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Papers by Mohammad Kamruzzaman

Research paper thumbnail of Spectrofluorimetric Analysis of Vitamin B1 in Pharmaceutical Preparations, Bio-fluid and Food Samples

Research paper thumbnail of Spectroscopic study of the interaction between adenosine disodium triphosphate and gatifloxacin-Al 3+ complex and its analytical application

Luminescence, 2015

A new and sensitive spectrofluorimetric method has been proposed to determine trace amount of ade... more A new and sensitive spectrofluorimetric method has been proposed to determine trace amount of adenosine disodium triphosphate (ATP). The method is based on the fluorimetric interaction between gatifloxacin (GFLX)-aluminium (III) (Al 3+) complex and ATP and studied using UV-visible and fluorescence spectroscopy. Weak luminescence spectra of Al 3+ were enhanced after complexation with GFLX at 423 nm upon excitation at 272 nm due to energy transfer from the ligand to the Al 3+ ion. It was observed that the FL emission spectrum of GFLX-Al 3+ was enhanced significantly by the addition of ATP. Under the optimal conditions, the enhancement of FL intensity at 423 nm was responded linearly with the concentration of ATP in the range 1.3 × 10-10-1.0 × 10-8 mol L-1 with correlation coefficient (r) of 0.9981. The limit of detection (LOD) was found to be 1.1 × 10-11 mol L-1 for ATP with the standard deviation (RSD) of 1.21% for five repeated measurement of 2.3 × 10-8 mol L-1 ATP. The presented method is simple, sensitive, free from coexisting interferents and can be applied successfully to determine ATP in the real samples.

Research paper thumbnail of Enhanced Luminescence of Lanthanide Complexes by Silver Nanoparticles for Ciprofloxacin Determination

Journal of Nanoscience and Nanotechnology, 2012

We present the enhancement of luminescence of europium complex, Eu 3+-ciprofloxacin (CIP), in the... more 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 Eu 3+ was enhanced by complexation with CIP at 614 nm after excitation at 373 nm corresponding to the 5 D 0-7 F 2 transitions of Eu 3+ 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 × 10 −10-1 0 × 10 −8 g mL −1 with correlation coefficient of 0.9992. The limit of detection of CIP was found to be 1 9 × 10 −11 g mL −1 with the relative standard deviation (RSD) of 1.19% for 5 replicate measurements of 5 0 × 10 −7 g mL −1 of CIP. The present method has been successfully applied for CIP determination in pharmaceutical and biological samples.

Research paper thumbnail of Spectrofluorimetric quantification of bilirubin using yttrium–norfloxacin complex as a fluorescence probe in serum samples

Journal of Luminescence, 2012

A simple and sensitive spectrofluorimetric method was developed to determine trace amounts of bil... more A simple and sensitive spectrofluorimetric method was developed to determine trace amounts of bilirubin (BR) using yttrium (Y 3 þ)-norfloxacin (NFLX) complex as a fluorescence (FL) probe. NFLX can form a stable binary complex with Y 3 þ and markedly enhances the weak FL signal of the NFLX. The FL intensity of the Y 3 þ-NFLX complex decreased significantly in the presence of BR in a buffer solution at pH ¼ 7.2. Under optimal conditions, the FL intensity decreased according to the BR concentration and showed a good linear relationship in the range of 0.03-2.3 mg mL À 1 of BR with a correlation coefficient of 0.9988. The limit of detection for the determination of BR was 2.8 ng mL À 1 with a relative standard deviation (RSD) of 1.55% for five replicate determination of 0.05 mg mL-1 BR. The presented method offers higher sensitivity with simple instrumentation and was applied successfully in detecting BR at low concentrations.

