<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kapoor, Iti</style></author><author><style face="normal" font="default" size="100%">Schoen, Eva-Maria</style></author><author><style face="normal" font="default" size="100%">Bachl, Jurgen</style></author><author><style face="normal" font="default" size="100%">Kuehbeck, Dennis</style></author><author><style face="normal" font="default" size="100%">Cativiela, Carlos</style></author><author><style face="normal" font="default" size="100%">Saha, Subhadeep</style></author><author><style face="normal" font="default" size="100%">Banerjee, Rahul</style></author><author><style face="normal" font="default" size="100%">Roelens, Stefano</style></author><author><style face="normal" font="default" size="100%">Juan Marrero-Tellado, Jose</style></author><author><style face="normal" font="default" size="100%">Diaz, David Diaz</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Competition between gelation and crystallisation of a peculiar multicomponent liquid system based on ammonium salts</style></title><secondary-title><style face="normal" font="default" size="100%">Soft Matter</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">12</style></number><publisher><style face="normal" font="default" size="100%">ROYAL SOC CHEMISTRY</style></publisher><pub-location><style face="normal" font="default" size="100%">THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND</style></pub-location><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">3446-3456</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;An exemplar competition between gelation and crystallisation phenomena was examined with an unusual synergistic multicomponent (organo) gelator solution (MGS), which consists of a well-defined methanolic solution of (1R, 2R)-1,2-diaminocyclohexane L-tartrate containing 2.4 equiv. of concentrated hydrochloric acid. The optimal composition of the MGS was determined through meticulous solubility, gelation and structural studies, which support a transient gelation mechanism based on the kinetic self-assembly of the tartrate salt driven by hydrogen-bonding interactions, involving ammonium nitrogen donors and hydroxyl oxygen acceptors, and electrostatic interactions. The hydrochloric acid is involved in the solubilisation of the salt through an ionic dissociation-exchange process, which ends up with the formation-precipitation of (1R, 2R)-1,2-diaminocyclohexane dihydrochloride. As a consequence, an irreversible destruction of the gel takes place, which indicates the metastable nature of this phase that cannot be accessed from the thermodynamically equilibrated state. Gelation of a variety of oxygenated and nitrogenated solvents with moderate polarity occurred efficiently using extremely low MGS concentrations at low temperatures, and the gel phase was confirmed by dynamic rheological measurements. Several features make the described MGS unique: (1) it is a multicomponent solution where each component and its stoichiometry play a key role in the reproducible formation and stabilization of the gels; (2) it is formed by simple, small, and commercially available chiral building blocks (dissolved in a well-defined solvent system), which are easily amenable for further modifications; (3) the gelation phenomenon takes place efficiently at low temperature upon warming up the isotropic solution, conversely to the typical gel preparation protocol; and (4) the formed organogels are not thermoreversible despite the non-covalent interactions that characterize the 3D-network.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">12</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">3.909</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kuehbeck, Dennis</style></author><author><style face="normal" font="default" size="100%">Dhar, Basab Bijayi</style></author><author><style face="normal" font="default" size="100%">Schoen, Eva-Maria</style></author><author><style face="normal" font="default" size="100%">Cativiela, Carlos</style></author><author><style face="normal" font="default" size="100%">Gotor-Fernandez, Vicente</style></author><author><style face="normal" font="default" size="100%">Diaz, David Diaz</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">C-C Bond formation catalyzed by natural gelatin and collagen proteins</style></title><secondary-title><style face="normal" font="default" size="100%">Beilstein Journal of Organic Chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">biocatalysis</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon-carbon bond formation</style></keyword><keyword><style  face="normal" font="default" size="100%">gelatin</style></keyword><keyword><style  face="normal" font="default" size="100%">Henry reaction</style></keyword><keyword><style  face="normal" font="default" size="100%">protein</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">JUN</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">BEILSTEIN-INSTITUT</style></publisher><pub-location><style face="normal" font="default" size="100%">TRAKEHNER STRASSE 7-9, FRANKFURT AM MAIN, 60487, GERMANY</style></pub-location><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">1111-1118</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The activity of gelatin and collagen proteins towards C-C bond formation via Henry (nitroaldol) reaction between aldehydes and nitroalkanes is demonstrated for the first time. Among other variables, protein source, physical state and chemical modification influence product yield and kinetics, affording the nitroaldol products in both aqueous and organic media under mild conditions. Significantly, the scale-up of the process between 4-nitrobenzaldehyde and nitromethane is successfully achieved at 1 g scale and in good yield. A comparative kinetic study with other biocatalysts shows an increase of the first-order rate constant in the order chitosan &amp;lt; gelatin &amp;lt; bovine serum albumin (BSA) &amp;lt; collagen. The results of this study indicate that simple edible gelatin can promote C-C bond forming reactions under physiological conditions, which may have important implications from a metabolic perspective.&lt;/p&gt;</style></abstract><custom3><style face="normal" font="default" size="100%">Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">2.803
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