Among vegetables, pepper, chrysanthemum, bitter gourd, beans, spinach, potatoes, leeks and so on are rich in content; Among fruits, Zizyphus jujuba, fresh jujube, strawberry, citrus and lemon are the most abundant. There is also a small amount of vitamin C in the internal organs of animals.
food source
Vitamin C in food mainly exists in fresh vegetables and fruits, which cannot be synthesized by human body. Fruits such as jujube, jujube, orange, hawthorn, lemon, kiwi fruit, seabuckthorn and Rosa roxburghii are rich in vitamin C. The contents of green leafy vegetables, green peppers, tomatoes and Chinese cabbage are high. ?
Extended data:
physicochemical property
Appearance: colorless crystal
Boiling point: none
Melting point:190 ~192℃
Acidity: The alkylene glycol group in the molecular structure of vitamin C, especially the OH at C3 position, is strongly acidic due to the yoke effect (pK
=4. 17)； C2 OH is very weak in acidity due to the formation of intramolecular hydrogen bonds (pK
= 1 1.75）。 Therefore, vitamin C generally behaves as a monobasic acid, which can react with sodium bicarbonate to form sodium salt.
Maximum ultraviolet absorption: 245nm
Fluorescence spectrum:
Excitation wavelength: none
Fluorescence wavelength: None
English name: Vitamin C?
CASNo.: 50-8 1-7
EINECSno.: 200-066-2
InChI code: inchi =1/c6h8o6/C7-1-2 ⑻ 5-3 ⑼ 4 ⑽ 6 ⑾12-5/h2,5,7-10h.
Molecular weight: 176. 13
IUPAC name: 2,3,5,6- tetrahydroxy -2- hexenoic acid -4- lactone.
It is relatively stable in dry air, impure and many natural products can be oxidized by air and light, and its aqueous solution is unstable, and it will be oxidized into dehydroascorbic acid quickly, especially in neutral or alkaline solution. Metal ions such as light, heat, iron and copper will accelerate oxidation. Can form stable metal salts. It is a relatively strong reducing agent, which turns dark and light yellow in different degrees after storage. LC50: 518mg/kg (mice, vein).
It is easy to deteriorate when exposed to air and heating, and it is easy to oxidize and fail in alkaline solution. Under the condition of air. It deteriorates rapidly in aqueous solution and is a strong reducing agent.
Widely distributed in animals and plants. Stable to air when dry. The aqueous solution is rapidly oxidized by air. ?
Reference: Vitamin c_ Baidu Encyclopedia