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Journal of Biophysical Chemistry 2016年第2期7卷 43-48页

作者： Yusuke Kobayashi Rina Hirai Daiki Ito Yasushi Yamamoto keijiro taga Zameer Shervani Department of Life Science and Material Engineering Nagoya Institute of Technology Nagoya Japan Department of Life Science and Material Engineering Nagoya Institute of Technology Nagoya Japan 2Tohoku Foods Corporation Limited Sendai Japan Tohoku Foods Corporation Limited Sendai Japan

We have investigated the morphology of novel 3, 4-bis-alkyloxycarbonyl-hexanedioic acid monolayer (alkyl chain number n = 12, 14, and 16) formed on the water surface by dropping method using Surface Tension measurement (STm) and Brewster Angle Microscopy (BAM). Surfactant of 3, 4-bis-alkyloxycarbonyl-hexanedioic acid has a gemini type structure. π-A isotherm curves (STm) of two gemini surfactants of n = 12 and 14 showed gradual increase in surface pressure, while that of n = 16 showed gradual increase, a stagnant range and finally steep increase. BAM observation showed each image corresponding to the result of STm measurement. From STm and BAM results of surfactants, it is found that surfactant of n = 12 and 14 form Liquid-Expand (LE) type monolayer, while that of n = 16 formed Liquid-Condensed (LC) type monolayer including LE-LC phase transition.

关键词： 3 4-Bis-Alkyloxycarbonyl-Hexanedioic Acid Gemini Surfactants Gemsurfs Monolayer Morphology

Surface Properties of Novel Surfactant, Dihexadecyl Gemini Phosphate, Monolayers on Water Surface by Dropping Method

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Journal of Biophysical Chemistry 2017年第4期8卷 39-50页

作者： Yusuke Kobayashi Takahiko Amano keijiro taga Yasushi Yamamoto Zameer Shervani Masato Yamamoto Department of Life Science and Applied Chemistry Graduate School of Engineering Nagoya Institute of Technology Nagoya Japan Nanomaterials Production Division Food and Energy Security Research and Product Center Sendai Japan Department of Chemistry School of Arts and Sciences Showa University Yamanashi Japan

We have synthesized first novel dihexadecyl phosphate (DHGP-n) gemini surfactants containing alkyl chain ((CnH2n);n = 3, 4, 5, and 6) spacers. Surfactants were used to form monolayers on water surface. Surface tension measurement (STm), Brewster angle microscopy (BAM), and density functional theory (DFT) calculation were used to investigate these monolayers. Surface pressure (π) and molecular area (A);π-A isotherm curves of all DHGP-n gemini surfactants showed a gradual increase in surface pressure without any break points in the curves, confirmed the formation of liquid-expand (LE) type monolayers. BAM observations also supported the STm results. Limited molecular area (A0) of these monolayers depended on the spacer of gemini surfactants without spacer n = 4. Longer alkyl chain spacer in the series had higher value of A0 in π-A isotherm plots. In the series, A0 of spacer n = 4 was smallest among A0 values of other spacers. Density functional theory (DFT) method calculation also confirmed π-A isotherm curves pattern of these surfactants. Calculation showed that both odd and even numbers and length of the alkyl chain spacer influenced the structure of DHGP-n monolayer formation on the water surface.

关键词： Dihexadecyl Gemini Phosphates Monolayers Surface Tension Measurement Brewster Angle Microscopy Density Functional Theory Calculation

Structural Change in Dimyristoyl Phosphatidyl Choline (DMPC) Molecule Alkyl Chains on the Addition of Cholesterol to DMPC Monolayer: Specific Addition Effect of Cholesterol

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Journal of Biophysical Chemistry 2019年第2期10卷 15-29页

作者： Daiki Ito Takanari Ikeda keijiro taga Yasushi Yamamoto Zameer Shervani Masato Yamamoto Department of Life Science and Applied Chemistry Graduate School of Engineering Nagoya Institute of Technology Nagoya Aichi Japan Nanomaterials Production Division Food and Energy Security Research and Product Center Sendai Japan Department of Chemistry School of Arts and Sciences Showa University Kamiyoshida Fujiyoshida Yamanashi Japan

We have investigated the morphology of dimyristoyl phosphatidyl choline (DMPC)—cholesterol mixed monolayer formed on the water surface by dropping method using surface tension measurement (STm), Brewster angle microscopy (BAM), and infrared external reflection spectroscopy (IERS). STm results showed negative deviation of the limiting molecular area (A0) of cholesterol occurred when cholesterol was added to the DMPC monolayer. BAM images showed the expandable DMPC monolayer changed to the condensed rigid monolayer at more than cholesterol mole fraction (xChol) 0.4. IERS recordings showed that the addition of cholesterol at xChol = 0.4 occurred structural change from gauche- to trans- conformation of two DMPC molecule alkyl chains. From these results, it is found that cholesterol molecule has specific properties that cause structural transition of DMPC molecule alkyl chains.

