Bromocresol purple (BCP), bromophenol blue (BPB) and bromothymol blue (BTB) were used to determine alfuzosin hydrochloride either in pure form or in pharmaceutical formulations. Alfuzosin was extracted as an ion-pair complex from sample solution containing KCl-HCl buffer pH2.2, 2.4 and 2.6 into CHCl3 and the absorbance was measured at 407, 413 and 412nm with use of the cited reagents, respectiv...

A method for the rapid determination of double-layer capacitancepotential curves of electrodes is described. An on-line computer is used to apply Kalousek-type waveforms to the electrochemical cell and to measure the accompanying current response. The capacitances am determined from the slope of the plots of log current against timeFor 0.1 M KCI, the computerized method agrees weli with the bri...

A new method of detecting urease activity in Enterobacteriaceae was developed. An 8.5 cm filter paper disc impregnated with 20% urea and 0.5% bromocresol purple was placed on the surface of a glucose fermentation plate after inoculation with a multipoint replicator and overnight incubation. This method was compared with the commercially prepared Mast urea agar (Multipoint) and Fuscoe's Urea Pla...

The light-induced proton uptake of rod outer segment disc membranes has been investigated in the absence and presence of G-protein. Proton uptake was measured as the alkalisation of the suspending medium using a pH electrode and/or the indicator dye bromocresol purple. It was found that besides the known proton uptake of photolysed rhodopsin additional uptake of one proton accompanies formation...

Two simple, rapid, and extractive spectrophotometric methods were developed for the determination of tropicamide (TPC). These methods are based on the formation of ionpair complexes between the basic nitrogen of the drug with bromocresol purple (BCP) and methyl orange (MO) in acidic buffer solution. The formed complexes were extracted with chloroform and measured at 408 and 427 nm using BCP and...

Optical chemical sensors can yield distinctively different responses that are dependent on the method applied for readout and evaluation. We therefore present a comprehensive study pH determined non-continuously with optical in real milk samples by either photometry or colorimetry (via RGB-readout of digital images) compared to values obtained electrochemically potentiometry. Additionally, phot...

La contaminación de agua residual con materia orgánica y compuestos aromáticos es un problema cada vez más complejo que demanda sistemas tratamiento eficientes. El objetivo este trabajo evaluar el efecto del tamaño partícula TiO2 en la oxidación fotocatalítica púrpura bromocresol usado como modelo contaminante orgánico. se inmovilizó sobre sustrato borosilicato mediante técnica revestimiento po...

background and objectives: acetic acid bacteria (aab) are useful in industrial production of vinegar. the present study aims at isolation and identification of acetic acid bacteria with characterization, optimization, and evaluation of their acetic acid productivity. materials and methods: samples from various fruits were screened for presence of acetic acid bacteria on glucose, yeast extract, ...

this paper classifies green envelopes as green roofs and green walls according to effective factors, which were derived from literature to compare the green envelopes’ thermal and energy performance in a more effective way. for this purpose, an extensive literature review was carried out by searching keywords in databases and studying related journal papers and articles. the research method for...