Gold nanoparticles (AuNPs) coated with ester-headed or ether-headed PEG ligands were synthesized. Ester-headed AuNPs, but not ether-headed, were transferred from the organic phase (CH2Cl2) to the alkali aqueous phase, indicating that the hydrolysis of the ester moiety triggered the phase transfer of the AuNPs. We found that AuNPs with ester-headed ligands (ester-AuNPs) were internalized into He...

We report on the synthesis of a series poly(ester-anhydride) composed following dicarboxylic acids: adipic, suberic, sebacic, dodecanedioic acids; and hydroxyalkanoic ricinoleic 12-hydroxystearic acid with control molecular weight approaching from new method in which well-defined ester monomers are first synthesized by stepwise addition acids molecules into melted acids. The key advantage this ...

Energy is vital to the profitable growth of every nation and stimulate new research. Only natural resources can meet growing energy demand in recent years, biodiesel has become very interested as well environmental advantages that it be combined with mineral diesel fuel any quantity. The research focuses on study replacement a safflower methyl ester. engine tests shall performed using ester DI ...

background: lipase is an enzyme with immense application potential. ester synthesis by lipase catalysis in organic media is an area of key industrial relevance. enzymatic preparations with traits that cater to the needs of this function are hence being intensely researched. objective: the objectives of the study were to immobilize the lipase from bacillus sp. ps35 by cross-linking and adsorptio...

A series of polycaprolactones (PCLs) with molecular weights 950–10,100 g mol?1 and Ð 1.10–1.87 have been synthesized via one-pot, solvent-free ring-opening polymerization (ROP) ?-caprolactone (CL) using a heterogeneous double metal cyanide (DMC) catalyst. Various initiators, such as polypropylene glycol, ethylene propylene glycerol, sorbitol, are employed to tune the number hydroxyl end groups ...

The liver is capable of storing large quantities of vitamin A in ester form (1). However, some uncertainty still exists concerning both the composition of liver vit,amin A ester and the ability of the liver to esterify vitamin A. Vitamin A palmitate was isolated from fish liver many years ago (a), and recently it has been suggested that this ester is the principal if not exclusive (3, 4) ester ...

Thermoplastic elastomers based on polyesters/carbonates have the potential to maximize recyclability, degradability and renewable resource use. However, they often underperform suffer from familiar trade-off between strength extensibility. Herein, we report well-defined reprocessable poly(ester-b-carbonate-b-ester) with impressive tensile strengths (60 MPa), elasticity (>800 %) recovery (95 %)....

In the simple suspension method, intended medicine is suspended in hot water when administered to a patient by tube. Suspension of laxative, magnesium oxide reported hydrolyze ester-type drugs. Because several angiotensin converting enzyme (ACE) inhibitors have ester bonds their structure, may cause incompatibility with an ACE inhibitor. The purpose this study was clarify effect on stability ei...

The concentration dependence and tissue distribution of high density lipoprotein (HDL) cholesteryl ester and apolipoprotein (apo) transport were determined in apoA-I knockout mice (apoA-I-/-) that lack normal HDL in plasma. Rates of HDL cholesteryl ester clearance were highly sensitive to plasma HDL cholesteryl ester concentrations with clearance rates falling by 80% in the liver and by 95% in ...