关键词： Dimyristoyl Phosphatidyl Choline (DMPC) Cholesterol Surface Tension Measurement (STm) Brewster Angle Microscopy (BAM) Infrared External Reflection Microscopy (IERS) Structural Transition

Physical Properties in Aqueous Solutions for a Series of Alkyltrimethylammonium Salicylates (C12TA-Sal through C16TA-Sal): From a View Point of Drag Reduction

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Soft Nanoscience Letters 2016年第4期6卷 45-55页

作者： Yasushi Yamamoto Takashi Arai Takashi Tomita Zameer Shervani Akihiro Yoshino keijiro taga Shinji Tamano Motoyuki Itoh Yoshitaka Taguchi Graduate School of Engineering Nagoya Institute of Technology Nagoya Japan Chukyo Yushi Co. Ltd. Nagoya Japan

Compounds for a series of alkyltrimethylammonium salicylates (C12TA-Sal through C16TA-Sal) were synthesized. Their physical properties in aqueous solutions were investigated by conductometry, viscometry, vortex inhibition, viscoelastic recoil and swirling decay time from a view point of drag reduction. For critical micelle concentrations (CMC) obtained for a series of compounds by conductometry, it was found that a linear relation of the form, log(CMC)= 4.088﹣0.305*Nc (Nc: carbon number in the alkyl chain), holds. From the viscosity measurement, all the compounds showed viscosity increase above their CMC. Vortex inhibition was observed above the CMC for the compounds with the chain length longer than C13. Viscoelastic recoil was observed above the concentration of one and a half times the CMC for the compounds with alkyl chain length longer than C14.

关键词： Drag Reduction Vortex Inhibition Viscoelastic Recoil CMC

Study of physisorption of volatile anesthetics on phos-pholipid monolayers using a highly sensitive quartz crystal microbalance (HS-QCM)

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Journal of Biophysical Chemistry 2011年第2期2卷 68-74页

作者： Yasushi Yamamoto Zameer Shervani Takatsugu Shimoaki Daisuke Yoshida Takashi Yokoyama Tadayoshi Yoshida keijiro taga Hiroshi Kamaya Issaku Ueda 不详

We have investigated the interactions between phospholipid monolayers and volatile anest-hatics. Two monolayers (dihexadecyl phosphate (DHP) and dipalmitoyl phosphatidyl choline (DPPC) and two anesthetics (halothane and enflurane) were used to observe these interac-tions using a highly sensitive quartz crystal microbalance (HS-QCM). The concentration of each anesthetic in aqueous solution was kept at 4 mM. The frequency of QCM showed no change when halothane was added to the DHP monolayer, however, it responded and de-creased when interaction occurred with DPPC monolayer. In case of enflurane addition the frequency decreased in both the monolayers of DHP and DPPC. The frequency change followed the following order of monolayer-anesthetic interactions: DHP-halothane

关键词： Physisorption Phospholipid Monolayers Quartz Crystal Microbalance (QCM) Anesthetic Hydrate Monolayer-Water Interface

Interactions between Phospholipid Monolayers (DPPC and DMPC) and Anesthetic Isoflurane Observed by Quartz Crystal Oscillator

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Journal of Biophysical Chemistry 2015年第2期6卷 42-53页

作者： Yasushi Yamamoto Takashi Yokoyama Daisuke Yoshida Hiroya Mori Karina Sekiguchi Takatsugu Shimoaki Akihiro Yoshino keijiro taga Zameer Shervani Masato Yamamoto Department of Materials Science and Engineering Nagoya Institute of Technology Nagoya Japan Tohoku Foods Corporation Limited Sendai Japan Department of Chemistry Graduate School of Science Tohoku University Sendai Japan College of Arts and Sciences Showa University Fujiyoshida Japan

The interactions of phospholipid monolayers (dipalmitoyl phosphatidyl choline;DPPC and dimyristoyl phosphatidyl choline;DMPC) with volatile anesthetic isoflurane were investigated using quartz crystal microbalance (QCM) and quartz crystal impedance (QCI) methods. The quartz crystal oscillator was attached horizontally on the surface of DPPC and DMPC monolayer formed on the water surface. Physisorption of isoflurane hydrate at the DPPC monolayer surface was monitored in terms of frequency and resistance change of quartz crystal on addition of anesthetics isoflurane. Both frequency and resistance change showed the elastic nature of DPPC monolayer. Measurement of DMPC monolayer-isoflurane hydrate revealed the expandable nature of DMPC monolayer. Variation of frequency and impedance of DPPC and DMPC monolayer on addition of isoflurane which proved a two-step change has occurred at monolayer surface at isoflurane concentration of ≤8 mM that has been attributed to isoflurane aggregation at monolayer/water interface. Isoflurane hydrates formed in the process have capability to affect the interfacial properties of monolayer such as existence of structured water.

