"Leather milk powder" is difficult to detect in melamine

It is difficult to detect melamine by mixing protein powder from old leather shoes with milk

The melamine incident two years ago has left parents feeling terrified. Recently, the news of "leather milk" has made people talk about the color change. On February 12th, the Chinese government website listed the “2011 Fresh Milk Product Quality and Safety Monitoring Plan” issued by the Ministry of Agriculture, which not only requires the detection of melamine in milk powder, but also the detection of hydrolyzed leather protein.

Leather hydrolysed protein is to use abandoned animal leather products and even animal hair to make powder after hydrolysis, and then mixed into milk to increase its protein content. Long-term consumption of "leather milk" may cause cancer.

Yesterday, the Guangzhou Municipal Quality Supervision Bureau said that Guangzhou has not received relevant complaints or investigated and dealt with related cases for many years. However, at present, there is no relevant national standard for the inspection of "leather hydrolyzed protein powder" by domestic quality supervision departments. Experts believe that it is not excluded that some lactic acid beverage companies illegally use unqualified hydrolyzed protein, but dairy products companies are unlikely to use hydrolyzed protein on a large scale.

In 2009, Zhejiang investigated and punished "leather milk"

"After the melamine milk powder was banned, some illegal businessmen added the new toxic substance leather hydrolyzed protein powder to the milk powder to improve the protein composition." Recently, such a sensational news spread quickly on the Internet, causing the attention of many netizens, everyone ’s attention Focus again on the safety of dairy products.

Nandu reporters looked up a number of similar news on the Internet and found that the description of the related incidents came from a domestic media report in 2009. From April 1 to 25, 2009, the City Express reported that "Leather Hydrolyzed Protein Powder" was detected in multiple batches of milk in Chenhua Dairy Company of Jinhua City, Zhejiang Province. The legal representative of the enterprise, Mao Jianhua, and three others were detained.

On February 12, the Chinese government published the "Notice of the Ministry of Agriculture on Carrying Out the 2011 Fresh Milk Quality and Safety Monitoring" issued by the Ministry of Agriculture on January 5 this year, of which "2011 National Fresh Milk Quality and Safety Monitoring Plan" It is proposed that the testing items of the safety monitoring plan include melamine, leather hydrolyzed protein and alkaline substances. Among them, all samples must be tested for melamine, and 30% of the samples should be tested for leather hydrolyzed proteins and alkalis.

A large amount of news about "leather milk" appeared on the Internet this time, which was triggered after synthesizing the above two messages.

However, according to the website of the Ministry of Health, Wang Junxun, director of the Dairy Management Office of the Ministry of Agriculture, said that in 2010, the Ministry of Agriculture organized a random inspection of 7406 batches of raw milk samples, and no leather hydrolyzed protein was detected. Prohibited additives such as alkaline substances and raw materials, the quality and safety of fresh milk nationwide are generally good.

"Leather milk powder" detection is difficult for melamine

The detection of hydrolyzed leather protein is more difficult than melamine because it is a protein. At present, the detection method prescribed by the Ministry of Agriculture is mainly to check whether the milk contains leather hydrolyzed protein, which is a unique ingredient in animal collagen, but not in milk protein, so once detected, it can be considered to contain leather hydrolyzed protein .

In response to the online situation, the reporter contacted the Guangzhou Municipal Quality Supervision Bureau yesterday. Relevant staff members said that Guangzhou has not received relevant complaints or investigated and dealt with related cases in so many years. However, the actual situation is that the relevant national quality supervision departments have no relevant national standards for the detection of "leather hydrolyzed protein powder". At the same time, the staff also told reporters that in actual operation, because the leather contains the metal "chromium" component, so if it is found to be higher in the test, it will generally attract attention.

In 2009, Zhejiang Jinhua Chenyuan Dairy Co., Ltd. was found to contain dairy products containing "leather hydrolyzed protein powder". The dairy products involved were mainly the "Chenyuan" brand produced by the nominal "Zhejiang Jinhua Chenyuan Dairy Co., Ltd." Sweet milk milk beverages, AD calcium milk beverages, milk-flavored beverages; "Sunshine Garden" brand lactic acid beverages, high-calcium lactic acid bacteria beverages, and sweet milk milk beverages are mostly produced between February and March 2009. Yesterday Nandu visited some large supermarkets in Guangzhou and found no products with similar brands.

The Ministry of Health had explicitly banned the processing of dairy products with hydrolyzed protein

According to related reports on the Internet, as early as 2004, the national health department found in food hygiene supervision and inspection that some enterprises used leather waste and other raw materials to produce edible gelatin and hydrolyzed protein (used as milk powder raw materials) using industrial raw materials such as lime, hydrochloric acid, and hydrogen peroxide. ). Gelatin and hydrolyzed protein prepared from non-food materials contain a variety of harmful residues, which will cause harm to human health after consumption.

