The air/biopolymer partition coefficient (K) and percentage of retention (R%) of ethyl butyrate (400 ppm) added to gellan gels were determined, using static headspace gas chromatography. Potassium chloride (40–120 mM) was used to induce gellan gelation. When 5 g of sample were left to equilibra...

The combined effect of the substrates on the ethyl butyrate (EB) synthesis (pineapple flavour) by a recombinant lipase from Rhizopus oryzae (rROL) immobilized in Octadecyl-Sepabeads has been studied. The initial concentration of butyric acid (BA) and the molar ratio butyric acid:ethanol (BA:ET) ...

The hydrogenation of ethyl butyrate, n-butyric acid, and n-butyraldehyde to their corresponding alcohol(s) has been studied over a γ-Al2O3-supported cobalt catalyst using a high-pressure fixed-bed reactor in the temperature range of 473–493 K. H2–D2–H2 switching experiments show that ethyl b...

The effect of gellan gels with different texture on the retention of ethyl butyrate was investigated by Static Headspace Gas Chromatography. Calcium induced gels enriched with 400 ppm of the volatile showed not significantly different aroma release for calcium concentrations up to 40 mM, whereas...

Response surface methodology was used to model and optimise the production of ethyl butyrate, catalysed by Rhizopus oryzae lipase immobilised in a hydrophilic polyurethane foam. Experiments were carried out following a central composite rotatable design, as a function of reaction temperature (T:...

The enzyme catalyzed esterification of butyric acid by ethanol under anhydrous conditions in n-hexane, through continuous removal of the formed water, follows a ping pong bi-bi reaction mechanism; immobilized lipase-B from Candida antarctica on acrylic resin (Novozyme 435) was used as biocatalys...

The effect of sucrose, glucose and fructose on the retention of ethyl butyrate by low acyl gellan gels was investigated by static headspace gas chromatography. The air/biopolymer partition coefficient (K) and percentage of retention (R%) were determined. When 5 g of sample were left to equilibra...

Temperature dependent rate coefficients for the reaction of ethyl butyrate with Cl atom were measured using relative rate (RR) technique. Gas chromatography with Flame Ionization Detector (GC-FID) was used to follow the concentrations of the reactants during experiments. The rate coefficients we...

The ubiquitous presence of the plasticizer di (2-ethylhexyl) phthalate (DEHP) in the environment is of concern due to negative biological effects associated with it and its metabolites. In particular, the metabolite mono (2-ethylhexyl) phthalate (MEHP) is a potential endocrine disruptor. Earlier...

Towards the synthesis of sterically hindered optically active secondary alcohol 2, yeast strains (Candida floricola IAM 13115 and Trichosporon cutaneum IAM 12206) with si-face hydride attack on isopropyl phenylsulfonylmethyl ketone 1 were developed by screening. Strains with complementary re-fac...

The objectives of this study were to develop an ammonolysis-based microencapsulation technique using a nonhalogenated isopropyl formate and to evaluate its feasibility in preparing poly-d,l-lactide-co-glycolide microspheres. The choice of isopropyl formate was based on its great reactivity towar...

Productivity [conversion (c) and specific reaction rate (rbatch or rflow)] and enantiomer selectivity [enantiomeric ratio (E) and enantiomeric excess (ee) of the products] of ethyl and isopropyl esters of acetic, 2-methoxyacetic and 2-ethoxyacetic acids as acylating agents were compared in the N...

Apparent molar volumes, V∅ of amino acids i.e. glycine, l-alanine, l-serine, l-threonine and DL-α-aminobutyric acid in pure water and in aqueous solutions of imidazolium based ionic liquid, 1-butyl-3-methylimidazolium bromide, [BMIm][Br] were determined from precise density measurements at temp...

This work reports the use of new support for immobilization of lipase Burkholderia cepacia (BCL) matrix made up of polylactic acid (PLA), chitosan (CH), and polyvinyl alcohol (PVA). Initially lipase from various microbial sources and immobilization support composition was screened to obtain a ro...

A systematic investigation and optimization on the conditions for the biphasic enzymatic production of isoamyl acetate in ionic liquid solvents is reported. As a catalyst, immobilized Candida antarctica lipase B was used. As the best imidazolium type ionic liquid, [bmim]PF6 was selected and othe...

Tertiary-butyl acetate (TBAC) was tested for subchronic toxicity in rats and mice and reproductive toxicity in rats at inhalation concentrations of 0, 100, 400 or 1600 ppm. An oral maternal toxicity study was conducted in rats at dose levels of 0, 400, 800, 1000 and 1600 mg kg−1 d−1. In the inha...

This paper discusses the feasibility of using membranes based on cellulose acetate butyrate/poly(caprolactone)triol loaded with doxycycline for guided bone regeneration. Those membranes were obtained by solvent casting varying the cellulose acetate butyrate: poly(caprolactone)triol:doxycycline (...

Asymmetric silylation of alcohols is an unusual but effective approach to their kinetic resolution, and the Cu–H-catalyzed dehydrogenative Si–O coupling is particularly noteworthy as dihydrogen is formed as the sole by-product. Our laboratory had previously reported on diastereoselective (with...

We investigated the effect of substances present in Japanese sake on the response of ionotropic γ-aminobutyric acid (GABA)A receptors expressed in Xenopus oocytes. Sake was fractionated by ion-exchange chromatography. The fraction containing organic acids (OA fraction) showed agonist activities...

SPME GC–MS analysis of the volatile fraction from 22 Spanish eucalyptus honeys revealed two components which were present in all samples. From their mass spectra they were tentatively assigned as 2-hydroxy-5-methyl-3-hexanone and 3-hydroxy-5-methyl-2-hexanone. As no commercial standards were av...