of fish
13, food additive measurement
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