Damrongsak, Pattareeya

Preferred name

Alternative Name

Damrongsak, P.

Main Affiliation

School of Science

pattareeya.da@kmitl.ac.th

Now showing 1 - 10 of 11

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Rhodamine 6G and Au–Pd core–shell nanorods: Fluorescence enhancement for detection of mercury
(2018-01-01)
Rammarat, Ekkachai
;
Kraithong, Sasiwimon
;
Wanichacheva, Nantanit
;
Swanglap, Pattanawit
;
Yindeesuk, Witoon
We show that hybrid organic–inorganic particles are efficient for accurate sensing of mercury ions and following up trace amounts of the mercury pollutions spread in the environment. The process of synthesis of a working substance starts from preparation of rhodamine 6G derivative. Then the dye molecules are bound on the surface of Au–Pd core–shell nanorods. Mercury ions with different concentrations are finally attached onto this fluorescence sensor. Fluorescence emission of the sensor is detected with a luminescence spectrophotometer. The experimental results demonstrate that the fluorescence intensity of one of our sensors, a sensor B, is remarkably enhanced when the mercury-ion concentration increases from 0 to 15.5 µM. The limit of detection of the ions is as low as 20.6 nM. The working mechanism of our fluorescence sensor can be explained through the fluorescence-energy transfer and the plasmonic effect associated with spirolactam forms of rhodamine and conducting bimetallic nanoparticles.
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Enhancement of fluorescence in inorganic dyes by metallic nanostructured surfaces
(2016-01-01)
Locharoenrat, Kitsakorn
;
Damrongsak, Pattareeya
We have studied the influence of shape and chemical content of metallic nanostructures (gold-palladium core-shell nanorods, gold nanobipyramids and single-crystalline porous palladium nanocrystals) on the luminescence of Rhodamine 6G and Coumarin153 dyes. The changes found in the emission intensity are attributed to different proportions of the dyes and the metallic nanostructures. The enhancement of the fluorescence observed by us for the cases of Rhodamine 6G with gold-palladium core-shell nanorods and Rhodamine 6G with gold nanobipyramids suggests their promising plasmonic properties. This may be regarded as a preliminary step towards development of the fluorescent probes possessing high photo-sensitivity.
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Effects of gold nanoparticles on fluorescence polarization and emission spectra of rhodamine 6G solution
(2018-01-01)
Damrongsak, Pattareeya
;
Rammarat, Ekkachai
;
Locharoenrat, Kitsakorn
Fluorescence polarization and emission spectra of Rhodamine 6G solution with gold nanoparticles have been studied. It is found that the emission intensities tend to be low when the gold nanoparticles are added into the solution partly due to the energy transfer from the Rhodamine 6G to gold nanoparticles. The fluorescence polarization increases as the concentration ratio of the gold and Rhodamine 6G is more than 124 and decreases as the ratio is about 1115. The enhancement and reduction of fluorescence polarization values are understood as the shortening of the fluorescence lifetime and a temperature effect from the heating of gold nanoparticles, respectively.
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Optical imaging of artificial latent fingerprints using rhodamine 6G and au-core/Pd-shell nanorods
(2019-01-01)
Locharoenrat, Kitsakorn
;
Damrongsak, Pattareeya
Latent fingerprints represent valuable information-storage platforms, which play a key role in the forensic practice and health assessment. Recent works have explored novel image-enhancement methods in latent fingerprinting, which are associated with fluorescence dyes. In this study we improve the quality of fingerprint images, using a combination of fluorescence dyes and bimetallic nanoparticles. We find that Rhodamine 6G can serve as a kind of ‘glue’ adhering well onto Au–Pd core–shell nanorods. This system which employs molecules like α- amylase can be successfully used for recognition of artificial latent fingerprints. The appropriate mechanism can be coupling of localized surface plasmon resonance in the nanorods mentioned above and the emission of Rhodamine 6G. As a result, we observe notable enhancement of the images of artificial latent fingerprints.
