نتایج جستجو برای: vis spectrophotometry

تعداد نتایج: 31365  

Journal: :the iranian journal of pharmaceutical research 0
seyed karim hassaninejad-darzi department of chemistry, faculty of science, babol university of technology, babol, iran. abdolraouf samadi-maybodi analytical division, faculty of chemistry, university of mazandaran, babolsar, iran. seyed mohsen nikou analytical division, faculty of chemistry, university of mazandaran, babolsar, iran.

resolution of binary mixtures of theophylline (theo), montelukast (mkst) and loratadine (lora) with minimum sample pretreatment and without analyte separation has been successfully achieved by multivariate spectrophotometric calibration, together with partial least-squares (pls-1), principal component regression (pcr) and hybrid linear analysis (hla). data of analysis were obtained from uv–vis ...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2003
Juan M Bosque-Sendra Eva Almansa-López Ana Ma García-Campaña Luis Cuadros-Rodríguez

The determination of stoichiometries and stability constants of complexes by means of UV-visible spectrophotometry applying traditional methods does not evaluate the quality of the values obtained, since the classic application of these methods does not provide coverage intervals. However, the use of chemometric techniques in different steps of the application of these methods makes it possible...

Journal: :Dalton transactions 2014
Sarayut Watchasit Pattira Suktanarak Chomchai Suksai Vithaya Ruangpornvisuti Thawatchai Tuntulani

In this research, the dinuclear Zn(ii) complex of anthracene based tripodal tetramine Zn2L was synthesized, and its sensing abilities towards anions was investigated using the indicator displacement assay (IDA) approach with four complexometric indicators: pyrocatechol violet (PV), bromopyrogallol red (BPG), methylthymol blue (MTB) and xylenol orange (XO). UV-vis spectrophotometry results indic...

2007
S. Oszwaldowski L. Vasicek T. Tonev

Stable water soluble surfactant coated CdSe nanocrystals with trioctylphosphine (TOP) were obtained by a process of dynamic surface coating with cationic, anionic, and non-ionic surfactants. The surfactant-coated CdSe/TOP nanocrystals were characterized by complementary techniques of UV-VIS and photo-luminescence spectrophotometry, as well as by means of a capillary zone electrophoretic techniq...

Journal: :Advanced materials 2012
Justin G Railsback Abhishek Singh Ryan C Pearce Timothy E McKnight Ramón Collazo Zlatko Sitar Yaroslava G Yingling Anatoli V Melechko

Weakly charged cationic nanoparticles cause structural changes including local denaturing and compaction to DNA under mild conditions. The charged ligands bind to the phosphate backbone of DNA and the uncharged ligands penetrate the helix and disrupt base pairing. Mobility shifts in electrophoresis, molecular dynamics, and UV-vis spectrophotometry give clues to the details of the interactions.

Journal: :The journal of physical chemistry. B 2005
Jill K Sakata Andrew D Dwoskin John L Vigorita Eileen M Spain

We report a wet-chemical method to make films by spontaneous assembly of passivated Ag nanoparticles at the organic-aqueous liquid interface. The interfacial films exhibit a blue opalescence and are characterized with transmission electron microscopy and UV-vis spectrophotometry. Measurements indicate that nanoparticles in the interfacial film can form superlattices and in some cases nanostruct...

Journal: :Roczniki Panstwowego Zakladu Higieny 2008
Agnieszka Gawłoska-Kamocka

The results of determination of trace quantites of selenium in various commercial natural fruit juices by three independent methods: atomic absorption spectrometry (AAS), spectrophotometry (UV-VIS) and spectrofluorometry (SF) were presented. The level of selenium in any of the analysed samples of fruit juices did not exceed the WHO recommended level of 0.010 mg/l for drinking water.

2012
Mohammadreza Khanmohammadi Nasser Dalali Farshad Karami Amir Bagheri Garmarudi Hossein Nemati

Formaldehyde is a vastly used material in industry. Nowadays, it is proven that formaldehyde is toxic and carcinogenic. Thus providing a reliable method for its quantitative determination is very important. This study proposes a UV-Vis spectrophotometric based method for determination of formaldehyde. The method is based on reaction between the analyte and Fluoral P. Spectral changes during the...

Journal: :Molecules 2016
Fatemeh Ghodsi Sayyed Mostafa Habibi-Khorassani Mehdi Shahraki

The kinetics of the reaction between triphenylphosphine (TPP) and dimethyl acetylenedicarboxylate (DMAD) in the presence of Meldrum's acid (MA) for the generation of the 1,4-diionic organophosphorus compound has been investigated using the stopped-flow and UV-VIS spectrophotometry techniques. The first step of the reaction between TPP and DMAD for the generation of (I₁) in ethanol was followed ...

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