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Kamruzzaman, Mohammad,Alam, Al-Mahmnur,Kim, Kyung Min,Lee, Sang Hak,Suh, Yeoun Suk,Kim, Young Ho,Kim, Sung Hong,Oh, Sang Hyub American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>We present the enhancement of luminescence of europium complex, Eu(3+)-ciprofloxacin (CIP), in the presence of silver nanoparticles (Ag NPs) for the CIP determination. The increment of the luminescence intensity of the Eu(3+)-CIP complex with Ag NPs was obtained due to the transfer of resonance energy to the fluorophores through the interaction of the excited-state fluorophores and surface plasmon electron in the metal nano surface. The luminescence intensity of Eu3+ was enhanced by complexation with CIP at 614 nm after excitation at 373 nm corresponding to the 5D0-7F2 transitions of Eu3+ ion. Based on the above phenomenon, a sensitive and rapid spectrofluorimetric method has been developed for the CIP determination. Linearity of the calibration curve was obtained in the range of 2.0 x 10(-10)-1.0 x 10(-8) g mL(-1) with correlation coefficient of 0.9992. The limit of detection of CIP was found to be 1.9 x 10(-11) g mL(-1) with the relative standard deviation (RSD) of 1.19% for 5 replicate measurements of 5.0 x 10(-7) g mL(-1) of CIP. The present method has been successfully applied for CIP determination in pharmaceutical and biological samples.</P>
Kamruzzaman, Mohammad,Alam, Al-Mahmnur,Kim, Kyung Min,Lee, Sang Hak,Kim, Young Ho,Kabir, A N M Hamidul,Kim, Gyu-Man,Dang, Trung Dung Kluwer Academic Publishers 2013 Biomedical microdevices Vol.15 No.1
<P>A rapid and sensitive chemiluminescence (CL) system coupled with a microfluidic chip has been presented to determine vitamin B12 (VB12) based on the reaction of luminol and silver nitrate (AgNO(3)) in the presence of gold nanoparticles (AuNPs). A microfluidic chip was fabricated by a soft-lithographic procedure using polydimethyl siloxane (PDMS) having four inlets and one outlet with a 200?μm wide, 250?μm deep, and 100?mm long microchannel. Ag(+) was used as a chemiluminogenic oxidant in this CL reaction which oxidized luminol to produce strong CL signal in the presence of AuNPs. Luminol reacted with AgNO(3) under the catalysis of AuNPs to produce luminol radicals which reacted with dissolved oxygen and emitted CL light. The proposed CL system was applied to determine the amount of VB12 in VB12 tablets and multivitamin. Under the optimum conditions, the CL intensity of the system was increased with the concentration of VB12 in the range of 0.25-100?ng mL(-1) with the correlation coefficient of 0.9982. The limit of detection was found to be 0.04?ng mL(-1) with the relative standard deviation of 1.56?% for five replicate determinations of 25?ng mL(-1) of VB12. The CL reaction mechanism was demonstrated by UV-visible spectra and CL emission spectra.</P>
Mohammad Kamruzzaman,Taslima Ferdous,이상학,Al-Mahmnur Alam,So Yeun Kim,Young Ho Kim,김성홍 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
A simple and highly sensitive chemiluminescence method to determine norfloxacin (NFLX) has been proposed by measuring the chemiluminescence (CL) intensities using a flow injection (FI) system. The CL intensity of the luminol- H_2O_2 system is strongly enhanced by the addition of Cu (II) in alkaline condition. The CL intensity is substantially increased after the injection of NFLX into the luminol-H_2O_2-Cu (II) system. The enhancement effect is attributed to a catalytic effect of Cu (II) due to the interaction with NFLX which forms a complex with the catalyst. Under the optimal conditions, the sensitizing effect of the CL intensity is proportional to the concentration of NFLX in the range of 1.5 ×10^(‒9) - 5.9 × 10^(‒7) mol L^(‒1) (r = 0.9994) with a detection limit (3σ) of 2.98 × 10^(‒10) mol L^(‒1). The proposed method had good reproducibility with the relative standard deviation (RSD, n = 5) of 1.6% for 1 × 10‒7 mol L−1 of NFLX. The possible reaction mechanism of the CL reaction is also discussed. This method has been successfully applied for the determination of trace amount of NFLX in pharmaceutical preparations and serum samples.
은나노입자를 사용한 Luminol 기반 화학발광 시스템에 의한 Gatifloxacin 정량
( Mohammad Kamruzzaman ),( Al Mahmnur Alam ),이상학 ( Sang Hak Lee ),김소연 ( So Yeon Kim ),조해진 ( Hae Jin Jo ),김영호 ( Young Ho Kim ) 한국공업화학회 2010 응용화학 Vol.14 No.2
A sensitive chemiluminescence method coupled with flow-injection has been proposed for the determination of gatifloxacin based on the reaction with luminol and hydrogen peroxide catalyzed by silver nanoparticles (Ag NPs). Therefore, the application of luminol-H(2)O(2)-Ag NPs system was exploited for the determination of gatifloxacin in the linear range of 1.2 × 10(-10) - 4.4 × 10(-8) g mL(-1) with a detection limit of 1.17 × 10(-11) g mL(-1). The proposed method offers high sensitivity, wide linear range and good stability which can be successfully applied to the determination of gatifloxacin in pharmaceutical preparations and human urine.
