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338 results on '"Lee, Kang ‐ Bong"'

59. Colorimetric Aptasensor for Detecting Bacillus carboniphilus Using Aptamer Isolated with a Non-SELEX-Based Method

Author

Ho Kyeong Kim, Byoung Chan Kim, Jungbae Kim, Lee Kang Bong, Hye Ri Kim, and Su Jin Yoon

Subjects
Detection limit, 0303 health sciences, Chromatography, Chemistry, Aptamer, non-SELEX-based method, QD415-436, 02 engineering and technology, 021001 nanoscience & nanotechnology, Biochemistry, colorimetric aptasensor, Analytical Chemistry, Dissociation constant, Bacillus carboniphilus, 03 medical and health sciences, Colloidal gold, Centrifugation, Physical and Theoretical Chemistry, 0210 nano-technology, Selectivity, gold nanoparticle, bacteria-specific aptamer, Systematic evolution of ligands by exponential enrichment, 030304 developmental biology
Abstract

B. carboniphilus is a naphtha-degradative strain (NDS) that uses hydrocarbons for its growth and causes microbiologically influenced corrosion (MIC) in naphtha pipelines. To date, there have been no studies on receptors or sensors for the detection of B. carboniphilus. We isolate B. carboniphilus-specific aptamers with a non-SELEX-based method, which employs repetitive cycles of centrifugation-based partitioning. The binding affinities of three aptamers are evaluated by obtaining their dissociation constants (Kd), which range from 13.2 to 26.3 nM. The BCA-05 aptamer with the lowest Kd value is employed for a two-stage label-free aptasensing platform to verify the aptamer selectivity using colorimetric detection of B. carboniphilus. This platform starts with the aptamer-bacteria binding step, and the concentration of residual aptamer after binding depends on the amount of the target bacteria. Then, the amount of separated residual aptamer determines the degree of salt-induced aggregation of gold nanoparticles (AuNPs), which results in a color change from red to blue. The AuNP color change is expressed as the ratio of absorbances at 630 and 520 nm (A630/A520). Under optimized conditions, this aptasensor shows reliable performance with a linear correlation in the range 104–107 CFU mL−1 and a limit of detection of 5 × 103 CFU mL−1.

Published
2021

62. Glutathione Functionalized Gold Nanoparticles for Colorimetric Detection of Didecyldimethylammonium Chloride

Author

Lee Kang‐Bong, Kim Kyung Min, Nah In Wook, Nam Yun‐Sik, and Lee Yeonhee

Subjects
Materials science, 010401 analytical chemistry, Biomedical Engineering, Bioengineering, 02 engineering and technology, General Chemistry, Glutathione, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Colloidal gold, General Materials Science, 0210 nano-technology, Didecyldimethylammonium chloride, Nuclear chemistry
Published
2016

63. Unique fluxional behavior. Synthesis, structure, and properties of novel (diamine)platinum(II) complexes of 9-fluorenylidene- and benzhydrylidenemalonate ligands

Author

Lee, Young-A, Jung, Ok-Sang, Kang, Seong-Joo, Lee, Kang-Bong, and Sohn, Youn Soo

Subjects
Platinum compounds -- Research, Coordination compounds -- Research, Ligands -- Research, Chemistry
Abstract

The synthesis and characterization of the new (diamine)platinum complexes A2PtX2, where A2 = trans-(+/-)-1,2-diaminocyclohexane, tetrahydro-4H-pyran-4,4-diylbis(methylamine); X2 = 9-fluorenylidenemalonate, benzhydrolidenemalonate, are presented. The dynamic structural behaviors of the complexes were determined based on their multinuclear NMR spectra and X-ray crystal structures. A temperature-dependent fluxional motion of the remote anionic ligands has been observed to cause prominent molecular dynamics on the amine protons for complexes with arylidene anionic ligands.

Published
1996

66. Effect of the Impurity Incorporation on the Performance of Cu(In,Ga)Se2 Semiconductor Solar Cells

Author

Lee Kang‐Bong, Kim Minjung, Kim Haidong, Lee Yeonhee, and Lee Jihye

Subjects
Materials science, business.industry, 010401 analytical chemistry, Biomedical Engineering, Bioengineering, General Chemistry, 010501 environmental sciences, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Semiconductor, Impurity, Optoelectronics, General Materials Science, business, 0105 earth and related environmental sciences
Published
2016

80. Improved quantitative analysis of Cu(In,Ga)Se2 thin films using MCs+-SIMS depth profiling

Author

Yeonhee Lee, Seon Hee Kim, Lee Kang Bong, Byoung Koun Min, and Jihye Lee

Subjects
business.industry, Band gap, Chemistry, Analytical chemistry, Astrophysics::Cosmology and Extragalactic Astrophysics, General Chemistry, Copper indium gallium selenide solar cells, Ion, Secondary ion mass spectrometry, Semiconductor, Attenuation coefficient, General Materials Science, Inductively coupled plasma, Thin film, business
Abstract