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Antitumor activities of carboplatin–doxorubicin–ZnO complexes in different human cancer cell lines (breast, cervix uteri, colon, liver and oral) under UV exposition
(2021-01-01)
Pairoj, Suttirak
;
Damrongsak, Pattareeya
;
Damrongsak, Badin
;
Jinawath, Natini
;
Kaewkhaw, Rossukon
This study aimed to examine the pharmacological profiles of multiple chemo drug candidates in systematic circulation to enhance their specific interactions with five human cancer cell lines. ZnO nanoparticles were successfully bound with chemo drugs via physical adsorption. The drug loading capacity was confirmed by FTIR, whereas the loading efficiency was determined via UV–vis spectrometry. The mean hydrodynamic size increased to 69–82 nm after chemo-drug immobilization via non-covalent interaction with ZnO. Among the nine formulated chemo drugs, the carboplatin (CP)–doxorubicin (DOX)–ZnO complex under UV light irradiation exhibited high sensitivity towards human breast adenocarcinoma cells without affecting human keratinocyte immortal cells with an IC<inf>50</inf> of 0.137 µg/mL, whereas the loading capacity and efficiency of CP–DOX–ZnO were 77.81% and 99.05%, respectively. Fluorescence images confirmed that CP–DOX–ZnO using DOX served as a fluorescence enhancer specifically bound onto the cell membranes, which became almost saturated after 24 h incubation. Carboplatin–DOX–ZnO was possibly endocytosed by cancer cells and was selectively internalized into the target cells; thus, free chemo drug was released in the cytoplasm, which induced acute apoptosis. This resulted in complete inhabitation of growth signal of target cancer cells.
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Kinetics of dye removal using Fe3O4 nanoparticles and pulsed white-LED illumination
(2019-01-01)
Damrongsak, Pattareeya
;
Klongratog, Bhanupol
;
Hoomsuk, Sirichai
;
Locharoenrat, Kitsakorn
Removal of dyes with the aid of photocatalytic nanomaterials illuminated with continuous-light sources has been given substantial attention in the recent years. In the present work we study the efficiency of dye degradation using some alternative photocatalytic nanoparticles under condition of pulsed illumination. Our specific purpose is to investigate the removal of rhodamine 6G dye basing on suspended Fe<inf>3</inf>O<inf>4</inf> solution. The experiments are carried out in the batch mode when the effect of the exposition time (ranging from 30 to 150 min) on the dye removal is examined under both continuous and pulsed white-LED illuminations. Different pulsed-light frequencies and duty cycles are tested. We estimate the concentration of rhodamine 6G in the mixed solution following from its absorption spectrum measured with a UV-Vis spectrometer and determine in this manner the percentage of dye removal. Our main conclusion is that Fe<inf>3</inf>O<inf>4</inf> nanoparticles enable removing efficiently the rhodamine 6G dye under pulsed white-LED illumination. In particular, more than 90% of the dye is removed when the duty cycle is equal to 25% and the frequency to 30 kHz. The equilibrium state of this process is achieved in about 60 min.
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Effect of Adsorption Characteristics of Rhodamine 6G Dye Solution in Fe3O4 Magnetic Nanoparticles on Fluorescence Quantum Yield
(2019-01-01)
Phoemphoonthanyakit, Suwaphit
;
Seeharaj, Panpailin
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Damrongsak, Pattareeya
;
Locharoenrat, Kitsakorn
In this work, the use of Fe<inf>3</inf>O<inf>4</inf> magnetic nanoparticles in the adsorption of rhodamine 6G solution was evaluated via absorbance and fluorescence spectroscopy using the UV-Vis spectrometer. The adsorption mechanism of rhodamine 6G on Fe<inf>3</inf>O<inf>4</inf> was determined with respect to the adsorbent dosage (2.5-10 mg/L) and treatment time (0-150 min). The experimental data revealed that the fluorescence quantum yield of rhodamine 6G was inversely proportional to the percentage of dye removal. The highest efficiency of dye removal was obtained at 10 mg/L Fe<inf>3</inf>O<inf>4</inf>, and the adsorption capacity was about 150 mg/g, together with a reduced treatment time of 30 min, owing to active adsorption of Fe<inf>3</inf>O<inf>4</inf>. We believe that our study makes a significant contribution to the literature because Fe<inf>3</inf>O<inf>4</inf> magnetic nanoparticles were found to be able to quench rhodamine 6G dye molecules, which will aid in eliminating toxic and hazardous pollutants from dye wastewater, which are otherwise detrimental to the environment and human health.
