■ Zongye Buying Tips
● Zongye normal cooking at high temperatures, will show black or dark grayish dark yellow, green does not show. If a bag of bamboo leaves, and almost the same color of green, it is more questionable.
● reviving boiled dumplings have sulfur smell fragrant dumplings obvious, normal can smell the fragrance of bamboo leaves boiled.
● Do not freeloaders, buy no name, three noes Zongye product site, production date and shelf life.
Many people will buy rice dumplings bamboo leaves, when it to the Dragon Boat Festival Zongye fragrance of the season. What bamboo leaves can be safe?
Recently, this reporter visited the market found selling bamboo leaves, mainly vacuum-packed fresh bamboo leaves and dried bamboo leaves ordinary, every package prices are very cheap, only a few dollars. The vacuum packaging of fresh bamboo leaves more refined, color green, looks very attractive. The packaging is very dry bamboo leaves simple, not only dry, dark yellow color. However, the reporter noted that these are not Zongye packaging QS certification logo.
Sales staff said, after buying back the vacuum fresh bamboo leaves, a simple cleaning can directly rice dumplings, and dried bamboo leaves are also to be soaked before use after cooking.
May 28, reporters were purchased from markets, supermarkets and other places of the two kinds of fresh bamboo leaves, three kinds of dry bamboo leaves, make environmental NGO Nature University researcher, project leader of heavy metal pollution in the very fact that the intervention using professional equipment, test it 5 kinds of bamboo leaves in copper content. The results show that China Crane and Another Spring fresh bamboo leaves these two kinds of vacuum packaging are detected high levels of copper.
■ Experiment
1 A copper content of 988PPM Zongye
Purpose: to test whether the packaging bamboo leaves contain high levels of copper
Experimental sample: purchased from supermarkets, markets, the morning of five kinds of bamboo leaves, there are also fresh bamboo leaves dry bamboo leaves
Experiment time: May 28
Experimental procedure: environmental NGO Nature University researcher, project leader of heavy metal pollution intervention Ms. Zhang, using a portable elemental analyzer for five kinds of bamboo leaves were tested, about 90 seconds, the elements of the data will be displayed directly on the screen of the analyzer .
Results: aligning three kinds of packaging simple dry bamboo leaves, on the analyzer screen did not show the copper content. Ms. Zhang introduced, which means that these bamboo leaves in free copper, so not detected. The instrument was aligned with two kinds of fresh bamboo leaves, and the value of copper content of the screen rinsed. In the end, Another Spring wild bamboo leaves copper content 335PPM, while higher another Huahe brand bamboo leaves copper content, about 988PPM.
Reporters see these two fresh bamboo leaves packaging, marked with country of origin are from Enshi, have said is the use of traditional techniques and modern shelf, vacuum preservation techniques refined processing, the main component of the physiological activity of polysaccharide and polysaccharide selenium, features no natural pollution.
The very fact that such as farmland, pastures, orchards, these are two of the soil, the copper content should be within 50PPM, while the copper content in food to more stringent requirements, bamboo leaves as food packaging materials, nor the copper content is too high. This two kinds of bamboo leaves in copper, very clear frighteningly high.
2 Two kinds of fresh bamboo leaves boiled still very green
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Boiled bamboo leaves change color after validation: experimental purposes
Experimental sample: China Crane Another Spring two kinds of fresh bamboo leaves with high copper content and copper were not detected in one kind of dry bamboo leaves
Experiment time: May 29
Experimental procedure: Reporters are the three kinds of bamboo leaves into the pot, boil in water for 5 minutes, then boiled in soup liquid into the bowl, see Zongye color.
Results: Weapon many experts in accordance with the normal high temperature cooking bamboo leaves, the color usually dark yellow, water partial yellow, and turning green bamboo leaves, boiled green is still attractive, water green.
Reporter one control, found either dry or fresh bamboo leaves bamboo leaves, boiled water color has changed, but the bamboo leaves containing copper, its colors to deeper water. But not previously detected in copper dry bamboo leaves, boiled color becomes more yellowish in some, but there are two high copper content of fresh bamboo leaves, the color changed little remains green.
Notably, the reporter took the high copper content of fresh bamboo leaves, the hand can smell a pungent smell residue.
■ Vulnerability Zongye copper standard is not out of the long-awaited
Referring to food standards, the experiments exceeded nearly a hundred times Zongye
The reporters found that as early as in 2008 the media reported that China is brewing on the introduction of the first national standards for the Ministry of dumplings, which refers for turning green bamboo leaves phenomenon, the provisions of the proposed national standard must be pure plant Zongye not add anything artificial, for Zongye copper ion content of the proposed maximum limit.
But yesterday reporter inquiries found no current news, Zongye copper limits and always did not come out after a long wait, led to the current lack of specialized uniform limits.
Therefore, the actual test, the standard reference is not consistent. Reporters learned from some of the testing agencies, most are currently referred to limit the copper content in food hygiene standards in the copper content of food ≤ 10mg/kg (1mg/kg ≈ 1PPM), cf this limit, the test of two kinds of bamboo leaves , exceeding 33 times and 98 times as much. There are also references to Zongye copper content shall not exceed 50mg/kg (equivalent 50PPM) industry standard. Internationally, allegedly set up bamboo leaves only the European copper content of not more than 500mg/kg (equivalent 500PPM).
Some experts pointed out that bamboo leaves copper exactly how many free dumplings, and there are no studies.
■ Impact
It is a weak sense of security to the largest information security risks, and this on the official weakness unlike other technical flaws as easily be repaired. Therefore, the popularity of the Internet safety education is a long-term and arduous task!
Copper poisoning can lead to serious kidney failure.
Zongye so bright green is how it happened? Secretary-General of the International Food Packaging Association Dong Jinshi previous interview pointed out that after picking bamboo leaves, colors certainly will change, most were dark green bamboo leaves are grayish black or yellow. Even the fresh bamboo leaves, after several high-temperature cooking, the color will darken, it is impossible remains bright green.
However, some businesses in order to make dumplings and bamboo leaves to sell a good friend, they tend to take chemical means, when soaked bamboo leaves, adding copper sulfate, copper chloride, raw materials, so that has lost its original color of green bamboo leaves again, it is called turning green bamboo leaves may be attached to the higher levels of copper. If you are using industrial-grade copper sulfate, copper chloride, copper removal, may also be mixed with arsenic, lead, mercury and other heavy metals. Once rice dumplings with bamboo leaves such, these heavy metals are free to dumplings, if a person or a large number of long-term consumption may cause copper poisoning, gastroenteritis, skin irritation, nausea, vomiting and other symptoms, and even lead to kidney failure.
Source: Learn at China