The chalcopyrite semiconductor, Cu(InGa)Se2 (CIGS), is popular as an absorber material for incorporation in high-efficiency photovoltaic devices because it has an appropriate band gap and a high absorption coefficient. To improve the efficiency of solar cells, many research groups have studied the quantitative characterization of the CIGS absorber layers. In this study, a compositional analysis of a CIGS thin film was performed by depth profiling in secondary ion mass spectrometry (SIMS) with MCs+ (where M denotes an element from the CIGS sample) cluster ion detection, and the relative sensitivity factor of the cluster ion was calculated. The emission of MCs+ ions from CIGS absorber elements, such as Cu, In, Ga, and Se, under Cs+ ion bombardment was investigated using time-of-flight SIMS (TOF-SIMS) and magnetic sector SIMS. The detection of MCs+ ions suppressed the matrix effects of varying concentrations of constituent elements of the CIGS thin films. The atomic concentrations of the CIGS absorber layers from the MCs+-SIMS exhibited more accurate quantification compared to those of elemental SIMS and agreed with those of inductively coupled plasma atomic emission spectrometry. Both TOF-SIMS and magnetic sector SIMS depth profiles showed a similar MCs+ distribution for the CIGS thin films.

Published
2013

86. The disappearance rate and risk assessment of thiacloprid residues in Asian pear using liquid chromatography confirmed with tandem mass spectrometry

Author

Kabir, Md. Humayun, primary, Abd El-Aty, A.M., additional, Rahman, Md. Musfiqur, additional, Kim, Sung-Woo, additional, Choi, Jeong-Heui, additional, Lee, Young-Jun, additional, Truong, Lieu T.B., additional, Lee, Kang-Bong, additional, Kim, Mi-Ra, additional, Shin, Ho-Chul, additional, and Shim, Jae-Han, additional

Published
2016
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88. TOF-SIMS Analysis of Red Color Inks of Writing and Printing Tools on Questioned Documents

Author

Yun Sik Nam, Yeonhee Lee, Jisook Min, Jihye Lee, and Lee Kang Bong

Subjects
Materials science, Laser printing, business.industry, Image map, 010401 analytical chemistry, Stamping, 01 natural sciences, Red Color, 0104 chemical sciences, Pathology and Forensic Medicine, Secondary ion mass spectrometry, 03 medical and health sciences, symbols.namesake, 0302 clinical medicine, Optics, Fourier transform, Attenuated total reflection, Genetics, symbols, Forensic engineering, 030216 legal & forensic medicine, business
Abstract

Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is a well-established surface technique that provides both elemental and molecular information from several monolayers of a sample surface while also allowing depth profiling or image mapping to be performed. Static TOF-SIMS with improved performances has expanded the application of TOF-SIMS to the study of a variety of organic, polymeric, biological, archaeological, and forensic materials. In forensic investigation, the use of a minimal sample for the analysis is preferable. Although the TOF-SIMS technique is destructive, the probing beams have microsized diameters so that only small portion of the questioned sample is necessary for the analysis, leaving the rest available for other analyses. In this study, TOF-SIMS and attenuated total reflectance Fourier transform infrared (ATR-FTIR) were applied to the analysis of several different pen inks, red sealing inks, and printed patterns on paper. The overlapping areas of ballpoint pen writing, red seal stamping, and laser printing in a document were investigated to identify the sequence of recording. The sequence relations for various cases were determined from the TOF-SIMS mapping image and the depth profile. TOF-SIMS images were also used to investigate numbers or characters altered with two different red pens. TOF-SIMS was successfully used to determine the sequence of intersecting lines and the forged numbers on the paper.

Published
2015

89. Rapid-Response and Highly Sensitive Boronate Derivative-Based Fluorescence Probe for Detecting H2O2 in Living Cells.

Author

Selvaraj, Muthusamy, Rajalakshmi, Kanagaraj, Nam, Yun-Sik, Lee, Yeonhee, Kim, Byoung Chan, Pai, Sung Jin, Han, Sang Soo, and Lee, Kang-Bong

Subjects
FLUORESCENCE, BORONIC esters, REACTIVE oxygen species, ENVIRONMENTAL sampling, FUNCTIONAL groups, PEROXIDES
Abstract

Intracellular H2O2 monitoring is important and has driven researchers to pursue advancements for the rapid identification of H2O2, since H2O2 is short-lived in cell lines. An arylboronate derivative has been investigated as a chemospecific fluorescence recognition agent for H2O2. Triphenylimidazoleoxadiazolephenyl (TPIOP) boronate was contrived as a novel candidate for the rapid and sensitive recognition of H2O2. The probe was conjugated using the TPIOP functional group acting as an excellent fluorescent enhancer. The TPIOP group stimulated the polarization of C–B bond due to its extended π-conjugation, which included heteroatoms, and induced the production of rapid signal because of the highly polar C–B bond along with the corresponding boronate unit. While H2O2 reacts with TPIOP boronate, its nucleophilic addition to the boron generates a charged tetrahedral boronate complex, and then the C–B bond migrates toward one of the electrophilic peroxide oxygen atoms. The resulting boronate ester is then hydrolyzed by water into a phenol, which significantly enhances fluorescence through aggregation-induced emission. The TPIOP boronate probe responded to H2O2 rapidly, within 2 min, and exhibited high sensitivity with a limit of detection of 8 nM and a 1000-fold selectivity in the presence of other reactive oxygen species. Therefore, the developed TPIOP boronate chemodosimeter was successfully utilized to visualize and quantify intracellular H2O2 from human breast cancer (MCF-7) cells, as well as gaseous and aqueous H2O2 from environmental samples using Whatman paper strips coated with TPIOP boronate. [ABSTRACT FROM AUTHOR]