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Optical performance of fluorescent collectors integrated with microlens arrays
(2017-09-01)
Damrongsak, Pattareeya
;
Locharoenrat, Kitsakorn
Fluorescent collectors have been considered for being used as a light concentrator in photovoltaic applications. It is able to replace the expensive area of solar cells in order to minimize the energy cost. In this study, fluorescent collectors integrated with microlens arrays were developed in order to improve the collection efficiency. Fluorescent collectors were prepared by casting an epoxy resin solution containing Rhodamine 6G dye in the polydimethylsiloxane master mold. Polydimethylsiloxane-based microlens arrays with actual diameters of 804.06-1008.02 μm were fabricated using a replica molding technique. The microlens arrays were then integrated with the fluorescent collectors with various dye concentrations from 2.5 × 10<inf>-4</inf> to 4.5 × 10<inf>-4</inf> Molar. Experimental results were demonstrated that the implementation of polydimethylsiloxane microlens arrays on the top of fluorescent collectors was improved for both light absorption and fluorescent intensity.
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Studies of concentration dependence of the fluorescent quantum yield from rhodamine 6G and Au–Pd core–shell nanorods, using a response surface methodology
(2017-01-01)
Rammarat, Ekkachai
;
Locharoenrat, Kitsakorn
;
Yindeesuk, Witoon
;
Damrongsak, Pattareeya
We have applied a response surface approach to study the fluorescence quantum yield (FQY) of rhodamine 6G (Rh6G) mixed with Au–Pd core–shell nanorods (Au–Pd NRs). The FQYs have been measured for the Rh6G concentrations varying from 3.53×10–7 to 1.70×10–6 mol/L and the concentrations of Au–Pd NRs from 7.06×10–6 to 1.36×10–4 mol/L. Our experimental results testify that the FQY depends notably on the proportions of Rh6G and Au–Pd NRs. A specific relationship between the FQY and the concentrations has also been confirmed by a response surface plot. It is found that the discrepancy between the experiment and the calculations is less than 2%.
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Antiradical properties of chemo drug, carboplatin, in cooperation with ZnO nanoparticles under UV irradiation in putative model of cancer cells
(2019-07-01)
Pairoj, Suttirak
;
Damrongsak, Pattareeya
;
Damrongsak, Badin
;
Jinawath, Natini
;
Kaewkhaw, Rossukon
The main objective of this study was to assess the antiradical properties of zinc oxide (ZnO) nanoparticles upon exposure to ultraviolet radiation with carboplatin, an anti-proliferative drug used in the treatment of retinoblastoma. For the purpose of this study, the decomposition of 2,2(diphenyl-1-picryhydrazyl) radical (DPPH*) was used to assess the free radical capacity of antioxidants and was followed by MTT measurements. To test the antiradical capacity, the effective concentration, antiradical power, stoichiometry, and number of reduced DPPH* were investigated. DPPH* has a peak absorbance at a wavelength of 515 nm, which disappears upon the introduction of the antiradical agents. Four agents were reacted with DPPH* and represented the possible reaction kinetic categories. ZnO nanoparticles and carboplatin-loaded ZnO nanoparticles reacted more strongly with DPPH* and approached a saturation state at 420 min. The remaining two antiradical agents, ZnO nanoparticles under UV radiation and carboplatin-loaded ZnO nanoparticles under UV radiation, reacted a bit slower with DPPH* and approached a steady state at 1440 min. Among the different four antiradical agents, carboplatin-loaded ZnO nanoparticles under UV light had the highest antiradical response with the lowest effective concentration value to the reduced DPPH* molecules. ZnO nanoparticles alone were found to be poor antiradical agent. Possible mechanisms were attributed to the number of hydroxyl groups available to decrease the number of DPPH*.
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Damrongsak, Pattareeya

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