51707

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Simultaneous measurement of ionic current and fluorescence from single protein pores.

Andrew J Heron et al.

Journal of the American Chemical Society, 131(5), 1652-1653 (2009-01-17)

The ability to simultaneously monitor both the ionic current and fluorescence from membrane channels and pores has the potential to link structural changes with function in such proteins. We present a new method for simultaneously measuring single-channel electrical currents and

Stabilization of all-trans-retinol by cyclodextrins: a comparative study using HPLC and fluorescence spectroscopy

Semenova EM, et al.

Journal of Inclusion Phenomena and Macrocyclic Chemistry, 44(1-4), 155-158 (2002)

Effect of column temperature and nitrogen flow rate on the separation of cis-permethrinic acid isomers on a (2,3,6-tri-O-methyl)-beta-cyclodextrin coated capillary column.

K Payer et al.

Biomedical chromatography : BMC, 9(3), 135-139 (1995-05-01)

The separation efficiency of a capillary column coated with (2,3,6-tri-O-methyl)-beta-cyclodextrin was determined at the temperature and flow rate ranges of 80-120 degrees C and 0.3-1.5 mL/min respectively using (+) and (-) cis-permethrinic acid methylesters as test compounds. The dependence of

Selective interaction of 2,6-di-O-methyl-β-cyclodextrin and Pluronic F127 micelles leading to micellar rupture: a nuclear magnetic resonance study.

Franca Castiglione et al.

The journal of physical chemistry. B, 115(29), 9005-9013 (2011-06-15)

The triblock-copolymer poly(ethylene oxide)-poly(propyleneoxide)-poly(ethylene oxide) (PEO-PPO-PEO), referred to as Pluronic, is widely studied for its unique aggregation properties and its applications in drug delivery and targeting. In previous studies [Dreiss, C. A.; et al. Soft Matter 2009, 5, 1888-1896], we

A highly sensitive method for the analysis of nitrite ions by capillary zone electrophoresis using water-soluble aminophenylporphyrin derivative as chromogenic reagent.

P Andrighetto et al.

Electrophoresis, 21(12), 2384-2389 (2000-08-12)

The water soluble 5-p-aminophenyl)-10,15,20-tris(p-sulfonatophenyl) porphyrin, 4, acts as an extremely efficient chromogenic reagent for the detection of very low amounts of nitrites. The amino group of porphyrin 4 reacts smoothly with nitrite in acidic conditions 0.2 M HCl) producing the

pH-dependence of complexion constants and complex mobility in capillary electrophoresis separations of dipeptide enantiomers.

S Sabbah et al.

Electrophoresis, 22(15), 3163-3170 (2001-10-09)

The chiral separation of the LL- and DD-enantiomers of the dipeptides Ala-Tyr, Phe-Phe, and Asp-PheOMe has been investigated at pH 2.5 and pH 3.5 using beta-cyclodextrin (beta-CD), heptakis-(2,6-di-O-methyl)-beta-cyclodextrin, and heptakis-(2,3,6-tri-O-methyl)-beta-cyclodextrin as chiral selectors. According to electrospray mass spectrometry, heptakis-(2,6-di-O-methyl)-beta-cyclodextrin was

Crystal structure of heptakis (2, 3, 6-tri-O-methyl)-beta-cyclodextrin complexes with m-iodophenol and 4-biphenylacetic acid. Guest-induced conformational change of a pyranose ring

Harata K, et al.

Journal of the Chemical Society. Perkin Transactions 1, 7, 1159-1166 (1992)

Combined use of chiral ionic liquid and CD for MEKC: Part II. Determination of binding constants.

Bin Wang et al.

Electrophoresis, 30(16), 2820-2828 (2009-08-20)

A competitive inhibition mechanism is proposed to investigate the interactions among 2,3,6-tri-O-methyl-beta-CD (TM-beta-CD), cationic ionic liquid type surfactants, N-undecenoxy-carbonyl-L-leucinol bromide (L-UCLB) and profens using affinity CE. The apparent binding constant of TM-beta-CD to L-UCLB was estimated by nonlinear and linear

Separation and quantitation of the four stereoisomers of itraconazole in pharmaceutical formulations by electrokinetic chromatography.

María Castro-Puyana et al.

Electrophoresis, 27(4), 887-895 (2006-01-18)

The four stereoisomers of itraconazole were resolved for the first time by EKC using a CD as chiral selector. A study on the enantiomeric separation ability of different neutral CDs was carried out. Heptakis-2,3,6-tri-O-methyl-beta-CD was shown to provide the highest

Convenient scaffold for forming heteroporphyrin arrays in aqueous media.

Koji Kano et al.

Journal of the American Chemical Society, 125(35), 10625-10634 (2003-08-28)

A new methodology for preparing heteroporphyrin arrays in aqueous solution has been presented. The present method is based on the extremely strong ability of heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (TMe-beta-CD) to include 5,10,15,20-tetrakis(p-substituted-phenyl)porphyrins (Por) affording trans-type 1:2 complexes of the porphyrins and TMe-beta-CD. Two

Sub- and supercritical chiral separation of racemic compounds on columns with stationary phases having different functional groups.

