What is pesticide:
Pesticides can be used to kill insects, fungi and other organisms harmful to crop growth. The earliest pesticides used are DDT, BHC and so on, which can wipe out numerous pests. But their stability is good, they can exist in the environment for a long time and accumulate continuously in animals, plants and the human body. Pesticide control services should be paid more attention. Later, organophosphorus pesticides, such as dichlorvos, were used instead of the original pesticides. Because they are too toxic, they do great harm to people and animals.
In recent years, a batch of high-efficiency and low-toxicity pesticides have emerged with specificity, namely hormone pesticides. Pesticides have both advantages and disadvantages, which are good for plants. However, when pesticides are widely used in the feed of dairy cows, they will have a great impact on the milk of dairy cows. Because there are many kinds of feed for dairy cows, such as corn, legume residue, pasture and so on, many kinds of pesticides are used. The industrial chain of milk and its dairy products is long. Milk will be polluted in the process of production, transportation, and processing. Any kind of pollution may affect the safety of milk, Can milk still drink?
The pesticide residues in milk mainly come from :
1. In the feeding process of dairy cows mentioned above, the dairy cows have eaten pesticide-contaminated water sources or used feed containing pesticide residues, and those pesticides and milk nutrients will remain in the body of dairy cows, so the milk source may also be contaminated.
2. In order to inhibit the fungi, bacteria, flies, mosquitoes and other insects in dairy cows, the insecticides may be mixed into the milk when it is using.
3. In the production process of dairy products, pesticides used in feed cultivation are transferred and transformed into cow milk, processed into dairy products, and finally into milk and dairy products, then sell into milk markets.
What harm will pesticide residues in milk powder do to infants:
People eat milk or milk powder containing pesticide residues, although the amount of pesticide in milk powder or milk is very small, if ingested for a long time, it will accumulate in the body, once it exceeds a certain concentration, it will cause harm to human health and safety.
For example, pyrethroid pesticides can cause neuronopathy, organochlorine pesticides can cause the pathological changes of the nerve cell, damage neurons, leading to the death of nerve center, which is one of the causes of liver diseases; long-term consumption of pesticide-contaminated food is leading to cancer, arteriosclerosis, disease of the heart, fetal malformation, stillbirth, early death, and other diseases. The important cause of the disease.
Just three-million grams of pesticide residues of milk powder for babies can cause brain development disorders in children before the age of seven. The main organ of organochlorine pesticides is the nervous system with the brain as the core, which results in abnormal brain and intelligence development and manifests such diseases as retardation of reaction, mental retardation, and dull expression.
Organophosphorus pesticides prevent the transmission of nerve signals, leading to nervous system dysfunction. Toxic children show hyperactivity and difficulty in concentrating. Their IQ is generally 70-90. Their speech IQ and figure recognition are impaired and their left and right discrimination are difficult. It was found that when organochlorine pesticides were added to human cells at a concentration of three parts per millionth of body weight per kilogram, the synthesis of proteins promoting brain development almost stopped, and the brain could not develop.
Japan found that children affected by PCBs had seven fewer IQ scores than normal children; scientists at Michigan State University in the United States found that children polluted by PCBs had an average IQ of 6 points lower than normal children 11 years later.
Research by Professors Yugang and Huang Jun of Tsinghua University shows that children polluted by organochlorine pesticides in China have three manifestations: lightweight, small head and low intelligence. Their cognitive ability is worse at 7 months, their reading, writing and memory are worse at 4 years old, their IQ is lower at 11 years old, and their reading, writing, arithmetic and comprehension abilities are all comparable Poor.
Pesticide residues will endanger the growth and development of children before the age of 16. Environmental hormones (also known as exogenous endocrine-disrupting chemicals) are recognized as the main murderers of abnormal growth and development of human beings and organisms worldwide. Of the 70 environmental hormones identified by international organizations, 40 are pesticides, accounting for about 60% of the total environmental hormones.
The serious harm of pesticide residues on children's growth and development is manifested in three aspects:
First, it leads to abnormal growth of height and body shape. Generally speaking, boys begin to grow faster from about 12 weeks. 14-15 years old is the fastest growing stage of height. After 16 years old, it slows down. After 18-20 years old, it ceases to grow. Girls'growth jumps two years earlier than boys. So before the age of 16 is the best period for children to grow and develop. Human growth and development are mainly regulated by growth hormone and growth factors. Residual pesticides can cause pituitary hypoplasia and abnormal secretion of growth hormone. When hormone secretion is too low, height will grow slowly, the body will become thin and small. When hormone secretion is too much, gigantism will occur.
Taiwan found that children affected by organochlorine pesticides weighed 500 grams less at birth and were 3.1cm shorter than those not polluted. A child should grow by an average of 5 centimeters a year between the ages of 3 and 9. If it is below this speed, it is a sign of dwarfing. Another danger of abnormal growth is abnormal obesity in children, which is the result of excessive secretion of growth hormone caused by residual pesticides.
The second is to cause premature puberty in children. The menarche of girls in China has been advanced from the average age of 14 20 years ago to about 10 now. Four-year-old girls have almost complete breast maturity, and five-year-old children have menstruation. This phenomenon is seen every day in children's hospitals across the country. Precocious puberty results in early growth, but more than half of them end up less than 150 centimeters tall.
Third, it causes serious diseases. Scientists have shown that preschool children may be carcinogenic when exposed to more than eight pesticides. Long-term exposure to organophosphorus pesticides damages children's visual function, showing symptoms of myopia, edema and so on. Medical research has confirmed that almost all pesticides can cause damage to children's immune systems and low resistance to disease.
How to detect pesticide residues in milk?
Common methods include chemical rapid detection, immunoassay, enzyme inhibition and in vivo detection. Now there is a new pesticide residue test paper that can quickly detect pesticide residues.