Sorption of hydrophilic dyes on anodic aluminium oxide films and application to pH sensing

The Analyst ◽  
2015 ◽  
Vol 140 (3) ◽  
pp. 771-778 ◽  
Author(s):  
Yuliya E. Silina ◽  
Tatyana A. Kuchmenko ◽  
Dietrich A. Volmer
Keyword(s):  
Methyl Orange ◽  
Congo Red ◽  
Rhodamine 6G ◽  
Aluminium Oxide ◽  
Bromothymol Blue ◽  
Bromophenol Blue ◽  
Bromocresol Purple ◽  
Ph Sensing ◽  
Alizarin Red ◽  
Ph Sensitive Dyes

The sorption of selected hydrophilic pH-sensitive dyes (bromophenol blue, bromothymol blue, bromocresol purple, alizarin red, methyl orange, congo red, rhodamine 6G) on films of anodized aluminium oxide (AAO) was investigated in this study.

scholarly journals Extractive Spectrophotometric Determination of Tenofovir Disoproxil Fumarate Using Acidic Triphenylmethane Dyes

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
K. Susmitha ◽  
M. Thirumalachary ◽  
T. Charan Singh ◽  
G. Venkateshwarlu
Keyword(s):  
Tenofovir Disoproxil Fumarate ◽  
Pharmaceutical Formulations ◽  
Transcriptase Inhibitor ◽  
Bromothymol Blue ◽  
Bromophenol Blue ◽  
Bromocresol Purple ◽  
Triphenylmethane Dyes ◽  
Spectrophotometric Methods ◽  
Nucleotide Reverse Transcriptase Inhibitor

Tenofovir disoproxil fumarate is a nucleotide reverse transcriptase inhibitor that has activity against the hepatitis B and HIV viruses. Three simple and sensitive extractive spectrophotometric methods have been described for the assay of tenofovir disoproxil fumarate either in pure form or in pharmaceutical formulations. The developed methods involve formation of colored chloroform extractable ion-pair complexes of the drugs with triphenylmethane dyes, namely, bromothymol blue (BTB), bromophenol blue (BPB), and bromocresol purple (BCP) in acidic medium. The extracted complexes showed absorbance maxima between 410 and 415 nm. Beer’s law is obeyed in the concentration ranges 1.5–25, 1.0–25, and 1.25–25 μg mL−1 with BTB, BPB, and BCP, respectively. The effectc of concentration of dye, pH, and interference of excipients have been studied and optimized. The limits of detection and quantification have been determined. All three methods are validated as per the guidelines of ICH. The methods have been applied to the determination of drug in commercial tablets and results of analysis were validated statistically through recovery studies.

scholarly journals Spectrophotometric Determination of Gemifloxacin Mesylate, Moxifloxacin Hydrochloride, and Enrofloxacin in Pharmaceutical Formulations Using Acid Dyes

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Ayman A. Gouda ◽  
Alaa S. Amin ◽  
Ragaa El-Sheikh ◽  
Amira G. Yousef
Keyword(s):  
Pharmaceutical Formulations ◽  
Bromothymol Blue ◽  
Bromocresol Green ◽  
Bromophenol Blue ◽  
Bromocresol Purple ◽  
Acid Dyes ◽  
Spectrophotometric Methods ◽  
Significant Difference ◽  
Comparison Of The Results

Simple, rapid, and extractive spectrophotometric methods were developed for the determination of some fluoroquinolones antibiotics: gemifloxacin mesylate (GMF), moxifloxacin hydrochloride (MXF), and enrofloxacin (ENF) in pure forms and pharmaceutical formulations. These methods are based on the formation of ion-pair complexes between the basic drugs and acid dyes, namely, bromocresol green (BCG), bromocresol purple (BCP), bromophenol blue (BPB), bromothymol blue (BTB), and methyl orange (MO) in acidic buffer solutions. The formed complexes were extracted with chloroform and measured at 420, 408, 416, 415, and 422 nm for BCG, BCP, BPB, BTB, and MO, respectively, for GMF; at 410, 415, 416, and 420 nm for BCP, BTB, BPB, and MO, respectively, for MXF; and at 419 and 414 nm for BCG and BTB, respectively, in case of ENF. The analytical parameters and their effects are investigated. Beer’s law was obeyed in the ranges 1.0–30, 1.0–20, and 2.0–24 μg mL−1for GMF, MXF, and ENF, respectively. The proposed methods have been applied successfully for the analysis of the studied drugs in pure forms and pharmaceutical formulations. Statistical comparison of the results with the reference methods showed excellent agreement and indicated no significant difference in accuracy and precision.

scholarly journals Biosorption of Bromo-based Dyes from Wastewater Using Low-Cost Adsorbents: A Review

