Vitamin C for humans is an essential vitamin. We can obtain the required VC by a normal diet. Marketed VC vast majority of products are synthetic, not natural products.
Ever since the children from time to time in recent years and domestic students to talk to the child's diet and nutritional things. In the United States, newborn baby's diet is not so much about either breast milk or formula-fed. A routine check every month, as long as the indicators qualified doctor will be very happy to say, very good very good, so keep on the line. You have to ask the doctor the child's diet have any suggestions, doctors generally would say that if you eat milk formula, it does not need to supplement if breast-fed, then, for insurance purposes, every day you can add a little vitamin A, C and D composite syrup. The syrup, general supermarkets and pharmacies can buy, a few dollars a bottle, enough for a child to eat two months.
Although most domestic students feel that there is no domestic attention, but that makes sense. Also asked me to buy some vitamins to return, there is also an adult child to eat food. I'm not understand why out of the country to buy vitamins, the students asked another question, made me surprised endless: "This is a natural vitamin it?" This is what the age, vitamins are relatively small molecules, synthesis is now the main mode of production, how could there be so many natural vitamins do?
The US market there are many brands and varieties for different age groups in different gender multivitamin, but almost no natural advertised. Chinese search site and found a home, but quite another way. Vitamin C (hereinafter referred to as VC), for example, in Taobao search to a different brand of VC products are advertised almost all natural. Interestingly, some products have been purchasing from the United States, without any reference to the word natural, still as a natural product promotion on the original packaging, transformed into high-priced "American-natural" VC. There are a number of businesses in the product manual or online publicity hype "natural VC" good, such as "natural and synthetic VC structure is not the same," "natural structure more suitable for the body to absorb," "fruit of the VC unstable, do not eat fruit VC tablets effect, "and so forth. I also used to do research VC, some understanding of the nature of it, I feel it is necessary to introduce the knowledge about the VC. The following section involves some basic knowledge of organic chemistry, can be skipped if you do not understand.
VC formula is C6H8O6, molecular weight 176.12. In biology, this is a relatively simple small molecules. Structure as shown below:
Organic Chemistry learned friend can certainly see the glucose molecules and have a certain similarity. Glucose formula is C6H12O6, molecular weight 180.16, the structure as shown below:
In fact, in vivo, VC is from glucose through a four-step enzymatic synthesis of. VC has a strong reduction, strong reduction of the mean is that it can provide electronic participation important biochemical reactions to other important molecules as electron donors, the most important use is VC participates in the synthesis of collagen. VC as an electron donor, keeping hydroxylation of proline or lysine through the action of enzymes, hydroxylation of proline or lysine can maintain the molecular structure of collagen, which can protect the blood vessels and cartilage. In the absence of VC, the collagen becomes fragile, can cause scurvy, so the VC is also known as ascorbic acid.
Interestingly, individual birds, mammals and some higher primates, including humans, encoding the last catalytic enzyme genes are mutated, lost the ability to synthesize the VC. This mutation is not fatal, because we need the VC intake from food. However, VC is not long-term storage in the human body, we must continue to VC intake from food to maintain health. A long period of time, humanity voyages scurvy is higher than the threat of storms and COSCO pirates, because at that time the seafarer's diet mainly of meat and pasta, and few in the VC content contained.
But also because of its reductive, VC is being promoted as a good antioxidant, can remove harmful oxygen free radicals, and thus it has been regarded as anti-aging effects. However, these effects have not been confirmed by rigorous scientific experiments.
We have already mentioned, the body can not synthesize VC, VC maintain health needs to be entirely dependent on the food supply. Fortunately, the daily diet can provide us with a wealth of VC, such as common fruits include oranges, strawberries, apples, cherries, tomatoes and other common vegetables in carrots, broccoli, lettuce, cucumber, eggplant, some animal liver, heart, and milk and so on. Therefore, the normal diet of VC fully able to meet human needs, human beings can not survive.
