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무니르순다스,박수영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A TEM grid cell coated with 4-cyano-4´-pentylbiphenyl (5CB) was functionalized with a block copolymer poly(acrylicacid-b-4-cyno-4-undecyl acrylate) (PAA-b-LCP) followed by the co immobilization of two enzymes cholesterol oxidase and horse radish peroxidase for cholesterol detection. Cholesterol was detected by a parallel to perpendicular (bright-dark) orientational change of 5CB under crossed polarizers with a detection limit of 0.8 mM. The high stability of the immobilized enzymes and specific detection of cholesterol in a complex mixture demonstrates a convenient method for screening cholesterol levels in a sample.
Optical detection of cholesterol using β-cyclodextrin at liquid-crystal/aqueous interface
무니르순다스,박수영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The β-cyclodextrin-sodiumdodecylsulphate (β-CD-SDS) inclusion was used for cholesterol detection at 4-cyano-4-pentylbiphenyl (5CB)/aqueous interface. The β-CD acts as a host while the SDS as a guest which was replaced by cholesterol. The 5CB confined in a transmission electron microscope (TEM) grid translate this phenomenon into optical signals. The cholesterol was detected from planar-to-homeotropic transition of the 5CB observed through a polarized optical microscope. This method provides selective detection of cholesterol in comparison to other biomolecules and may be an alternative for cholesterol detection.
무니르순다스,박수영,칸마슈크 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Micrometer sized 4-cyano-4'-pentylbiphenyl (5CB) droplets were functionalized with Poly(acrylicacid-b-4-cynobiphenyl-4'-undecylacrylate) (PAA-b-LCP) using microfluidics technique. The LCP block was strongly anchored in the 5CB while the PAA block formed a brush like structure around the droplets (5CB<sub>PAA</sub>). The 5CB<sub>PAA</sub> were used for the immobization of enzyme such as glucose oxidase (5CB<sub>PAA-GOx</sub>) and urease (5CB<sub>PAA-urease</sub>), and biotinylated (5CB<sub>PAA-biotin</sub>) with the aid of chemical coupling agents. The 5CB<sub>PAA-GOx</sub>, 5CB<sub>PAA-urease</sub>, and 5CB<sub>PAA-biotin</sub> droplets were tested for glucose, urea, and biotin-avidin complexation, respectively, under the tested optimized condition of concentration and pH. The detection of the glucose, urea and avidin-biotin complexation were successfully characterized by configurational change of the 5CB droplets such as a radial-to-bipolar change in glucose and avidin, and a bipolar-to-radial change in urea solutions observed via a polarized optical microscope at 5CB/aqueous interface. These functionalized droplets were having high sensitivity, specificity, and stability to their respective analyte, which demonstrate the versatility of 5CB<sub>PAA</sub> droplets that can make selective detection by immobilization of selective enzymes or through a ligand/receptor model.
황효찬,무니르순다스,박수영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
A TEM grid cell coated with 4-cyano-4-pentylbiphenyl (5CB) functionalized with a block copolymer poly(acrylicacid-b-4-cyno-4-undecyl acrylate) (PAA-b-LCP) followed by the co immobilization of enzymes cholesterol oxidase and horse radish peroxidase was used to detect cholesterol in the sample. High stability and sensitivity of the immobilized enzymes were achieved for cholesterol. Cholesterol was detected by a parallel to perpendicular (bright-dark) orientational change of 5CB under crossed polarizers with a detection limit of 0.8mM. High stability of the immobilized enzymes and specific detection of cholesterol in a complex mixture could provide a convenient method for screening cholesterol levels in sample.
Liquid-crystal based biosensor for urea detection
조우근,칸마슈크,무니르순다스,박수영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A transmission electron microscopy (TEM) grid filled with 4-cyano-4’-pentylbiphenyl (5CB) on an octadecyltrichloro silane-coated glass substrate was coated with a monolayer of poly(acrylicacid-b-4-cyanobiphenyl-4-oxyundecylacrylate) (PAA-b-LCP) and immobilizing urease covalently to the PAA chains for urea detection at the 5CB/aqueous interface. Urea was detected from the planar to homeotropic (P-H) orientational transition of 5CB using a polarized optical microscope. This TEM grid sensor with the maximum immobilization density of urease 0.17 molecules/nm2 enabled the detection of urea at concentrations as low as 5 mM in a response time of 250 s. This TEM grid sensor could detect urea in the blood without any inference from hemoglobin and ascorbic acid and allows easy naked eye detection, and might be useful for practical usage of urea detection.