نتایج جستجو برای: Porphyrins

تعداد نتایج: 3593  

Journal: :journal of physical & theoretical chemistry 2005
h. aghaie m. keshavarz k. zare m. aghaie a.k. bordbar

in order to shed more light on the effect of peripheral groups of porphyrin core intophysicochemical properties and dna binding behavior of porphyrins, we have chosen toinvestigate solution properties and calf thymus dna binding behavior of meso-tetrakis (4-nbenzyl-pyridyl) porphyrin (tbzpyp) and its mn (iii), co (iii), ni (ii) and cu (ii) complexesderivatives have been studied in thermodynamic...

Journal: :Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 2012
Ting-xiu Ye Shu-lan Ye Dong-mei Chen Qing-ai Chen Bin Qiu Xi Chen

In this study, the noncovalent functionalization of graphene with cationic porphyrins in an aqueous medium was investigated using UV-vis and fluorescence approaches. To characterize the interaction between graphene and cationic porphyrins, 5,10,15,20-tetra (4-pyridyl)-21H,23H-porphine, 5,10,15,20-tetrakis (1-methyl-4-pyridinio) porphyrin tetra (p-toluenesulfonate) and 5,10,15,20-tetrakis (4-tri...

Journal: Journal of Nanoanalysis 2015
M. Danish M. Yasin R. Asim S. Khaliq

Porphyrins molecules are gaining importance in the present era. Porphyrins are important part of biological molecules like hemoglobin and chlorophyll .Photo system 1 and photo system 2 is important sunlight trap in chloroplast. Electron transport chain is a series of chemical reaction in which energy is formed in the form of ATP (Adenosine triphosphate).The members of electron transport chains ...

Journal: :Geosciences 2022

Porphyrins are highly persistent in the environment and represent a helpful biogeochemical attribute to assess spatial distribution of effects oil spills on ecosystems their resilience. In areas prone natural human-originated spills, measurement VO– nickel–porphyrins marine–sediment samples can identify pollution across spatiotemporal scales. The goal is explore whether or not these compounds b...

Journal: :Chemical communications 2007
Ken-ichi Sugiura Aiko Kato Kentaro Iwasaki Hitoshi Miyasaka Masahiro Yamashita Shojun Hino Dennis P Arnold

The reaction of Hg(CF3CO2)2 with metalloporphyrins produces mercurated porphyrins regioselectively, the reaction, surprisingly occurring at the most hindered betaB-position; this behavior is in marked contrast to the usual electrophilic substitution reactions of porphyrins, whose reactions produce meso-substituted porphyrins; the obtained mercurated porphyrins are active to transition metal-cat...

Journal: :Materials advances 2021

Encapsulation of glycosylated porphyrins in silica nanoparticles enhanced the efficacy cancer photodynamic therapy compared with free porphyrins.

Journal: :Clinical chemistry 1967
T C Chu E J Chu

Porphyrins from 38 cases of different types of porphyria were separated chromatographically and analyzed. Patients with different types of porphyria eliminated porphyrins with different patterns. Simple paper chromatography of the methyl ester of the total porphyrin of a urine sample revealed a chromatographic pattern of the porphyrins characteristic of the type of porphyria. The relative abund...

A.K. Bordbar H. Aghaie K. Zare M. Aghaie M. Keshavarz

In order to shed more light on the effect of peripheral groups of porphyrin core intophysicochemical properties and DNA binding behavior of porphyrins, we have chosen toinvestigate solution properties and calf thymus DNA binding behavior of meso-tetrakis (4-Nbenzyl-pyridyl) porphyrin (TBZPyP) and its Mn (III), Co (III), Ni (II) and Cu (II) complexesderivatives have been studied in thermodynamic...

Journal: :The Journal of biological chemistry 1951
J LUCAS J M ORTEN

The present investigation was undertaken because of the need for a more practicable procedure for isolating pure porphyrins from biological materials. The existing methods, based primarily on solvent fractionation, on adsorption chromatography with calcium carbonate, talc, aluminum oxide, or other adsorbents, or on a combination of the two procedures, have failed in our hands to give an entirel...

Journal: :Clinical science 1970
E Dowdle P Goldswain N Spong L Eales

1 . Thin-layer chromatography of porphyrin methyl esters provides a useful and rapid technique for resolving mixtures of porphyrins from biological samples. 2. Application of this technique to urinary, faecal and hepatic porphyrins from patients with symptomatic porphyria revealed five porphyrins of interest which could be identified by mass spectrometry as the methyl esters of porphyrins with ...

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