Vitamin A Vetamin A

Structural formula

• Numbering system
• Physical property data
• Toxicological data
• Ecological data
• Molecular structure data
• Computing chemical data
• More
  • Properties and Stability
  • Storage method
  • Synthesis method
  • Purpose

Numbering system

CAS number:68-26-8

MDL number:MFCD00001552

EINECS number:200-683-7

RTECS number:VH6750000

BRN number:403040

PubChem number:24899395

Physical property data

1. Character: faded flake crystal.

2. Density (g/mL, 20/4℃): 0.954

3. Relative vapor density (g/ mL, air=1): Uncertain

4. Melting point (ºC): 63.5

5. Boiling point (ºC, normal pressure): 137, (0.00013pa)

6. Boiling point (ºC, 0.667Pa): 120-125

7. Refractive index: 1.641

8. Flash point (ºC): -26

9. Specific rotation (º): Uncertain

10. Autoignition point or ignition temperature (ºC): Uncertain

11. Vapor pressure (kPa, 25ºC): Uncertain

12. Saturated vapor pressure (kPa, 60ºC): Uncertain

13. Heat of combustion (KJ/mol): Uncertain

14. Critical temperature (ºC): Uncertain

15. Critical pressure (KPa): Uncertain

16. Log value of oil-water (octanol/water) partition coefficient: Uncertain

17. Explosion upper limit (%, V/V): Uncertain

18. Explosion lower limit (%, V/V): Uncertain

19. Solubility: Soluble in absolute ethanol, methanol, chloroform, ether, fats and oils, almost insoluble in water or glycerol.

Toxicological data

None

Ecological data

None

Molecular structure data

1. Molar refractive index: 95.49

2. Molar volume (cm³/mol): 300.0

3. ��� Zhang specific volume (90.2K): 738.0

4. Surface tension (dyne/cm): 36.6

5. Polarizability (10-24cm3): 37.85

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): None

2. Number of hydrogen bond donors: 1

3. Number of hydrogen bond acceptors: 1

4. Number of rotatable chemical bonds: 5

5. Number of tautomers: none

6. Topological molecule polar surface area 20.2

7. Number of heavy atoms: 21

8. Surface charge: 0

9. Complexity: 496

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters: 4

14. Number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

1. Exist in tobacco leaves.

Storage method

This product should be sealed and stored in a cool, dry place away from light.

Synthesis method

1. Natural vitamin A is extracted from cod liver oil. Among them, retinol (vitamin A1) is extracted from the liver of marine fish, and 3-dehydroretinol (vitamin A2) is extracted from the liver of freshwater fish.

2. There are many artificial synthesis routes for retinol and its derivatives. The most common one is the Isler route, which is C13-C14-C20.

3.Firstly, βionone and ethyl monochloroacetate are condensed, and then hydrolyzed and decarboxylated to obtain tetradecanaldehyde; in addition, acetylene is obtained Sodium is condensed with methylketene, and the resulting material reacts with ethylmagnesium bromide to obtain magnesium bromide. Condensation, hydrolysis, and catalytic hydrogenation of magnesium dibromide with tetradecane aldehyde produce hydroxyvitamin A, react with acetyl chloride to obtain hydroxyvitamin acetate, and then brominate and debrominate to obtain vitamin acetate.

Purpose

1. It can maintain vision and promote bone growth, maintain the integrity and soundness of the epithelial structure, prevent night blindness, improve vision, maintain strong teeth, promote bone growth, promote the growth of children, keep the skin moist, ensure normal hair growth, and enhance immunity. force.

2.Vitamin A is a component of the photosensitive substances in visual cells. Lysine is an essential amino acid for the human body and can maintain the integrity of the epithelial tissue structure. and health, promoting the growth and development of the body. When lacking, growth and development will be hindered and reproductive function will decline. It is often used to prevent and treat children’s stunting, dry eye syndrome, night blindness, dry skin, and reduced resistance to infection in the eyes, respiratory tract, urinary system, and intestines. Our country stipulates that it can be used in salad oil, sesame oil and margarine, and the usage amount is 4.0~8.0mg/kg; the maximum usage amount in solid beverages is 4~8 mg/kg; the usage amount in baby food and dairy products is 3.0~9.0mg/kg ; The maximum usage amount in ice cream is 0.6~1.2mg/kg; The maximum usage amount in milk drinks is 0.61.0mg/kg. When β-carotene is used to fortify β-carotene beverages, the maximum usage amount is 20 to 40 mg/kg; in solid beverages, the maximum usage amount is 3～5mg/kg.

3.Vitamin A is a component of the photosensitive substances in visual cells, which can ensure the integrity and health of the epithelial tissue structure and promote the body’s development and growth. When lacking, growth and development will be hindered and reproductive function will decline. Retinyl acetate is generally added to feed.

4.Nutritional supplements. It is used as a nutrient additive in cosmetics to prevent rough skin and promote normal growth and development. It can be used in creams and lotions.