The aim was to study how factors such as temperature, alcoholic degree, and amino acids supplementation are able to influence the content of tyramine, histamine, 2-phenylethylamine, tryptamine and their precursor amino acids in winemaking process. Biogenic amines and amino acids were quantified ...

The objective of this work was the evaluation of different conditions for the selected free amino acids extraction from cheese samples, followed by capillary isotachophoresis analysis. Parameters of the extraction: concentration and type of extraction reagents (solvents: methanol, ethanol and mi...

The proposed analytical method reports the separation and quantification of 21 amino acids including l-citrulline from fresh vegetables and commercial juices using a C8 column. Optimal separation conditions for amino acids analysis were obtained with 20 mM sodium acetate (solvent A) and water wi...

The study presents the validation results of the method carried out for analysis of free amino acids (FAAs) in rice using l-theanine as the internal standard (IS) with o-phthalaldehyde (OPA) reagent using high-performance liquid chromatography-fluorescence detection. The detection and quantifica...

The pentakis complex of copper(II) perchlorate with antipyrine(apy) and the bis complexes with diantipyrylmethane(dapy) and diantipyrylpropylmethane(dapyp) have been prepared and characterized. Electronic spectral and ESR data for the distortion isomers of Cu(dapy)2(ClO4)2 show that the red form...

Zirconium and hafnium are extracted quantitatively into chloroform, dichloroethane or nitrobenzene in the presence of hexyl-, nonyl- and o-nitrophenyl diantipyrylmethane from hydrochloric acid solutions (⩾ 8 M) in the form of RMeCl4 ,complexes. New methods of determining up to 1·10−4% zirconium...

Diantipyrylmethane is used for substoichiometric extraction of tantalum from 1—4M hydrofluoric acid into 1,2-dichlorethane. The selectivity of the method is good, niobium and antimony(V) being the main inteferences. The stoichiometric composition of the tantalum/diantipyrylmethane complex is 1:...

The optimum fluorescence conditions for erbium (III) are obtained by irradiating this lanthanide at 435 nm in 0.04 μg ml−1 diantipyrylmethane solution at pH=8 (λem=510 nm ). The method proposed is satisfactory for the determination of erbium (III) in the range of 0.001 to 1 μg ml−1. The relat...

The reversible photoreduction of methylene blue in acrylate media is studied here. Methylene blue can be photoreduced using a benzyl dimethyl ketal photoinitiator upon 365 nm irradiation. The photoreduction is due to the interaction of methylene blue with methyl radical which is generated when b...

A series of thiocholesterol-based cationic lipids (TCL) has been designed and synthesized by the attachment of thiocholesterol to a cationic amine via a disulfide bond. TCL can be incorporated into liposomes and used to package DNA into a lipoplex, thereby protecting it from DNase digestion. DNA...

We performed differential scanning calorimetric (DSC) and Fourier transform infrared (FTIR) spectroscopic studies of the effects of cholesterol (Chol), thiocholesterol (tChol) and cholesterol sulfate (CholS) on the thermotropic phase behavior and organization of dipalmitoylphosphatidylcholine (D...

The present study is an attempt to understand the properties of an interesting self-assembled monolayer system composed of inclusion complexes of thiocholesterol and cyclodextrins. Cyclodextrins were used as host compound while thiocholesterol was used as the entrant molecule into the cavity of ...

The self-assembled monolayer of the thiocholesterol (TCh) exhibits interesting properties that can be used for various technological applications. TCh is predominantly a hydrophobic molecule, and it does not spread at the air–water interface to form a stable Langmuir monolayer. We have stabiliz...

Synthesis, aggregation behavior and in vitro cholesterol solubilization studies of 16-epi-pythocholic acid (3α,12α,16β-trihydroxy-5β-cholan-24-oic acid, EPCA) are reported. The synthesis of this unnatural epimer of pythocholic acid (3α,12α,16α-trihydroxy-5β-cholan-24-oic acid, PCA) invol...

Crystal structures of p-xylene-crystallized deoxycholic acid (3α,12α-dihydroxy-5β-cholan-24-oic acid) and its three epimers (3β,12α-; 3α,12β-; and 3β,12β-) have been solved. Deoxycholic acid forms a crystalline (P21) complex with the solvent with a 2:1 stoichiometry whereas crystals of ...

3α-Acetoxy-4α,5-epoxy-4β-methyl-5α-cholestane (Ia) undergoes a “backbone rearrangement” with BF3etherate to give the (enantio) 5β,14β-dimethyl-18,19-bisnorcholest-13(17)-ene derivative (IIa). One of the products obtained from reaction of 3α-acetoxy-4α,5-epoxy-5α-cholestane (Ib) with a...

Valuable compounds, naphthylarylketones are synthesized via oxy-Wittig (oxygenation of phosphonate carbanions) type reactions of diverse 1-naphthyl(aryl)methylphosphonates at room temperature by producing water soluble by-product. Commercially known but synthetically unexposed and expensive naph...

Increased awareness of phthalic acid esters (PAEs) toxicity has given rise to a dramatic increase in concern about the determination of these contaminations in the environment. In this paper, a sensitive, selective and rapid enzyme immunoassay of ELISA based on polyclonal antibody for detecting ...

Mycophenolic sodium is an immunosuppressive agent that is always combined administration with corticosteroid in clinical practice. Considering the distribution and side-effect of the drug may change when co-administrated drug exist, this paper comparatively analyzed the binding ability of mycoph...

Publisher SummaryThis chapter discusses the potassium penicillin V. The chapter contains updated information pertaining to the analytical chemistry of potassium phenoxymethylpenicillin. The original profile2 contains the infrared spectrum of potassium phenoxymethylpenicillin prepared as a potass...