Under the ultraviolet light, the white paper containing the phosphor showed a blue color; while the mushroom without the phosphor maintained the original color.
Yesterday, the staff was testing the bacterial concentration on the hands of a child.
On the occasion of the June 1st, the “Food Safety Testing Room Children's Open Day†was held yesterday. The testing experts passed two experiments on the spot to explain the scientific hand washing methods.
Yesterday, more than 20 children walked into the Carrefour (Beijing) Food Safety Level 1 testing room. Experts demonstrated the UV detectors to see if the paper contained fluorescent agents and bacteria tests before and after washing. "The bacteria in my hand turned out to be so many." Before a child washed his hands, he detected more than 50,000 bacteria on his hands.
Contrast found that the number of bacteria before and after washing hands up to hundreds of times, and if the washing is not careful, the method is not correct, the number of bacteria on the hands between the two children is also dozens of times different. Previously, the laboratory staff trained the bacteria before and after washing hands 24 hours ago. In the culture dish labeled "before washing hands", various bacteria such as mold and Staphylococcus aureus have been produced.
Experiment 1 Stationery paper should not be too white
Experimental purpose: Observe whether paper or food has fluorescent whitening agent
Experimental procedure: The tester placed a sample of white paper, Pleurotus eryngii, Pleurotus ostreatus, and Flammulina velutipes under ultraviolet light to observe the color change.
Experimental results: The white paper showed a bright blue under the lamp, while the color under the three mushroom sample lamps did not change.
Interpretation: Test experts reminded that many parents like to buy papers that look very beautiful and bright white for children. This kind of white paper has more fluorescent whitening agents, because it shows bright blue, if the fluorescent agent is stained When you go to a child's hand, if you don't wash your hands and eat food, you will ingest it, so the stationery paper for the children should not be too white.
2 After washing your hands properly, the bacteria will be reduced by tens of thousands.
Experimental purpose: to test the change of total bacteria before and after washing hands
Experimental procedure: In the chromatographic chamber, the inspector took out an applicator stick and spun from a palm to the tip of a child's hand, and then detected the number of bacteria. About 10 seconds, the instrument reading showed that the number of bacteria in the hand before washing the child was 14,889. Subsequently, the child washed his hands with hand sanitizer for 20 seconds, and then sampled and detected, the number of bacteria has been reduced to 5,369. The other child had more than 50,000 bacteria before washing hands. The testers taught them how to wash their hands properly. After washing their hands, the bacteria dropped to 314.
Interpretation: Liu Wei, a testing expert and food safety manager in Beijing, reminded that the correct hand washing procedure should be to use 7 parts of hand soap, soap, hand, back, tiger's mouth, finger joints, knuckles, fingertips and wrists. When the time lasts for more than 20 seconds, then rinse with water, dry and dry, in order to effectively reduce the bacteria in your hands.
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