关键词： Physisorption DPPC Monolayer DMPC Monolayer Quartz Crystal Oscillator Anesthetic Isoflurane-Monolayer Interaction

MorphologicaObservation of Specific Condensation Effect of Cholesterol on Dipalmitoyl Phosphatidyl Choline (DPPC) Monolayer by Dropping Method

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Journal of Biophysical Chemistry 2016年第4期7卷 98-109页

作者： Takashi Yokoyama Daisuke Yoshida Hiroya Mori Masaya Okabe Zameer Shervani keijiro taga Yasushi Yamamoto Ayumi Sumino Takehisa Dewa Mamoru Nango Masato Yamamoto Department of Materials Science and Engineering Nagoya Institute of Technology Nagoya Japan Tohoku Foods Company Sendai Japan Department of Frontier Materials Nagoya Institute of Technology Nagoya Japan Department of Chemistry School of Arts and Sciences Showa University Fujiyoshida Japan

Morphology of dipalmitoyl phosphatidyl choline (DPPC)-cholesterol (Chol) mixed monolayer formed on water surface by dropping method was investigated using surface tension measurement (STm), Brewster angle microscopy (BAM), and fluorescence microscopy (FM). STm showed strong condensation effect of Chol in fluidic DPPC monolayer. Excess area (Sex) from mean mixing state of DPPC and Chol was about twice larger than that by general compression method in the range from xC = 0.2 to 0.4 (xC: mole fraction of Chol). BAM and FM images showed clearly that the fluidic DPPC monolayer changed to condensed rigid monolayer due to the condensation effect of Chol. At more than xC = 0.3 DPPC-Chol mixed monolayer changed to condensed state similar to the Chol monolayer. These results support previous reports by compression method that Chol molecule demonstrates the strong condensation effect to the fluidic monolayer and also indicate that dropping method enables to form unique monolayer on the water surface.

关键词： DPPC-Chol Mixed Monolayer Dropping Method Surface Tension Measurement Brewster Angle Microscopy Fluorescence Microscopy Condensation Effect

Morphology observation of dipalmitoyl phosphatidyl choline (DPPC) monolayer on water surface by dropping method

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Journal of Biophysical Chemistry 2013年第4期4卷 115-121页

作者： Daisuke Yoshida Takashi Yokoyama Takatsugu Shimoaki Takashi Tomita Tadayoshi Yoshida Yasushi Yamamoto keijiro taga Ayumi Sumino Takehisa Dewa Mamoru Nango Masato Yamamoto Zameer Sheravani Department of Chemistry School of Arts and Sciences Showa University Fujiyoshida Japan Department of Frontier Materials Nagoya Institute of Technology Nagoya Japan Department of Life Science and Material Engineering Nagoya Institute of Technology Nagoya Japan Tohoku Foods Corporation Limited Sendai Japan

Preparation of DPPC lipid monolayer in water trough has been done by dropping method and compared with compression method. Monolayer was studied by surface pressure isotherm, fluorescence microscopy, Brewster angle microscopy, and infrared external reflection spectroscopy. Results of these measurements showed that dropping method gave better results compared to compression method. In dropping method, transition from liquid expanded state to liquid condensed is gradual compared to sharp one in compressed method. During monolayer formation, adjustment and interaction between hydrophilic part of lipid and water and among hydrophobic part of lipid molecule are slow, stable, and more natural as worked out from surface area versus pressure isotherm. At a given molecular area, surface pressure is less compared to compression method thus monolayer is in more fluidic state in dropping method than compression method. The observation was supported by all techniques described above.

关键词： DPPC Monolayer Dropping Method Surface Tension Fluorescence Microscopy Brewster Angle Microscopy

A Novel Polybrene/Chondroitin Sulfate C Double Coated Capillary and Its Application in Capillary Electrophoresis

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Chinese Journal of Chemistry 2002年第12期20卷 1557-1565,1462页

作者：杜迎翔 HONDA Susumub taga Atsushib 刘文英 SUZUKI Shigeo Department of Analytical Chemistry China Pharmaceutical University Nanjing Jiangsu 210009 China Faculty of Pharmaceutical Sciences Kinki University Higashi‐Osaka 577–8502 Japan Department of Pharmaceutical Analysis China Pharmaceutical University Nanjing Jiangsu 210009 China

A new capillary coated by double polymer, polybrene/chondroitin sulfate C (P/CC), was developed using a simple procedure. The P/CC double coated capillary showed long lifetime, strong chemical stability and good reproducibility. It endured during more than 100 replicated analyses and was also tolerant to HCl (1 mol/L), NaOH (0.01 mol/L), CH3OH and CH3CN. The P/CC double coated capillary can be applied to basic drug analyses. The adsorption of basic drugs to the capillary wall was suppressed and the peak tailing greatly decreased. The use of the P/CC double coated capillary allowed excellent separation of the enantiomers of some basic drugs by using chondroitin sulfate C as the chiral selector, and the peak symmetry of basic drugs was further improved under these conditions.

关键词： capillary electrophoresis anionic capillary coating basic drug chiral separation chondroitin sulfate C

Experimental verification of the effect of cumulative chromatic dispersion on the transmission performance of long-haul WDM system

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Experimental verification of the effect of cumulative chroma...