Results 21 to 30 of about 6,886 (184)

Smart chemometrics-assisted spectrophotometric methods for efficient resolution and simultaneous determination of paracetamol, caffeine, drotaverine HCl along with three of their corresponding related impurities

BMC Chemistry, 2023
Three novel, simple and accurate multivariate spectrophotometric assisted mathematical techniques were developed for determination of paracetamol, caffeine, drotaverine HCl and their related impurities.
Samia A. Tawfik, Maha A. Hegazy, Nariman A. El-Ragehy, Ghada A. Sedik   +3 more
doaj   +1 more source

Development of an Electrochemical Bioassay Based on the Alkaline Phosphatase Activity of Chlamydomonas reinhardtii to Assess the Toxicity of Heavy Metals

International Journal of Electrochemical Science, 2016
A novel electrochemical bioassay for the rapid and sensitive evaluation of heavy metals toxicity was developed using the alkaline phosphatase activity of Chlamydomonas reinhardtii (C. reinhardtii).
Haitao Jiang, Md Saiful Islam, Kazuto Sazawa, Noriko Hata, Shigeru Taguchi, Shogo Nakamura, Kazuharu Sugawara, Hideki Kuramitz   +7 more
doaj   +1 more source

Adsorption of Aromatic Compounds from Aqueous Solution by a Hypercrosslinked Polymeric Adsorbent with Sulphonic Groups

Adsorption Science & Technology, 2003
A hypercrosslinked polymeric adsorbent with sulphonic groups, NG-5, was employed to remove p -toluidine, p -aminophenol and phenol from aqueous solutions and its performance and thermodynamic behaviour compared to that of the hypercrosslinked polymeric ...
Hai-Ling Wang, Jin-Long Chen, Ai-Min Li, Zhi-Cai Zhai, Zheng-Hao Fei, Quan-Xing Zhang   +5 more
doaj   +1 more source

Simple and rapid hydrogenation of p-nitrophenol with aqueous formic acid in catalytic flow reactors

Beilstein Journal of Organic Chemistry, 2013
The inner surface of a metallic tube (i.d. 0.5 mm) was coated with a palladium (Pd)-based thin metallic layer by flow electroless plating. Simultaneous plating of Pd and silver (Ag) from their electroless-plating solution produced a mixed distributed ...
Rahat Javaid, Shin-ichiro Kawasaki, Akira Suzuki, Toshishige M. Suzuki   +3 more
doaj   +1 more source

Hydrodynamic Voltammetry as a Rapid and Simple Method for Evaluating Soil Enzyme Activities

Sensors, 2015
Soil enzymes play essential roles in catalyzing reactions necessary for nutrient cycling in the biosphere. They are also sensitive indicators of ecosystem stress, therefore their evaluation is very important in assessing soil health and quality.
Kazuto Sazawa, Hideki Kuramitz
doaj   +1 more source

Polyaminoanthraquinone Modified Electrodes as Electroanalytical Sensors

International Journal of Electrochemical Science, 2011
Poly 1-amino-9,10-anthraquinone, PAAQ, films were prepared by the electropolymerization of 1-amino-9,10-anthraquinone, AAQ, on platinum substrates. The polymerization process was carried out in both nonaqueous (Acetonitrile containing 0.1 mole L-1 LiClO4
Waheed A. Badawy, Khaled M. Ismail, Shymaa S. Medany   +2 more
doaj   +1 more source

Nickel on Oxidatively Modified Carbon as a Promising Cost-Efficient Catalyst for Reduction of P-Nitrophenol

Molecules, 2022
The reduction of p-nitrophenol to p-aminophenol has become a benchmark reaction for testing the efficiency of new catalytic systems. In this study, we use oxidatively modified carbon (OMC) as a structural support to develop a new cost-efficient nickel ...
Shamil Galyaltdinov, Anna Svalova, Vasiliy Brusko, Maria Kirsanova, Ayrat M. Dimiev   +4 more
doaj   +1 more source

Advances in selective hydrogenation of nitrobenzene toward p-aminophenol

Sustainable Chemistry for Climate Action
p-Aminophenol is an important intermediate for dyestuff, medical and rubber. Selective hydrogenation of nitrobenzene is a green and environmentally friendly preparation process for the p-aminophenol synthesis.
Jinzhi Lu, Hao Wang, Xiao Cai, Yan Zhu
doaj   +1 more source

Synthesis of New Azo Compounds Based on N-(4-Hydroxypheneyl)maleimide and N-(4-Methylpheneyl)maleimide

Molecules, 2010
Maleic anhydride was reacted with p-aminophenol and p-toluidine in the presence of di-phosphorus pentoxide (P2O5) as a catalyst to produce two compounds: N-(4-hydroxy-phenyl)maleimide (I) and N-(4-methylphenyl)maleimide (II). The new azo compounds I(a-c)
Issam Ahmed Mohammed, Asniza Mustapha
doaj   +1 more source

Spectrophotometric Determination of Some Phenolic Compounds Using N,N- diethyl –p-phenylenediamine (DE – PPD) and Benzoyl peroxide [PDF]

مجلة التربية والعلم, 2013
A rapid and sensitive spectrophotometric method has been developed for the determination of some phenolic compounds (phenol, o-aminophenol and α-naphthol) and was applied for determination of amoxicillin drug.
Elham S. Salih, M. M. Al- sharook, Saladdin M. AL-Talib   +2 more
doaj   +1 more source