Research paper thumbnail of Ultrasensitive Study of Gatifloxacin Based on Its Enhancing Effect on the Cerium (IV)-Sodium Hyposulfite Chemiluminescence Reaction in a Micellar Medium

Journal of Fluorescence, 2011

A sensitive and rapid flow-injection chemiluminescence (CL) method has been developed for the det... more A sensitive and rapid flow-injection chemiluminescence (CL) method has been developed for the determination of gatifloxacin in pharmaceutical preparations and biological samples. The method is based on the enhancing effect of gatifloxacin on CL emission generated by the interaction of Ce (IV) in sulphuric acid and sodium hyposulphite (Na(2)S(2)O(4)) sensitized by sodium dodecyl benzene sulfonate (SDBS). Strong CL emission was observed when gatifloxacin was injected into the Ce (IV) in sulphuric acid and Na(2)S(2)O(4) solution incorporated with SDBS in a flow-cell. Several experimental parameters affecting the CL reaction were investigated and optimized systematically. Under the optimum conditions, it was found that the CL intensity is proportional to the concentration of gatifloxacin in the range of 1.12 × 10(-11)-4.40 × 10(-9) g mL(-1) with a co-relation coefficient of 0.9994. The limit of detection was found to be 4.87 × 10(-12) g mL(-1) and the relative standard deviation (RSD, n=7) was 1.8% for 4 × 10(-8) g mL(-1) of GFLX. The proposed method offers higher sensitivity, wide linear range and better stability without requiring sophisticated instrumentation. Thus, the proposed method has been successfully applied to the determination of gatifloxacin in pharmaceuticals, serum and human urine.

Research paper thumbnail of Microfluidic chip based chemiluminescence detection of L-phenylalanine in pharmaceutical and soft drinks

Food Chemistry, 2012

A sensitive chemiluminescence (CL) method on chip coupled with microfluidic system has been repor... more A sensitive chemiluminescence (CL) method on chip coupled with microfluidic system has been reported for the determination of L-phenylalanine (L-PA). A microfluidic chip device with the detection chamber capable of fast sensing light emitted from the luminol and hydrogen peroxide CL reaction catalyzed by copper sulphate was fabricated for the determination of L-PA. The microfluidic chip was fabricated by a soft-lithographic procedure using polydimethyl siloxane (PDMS). The fabricated PDMS microfluidic chip had four inlet microchannels for introducing the sample, chemiluminescent reagent, Cu(II), and oxidant, and a 500 lm wide, 250 lm deep, and 82 mm long microchannel. The detection was based on the enhancement effect of L-PA on the CL signals of luminol-H 2 O 2-Cu 2+ system in an alkaline medium. The CL intensity of the system was enhanced linearly with the concentration of L-PA in the range of 1.5 Â 10 À9-1.2 Â 10 À7 mol L À1. The limit of detection was found to be 2.4 Â 10 À10 mol L À1 with the relative standard deviation of 1.8%. The presented method offers a simple, rapid and easy to handle analytical technique in terms of sensitivity, dynamic range and low detection limit for the determination of L-PA in diet soft drinks and pharmaceutical injection samples.

Research paper thumbnail of Enzymeless determination of total sugar by luminol–tetrachloroaurate chemiluminescence on chip to analyze food samples

Analytical and Bioanalytical Chemistry, 2012

Research paper thumbnail of Silver Nanoparticle-Enhanced Chemiluminescence Method for Determining Naproxen Based on Europium(III)-Sensitized Ce(IV)-Na2S2O4 Reaction

Journal of Fluorescence, 2012

We report on a simple and sensitive chemiluminescence (CL) method to determine nitrazepam. This m... more We report on a simple and sensitive chemiluminescence (CL) method to determine nitrazepam. This method is based on the fact that rhodamine 6G (Rh6G) enhanced the weak CL emission of the reaction of hexacyanoferrate with nitrazepam, and that it was further enhanced by silver nanoparticles (AgNPs). The effects of the concentrations of K3Fe(CN)6, Rh6G, AgNPs and NaOH on the CL reaction were investigated. Under the optimum conditions, the CL intensity was proportional to the concentration of nitrazepam in the range from 1.0 nM to 10.0 μM. The detection limit (3σ) was at 0.1 nM. The relative standard deviation was 2.1% (at a 0.1 μM concentration and for n = 11). The method was successfully applied to the determination of nitrazepam in Coca-Cola beverage, urine and plasma, and the recovery was 98-103%. We also considered the possible CL reaction mechanism.

