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Investigating Acid-Induced Structural Transitions of Lysozyme in an Electrospray Ionization Source

26-11-2014 | Jong Wha Lee; Hugh Inkon Kim, Analyst, 2014

The effect of acids on the structure of lysozyme (Lyz) during electrospray ionization (ESI) was studied by comparing the solution and gas-phase structures of Lyz. Investigation using circular dichroism spectroscopy and small-angle X-ray scattering demonstrated that the folded conformation of Lyz ...

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Thermodynamics and preliminary pharmaceutical characterization of a melatonin–pimelic acid cocrystal prepared by a melt crystallization method

25-11-2014 | Yan Yan; Jia-Mei Chen; Tong-Bu Lu, CrystEngComm, 2014

Pharmaceutical cocrystals have been extensively investigated as a promising approach to improve drugs' physicochemical properties. Cocrystals are usually prepared using solution-mediated methods and grinding methods. In this study, a cocrystal of pimelic acid with poorly soluble melatonin was ...

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Synthesis and characterization of Mg–Al-layered double hydroxides intercalated with cubane-1,4-dicarboxylate anions

25-11-2014 | Zolfaghar Rezvani; Farzad Arjomandi Rad; Fatemeh Khodam, Dalton Transactions, 2014

In the present work, Mg2Al-layered double hydroxide (LDH) intercalated with cubane-1,4-dicarboxylate anions was prepared from the reaction of solutions of Mg(ii) and Al(iii) nitrate salts with an alkaline solution of cubane-1,4-dicarboxylic acid by using the coprecipitation method. The successful ...

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Solution Phase Post-modification of Trimesic Acid Network on Au(111) with Zn2+ Ions

25-11-2014 | Jaesung Lee; Jandee Kim; Hyeran Kim; Choong Kyun Rhee; Mike Whangbo, Chemical Communication, 2014

Solution phase post-modification of trimesic acid (TMA) network on Au(111) with Zn2+ ions was found to induce a transformation of a bar-featured scanning tunneling microscopy image of (5√3 × 5√3) to a chevron-pair image of (10√3 × 10√3). Voltammetric determination of Zn coverage in the modified ...

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Structure and Dynamics of Oligonucleotides in the Gas Phase

21-11-2014 | Annalisa Arcella, Jens Dreyer, Emiliano Ippoliti, Ivan Ivani, Guillem Portella, Valérie Gabelica, Paolo Carloni, Mod ..., Angewandte Chemie International Edition, 2014

Abstract By combining ion‐mobility mass spectrometry experiments with sub‐millisecond classical and ab initio molecular dynamics we fully characterized, for the first time, the dynamic ensemble of a model nucleic acid in the gas phase under electrospray ionization conditions. The studied ...

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Reasons behind the Relative Abundances of Heptacoordinate Complexes along the Late First-Row Transition Metal Series

21-11-2014 | Martín Regueiro-Figueroa; Luís M. P. Lima; Víctor Blanco; David Esteban-Gómez; Andrés de Blas; Teresa Rodríguez-Blas ..., Inorganic Chemistry, 2014

A series of transition metal complexes [ML1] (H2L1 = 1,4,10-trioxa-7,13-diazacyclopentadecane-N,N′-diacetic acid, M = Co, Ni, Cu, or Zn) have been prepared and characterized. The X-ray structures of the [CoL1] and [CuL1] complexes reveal that the metal ions are seven-coordinated with a distorted ...

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Synthesis and Conformational Analysis of Hybrid α/β‐Dipeptides Incorporating S‐Glycosyl‐β2,2‐Amino Acids

20-11-2014 | Iván García‐González, Lara Mata, Francisco Corzana, Gonzalo Jiménez‐Osés, Alberto Avenoza, Jesús H. Busto, Jesús M. ..., Chemistry - A European Journal, 2014

Abstract We synthesized and carried out the conformational analysis of several hybrid dipeptides consisting of an α‐amino acid attached to a quaternary glyco‐β‐amino acid. In particular, we combined a S‐glycosylated β2,2‐amino acid and two different types of α‐amino acid, namely, aliphatic ...

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Synthesis of a Stable Selenoaldehyde by Self‐Catalyzed Thermal Dehydration of a Primary‐Alkyl‐Substituted Selenenic Acid

19-11-2014 | Shohei Sase, Ryo Kakimoto, Kei Goto, Angewandte Chemie International Edition, 2014

Abstract The unprecedented dehydration of a selenenic acid (RCH2SeOH) to a selenoaldehyde (RCHSe) has been demonstrated. A primary‐alkyl‐substituted selenenic acid was synthesized for the first time by taking advantage of a bulky cavity‐shaped substituent. Upon heating in solution, the ...

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Anomalous diffusion of Ibuprofen in cyclodextrin nanosponge hydrogels: an HRMAS NMR study

19-11-2014 | Monica Ferro, Franca Castiglione, Carlo Punta, Lucio Melone, Walter Panzeri, Barbara Rossi, Francesco Trotta and And ..., Beilstein Journal of Organic Chemistry, 2014

Abstract Ibuprofen sodium salt (IP) was encapsulated in cyclodextrin nanosponges (CDNS) obtained by cross-linking of β-cyclodextrin with ethylenediaminetetraacetic acid dianhydride (EDTAn) in two different preparations: CDNSEDTA 1:4 and 1:8, where the 1:n notation indicates the CD to EDTAn ...

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Thermal property, morphology, and hydrolysis ability of poly(lactic acid)/chitosan nanocomposites using polyethylene oxide

18-11-2014 | Nguyen Thuy Chinh, Nguyen Thi Thu Trang, Dinh Thi Mai Thanh, To Thi Xuan Hang, Nguyen Vu Giang, Pham Minh Quan, Nguy ..., Journal of Applied Polymer Science, 2014

ABSTRACT Poly(lactic acid) (PLA) and chitosan (CS) are two natural resource polymers, which have been applied widely into different fields. Polymer composites based on PLA and CS have some advantages such as good adhesion, biodegradability, biocompatibility, and high stability. They can be ...

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