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An ester of carboxylic acid. R stands for any group (organic or inorganic) and R′ stands for organyl group. In chemistry, an ester is a compound derived from an acid (organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group (−OH) of that acid is replaced by an organyl group (−R).
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). It is approved for use as a food additive in the EU, [1] the U.S., [2] Canada, [3] Australia, and New Zealand. [4]
one A-B-C sequence-letter, [10] A subscript or plain script number following the designated eicosanoid's trivial name indicates the number of its double bonds. Examples are: The EPA-derived prostanoids have three double bonds (e.g. PGG 3 or PGG3) while leukotrienes derived from EPA have five double bonds (e.g. LTB 5 or LTB5).
Diethyl malonate, also known as DEM, is the diethyl ester of malonic acid. It occurs naturally in grapes and strawberries as a colourless liquid with an apple-like odour, and is used in perfumes. It is also used to synthesize other compounds such as barbiturates, artificial flavourings, vitamin B 1, and vitamin B 6.
Transesterification is the process of exchanging the organic functional group R″ of an ester with the organic group R' of an alcohol. These reactions are often catalyzed by the addition of an acid or base catalyst. [1] Strong acids catalyze the reaction by donating a proton to the carbonyl group, thus making it a more potent electrophile.
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[14] [15] [6] Their selectivity for grasses arises because they target the plastid isoform of the enzyme present only in these species, making them ineffective on broad-leaved weeds and other organisms including mammals. [16] When applied as an ester, metabolism in the target plant leads to the parent acid which is responsible for the ...
Neuropathy target esterase is an enzyme with phospholipase B activity: it sequentially hydrolyses both fatty acids from the major membrane lipid phosphatidylcholine, generating water-soluble glycerophosphocholine. [9] [10] In eukaryotic cells, NTE is anchored to the cytoplasmic face of the endoplasmic reticulum membrane.
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