Research paper thumbnail of Spectrofluorimetric Analysis of Vitamin B1 in Pharmaceutical Preparations, Bio-fluid and Food Samples

Research paper thumbnail of Spectroscopic study of the interaction between adenosine disodium triphosphate and gatifloxacin-Al 3+ complex and its analytical application

Luminescence, 2015

A new and sensitive spectrofluorimetric method has been proposed to determine trace amount of ade... more A new and sensitive spectrofluorimetric method has been proposed to determine trace amount of adenosine disodium triphosphate (ATP). The method is based on the fluorimetric interaction between gatifloxacin (GFLX)-aluminium (III) (Al 3+) complex and ATP and studied using UV-visible and fluorescence spectroscopy. Weak luminescence spectra of Al 3+ were enhanced after complexation with GFLX at 423 nm upon excitation at 272 nm due to energy transfer from the ligand to the Al 3+ ion. It was observed that the FL emission spectrum of GFLX-Al 3+ was enhanced significantly by the addition of ATP. Under the optimal conditions, the enhancement of FL intensity at 423 nm was responded linearly with the concentration of ATP in the range 1.3 × 10-10-1.0 × 10-8 mol L-1 with correlation coefficient (r) of 0.9981. The limit of detection (LOD) was found to be 1.1 × 10-11 mol L-1 for ATP with the standard deviation (RSD) of 1.21% for five repeated measurement of 2.3 × 10-8 mol L-1 ATP. The presented method is simple, sensitive, free from coexisting interferents and can be applied successfully to determine ATP in the real samples.

Research paper thumbnail of Enhanced Luminescence of Lanthanide Complexes by Silver Nanoparticles for Ciprofloxacin Determination

Journal of Nanoscience and Nanotechnology, 2012

We present the enhancement of luminescence of europium complex, Eu 3+-ciprofloxacin (CIP), in the... more 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 Eu 3+ was enhanced by complexation with CIP at 614 nm after excitation at 373 nm corresponding to the 5 D 0-7 F 2 transitions of Eu 3+ 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 × 10 −10-1 0 × 10 −8 g mL −1 with correlation coefficient of 0.9992. The limit of detection of CIP was found to be 1 9 × 10 −11 g mL −1 with the relative standard deviation (RSD) of 1.19% for 5 replicate measurements of 5 0 × 10 −7 g mL −1 of CIP. The present method has been successfully applied for CIP determination in pharmaceutical and biological samples.

Research paper thumbnail of Spectrofluorimetric quantification of bilirubin using yttrium–norfloxacin complex as a fluorescence probe in serum samples

Journal of Luminescence, 2012

A simple and sensitive spectrofluorimetric method was developed to determine trace amounts of bil... more A simple and sensitive spectrofluorimetric method was developed to determine trace amounts of bilirubin (BR) using yttrium (Y 3 þ)-norfloxacin (NFLX) complex as a fluorescence (FL) probe. NFLX can form a stable binary complex with Y 3 þ and markedly enhances the weak FL signal of the NFLX. The FL intensity of the Y 3 þ-NFLX complex decreased significantly in the presence of BR in a buffer solution at pH ¼ 7.2. Under optimal conditions, the FL intensity decreased according to the BR concentration and showed a good linear relationship in the range of 0.03-2.3 mg mL À 1 of BR with a correlation coefficient of 0.9988. The limit of detection for the determination of BR was 2.8 ng mL À 1 with a relative standard deviation (RSD) of 1.55% for five replicate determination of 0.05 mg mL-1 BR. The presented method offers higher sensitivity with simple instrumentation and was applied successfully in detecting BR at low concentrations.

