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Hong Dinh Duong,김주연,Jong Il Rhee 한국센서학회 2024 센서학회지 Vol.33 No.2
In this study, a fluorescent ethanol sensor is developed to determine the ethanol concentration in the liquid phase. The sensor is developed using a complex of resazurin (RA)/resorufin (RO) and a hydrotalcite (HT) catalyst in a sol-gel matrix of methyltrimethoxysilane (MTMS) to produce a fluorescent ethanol-sensing membrane (RA/RO*HT membrane). The operation mechanism of the RA/RO*HT membrane is based on (i) the oxidation of ethanol to acetaldehyde and (ii) the reduction of RA to RO, through electron flows followed by EtOH ↔ HT ↔ RA/RO ↔ EtOH interactions. These possible redox reactions can lead to an increased fluorescence intensity of the RA/RO*HT membrane as the ethanol concentration increases. The RA/RO*HT membrane shows a linear detection range of 1–20 vol.% EtOH with limit of detection (LOD) of 0.178%. Additionally, the RA/RO*HT membrane has high sensitivity and accuracy for determining the alcohol content in several Korean alcoholic beverages.
Hong Dinh Duong,이종일 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Sol–gel matrix GA was produced by hydrolyzing and polymerizing amixture of GPTMS and APTMS. Sol–gel GA was used to entrap CdSe/ZnS quantum dots (QDs) to fabricate a QD-entrapped sol–gel membrane. The electronic energy transfer from the sol–gel GA membrane and QDs to protoporphyrin IX (PpIX) led toan increase in the energy absorption of PpIX. The QD-entrapped sol–gel membrane was used forquantification of PpIX in aqueous solution with a linear detection range of 1–50 mM, and the sensitivityincreased by about 25–44%, relative to that of the QD probes.
Dinh Duong, Hong,Il Rhee, Jong Elsevier 2015 Talanta Vol.134 No.-
<P><B>Abstract</B></P> <P>In this work, the oxazine 170 perchlorate (O17)-ethyl cellulose (EC) membrane was successfully applied in the fabrication of a urea-sensing membrane. The urea-sensing membrane was a double layer consisting of the O17-EC membrane and a layer of the enzyme urease entrapped into EC matrix. The sensing principle of urea was based on the hydrolysis reaction of urea under the catalysis of the urease to produce ammonia in water and also on the binding of ammonia with the dye O17 to create the shift in the emission wavelength from <I>λ</I> <SUB> <I>em</I> </SUB>=630nm to <I>λ</I> <SUB> <I>em</I> </SUB>=565nm. The data collected from the ratio of the fluorescence intensities at <I>λ</I> <SUB> <I>em</I> </SUB>=630nm and <I>λ</I> <SUB> <I>em</I> </SUB>=565nm was proportional to urea concentration. The urea-sensing membrane with the ratiometric method was used to measure the concentrations of urea in the range of 0.01–0.1M with a limit of detection (LOD) of 0.027mM and 0.1–1.0M with LOD of 0.224mM. It showed fast response time, high reversibility and long-term stability in this concentration range. The recovery percentage of urea concentrations of the urea-sensing membrane for two kinds of biological urine solutions (BU1, BU2) was around 85–118%. The measured results were in good agreement with standard urea concentrations in the range of 0.06M to 1.0M.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fabrication of a urea-sensing membrane based on the O17-EC membrane. </LI> <LI> Immobilization of the enzyme urease onto the O17-EC membrane. </LI> <LI> Detection of urea with the ratiometric fluorescence method. </LI> <LI> Application of the urea sensor to the determination of urea in urine solutions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>