optode membrane
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Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 262
Author(s):  
Akane Funaki ◽  
Yuta Horikoshi ◽  
Teruyuki Kobayashi ◽  
Takashi Masadome

A new determination method for polyhexamethylene biguanide hydrochloride (PHMB) using a lactone-rhodamine B (L-RB) based fluorescence optode has been developed. The optode membrane consists of 2-nitrophenyl octyl ether as a plasticizer, L-RB, and poly (vinyl chloride). The optode responds to tetrakis (4-fluorophenyl) borate, sodium salt (NaTPBF) in the μM range. The fluorescence intensity of the L-RB film for PHMB solution containing 20 μM NaTPBF decreased linearly as the concentration of the PHMB solution increased in the concentration range from 0 to 8.0 μM, which shows that PHMB with a concentration range of 0 to 8.0 μM is determined by the L-RB film optode. The concentration of PHMB in the contact lens detergents by the proposed method was in accord with its nominal concentration.


2018 ◽  
Vol 42 (4) ◽  
pp. 2590-2604 ◽  
Author(s):  
Seyed Alireza Shahamirifard ◽  
Mehrorang Ghaedi

A selective, accurate and highly sensitive optical chemical sensor (optode) for the simultaneous determination of copper(ii) and cobalt(ii) without any prior separation or purification ion sensing was developed.


2017 ◽  
Vol 82 (3) ◽  
pp. 317-328
Author(s):  
Homa Shafiekhani ◽  
Fahimeh Nezam ◽  
Shahriyar Bahar

This paper describes the development and creation of a new sensitive optical sensor that is quite selective to Hg(II) ions in aqueous solution. The sensing element, the newly synthesized methyl 2-[3-(3-methylphenyl)-2-triazen- 1-yl]benzoate, incorporated into a plasticized poly(vinyl chloride) membrane, is able to determine Hg(II) ion with a high selectivity over a wide dynamic range from 5.0?115.1 ?g L-1 at pH 7.5 with a lower detection limit of 0.67 ?g L-1. The response of the optode membrane to Hg(II) was fully reversible and revealed a very good selectivity towards Hg(II) ion from a wide variety of other metal ions in solution. The overall performance characteristics of the sensor were evaluated and good reversibility, wide dynamic range, long life span, long-term response stability and high reproducibility were found. The proposed optical sensor gives proper results in applications including direct determination of the Hg(II) ion in real environmental samples.


2016 ◽  
Vol 26 (6) ◽  
pp. 1927-1938 ◽  
Author(s):  
Ayman A. Abdel Aziz ◽  
Rania G. Mohamed ◽  
Fatma M. Elantabli ◽  
Samir M. El-Medani

The Analyst ◽  
2015 ◽  
Vol 140 (1) ◽  
pp. 190-196 ◽  
Author(s):  
Jill L. Worlinsky ◽  
Steven Halepas ◽  
Masoud Ghandehari ◽  
Gamal Khalil ◽  
Christian Brückner

The known optical high pH sensing chromophores, free base and metal complexes (M = 2H, Zn(ii), Pt(ii)) of meso-tetrakis(pentafluorophenyl)porpholactone, and the as yet untested Ga(iii) complex, were made freely water-soluble by derivatization at the aryl group with PEG chains.


RSC Advances ◽  
2015 ◽  
Vol 5 (112) ◽  
pp. 92061-92070 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Moslem Mohammadi ◽  
Avat (Arman) Taherpour ◽  
Alessandra Garau ◽  
Vito Lippolis

A highly sensitive and selective fluorimetric optode membrane based on the enhancement in fluorescence emission of 5-(9-anthracenylmethyl)-5-aza-2,8-dithia[9],(2,9)-1,10-phenanthrolinophane (L) for subnanomolar detection of uranyl ion is presented.


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