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The weather is getting hot up, preserved eggs is a common dish on the table people. However, the recent heavy metal contamination of food frequently exposed, so many consumers, some worry that it will not eat the egg excessive lead content of it, the market marked "lead-free process," the egg is really credible?
Beijing News reporter recently purchase this purpose preserved eggs from different origins, both brand boxed from supermarkets, markets, wholesale markets, but also in bulk. Market traders and supermarkets sellers have said, and now these preserved eggs are "lead-free", do not worry. The reporter also noted that many well-known brands of preserved eggs, are also specialized packaging prominently marked with the word "lead-free processes," the.
Reporters randomly selected five kinds of preserved samples, which also includes a quail egg, sent to Beijing Zhi Yun Technology Co., Ltd. (China Agricultural University College of Food Science and Nutritional Engineering Research Center for Food Safety Rapid detection of the location), with a quick way to check The lead content of egg experiment testing. The results show that these five kinds of "lead-free preserved eggs" are detected trace amounts of lead, but the contents are defined in the national standard 0.5mg / kg range, no lead exceeded.
However, food safety experts recommend that pregnant women and children are more likely to absorb lead. To reduce the risk, we recommend that pregnant women and children egg "limit consumption", eat or do not eat.
Relevant experimental videos, the public can log on the official website of the Beijing News (
5 kinds of unleaded preserved eggs are contained traces of lead
Experimental samples: from supermarkets, markets, wholesale markets to buy 5 kinds of egg, from all different origins
Experiments Location: Beijing Chi Werder consumer experience center for food safety testing
The experimental procedure: Chi Werder laboratory personnel to egg peel, cut it into pieces with scissors, preserved eggs, weighed 2.5 grams, then add 10ml of distilled water in the extraction bottle with straw stir and let stand 10 minutes, the supernatant was sucked into 1ml glass cuvette were sequentially added four kinds of reagents, then mix, this time colorimetric tube in the five kinds of egg solution shows a light coffee color.
Subsequently, the experimenter them with standard colorimetric card comparison.
Experiment Interpretation:
"If preserved in the higher lead content, the deeper the red, if not lead, the solution is completely rendered in blue," Chi Werder Technology Co. engineer Yu Yong told reporters, by contrast than the color card, you can determine the initial Lead content of these five kinds of egg in about 0.2mg / kg this range, far below the national standard 0.5mg / kg. We can say that the lead content of the egg is extremely small, and consumers do not have to worry too much.
■ Expert Weapon
High heavy metal content of more than egg spots
Associate Professor of Food Science and Nutritional Engineering, China Agricultural University, said Zhu Yi, heavy metals lead, copper and other relatively high egg, usually spots will be more, if you see there are multiple spots, the consumer should be careful.
Four strokes to distinguish the merits of egg
A weigh: the egg in the palm of light weigh, good quality egg flexible, trembling large, poor egg quality without trembling.
Two Shake: Shake your ear and hold the egg several times, listening to the sound of whether there is water, preserved eggs generally do not sound good, but the bigger the sound may have been a bad egg.
Three to see: egg shell was gray, no spots for the top grade. In the light perspective, most of the eggs are black or brown, yellow or reddish small portion of high-quality eggs. If most or all of the brown shadow transparent body and have blisters rotate back and forth, as poor quality eggs.
Four taste: pickled egg if good, large egg white elastic, was dark brown, and pine pattern, egg yolk center was orange.
■ doubts
Unleaded preserved traces of lead can call it?
Less than 0.5mg / kg may be called unleaded preserved eggs
Now that you have adopted lead-free processes, preserved in the detection of trace why would lead? Associate Professor of Food Science and Nutritional Engineering, China Agricultural University, Zhu Yi explained that the lead-free process that does not use lead compounds is in the process of egg processing, and lead-free egg does not represent the egg completely lead-free. Because the nature of our lives, the air, soil, water will contain trace amounts of lead,piumini moncler, lead-free egg is almost absolutely impossible, as long as the exclusion is not artificially added in excess of lead on the line. In fact, according to our standards, the lead content of less than 0.5mg / kg of egg, can be called "lead-free preserved eggs."
What are the hazards of lead exceeded the egg?
Long-term consumption of food can cause excessive lead children suffering with ADHD
Chi Werder consumer experience center for food safety testing engineers in Yong, lead and compounds is harmful to humans. Regular consumption of excessive amounts of lead in food, resulting in the accumulation of lead in the human body, the human body's nervous system, immune system, kidney harm, especially have a certain impact on children's cognitive and behavioral function, can cause children to suffer ADHD.
Unleaded preserved eggs can often eat it?
Can be eaten in moderation, it is recommended for pregnant women eat or not eat children
Zhu Yi said that food can be divided encourage regular consumption, eaten in moderation, limit consumption, then the "lead-free egg" as "moderate consumption" of food, for adults, eat once a week, no problem. Now preserved lead-free processes have been widely promoted, "moderate consumption" is safe, we do not have too much anxiety.
But for pregnant women and children, of lead absorption rate is higher than the general population, the general population of lead absorption rate of only 10% -15%, while pregnant women and children are 3-5 times its absorption rate can be as high as 50%.
Therefore, pregnant women and children to eat a small amount of fully qualified if preserved, no problem, but if buy raw egg is not lead-free processes, risks will be enormous. To reduce the risk, it is recommended that two populations on the egg or should "limit consumption" as well, eat or do not eat.
Excerpts written / Beijing News reporter Liao Ailing
Edition photography / Beijing News reporter Yin Yafei
(Original title: unleaded preserved eggs are eaten in moderation is OK leaded)