Hiroko F Kasai et al.

Chemical & pharmaceutical bulletin, 53(10), 1270-1276 (2005-10-06)

Separation of the enantiomers of each of three different racemates, neutral rac-alpha-tetralol, acidic rac-2-phenylpropionic acid, and basic rac-1-phenylethylamine, using subcritical and supercritical fluid chromatography with two different chiral stationary phases, heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (Sumichiral OA-7500 column) and tris(3,5-dimethylphenylcarbamate) of amylose (Chiralpak AD-H

Enantiomeric separation of gemfibrozil chiral analogues by capillary electrophoresis with heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin as chiral selector.

Alessandra Ammazzalorso et al.

Journal of chromatography. A, 1088(1-2), 110-120 (2005-09-01)

The enantiomeric separation of gemfibrozil chiral analogues was performed by capillary zone electrophoresis (CZE). Resolution of the enantiomers was achieved using heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (TM-beta-CD) as chiral selector dissolved into a buffer solution. In order to optimize the separation conditions, type, pH

Crystal structures of heptakis (2, 3, 6-tri-O-methyl)-beta-cyclodextrin complexes with (R)-and (S)-Flurbiprofen

Harata K, et al.

Journal of inclusion phenomena, 6(5), 443-460 (1988)

Characterization of Crystalline Complexes between Heptakis (2, 3, 6-tri-O-methyl)-beta-cyclodextrin and Various Alkanes or Alkenes (5? C? 10)?

Cardinael P, et al.

Journal of Inclusion Phenomena and Macrocyclic Chemistry, 39(1-2), 159-167 (2001)

Consequences of variable purity of heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin determined by liquid chromatography-mass spectrometry on the enantioselective separation of polychlorinated compounds.

A Jaus et al.

Journal of chromatography. A, 905(1-2), 59-67 (2001-02-24)

The composition of 10 batches of heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (PM-CD) from different suppliers was determined by high-performance liquid chromatography combined with atmospheric pressure chemical ionisation mass spectrometry (MS). Considerable differences were found. Some batches consisted of more than 95% pure PM-CD, whereas

Enantiomeric separation of acidic compounds by nano-liquid chromatography with methylated-beta-cyclodextrin as a mobile phase additive.

Anna Rocco et al.

Journal of separation science, 32(10), 1696-1703 (2009-04-17)

Some racemic nonsteroidal anti-inflammatory drugs, namely naproxen, indoprofen, ketoprofen, flurbiprofen, carprofen, cicloprofen, flunoxaprofen and suprofen were separated into their enantiomers by nano-LC. Chiral recognition was achieved adding to the mobile phase heptakis (2,3,6-tri-O-methyl)-beta-cyclodextrin (TM-beta-CD). Capillary columns of 100 microm id

Application of dual cyclodextrin systems in capillary electrophoresis enantioseparations.

Anne-Catherine Servais et al.

Methods in molecular biology (Clifton, N.J.), 970, 289-295 (2013-01-04)

The enantioseparation of acidic and neutral compounds can be successfully achieved in capillary electrophoresis (CE) using dual cyclodextrin (CD) systems. This chapter describes how to separate the enantiomers of acidic or neutral substances using dual CD systems made up of

Interaction of heptakis (2,3,6-tri-O-methyl)-beta-cyclodextrin with cholesterol in aqueous solution.

Juziro Nishijo et al.

Chemical & pharmaceutical bulletin, 52(12), 1405-1410 (2004-12-04)

The interaction of cholesterol with heptakis (2,3,6-tri-O-methyl)-beta-cyclodextrin (TOM-beta-CyD) was investigated in water using solubility method. It was found that TOM-beta-CyD forms two kinds of soluble complexes, with molar ratios of 1:1 and 1:2 (cholesterol:TOM-beta-CyD). The thermodynamic parameters for 1:1 and

Low-frequency vibrational spectrum of water around cyclodextrin and its methyl-substituted derivatives.

Madhurima Jana et al.

Langmuir : the ACS journal of surfaces and colloids, 26(17), 14097-14102 (2010-08-14)

Atomistic molecular dynamics (MD) simulations have been carried out to study the low-frequency intermolecular vibrational spectrum of water present in the surrounding hydration layers and inside the cavities of beta-cyclodextrin (BCD) and its di- and trimethyl substituted derivatives, namely, heptakis(2,6-di-O-methyl)-beta-cyclodextrin

Separation of the enantiomers of ibuprofen and its major phase I metabolites in urine using capillary electrophoresis.

I Bjørnsdottir et al.

Electrophoresis, 19(3), 455-460 (1998-04-29)

A capillary electrophoresis method for determination of the enantiomers of ibuprofen and its major phase I metabolites: 2'-hydroxyibuprofen and 2'-carboxyibuprofen in urine samples have been developed. Cyclodextrins and linear dextrins have been investigated as chiral selectors. Simultaneous chiral separation of

Structure of the inclusion complexes of heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin with indole-3-butyric acid and 2,4-dichlorophenoxyacetic acid.

Frantzeska Tsorteki et al.

