fecl3.6h2o was used as an efficient catalyst for the synthesis of highly functionalized piperidines via a one-pot five-component reaction of aromatic amines, aromatic aldehydes and β-keto esters in etoh at room temperature. the remarkable advantages offered by this method are good yields, simple procedure, short reaction times, no need to column chromatography and easy work-up. the structures o...

The need to understand and control ester synthesis is driven by the fact that esters play a key role in the sensorial quality of fermented alcoholic beverages like beer, wine and sake. As esters are synthesized in yeast via several complex metabolic pathways, there is a need to gain a clear understanding of ester metabolism and its regulation. The individual genes involved, their functions and ...

Rat pancreatic juice cholesterol ester hydrolase (EC 3.1.1.13) has been purified 600-fold by sequential precipitation with 35 % acetone, diethylaminoethyl cellulose chromatography, and hydroxylapatite chromatography. The purified enzyme gives a single band on polyacrylamide disc electrophoresis and will not hydrolyze methyl butyrate, triolein, or secondary alcohol esters. Data are presented tha...

Novel routes for the preparation of 2-amino-4H-pyran-3-carbonitrile 9, amino-arylbenzoic acid ester derivatives 13a,b, 2-aminotetrahydro-4H-chromene-3-carbonitrile 18, 3-amino-4-cyanotetrahydronaphthalene-2-carboxylic acid ester 26 and 4-amino-3,5-dicyanophthalic acid ester derivatives 37a-c were developed. The synthetic methods utilize one-pot reactions of acetylene carboxylic acid esters, α,β...

The analysis of the ultraviolet induced transformation thermal decomposition spectra monomer submicrometer layers polymethylmethacrylate and its composite with fullerene C 60 for different concentrations irradiation doses has been carried out. Formation new stages in interpreted by binding between side ester groups polymethylmethacrylate. Keywords: polymethylmethacrylate, fullerene, irradiation...

Some more properties of a particulate enzyme preparation from mung bean shoots capable of the formation of polygalacturonate as well as its methyl ester are reported. 1. When the preparation was freed of traces of endogenous nucleotide uronic acids by digestion with phosphodiesterase or by preincubation up to 2 hours, the methylation was still possible. This sustains the recently made proposal ...

Eight commercial beers (3 lager beers, 2 dark ales and 3 high-alcoholic ales) were aged for one year under normal storage conditions, and the changes with time of flavour profile and the concentration of 15 volatile compounds were monitored. The compounds were chosen as markers to evaluate the importance of different reactions in the aging process of each beer type. The development of typical a...

Methyl mercaptan is a naturally occurring compound known to be formed and utilized by living organisms. It can arise in microorganisms (1) and in the rat (2) from methionine. It is rapidly oxidized in the rat, and its methyl carbon atom is incorporated into a number of compounds in this animal (3). In yeast cultures it promotes the accumulation of thiomethyl adenosine (4). Reported here is a re...

Mechanical stimulation by the extracellular matrix (ECM) controls physiological and pathological cellular responses, such as stem cell differentiation, organogenesis, tumor progression. Polyacrylamide (PA) gels have been widely used to study cell-ECM mechanical interactions. Typically, sulfosuccinimidyl 6-(4′-azido-2′-nitrophenylamino)hexanoate (sulfo-SANPAH) is a protein crosslinker in these g...

Novel nanoporous film materials of thermostable cyanate ester resins (CERs) were generated by polycyclotrimerization of dicyanate ester of bisphenol E in the presence of varying amounts (from 20 to 40 wt%) of an ionic liquid (IL), i.e., 1-heptylpyridinium tetrafluoroborate, followed by its quantitative extraction after complete CER network formation. The completion of CER formation and IL extra...