A Bioinspired Dinickel(II) Hydrolase: Solvent Vapor-Induced Hydrolysis of Carboxyesters under Ambient Conditions

2016 ◽  
Vol 55 (24) ◽  
pp. 12696-12706 ◽  
Author(s):  
Suman K. Barman ◽  
Francesc Lloret ◽  
Rabindranath Mukherjee
Keyword(s):  
Ambient Conditions ◽  
Solvent Vapor ◽  
Hydrolysis Of

Highly efficient hydrolysis of ammonia borane by anion (−OH, F−, Cl−)-tuned interactions between reactant molecules and CoP nanoparticles

2017 ◽  
Vol 53 (4) ◽  
pp. 705-708 ◽  
Author(s):  
Zi-Cheng Fu ◽  
Yong Xu ◽  
Sharon Lai-Fung Chan ◽  
Wei-Wei Wang ◽  
Fang Li ◽  
...  
Keyword(s):  
High Performance ◽  
Ammonia Borane ◽  
Ambient Conditions ◽  
Highly Efficient ◽  
Performance System ◽  
Hydrolysis Of ◽  
Nanoparticle Catalyst

An anion-assisted hydrolytic H2-releasing ultra-high performance system involving ammonia borane and a CoP nanoparticle catalyst has been established under ambient conditions.

Dry ice-mediated rational synthesis of edge-carboxylated crumpled graphene nanosheets for selective and prompt hydrolysis of cellulose and eucalyptus lignocellulose under ambient reaction conditions

2020 ◽  
Vol 22 (16) ◽  
pp. 5437-5446 ◽  
Author(s):  
Hassan Idris Abdu ◽  
Kamel Eid ◽  
Aboubakr M. Abdullah ◽  
Mostafa H. Sliem ◽  
Ahmed Elzatahry ◽  
...  
Keyword(s):  
Graphene Nanosheets ◽  
Ambient Conditions ◽  
Selective Hydrolysis ◽  
Reaction Conditions ◽  
One Pot ◽  
Dry Ice ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Crumpled Graphene

Edge-carboxylated graphene (ECG) crumpled nanosheets with tuneable COOH content were synthesized by a facile one pot approach for selective hydrolysis of cellulose to glucose and eucalyptus to xylose and glucose under ambient conditions.

Effect of high hydrostatic pressure on the enzymic hydrolysis of β-lactoglobulin B by trypsin, thermolysin and pepsin

1996 ◽  
Vol 63 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Henrik Stapelfeldt ◽  
Per Hjort Petersen ◽  
Kristian Rotvig Kristiansen ◽  
Karsten Bruun Qvist ◽  
Leif H. Skibsted
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
High Hydrostatic Pressure ◽  
Pressure Effect ◽  
Ambient Pressure ◽  
Apparent Volume ◽  
Enzymic Hydrolysis ◽  
Ambient Conditions ◽  
Β Lactoglobulin ◽  
Hydrolysis Of

SummaryHydrolysis of β-lactoglobulin B (β-lg B) by pepsin, a process slow at ambient conditions, is facilitated at a moderately high hydrostatic pressure such as 300 MPa, corresponding to an apparent volume of activation ΔV# = −63 ml mol−1 at pH 2·5, 30 °C and Γ/2=0·16. Digestion of β-lg by trypsin and thermolysin is likewise enhanced by pressure, and the pressure effect has been traced to pressure denaturation of β-lg B, which by high-pressure fluorescence spectroscopy has been shown to have a large negative volume of reaction, ΔV° = −98 ml mol−1, at pH 6·7, 30 °C and Γ/2 = 0·16. Pressure denaturation is only slowly reversed following release of pressure and the enhanced digestibility is maintained at ambient pressure for several hours.

