ester

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ester

 [es´ter]
a compound formed from an alcohol and an acid by removal of water.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

es·ter

(es'tĕr),
An organic compound containing the grouping, -X(O)-O-R (X = carbon, sulfur, phosphorus, etc.; R = radical of an alcohol), formed by the elimination of H2O between the -OH of an acid group and the -OH of an alcohol group; usually written as in ethyl acetate (from acetic acid and ethyl alcohol), CH3CO-OC2H5 or CH3COOC2H5.
Farlex Partner Medical Dictionary © Farlex 2012

es·ter

(es'tĕr)
An organic compound containing the grouping, -X(O)-O-R (X = carbon, sulfur, phosphorus; R = radical of an alcohol), formed by the elimination of H2O between the -OH of an acid group and the -OH of an alcohol group.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ester

a compound formed from an alcohol and an acid.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

es·ter

(es'tĕr)
An organic compound containing the grouping, -X(O)-O-R (X = carbon, sulfur, phosphorus; R = radical of an alcohol), formed by the elimination of H2O between the -OH of an acid group and the -OH of an alcohol group.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about ester

Q. Does anyone know an over the counter alternative to Lovaza, omega-3 acid ethyl esters? too expensive at Dr

A. there are all sort of companies that sell Omega-3, i buy from a company named Alsepa, but there are dozens of companies. but don't be tempted to buy a very cheap one, because they can be less purified.

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References in periodicals archive ?
Since cyclodextrin reacts with resveratrol to form a stable ester bond, the photostability of the conjugate is improved compared to the parent resveratrol and its inclusion complex.
No significant differences were found between the 2-12month-old group and the 13-24-month-old group in any of the superficial components of the SC (sebum with an ester bond, ratio of protein secondary structure).
Based on FTIR and GPC analysis, on one hand, the ester bond of the PC chain was prone to rupture, which led to generating three kinds of free radicals (A, B, and C as shown in Scheme 2).
9b) but the O1s spectrum presented two new contributions at 529.9 eV, assigned to O-H bonds [47], and 534.6 eV related to ester groups [41-431, confirming the formation of ester bonds at higher temperature of thermal treatment.
This result indicates that significantly enhancement of the adhesive strength on Cu-TLCP junction was achieved by the substitution from ester bond to thioester bond.
Let [R] be the concentration of the low molar mass reagent, [A] the concentration of its functional groups, [P] the concentration of the polyester macromolecules (with degree of polymerization N and number average molecular weight [bar.M.sub.n]) and [B] that of its inner ester bonds. The general kinetic expression governing the reactions, written with reference to the reacting groups, is
For example, PHMOU is much more hydrolyzable than PEAU, although both have the same ester bond concentration.
The latter generate acidic compounds at processing temperatures (4), catalyzing hydrolytic ester bonds cleavage, leading to lower molecular weights and higher amount of carboxylic end groups.
The formed carboxylic acid during the hydrolytic scission of ester bonds could further auto-catalyze the process.
The peak at 1132 [cm.sup.-1], related to C-O alcohol bonds, confirms the presence of hydroxyl groups, while the peaks at 1282, 1064 and 1020 [cm.sup.-1] are due to the C-O ester bonds. The peak attributed to carbonyl stretching (C=O) is found at 1721 [cm.sup.-1].
It also has a similar structure to some other organic weak bases that have been used to catalyze the type of chemical reaction needed to form these gels--the formation of ester bonds to create a polyester.
HMW star polymers are designed to be slowly degradable in the environment of living organisms due to the hydrolytic instability of the ester bonds in the bis-MPA dendrimer core.