In order to strengthen food hygiene supervision, on May 27, 2004, the Ministry of Health issued the Ministry of Health Announcement No. 10 of 2004, which explicitly banned the production of edible gelatin and hydrolyzed protein using non-food raw materials such as leather waste and hair; Gelatin and hydrolyzed protein are used as raw materials to produce and process dairy products, children's food and other foods.

On March 6, 2009, the State Food and Drug Administration issued a notice on "Recent work and requirements for the national rectification of cracking down on illegal addition of non-edible substances and abuse of food additives" (Wei Jianfa [2009] No. 21). Among them, cracking down on the addition of leather hydrolysates is a top priority in the production of milk and dairy products.

Leather hydrolyzed protein powder

Old leather shoes and old sofas contain toxic substances such as dioxins

Used leather goods, leather shoes, handbags, sofas and other waste leather products or corner scraps of leather goods factory, after washing, soaking, adding lime and hydrochloric acid, and then cooking at high temperature for a long time, the gum in the leather will be dissolved In water, add hydrogen peroxide to bleach, and then cool the solution, the extracted is "leather hydrolyzed protein", but other harmful substances such as heavy metals will also be mixed into it. The Ministry of Health had explicitly banned hydrolyzed protein as a raw material for the production and processing of dairy products.

Professor Le Guowei of the School of Food Science and Technology at Jiangnan University said that the so-called leather hydrolyzed protein powder refers to the use of leather, hair, hair follicles and other substances that cannot be used in the leather production process, or even the hair-like substances collected at the animal slaughtering site, processed by chemical methods To hydrolyze it into protein. Although the protein hydrolyzed by this method is similar to the "meat jelly" ingredients obtained by cooking pigskin soup and pig's trotter soup at home, but due to the introduction of heavy metal chromium in the process, the raw materials themselves bring such as dioxins Toxic substances such as English and PCBs make it impossible to use them as food or pharmaceutical grade additives. The production and processing of these products are mostly small underground workshops. It is difficult to purify the products to meet the national standards, which is why leather hydrolysed proteins have become "toxic" additives.

Expert statement

Leather hydrolyzed protein powder, another melamine?

Will leather hydrolyzed protein powder be another melamine? Wang Dingmian, vice president of Guangdong Dairy Association, said that some lactic acid beverage companies illegally use unqualified hydrolyzed protein, but dairy products companies use hydrolyzed protein on a large scale. Very small.

Before the melamine incident, hydrolyzed protein had been used as a dairy additive. As early as 2005, Shandong and other places exposed the incident that "regularly-produced dairy products are difficult to enter the market, and the milk made from hydrolyzed protein sells very well." At that time, the Shandong industrial and commercial department seized at least 28,000 pieces of hydrolyzed products. There are more than 200 small factories engaged in the production of egg white dairy products. But after 2005 the situation is much better.

Compared with illegal use in dairy products, illegal use in the feed industry is earlier and more complicated. For example, adding leather hydrolyzed protein powder to imported fishmeal was almost an open secret in the feed industry.

Illegal use of hydrolyzed protein additives has also been discovered in Guangdong Province. Wang Dingmian said that in 2006, 38 enterprises across the country were found to add furfuric acid illegally, and at least 3 companies in Guangdong.

"After the melamine incident, it was not ruled out that some companies once again used hydrolyzed protein as an alternative additive." Wang Dingmian said, such as the illegal addition incident discovered by Zhejiang Jinhua in 2009, which is also the main source of news reported by the Hong Kong media. But the possibility of large-scale use is unlikely ", because after the 2009 Jinhua milk powder incident, hydrolyzed protein has become a substance that is explicitly prohibited from being added in dairy products, and is also a required item. The reason why the addition of hydrolyzed protein is prohibited is because the existing detection method can only detect whether the hydrolyzed protein is added to the dairy product, but it is impossible to detect whether the hydrolyzed protein contains "carcinogenic substances" called by the media. The heavy metal test determines whether to add substandard hydrolyzed protein.

"But it can't be completely ruled out that there are still dairy companies illegally using hydrolyzed protein," Wang Dingmian said. For example, it is used in the feed industry, or some illegal companies use illegally to ensure that the protein content meets the standards.

Wang Dingmian also believes that when the protein content is up to standard, the addition of hydrolyzed protein is actually not necessary, let alone increasing the cost, it will also change the quality of the product.

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