2020 ◽  
pp. 34-56
Author(s):  
Ebenezer Olujimi Dada ◽  
Ilesanmi Ademola Ojo ◽  
Abass Olanrewaju Alade ◽  
Tinuade Jolaade Afolabi ◽  
Monsurat Omolola Jimoh ◽  
...  
Keyword(s):  
Effective Treatment ◽  
Adsorption Process ◽  
Low Cost ◽  
Agricultural Waste ◽  
Bromothymol Blue ◽  
Bromocresol Green ◽  
Bromophenol Blue ◽  
Bromocresol Purple ◽  
Aquatic Communities ◽  
Triarylmethane Dyes

The dyes in the effluents discharged into water bodies, aimlessly, are displeasing aesthetically and pose hazards to aquatic communities. The use of adsorption process has been adopted for effective treatment of wastewater containing dyes. The removal of Bromophenol blue (BPB), Bromocresol green (BCG), Bromocresol purple (BCP), and Bromothymol blue (BTB) dyes (a family of triarylmethane dyes) through adsorption process using several cheaply available non-conventional agricultural-waste based adsorbents was reviewed in this report. The gaps in the treatment trend further indicate the prospect of adapting various lignocellulose and other biogenic materials for the removal of Bromo-based dyes from wastewater.

scholarly journals Determination of acid dissociation constants of Alizarin Red S, Methyl Orange, Bromothymol Blue and Bromophenol Blue using a digital camera

RSC Advances ◽  
2020 ◽  
Vol 10 (19) ◽  
pp. 11311-11316
Author(s):  
Ahmed A. Shalaby ◽  
Ashraf A. Mohamed
Keyword(s):  
Dissociation Constants ◽  
Inorganic Compounds ◽  
Digital Camera ◽  
Bromothymol Blue ◽  
Acid Dissociation ◽  
Bromophenol Blue ◽  
Acid Dissociation Constants ◽  
Alizarin Red

Acid dissociation constants (pKa) are important parameters for the characterization of organic and inorganic compounds.

scholarly journals Spectrophotometric Studies on the Reaction of Diaveridine with Some Sulfonphthalein Dyes Based on Ion-Pair/Ion-Associate Complexes Formation

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
A. L. El-Ansary ◽  
N. S. Abdel-Kader ◽  
A. M. Asran
Keyword(s):  
Spectral Characteristics ◽  
Pharmaceutical Preparations ◽  
Bromothymol Blue ◽  
Molar Absorptivity ◽  
Molecular Structures ◽  
Bromocresol Green ◽  
Bromophenol Blue ◽  
Bromocresol Purple ◽  
Donor And Acceptor ◽  
Ion Associate

The ion-associate complexes of diaveridine were prepared in a solution and studied spectrophotometrically. The bulky counter anions such as sulfonphthalein acidic dyes, namely, bromocresol green (I), bromophenol blue (II), bromothymol blue (III), bromocresol purple (IV), bromocresol blue (V), o-cresol red (VI), p-cresol blue (VII), and m-cresol purple (VIII) were used for ion-associate complexes formation. The optimal characteristics for the color formation and the stoichiometry of the reaction were evaluated. Spectral characteristics and stability constants of the formed ion associates are discussed in terms of nature of donor and acceptor molecular structures. The molar absorptivities and association constants for the colored complexes were evaluated using the Benesi-Hildbrand equation. Conformity to Beer’s law enabled the assay of dosage form of the drug. The molar absorptivity, specific absorptivity, Sandell sensitivity, correlation coefficient, and detection and quantification limits were also calculated. The methods were validated in terms of accuracy, specificity, precision, and linearity. Also, spectrophotometric determination of the drug in pure and pharmaceutical preparations was tested.

Spectrophotometric quantification of fluoxetine hydrochloride: Application to quality control and quality assurance processes

2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Alaa Amin ◽  
Ibrahim Ahmed ◽  
Hassan Dessouki ◽  
Hassan Mohamed
Keyword(s):  
Biological Fluids ◽  
Standard Addition ◽  
Bromothymol Blue ◽  
Molar Absorptivity ◽  
Bromocresol Green ◽  
Bromophenol Blue ◽  
Bromocresol Purple ◽  
Spectrophotometric Methods ◽  
Fluoxetine Hydrochloride ◽  
Relative Standard

AbstractSimple and rapid spectrophotometric methods have been developed for the microdetermination of fluoxetine HCl. The proposed methods are based on the formation of ion-pair complexes between fluoxetine and bromophenol blue (BPB), bromothymol blue (BTB), bromocresol green (BCG), and bromocresol purple (BCP) which can be measured at optimum λmax. Optimization of reaction conditions was investigated. Beerșs law was obeyed in the concentration ranges of 0.5–8.0 μg mL−1, whereas optimum concentration as adopted from the Ringbom plots was 0.7–7.7 μg mL−1. The molar absorptivity, Sandell sensitivity, and detection limit were also calculated. The most optimal and sensitive method was developed using BCG. The correlation coefficient was 0.9988 (n = 6) with a relative standard deviation of 1.25, for six determinations of 4.0 μg mL−1. The proposed methods were successfully applied to the determination of fluoxetine hydrochloride in its dosage forms and in biological fluids (spiked plasma sample) using the standard addition technique.

Sign in / Sign up

Export Citation Format

Share Document