Vitamin A palmitate
classification：
vitamin
[Product name]: Vitamin A palmitate [Chemical name]: (S) - 2 - [(R) - 3,4-dihydroxy-5-oxy-2,5-dihydro-2-furanyl] - 2-hydroxyethyl hexadecyl ester [alias]: ascorbic acid palmitate [Molecular formula]: C22H38O7 [Physical and chemical properties]: This product is light yellow or almost white powder, almost insoluble in water, soluble in ethanol and methanol, almost insoluble in dichloromethane and fatty oil. [Main quality index] Appearance: pale yellow or almost white powder solution with clear appearance, ≤ BY4pH6.5-7.5 specific rotation+21o+24o melting point 107-117 ℃ content 98.0-100.5% organic volatile impurities meet the requirements [Physical and chemical index]: appearance: no caking, no visible impurities. Color: It has the inherent color of the product and is uniform. Odor: the inherent smell of the product. Total bacterial count: ＜ 1000 Salmonella: no Escherichia coli: no
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palmitate
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Vitamin A palmitate
[Product name]: Vitamin A palmitate
[Chemical name]: (S) - 2 - [(R) - 3,4-dihydroxy-5-oxy-2,5-dihydro-2-furyl] - 2-hydroxyethyl hexadecyl ester
[alias]: Ascorbyl palmitate
[Molecular formula]: C22H38O7
[Physical and chemical properties]: This product is light yellow or almost white powder, almost insoluble in water, easily soluble in ethanol and methanol, almost insoluble in dichloromethane and fatty oil.
[Main quality indicators]
Appearance: light yellow or almost white powder
Clear solution appearance, ≤ BY4
pH 6.5-7.5
Specific rotation+21o -+24o
Melting point 107-117 ℃
Content: 98.0-100.5%
Organic volatile impurities meet the requirements
[Physical and chemical indicators]:
Appearance: no caking, no visible impurities.
Color: It has the inherent color of the product and is uniform.
Odor: the inherent smell of the product.
Total bacterial count: ＜ 1000
Salmonella: None
Escherichia coli: none
[Chemical name]: (S) - 2 - [(R) - 3,4-dihydroxy-5-oxy-2,5-dihydro-2-furyl] - 2-hydroxyethyl hexadecyl ester
[alias]: Ascorbyl palmitate
[Molecular formula]: C22H38O7
[Physical and chemical properties]: This product is light yellow or almost white powder, almost insoluble in water, easily soluble in ethanol and methanol, almost insoluble in dichloromethane and fatty oil.
[Main quality indicators]
Appearance: light yellow or almost white powder
Clear solution appearance, ≤ BY4
pH 6.5-7.5
Specific rotation+21o -+24o
Melting point 107-117 ℃
Content: 98.0-100.5%
Organic volatile impurities meet the requirements
[Physical and chemical indicators]:
Appearance: no caking, no visible impurities.
Color: It has the inherent color of the product and is uniform.
Odor: the inherent smell of the product.
Total bacterial count: ＜ 1000
Salmonella: None
Escherichia coli: none
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α- Lipoic acid is light yellow powder crystal, almost tasteless. The solubility in water is small, about 1 g/L (20 ° C). It is soluble in 10% NaOH solution and aliphatic solvent. It is soluble in methanol, ethanol, chloroform and ether.
Lipoic acid α- Lipoic acid.
Since lipoic acid has a chiral center, it has two configurations: R and S.
Natural lipoic acid is a white crystal with only R configuration, and only R configuration lipoic acid can be covalently conjugated to lysine residues through amide bonds to play the role of coenzyme.
However, the synthetic lipoic acid is a mixture of equal proportion of R and S configurations, which is a light yellow powdery substance, and is extremely soluble in lipid solvents.
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