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Lat Bua Luang, Thailand

Puangploy P.,King Mongkuts University of Technology Thonburi | Smanmoo S.,Bioresources Research Unit | Surareungchai W.,King Mongkuts University of Technology Thonburi
Sensors and Actuators, B: Chemical | Year: 2014

A new rhodamine derivative (R1) has been synthesized by a hydrazone formation of rhodamine B hydrazide with pyrrole-2-carboxaldehyde and its binding affinity to metal ions were examined. R1 shows highly binding selectivity to Cu2+ over commonly coexistent metal ions in neutral aqueous-organic media including alkali, alkaline-earth and transition metals. The linear response to Cu2+ was obtained across the concentration range of 0.4-10 μM with the detection limit of 280 nM. Using newly synthesized probe R1, determination of Cu2+ concentration in drinking water and serums, and living cell imaging of Cu2+ were carried out. Also, by incorporating the R1 with filter paper, the sensor was performed in Cu 2+ spiked samples. © 2013 Elsevier B.V.

Smanmoo S.,Bioresources Research Unit | Kawasaki S.,Nagasaki University | Tangboriboonrat P.,Mahidol University | Shibata T.,Nagasaki University | And 2 more authors.
Journal of Fluorescence | Year: 2013

Diimine ligand (DL) 1 significantly exhibited the fluorescence quenching upon binding to guanine. Changing at the para-substituent of the phenyl ring from the hydroxyl to bromo groups reversely enhanced the fluorescence in the presence of guanine. The reverse in the fluorescence selectivity indicated the profound effect of the substituent at the para-position of the phenyl ring. The simple synthesis of DL 1 and DL 2 with good selectivity for guanine offers these DLs as promising compounds for chemosensors of other guanine derivatives. [Figure not available: see fulltext.] © 2013 Springer Science+Business Media New York.

Kaewsaneha C.,Mahidol University | Opaprakasit P.,Thammasat University | Polpanich D.,National Nanotechnology Center | Smanmoo S.,Bioresources Research Unit | Tangboriboonrat P.,Mahidol University
Journal of Colloid and Interface Science | Year: 2012

The nanoparticle with simultaneous combination of magnetic and fluorescent properties was prepared by immobilization of fluorescein isothiocyanate (FITC) onto magnetic polymeric nanoparticle (MPNP). The MPNP with 41% magnetic content was obtained from incorporating Fe 3O 4 magnetic nanoparticles (MNPs) into poly(styrene/divinyl benzene/acrylic acid) via the miniemulsion polymerization. Before labeling with FITC, the carboxylated MPNP was coated with chitosan (CS) having low, medium, or high molecular weight (MW) in order to avoid quenching of the fluorescent by iron oxide. Data obtained from TEM, size and zeta potential measurements clearly indicated the presence of CS as a shell surrounding the superparamagnetic MPNP core. The zeta potential, FTIR, and fluorescent spectroscopies confirmed the attachment of FITC to the MPNP-CS via covalent bonding. The higher MW or longer chains of CS (300kDa) offered the larger spacer with multiple sites for the FITC binding and, thus, provided the higher fluorescent emission intensity. The MPNP-CS immobilized with FITC would be useful for cell-labeling application. © 2012 Elsevier Inc..

Smanmoo S.,Bioresources Research Unit | Nasomphan W.,Mahidol University | Tangboriboonrat P.,Mahidol University
Inorganic Chemistry Communications | Year: 2011

2-Hydroxybenzyl dansyl cadaverine (DNSCH) was designed as a fluorescent chemosensor for Fe3+. DNSCH exhibited significant FL quenching with increasing concentrations of Fe3+. The presence of 15 M equiv of Fe3+ significantly quenched the FL intensity of DNSCH. The binding constant of DNSCH towards Fe3+ was determined and found to be 1.5 ± 0.4 × 10-4 M-1. DNSCH was employed as an intracellular chemosensor for Fe3+. © 2010 Elsevier B.V. All rights reserved.

Smanmoo S.,Bioresources Research Unit | Nasomphan W.,Mahidol University | Tangboriboonrat P.,Mahidol University
Chemistry Letters | Year: 2011

Isothiocyanatoluminol (ITL) was successfully synthesized from the reaction between luminol and thiophosgene in the presence of triethylamine. The optimized conditions were extended for the preparation of isothiocyanatoisoluminol (ITIL) and phenyl isothiocyanate (PI). The chemiluminescence (CL) of ITL was comparable to luminol. ITL was used as a CL labeling reagent for amino acid and bovine serum albumin (BSA) in which the -NH2 terminus of amino acid residue present in BSA acts as the labeling site. © 2011 The Chemical Society of Japan.

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