금나노입자의 촉매 작용에 의한 Ce(4)와 Sodium Hyposulfite의 반응을 사용한 Folic Acid 정량을 위한 흐름주입 화학발광법
( Mohammad Kamruzzaman ),( Md R-mahmnur Alam ),김소연 ( So Yeon Kim ),조해진 ( Hae Jin Jo ),이상학 ( Sang Hak Lee ),김영호 ( Young Ho Kim ),김성홍 ( Sung Hong Kim ) 한국공업화학회 2011 응용화학 Vol.15 No.1
A rapid flow injection chemiluminescence method (CL-FIA) is proposed for the determination of folic acid (FA). The method is based on the intensified CL intensity of Ce(IV)-Na2S2O4-FA system catalyzed by gold nanoparticles (Au NPs). The CL intensity of the Ce(IV)-Na2S2O4-FA-Au NPs system was increased with the concentration of FA in the linear range of 2.3×10(-9)-8.5×10(-7) mol L(-1) with correlation coefficient of 0.9992. The limit of detection was found to be 2.7×10(-10) mol L(-1). The method affords good accuracy with high sensitivity and selectivity which can be applied successfully for the determination of folic acid in pharmaceutical and biological samples.
Terbium에 의해 증가된 분광형광분석법을 이용한 Dopamine 정량
( Mohammad Kamruzzaman ),( Al Mahmnur Alam ),이상학 ( Sang Hak Lee ),( Taslima Ferdous ),김영호 ( Young Ho Kim ) 한국공업화학회 2010 응용화학 Vol.14 No.2
A terbium-sensitized spectrofluorimetric method was developed for the determination of dopamine (DA) using an anionic surfactant, sodium dodecyl benzene sulfonate (SDBS). This method is based on the sensitized fluorescence of terbium (III) when excited in the presence of DA because a Tb (III)-DA complex is formed. A pronounced enhancement of intensity was observed when SDBS was added to the Tb (III)-DA complex. Under the optimum conditions, the present method showed good stability and reproducibility within the range of 2.5 × 10(-9) - 1.0 × 10(-7) mol L(-1) of DA with a detection limit of 7.5 × 10(-10) mol L(-1). Therefore, the proposed method was applied satisfactorily to the determination of dopamine in pharmaceutical preparations and serum sample.
Kamruzzaman, Mohammad,Alam, Al-Mahmnur,Lee, Sang-Hak,Kim, Young-Ho,Kim, Sung-Hong,Kim, Gyu-Man Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.1
A europium (III)-sensitized, spectrofluorimetric (FL) method is presented for the determination of sparfloxacin (SPAR) using an anionic surfactant, sodium dodecyl benzene sulphonate (SDBS). The method is based on the strong fluorescence (FL) enhancement of SPAR after the addition of $Eu^{3+}$ ions as fluorescence probes. The experimental results indicated that the FL intensity of the SPAR-$Eu^{3+}$ system was enhanced markedly by SDBS. The maximum FL emission signal was obtained at about 615 nm when excited at 372 nm. The experimental conditions that affected the FL intensity of the SPAR-$Eu^{3+}$-SDBS system were optimized systematically. The enhanced FL intensity of the system exhibited a good linear relationship with the SPAR concentration over the range of $1.5{\times}10^{-9}-1.2{\times}10^{-7}mol\;L^{-1}$ with a correlation coefficient (r) of 0.9987. The limit of detection ($3{\delta}$) was $4.15{\times}10^{-10}mol\;L^{-1}$ with a relative standard deviation (RSD) of 1.65%. This method was successfully applied for the determination of SPAR in pharmaceuticals, and human serum and urine samples with higher sensitivity, wide dynamic range and better stability. The possible interaction mechanism of the system is also discussed in detail by ultraviolet absorption spectra and FL spectra.
Kamruzzaman, Mohammad,Alam, Al-Mahmnur,Kim, Kyung Min,Lee, Sang Hak,Kim, Young Ho,Kim, Sung Hong Plenum Press ; Springer 2012 Journal of fluorescence Vol.22 No.3
<P>A simple and sensitive chemiluminescence (CL) method coupled with flow-injection technique is proposed to determine naproxen (NAP). The method is based upon the enhancement of the weak CL signal arising from the reaction of Ce(IV) and Na(2)S(2)O(4) with Eu(3+) to form the Eu(3+)-Ce(IV)-Na(2)S(2)O(4) system. The CL intensity was significantly increased by the introduction of NAP into this system in the presence of silver nanoparticles (Ag NPs). Examination of the recorded UV-vis spectra and fluorescence spectra indicated that the energy of the intermediate SO(2)*, which originated from the redox reaction of Ce(IV) and Na(2)S(2)O(4), was transferred to Eu(3+) via NAP and that the process was accelerated by Ag NPs due to their catalytic activity. Under the optimum conditions, the CL intensity was increased with increasing NAP concentration and the correlation was linear (r = 0.9992) over the NAP concentration range of 1-420 ng mL(-1). The limit of detection (LOD) was 0.11 ng mL(-1) with a relative standard deviation (RSD) of 1.15% for 5 replicate determinations of 200 ng mL(-1) NAP. The method was successfully applied to determine NAP in pharmaceutical and biological samples.</P>