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Now showing items 193 - 208 of 86128

  • N,N,N-trimethyl chitosan nanoparticles as a vitamin carrier system

    Douglas de Britto   Márcia R. de Moura   Fauze A. Aouada   Luiz H.C. Mattoso   Odílio B.G. Assis  

    There is considerable interest in incorporating stabilized vitamins into biopolymeric nanoparticles, especially in the development of carriers and active systems for pharmaceutical and food applications. Amongst biopolymer, chitosan is highly desirable owing to its good biocompatibility, biodegradability and ability to be chemically modified. In this paper, nanoparticles from three kinds of water-soluble derivative chitosan (N,N,N-trimethyl chitosan, TMC) have successfully been synthesized by ionic gelation with tripolyphosphate (TPP) anions. Combinations of concentrations of TMC and TPP have resulted in nanoparticles with varying sizes for which the capability for loading with vitamins was investigated. Zeta potential measurement and particle size analysis demonstrated that the size of the nanoparticles was optimized (196 +/- 8 nm) when the lowest TMC and TPP amounts were used, i.e., 0.86 mg mL(-1) and 0.114 mg mL(-1) respectively. As the TMC and/or the TPP concentrations increase, the resulting size of the nanoparticles increases considerably. Three different vitamins (B9, B12 and C) were tested as additives and the final system characterized in relation to size, morphology, spectroscopic and zeta potential properties. In general, the incorporation of vitamins increased all the TMC-TPP original nanoparticle sizes, reaching a maximumdiameter of 534 +/- 20 nm when loaded with vitamin C. The presence of vitamins also decreases the zeta potential, with one exception observed when using vitamin C. The preliminary results of this study suggested that all TMC/TPP nanoparticles can be successfully used as a stable medium to incorporate and transport vitamins, with potential applications in foodstuffs. (C) 2011 Elsevier Ltd. All rights reserved.
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  • A Mitsunobu reaction to functionalized cyclic and bicyclic N -arylamines

    Gill, Daniel M.   Iveson, Matthew   Collins, Ian   Jones, Alan M.  

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  • Modeling the Energy Structure of a GaN p–i–n Junction

    Manyakhin, F. I.; Mokretsova, L. O.  

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  • n\r -cluster models in a transverse magnetic field

    Zonzo G   Giampaolo S M  

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  • A Monte Carlo Study of Lambda Hyperon Polarization at BM@N

    Suvarieva, D.   Gudima, K.   Zinchenko, A.  

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  • A class of the NSVZ renormalization schemes for N=3D1 SQED

    Goriachuk, I. O.   Kataev, A. L.   Stepanyantz, K., V  

    For the N =3D 1 supersymmetric electrodynamics we investigate renormalization schemes in which the NSVZ equation relating the beta-function to the anomalous dimension of the matter superfields is valid in all loops. We demonstrate that there is an infinite set of such schemes. They are related by finite renormalizations which form a group and are parameterized by one finite function and one arbitrary constant. This implies that the NSVZ beta-function remains unbroken if the finite renormalization of the coupling constant is related to the finite renormalization of the matter superfields by a special equation derived in this paper. The arbitrary constant corresponds to the arbitrariness of choosing the renormalization point. The results are illustrated by explicit calculations in the three-loop approximation. (c) 2018 The Author(s). Published by Elsevier B.V.
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  • A lattice formulation of the ${\mathcal N}=2$ supersymmetric SYK model

    Kato, Mitsuhiro   Sakamoto, Makoto   So, Hiroto  

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  • A Monte Carlo Study of Lambda Hyperon Polarization at BM@N

    Suvarieva, D.   Gudima, K.   Zinchenko, A.  

    Heavy strange objects (hyperons) can provide essential signatures of the excited and compressed baryonic matter. At NICA, it is planned to study hyperons both in the collider mode (MPD detector) and the fixed-target one (BM@N setup). Measurements of strange hyperon polarization can give additional information on the strong interaction mechanisms. In heavy-ion collisions, such measurements are even more valuable since the polarization is expected to be sensitive to characteristics of the QCD medium (vorticity, hydrodynamic helicity) and to QCD anomalous transport. In this analysis, the possibility to measure at BM@N the polarization of the lightest strange hyperon I > is studied in Monte Carlo event samples of Au + Au collisions produced with the DCM-QGSM generator. It is shown that the detector will allow to measure polarization with a precision required to check the model predictions.
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  • A carbon tetrachloride-free synthesis of N -phenyltrifluoroacetimidoyl chloride

    Smith, Dylan G.M.   Williams, Spencer J.  

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  • Electronic intravenous N‐acetyl cysteine ordering tool: A retrospective review

    Jackson, Angela   Little, Mark  

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  • A Postal Cover from Dr. R. N. Hudson

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  • A Postal Cover from Dr. R. N. Hudson

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  • A Topographical Dictionary of Ancient Rome || N

    Platner, Samuel Ball; Ashby, Thomas  

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  • A Topographical Dictionary of Ancient Rome || N

    Platner, Samuel Ball   Ashby, Thomas  

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  • PoMiN: A Post-Minkowskian\r N\r -body Solver

    Feng Justin   Baumann Mark   Hall Bryton   Doss Joel   Spencer Lucas   Matzner Richard  

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  • Plasmon-Driven C–N Bond Cleavage Across a Series of Viologen Derivatives

    Brooks, James L.; Chulhai, Dhabih V.; Yu, Ziwei; Goodpaster, Jason D.; Frontiera, Renee R.  

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