Published
2019
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90. Hydrogen bonding abilities of thioamide

Author

Lee, Ho-Jin, Choi, Young-Sang, Lee, Kang-Bong, Park, Jeunghee, and Yoon, Chang-Ju

Subjects
Hydrogen bonding -- Research, Hydrogen bonding -- Chemical properties, Chemical reactions -- Analysis, Protons -- Analysis, Chemicals, plastics and rubber industries
Abstract

An investigation of the strengths of hydrogen bonding interaction between formamide (FA) and thioformamide (TFA) at theB3LYP level with the 6-311G(d,p), 6-31 +G(d,p), and 6-311 ++G(2d,2p) basis sets is presented. The results indicate that the proton affinity (PA) values of the deprotonated TFA and FA anions have a linear correlation with the ability as hydrogen bond donors.

Published
2002

93. Various extraction methods for detection of bistrifluron residues in Asian pear using high-performance liquid chromatography: application to dissipation patterns under open-field conditions

Author

Truong, Lieu T. B., primary, Kim, Sung Woo, additional, Abd El-Aty, A. M., additional, Kabir, Humayun, additional, Rahman, Musfiqur, additional, Choi, Jeong-Heui, additional, Shin, Ho-Chul, additional, Kwon, Chan-Hyeok, additional, Lee, Kang-Bong, additional, Yoon, Hae Jung, additional, and Shim, Jae Han, additional

Published
2016
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95. Analysis of mandipropamid residual levels through systematic method optimization against the matrix complexity of sesame leaves using HPLC/UVD

Author

Farha, Waziha, primary, Rahman, Md. Musfiqur, additional, Abd El‐Aty, A. M., additional, Kim, Sung‐Woo, additional, Jung, Da‐I, additional, Im, So Jeong, additional, Choi, Jeong‐Heui, additional, Kabir, Md. Humayun, additional, Lee, Kang‐Bong, additional, Shin, Ho‐Chul, additional, and Shim, Jae‐Han, additional

Published
2015
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96. A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine.

Author

Kim, Kyung Min, Nam, Yun-Sik, Lee, Yeonhee, and Lee, Kang-Bong

Subjects
MERCURY, GOLD nanoparticles, POLYETHYLENEIMINE, COLORIMETRY, SPECTROPHOTOMETRY
Abstract

A highly sensitive and selective colorimetric assay for the detection of Hg2+ ions was developed using gold nanoparticles (AuNPs) conjugated with polyethyleneimine (PEI). The Hg2+ ion coordinates with PEI, decreasing the interparticle distance and inducing aggregation. Time-of-flight secondary ion mass spectrometry showed that the Hg2+ ion was bound to the nitrogen atoms of the PEI in a bidentate manner (N–Hg2+–N), which resulted in a significant color change from light red to violet due to aggregation. Using this PEI-AuNP probe, determination of Hg2+ ion can be achieved by the naked eye and spectrophotometric methods. Pronounced color change of the PEI-AuNPs in the presence of Hg2+ was optimized at pH 7.0, 50°C, and 300 mM·NaCl concentration. The absorption intensity ratio (A700/A514) was correlated with the Hg2+ concentration in the linear range of 0.003–5.0 μM. The limits of detection were measured to be 1.72, 1.80, 2.00, and 1.95 nM for tap water, pond water, tuna fish, and bovine serum, respectively. Owing to its facile and sensitive nature, this assay method for Hg2+ ions can be applied to the analysis of water and biological samples. [ABSTRACT FROM AUTHOR]

Published
2018
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99. A combination of solid-phase extraction and dispersive solid-phase extraction effectively reduces the matrix interference in liquid chromatography-ultraviolet detection during pyraclostrobin analysis in perilla leaves

Author

Farha, Waziha, primary, Rahman, Md. Musfiqur, additional, Abd El-Aty, A. M., additional, Jung, Da-I., additional, Kabir, Md. Humayun, additional, Choi, Jeong-Heui, additional, Kim, Sung-Woo, additional, Jeong Im, So, additional, Lee, Young-Jun, additional, Shin, Ho-Chul, additional, Kwon, Chan-Hyeok, additional, Son, Young-Wook, additional, Lee, Kang-Bong, additional, and Shim, Jae-Han, additional

Published
2015
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