scholarly journals 106 Cellulose Coatings Reduce Rancidity of Pecans

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 407B-407
Author(s):  
E.A. Baldwin ◽  
Bruce W. Woods
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Free Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Oxidative Cleavage ◽  
Carya Illinoinensis ◽  
Edible Coatings ◽  
Ambient Conditions ◽  
Off Flavors ◽  
Hydrolysis Of

Pecans (Carya illinoinensis) are full of unsaturated fatty acids, which are subject to oxidative cleavage. This results in the development of rancid off-flavors, which render the nuts unmarketable. For this reason, pecans must be stored under costly refrigerated conditions. Furthermore, pecans usually undergo retail distribution and marketing at ambient conditions, which promote development of off-flavors. Application of cellulose-based edible coatings reduced off-flavor, and improved overall flavor scores while adding shine to the nuts during 14 months of storage under ambient conditions. Development of rancidity involves hydrolysis of glycerides into free fatty acids, oxidation of double bonds of unsaturated fatty acids to form peroxides and then autooxidation of the free fatty acids once the peroxides reach a sufficient level to perpetuate this reaction. One of the products of autooxidation is hexanal which is, thus, a good indicator of rancidity. Analysis of pecans by gas chromatography revealed that hexanal levels were reduced in coated nuts by 5- to over 200-fold compared to uncoated controls, depending on the coating treatment. Some of the coating treatments affected nut color, but overall flavor and appearance were improved by certain formulations.

Hydrodynamic cavitation: an emerging technology for the intensification of various chemical and physical processes in a chemical process industry

2017 ◽  
Vol 33 (5) ◽  
Author(s):  
Jitendra Carpenter ◽  
Mandar Badve ◽  
Sunil Rajoriya ◽  
Suja George ◽  
Virendra Kumar Saharan ◽  
...  
Keyword(s):  
Hot Spots ◽  
Nanoparticle Synthesis ◽  
Water Disinfection ◽  
Hydrodynamic Cavitation ◽  
Ambient Conditions ◽  
Chemical Process Industry ◽  
Biodiesel Synthesis ◽  
Temperature And Pressure ◽  
Flowing System ◽  
Hydrolysis Of

AbstractHydrodynamic cavitation (HC) has been explored by many researchers over the years after the first publication on hydrolysis of fatty oils using HC was published by Pandit and Joshi [Pandit AB, Joshi JB. Hydrolysis of fatty oils: effect of cavitation. Chem Eng Sci 1993; 48: 3440–3442]. Before this publication, most of the studies related to cavitation in hydraulic system were concentrated to avoid the generation of cavities/cavitating conditions. The fundamental concept was to harness the energy released by cavities in a positive way for various chemical and mechanical processes. In HC, cavitation is generated by a combination of flow constriction and pressure-velocity conditions, which are monitored in such a way that cavitating conditions will be reached in a flowing system and thus generate hot spots. It allows the entire process to operate at otherwise ambient conditions of temperature and pressure while generating the cavitating conditions locally. In this review paper, we have explained in detail various cavitating devices and the effect of geometrical and operating parameters that affect the cavitation conditions. The optimization of different cavitating devices is discussed, and some strategies have been suggested for designing these devices for different applications. Also, various applications of HC such as wastewater treatment, preparation of nanoemulsions, biodiesel synthesis, water disinfection, and nanoparticle synthesis were discussed in detail.

Reactivity and Stability of Superionics MSnF4 at High Temperature in Various Media

1998 ◽  
Vol 547 ◽  
Author(s):  
Georges Dénès ◽  
M. Cecilia Madamba ◽  
Abdualhafeed Muntasar
Keyword(s):  
Phase Transitions ◽  
Ambient Temperature ◽  
Fluoride Ion ◽  
Ambient Conditions ◽  
Significant Deterioration ◽  
Color Changes ◽  
Thermally Activated ◽  
The Stability ◽  
Hydrolysis Of ◽  
Potential Conditions

