Beijing Food and Drug Administration dispelled rumors: in the past three years, sampling did not find "plastic cabbage"

True cabbage pickles absorb moisture and are smooth, while plastic films do not absorb water and are not smooth. Cartographic: China
Qiu Yu recently, a video of "tearing cabbage is made of plastic film" circulated on the network. BEIJING, China News from the Beijing Municipal Food and Drug Administration was informed that in the past three years, Beijing sampling of purple vegetable samples did not find "plastic purple vegetables." In addition, the Beijing Food Safety Monitoring and Risk Assessment Center in the laboratory of purple vegetables and plastic identification, plastic film to make purple vegetables is not reliable.
Official sampling did not find "plastic cabbage
"Is there any purple vegetables made of plastic film on the market" is a matter of concern to everyone, the Beijing Municipal Food and Drug Administration in the past three years on the results of the sampling of purple vegetables, the current sample did not find the existence of plastic film counterfeit phenomenon.
Zhang Weimin, deputy director of the risk monitoring department of the Beijing Municipal Food and Drug Administration, said that according to the statistics of the supervised sampling database, a total of 278 samples of purple vegetables have been sampled in Beijing in the past three years, and nearly 30 items of preservatives such as benzoic acid, sorbic acid, lemon yellow, sunset yellow waiting color agent, lead, inorganic arsenic, methylmercury and other heavy metals, polychlorinated benzene, nitrite, sulfur dioxide, pathogenic bacteria, mold and other nearly 30 items.
results showed that 3 samples were not qualified, the pass rate was 98.9%, the non-conformity factor was 2 samples of lead exceeded the standard, 1 sample of sulfur dioxide exceeded the standard.
Laboratory testing distinguish between cabbage and plastic
in order to verify that "plastic film to make purple vegetables is not reliable", the Beijing Food Safety Monitoring and Risk Assessment Center in the laboratory of 45 purple vegetable samples and 3 plastic film samples were identified.
Beijing Food Safety Monitoring Center, Dr. Wu Yantao said, in view of the recent network heat transmission of "making purple vegetables with plastic bags" video, taking into account the quality characteristics of purple vegetables and plastic bags and the differences between the two, the Beijing Food Safety Monitoring and Risk Assessment Center developed a purple vegetable identification program, using amino acid analyzers, infrared spectrometers, scanning electron mirrors and other technical means, 45 purple vegetable samples were authentic and have certain characteristics of the detection.
analysis of the results showed that there were significant differences in micromorphic appearance of cabbage and plastic bag sections from the outside. The section structure of cabbage is complex, with two layers of film on each side, sandwiched between neatly arranged purple vegetable cells, while the section structure of plastic bags is dense, only the tear marks left when cutting, there is no complex multi-stage structure.
results of the scanning electroscope of the purple vegetable sample section. Source: Beijing Food and Drug Administration.
the results of the scanning electroscope on the sample section of the plastic bag. Source: Beijing Food and Drug Administration.
From the spectral map, the infrared spectral map of different brands of cabbage samples is similar, with protein characteristic absorption peaks near 1643cm-1 and 1539cm-1, while plastic bags have no characteristic absorption peaks in the above bands.
the composition, high protein and amino acids were detected in purple vegetables, and the content distribution was more concentrated, and high organic arsenic, phosphorus and calcium were concentrated, with an average content of 35.8 mg/kg, 5989 mg/kg and 4124mg/kg; proteins and amino acids were not detected in plastic bags, and the corresponding organic arsenic, phosphorus and calcium content was 1mg/kg, 0.05mg/kg and 1038mg/kg, respectively. Organic arsenic and phosphorus can effectively distinguish between adulterated plastic bags in cabbage.
Wu Yantao said that according to the test results, 45 samples of purple vegetables sent for inspection did not find the problem of plastic bag fraud, the problem of deliberate use of waste plastic to make purple vegetables should not exist.
tips, how
pick good-quality purple vegetables when you buy them every day? Wu Yantao suggested that when you buy purple vegetables can first pinch, smell, good quality purple vegetables are generally dark brown or purple-brown, have a natural luster, feel fluffy elastic, no odor.