Carbohydrate research, 339(2), 233-240 (2003-12-31)

The crystal structures of the complexes of heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin with indole-3-butyric acid and with 2,4-dichlorophenoxyacetic acid were studied by X-ray diffraction. The complexes crystallize in the monoclinic P2(1) space group. The host molecules are elliptically puckered and stacked along the a

Prediction of selectivity for enantiomeric separations of uncharged compounds by capillary electrophoresis involving dual cyclodextrin systems.

Adel M Abushoffa et al.

Journal of chromatography. A, 948(1-2), 321-329 (2003-07-02)

The single-isomer polyanionic cyclodextrin (CD) derivative heptakis-6-sulfato-beta-cyclodextrin (HSbetaCD) has been tested as chiral additive for the enantioseparation of non-steroidal anti-inflammatory drugs, such as fenoprofen, flurbiprofen, ibuprofen and ketoprofen, in capillary electrophoresis, using a pH 2.5 phosphoric acid-triethanolamine buffer in the

Study of the interaction of dithranol with heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin in solution and in the solid state.

S Cafaggi et al.

The Journal of pharmacy and pharmacology, 50(3), 257-264 (1998-05-26)

The interaction between dithranol and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (TMBCyD) has been investigated in aqueous solution containing isoascorbic acid (0.2% w/v) as antioxidant and in the solid state. The interaction in the solid state was studied by differential scanning calorimetry (DSC), infrared spectroscopy

[Synthesis of heptakis(2,3,6-tri-O-methoxymethyl)-beta-cyclodextrin and its application in gas chromatography].

Mingming Yin et al.

Se pu = Chinese journal of chromatography, 29(1), 91-94 (2011-05-18)

A new chiral stationary phase for gas chromatography, heptakis (2, 3, 6-tri-O-methoxymethyl)-beta-cyclodextrin, was synthesized by substituting the 2,3,6-OH groups of beta-cyclodextrin with methoxymethyl groups, and a coated capillary column for gas chromatography was made by coating this new stationary phase

Inclusion compounds of plant growth regulators in cyclodextrins. V. 4-Chlorophenoxyacetic acid encapsulated in beta-cyclodextrin and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin.

Frantzeska Tsorteki et al.

Acta crystallographica. Section B, Structural science, 61(Pt 2), 207-217 (2005-03-18)

The crystal structures of 4-chlorophenoxyacetic acid (4CPA) included in beta-cyclodextrin (beta-CD) and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (TMbetaCD) have been studied by X-ray diffraction. The 4CPA/beta-CD complex crystallizes as a head-to-head dimer in the space group C2 in the Tetrad packing mode. The packing

[Preparation of stationary phases of four beta-cyclodextrin derivatives for gas chromatography by sol-gel technique].

Xiaoxia Ge et al.

Se pu = Chinese journal of chromatography, 23(3), 305-307 (2005-08-30)

Heptakis (2,3,6-tri-O-ethyl)-beta-cyclodextrin (CD) (perethylated-beta-CD), heptakis (2,3,6-tri-O-propyl)-beta-CD (perpropylated-beta-CD), heptakis (2,3,6-tri-O-octyl)-beta-CD (peroctylated-beta-CD), and (2,6-di-O-benzyl)-beta-CD were used as stationary phases to prepare columns for gas chromatography by sol-gel technique. The method of coating the columns is similar to the dynamic method and the

Combined use of chiral ionic liquid and cyclodextrin for MEKC: Part I. Simultaneous enantioseparation of anionic profens.

Bin Wang et al.

Electrophoresis, 30(16), 2812-2819 (2009-08-04)

The enantiomers of five profen drugs were simultaneously separated by MEKC with the combined use of 2,3,6-tri-O-methyl-beta-cyclodextrin and chiral cationic ionic liquid, N-undecenoxy-carbonyl-L-leucinol bromide, which formed micelles in aqueous buffers. Enantioseparations of these profen drugs were optimized by varying the

Enantiomeric separation of cis-bifenthrin by CD-MEKC: quantitative analysis in a commercial insecticide formulation.

Virginia Pérez-Fernández et al.

Electrophoresis, 31(9), 1533-1539 (2010-04-28)

The first CE method enabling the enantiomeric separation of the synthetic pyrethroid cis-bifenthrin (BF) was developed in this work. CD-MEKC was the CE mode employed for this purpose. The influence of several experimental parameters such as temperature, voltage, type and

Mechanistic study of opposite migration order of dimethindene enantiomers in capillary electrophoresis in the presence of native beta-cyclodextrin and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin.

B Chankvetadze et al.

Journal of chromatography. A, 875(1-2), 455-469 (2000-06-06)

The possible mechanisms of the opposite affinity pattern of the enantiomers of dimethindene [(R,S)-N,N-dimethyl-3[1(2-pyridyl)ethyl]indene-2-ethylamine] (DIM) towards native beta-cyclodextrin (beta-CD) and heptakis(2,3,6-tri-O-methyl-)-beta-CD (TM-beta-CD) were studied using capillary electrophoresis (CE), NMR spectrometry, electrospray ionization mass spectrometry (ESI-MS) and X-ray crystallography. NMR spectrometry

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