Mn-tetratolylporphyrin-Nano-Au complex sensitive to 4-aminosalicylic acid

Lascu Anca and Anghel Diana and Tăranu Bogdan and Salageanu Luminita: Mn-tetratolylporphyrin-Nano-Au complex sensitive to 4-aminosalicylic acid.

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Porphyrins and metalloporphyrins provide recognition sites for amino acids both through their cationic central metal ion and due to various functional groups at the four mesoand the eight β-positions of pyrolles. Immobilized metallo-phenylporphyrins can be used as sensitive and selective sensors for different analytes as they provide two ways of interaction via the metallic center of porphyrin and between the  electrons of the macrocycles and the solute [1]. The purpose of this study was to establish an easy way to determine low concentrations of 4-aminosalycilic acid (PAS) using hybrid materials obtained from porphyrins, namely: Mn(III)-tetratolylporphyrin chloride (MnTTPCl) and gold nanoparticles (n-Au). During the adding of 4-aminosalycilic acid to the MnTTPCl-nAu hybrid it can be observed that the intensity of the plasmonic band is continuously decreasing with the increase in 4-aminosalycilic acid concentration. Another notable feature is the bathochromic shift of the major peak to higher wavelengths from 619 nm to 622 nm. Equilibria processes are involved and accompanied by an isosbestic point around 725 nm. The dependence between the absorption intensity of the plasmonic complex and the concentration of 4-aminosalicylic acid is linear, with an excellent corelation coefficient of 99.31% in a wide range of 4- aminosalicylic acid concentrations: 2.88x10-5M - 8.89x10-4M.

Item Type: Conference or Workshop Item
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2018
Volume: 24
ISBN: 978-963-306-623-2
Page Range: pp. 69-73
Event Title: International Symposium on Analytical and Environmental Problems (24.) (2018) (Szeged)
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Uncontrolled Keywords: Kémia
Additional Information: Bibliogr.: 73. p. ; ill. ; összefoglalás angol nyelven
Date Deposited: 2019. Jan. 04. 07:16
Last Modified: 2022. Aug. 08. 15:50

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