As a pure VC API, early mainly it extracted from the fruit, which is called "natural VC." But the extraction of natural VC is extremely uneconomical. VC containing relatively high and relatively common oranges, for example, per 100 grams contains only 50 mg of VC. That is, even if the extraction efficiency (in fact this is not possible) one hundred percent, to extract one gram VC requires two kilograms of oranges. Purification of natural vitamin C necessarily expensive. This is not to consider the extraction process of consumption and other costs, and therefore the synthesis of vitamin C in comparison, which is of no commercial value.
In fact, the use of glucose fermentation synthesis VC or semi-fermented semi-chemical synthesis method is the most mature of various vitamins, and there have been newer and better methods emerge, its efficiency is also rising. It is important to point out that the synthesis of structure and function in VC and VC fruit extract is exactly the same. Currently in the country to buy pure VC, per kilogram needs only 40 yuan or less. Even without considering the dietary intake of VC, according to the World Health Organization recommends 45 milligrams daily basis, one kilogram enough for one person for 60 years. In fact, VC as the amount of nutrients needed is very small. Because of its low price, safety features, a large number of VC is to be used as food additives and preservatives. China is the largest producer of VC, VC domestic product in 2004 has accounted for 85 percent of the US market (http://info.pharm.hc360.com/zt/flongduan/index.shtml). In recent years, the biggest problem faced by domestic producers VC is overcapacity (http://stock.sohu.com/20130802/n383197720.shtml). There are even reports that China's VC production capacity even more than global demand.
Worldwide, there is a misconception in people is more common, so-called "natural is safe." This kind of thinking can easily be bad business - in fact, many such businesses - utilized, became an excuse for profit and others means. But also because of the lack of effective supervision in the field of food hygiene, this scam bigger and bigger, plus "Gresham's Law" Effects, resulting in the entire health care market does not lie to sell the product to the point.
The following are some of the errors and the truth about the VC:
1. VC has a more natural fit absorbed by the body structure.
wrong! As described above natural and synthetic VC VC having the same structure and properties.
2.VC is unstable.
wrong! VC dried crystals can be stored long-term stability at room temperature. The author of VC laboratory a decade ago to buy, still has a strong activity. VC only in a neutral or alkaline aqueous solution, it is easily oxidized.
3. The daily vegetables in the VC during cooking is oxidized destroyed, there is no effect.
wrong! Even VC oxidized in the human body can also be reduced and glutathione into active form.
4. Natural VC no side effects, synthetic because of low prices, high doses, prone to stones.
One study showed that daily intake of very high doses (1000 mg) in the case of VC supplements, the incidence of kidney stones rises from 1.8% to 3.4%. And more than 1,000 milligrams recommended by WHO is 45 mg to 20 times. Eat less will not do it!
5. The current VC products on the market a lot of natural, synthetic and composite three. It refers to a compound in which the so-called natural parts of the part is synthetic.
Definition of different types of complex vitamin is vitamin necessarily follow a certain proportion of the mixture.
6.VC how to promote iron absorption?
indeed! Iron deficiency is the main cause of anemia. Iron supplements are commonly used ferrous sulfate solution or capsules, ferrous ions readily absorbed by the body. But the ferrous ion is extremely unstable under neutral conditions is easily oxidized into insoluble in water can not easily be absorbed by the ferric ions. VC strong reduction can quickly restore the ferric ion into divalent ferrous ion, help the body absorb. I did the experiments, ferric ions at 0.5 mmol / l concentration of VC solution can be instantly transformed into ferrous ions. But this mostly occurs in gastritis and anemia in patients with gastrointestinal surgery inadequate intake of iron and certain special types of ordinary people do not need additional supplements to prevent anemia VC.
7. Where imports than domestic VC VC good?
The only advantage is that price and high -------- good!
(Author: Review: lw56102 Shackles Prisoner)
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