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Ascorbyl palmitate is an ester formed from ascorbic acid and palmitic acid creating a fat-soluble form of vitamin C. In addition to its use as a source of vitamin C , it is also used as an antioxidant food additive ( E number E304).
These applications use sodium palmitate, which is commonly obtained by saponification of palm oil. To this end, palm oil, rendered from palm trees (species Elaeis guineensis ), is treated with sodium hydroxide (in the form of caustic soda or lye), which causes hydrolysis of the ester groups, yielding glycerol and sodium palmitate.
Most animals and plants are able to synthesize vitamin C through a sequence of enzyme-driven steps, which convert monosaccharides to vitamin C. Yeasts do not make l-ascorbic acid but rather its stereoisomer, erythorbic acid. [63] In plants, synthesis is accomplished through the conversion of mannose or galactose to ascorbic acid.
These compounds are water-soluble and, thus, cannot protect fats from oxidation: For this purpose, the fat-soluble esters of ascorbic acid with long-chain fatty acids (ascorbyl palmitate or ascorbyl stearate) can be used as antioxidant food additives. Sodium-dependent active transport process enables absorption of Ascorbic acid from the intestine.
Mineral ascorbates are used as dietary supplements and food additives, and drugs.An example of a mineral ascorbate drug is sodium ascorbate injections (the acid form, ascorbic acid, of vitamin c is too acidic for injections).
Retinyl palmitate, or vitamin A palmitate, is the ester of retinol and palmitic acid, with formula C 36 H 60 O 2. It is the most abundant form of vitamin A storage in animals. [2] An alternate spelling, retinol palmitate, which violates the -yl organic chemical naming convention for esters, is also frequently seen. [citation needed]
Other acyl groups such as stearate (C18:0) or oleate (C18:1) are also frequently accepted, more so in plant and viral proteins, making S-acylation a more useful name. [8] [9] Several structures of the DHHC domain have been determined using X-ray crystallography. It contains a linearly-arranged catalytic triad of Asp153, His154, and Cys156.
The Arecaceae (/ ˌ ær ə ˈ k eɪ s i. iː,-ˌ aɪ /) is a family of perennial, flowering plants in the monocot order Arecales.Their growth form can be climbers, shrubs, tree-like and stemless plants, all commonly known as palms.
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