Research paper thumbnail of Ultrasensitive Study of Gatifloxacin Based on Its Enhancing Effect on the Cerium (IV)-Sodium Hyposulfite Chemiluminescence Reaction in a Micellar Medium

Journal of Fluorescence, 2011

A sensitive and rapid flow-injection chemiluminescence (CL) method has been developed for the det... more A sensitive and rapid flow-injection chemiluminescence (CL) method has been developed for the determination of gatifloxacin in pharmaceutical preparations and biological samples. The method is based on the enhancing effect of gatifloxacin on CL emission generated by the interaction of Ce (IV) in sulphuric acid and sodium hyposulphite (Na(2)S(2)O(4)) sensitized by sodium dodecyl benzene sulfonate (SDBS). Strong CL emission was observed when gatifloxacin was injected into the Ce (IV) in sulphuric acid and Na(2)S(2)O(4) solution incorporated with SDBS in a flow-cell. Several experimental parameters affecting the CL reaction were investigated and optimized systematically. Under the optimum conditions, it was found that the CL intensity is proportional to the concentration of gatifloxacin in the range of 1.12 × 10(-11)-4.40 × 10(-9) g mL(-1) with a co-relation coefficient of 0.9994. The limit of detection was found to be 4.87 × 10(-12) g mL(-1) and the relative standard deviation (RSD, n=7) was 1.8% for 4 × 10(-8) g mL(-1) of GFLX. The proposed method offers higher sensitivity, wide linear range and better stability without requiring sophisticated instrumentation. Thus, the proposed method has been successfully applied to the determination of gatifloxacin in pharmaceuticals, serum and human urine.

Research paper thumbnail of Microfluidic chip based chemiluminescence detection of L-phenylalanine in pharmaceutical and soft drinks

Food Chemistry, 2012

A sensitive chemiluminescence (CL) method on chip coupled with microfluidic system has been repor... more A sensitive chemiluminescence (CL) method on chip coupled with microfluidic system has been reported for the determination of L-phenylalanine (L-PA). A microfluidic chip device with the detection chamber capable of fast sensing light emitted from the luminol and hydrogen peroxide CL reaction catalyzed by copper sulphate was fabricated for the determination of L-PA. The microfluidic chip was fabricated by a soft-lithographic procedure using polydimethyl siloxane (PDMS). The fabricated PDMS microfluidic chip had four inlet microchannels for introducing the sample, chemiluminescent reagent, Cu(II), and oxidant, and a 500 lm wide, 250 lm deep, and 82 mm long microchannel. The detection was based on the enhancement effect of L-PA on the CL signals of luminol-H 2 O 2-Cu 2+ system in an alkaline medium. The CL intensity of the system was enhanced linearly with the concentration of L-PA in the range of 1.5 Â 10 À9-1.2 Â 10 À7 mol L À1. The limit of detection was found to be 2.4 Â 10 À10 mol L À1 with the relative standard deviation of 1.8%. The presented method offers a simple, rapid and easy to handle analytical technique in terms of sensitivity, dynamic range and low detection limit for the determination of L-PA in diet soft drinks and pharmaceutical injection samples.

Research paper thumbnail of Enzymeless determination of total sugar by luminol–tetrachloroaurate chemiluminescence on chip to analyze food samples

Analytical and Bioanalytical Chemistry, 2012

Research paper thumbnail of Silver Nanoparticle-Enhanced Chemiluminescence Method for Determining Naproxen Based on Europium(III)-Sensitized Ce(IV)-Na2S2O4 Reaction

Journal of Fluorescence, 2012

We report on a simple and sensitive chemiluminescence (CL) method to determine nitrazepam. This m... more We report on a simple and sensitive chemiluminescence (CL) method to determine nitrazepam. This method is based on the fact that rhodamine 6G (Rh6G) enhanced the weak CL emission of the reaction of hexacyanoferrate with nitrazepam, and that it was further enhanced by silver nanoparticles (AgNPs). The effects of the concentrations of K3Fe(CN)6, Rh6G, AgNPs and NaOH on the CL reaction were investigated. Under the optimum conditions, the CL intensity was proportional to the concentration of nitrazepam in the range from 1.0 nM to 10.0 μM. The detection limit (3σ) was at 0.1 nM. The relative standard deviation was 2.1% (at a 0.1 μM concentration and for n = 11). The method was successfully applied to the determination of nitrazepam in Coca-Cola beverage, urine and plasma, and the recovery was 98-103%. We also considered the possible CL reaction mechanism.