AbstractSuperionic MSnF4 are the highest performance fluoride ion conductors, with PbSnF4 being the best. Prototypes of devices using PbSnF4 have been constructed and tested. Since the fluoride ion mobility is thermally activated, some devices might be used more efficiently above ambient temperature. Therefore, it is of prime importance that the stability of these materials be tested under potential conditions of use, since thermal degradation and phase transitions are likely to alter the conducting properties. Tetragonal SrSnF4, α-PbSnF4 and BaSnF4, and orthorhombic o-PbSnF4, are stable at ambient conditions, even in air. However, all undergo significant deterioration when heated in air: the color changes from white to yellowish, and tin hydrolysis and oxidation takes place. They are much more stable under inert conditions (nitrogen or argon). However, PbSnF4 undergoes several phase transitions at high temperatures: o to α starting at ca. 100°C, α to β (reversible, but the reverse reaction is very sluggish) starting at 250°C, β to γ (reversible) at 390°C. β-PbSnF4 can be quenched to ambient temperature and is metastable for long times, however, eventually it starts changing to stable α-PbSnF4 and this change is uncontrollable and is faster above ambient temperature. Microcrystalline μγ-PbSnF4, obtained by ball milling any other phase of PbSnF4, gives rapidly a-PbSnF4 at 200°C. In addition, for all MSnF4, hydrolysis of the Sn-F bonds to Sn-O occurs with traces of moisture.

Inducing growth of highly ordered molybdenum oxide nanoplates under ambient conditions

2008 ◽  
Vol 23 (10) ◽  
pp. 2602-2608 ◽  
Author(s):  
Ke Shao ◽  
Hai mei Luo ◽  
Hui qun Cao
Keyword(s):  
Electron Microscopy ◽  
Molybdenum Oxide ◽  
Orthorhombic Phase ◽  
Ammonium Molybdate ◽  
Ambient Conditions ◽  
Large Area ◽  
Oriented Growth ◽  
Nanometer Materials ◽  
Transmission Electron ◽  
Hydrolysis Of

Large area uniform nanoplates of molybdenum oxide (MoO3), a typical semiconductor material, have been synthesized under soft conditions by using carboxymethyl cellulose (CMC) as template. Under ambient condition, hydrolysis of ammonium molybdate into layered molybdenum oxide, and its subsequent inclusion of CMC polymers results in formation of lamellar CMC/molybdenum oxide hybrid. Calcinations of this lamellar hybrid at 500 °C lead to formation of large area uniform nanoplates of orthorhombic phase of MoO3. Scanning electron microscopy and transmission electron microscopy images show that these MoO3 nanoplates are regularly packed, about 100 nm in thickness and 10–100 μm in length. The mechanism of the hybrid reaction and the templating ability of CMC polymers have been extensively discussed. The oriented growth of short molybdenum oxide flakes into long-range ordered plates has been induced by CMC polymers because of the shrinking of CMC during the hybrid reaction. This is the first report that large area highly ordered molybdenum oxide nanometer materials have been obtained under soft reaction conditions.

scholarly journals Flexible Sample Environment for the Investigation of Soft Matter at the European Spallation Source: Part II—The GISANS Setup

2021 ◽  
Vol 11 (9) ◽  
pp. 4036
Author(s):  
Tobias Widmann ◽  
Lucas P. Kreuzer ◽  
Matthias Kühnhammer ◽  
Andreas J. Schmid ◽  
Lars Wiehemeier ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Soft Matter ◽  
Gas Flow ◽  
Ambient Conditions ◽  
Experimental Conditions ◽  
Solvent Vapor ◽  
Spallation Source ◽  
Sample Environment

The FlexiProb project is a joint effort of three soft matter groups at the Universities of Bielefeld, Darmstadt, and Munich with scientific support from the European Spallation Source (ESS), the small-K advanced diffractometer (SKADI) beamline development group of the Jülich Centre for Neutron Science (JCNS), and the Heinz Maier-Leibnitz Zentrum (MLZ). Within this framework, a flexible and quickly interchangeable sample carrier system for small-angle neutron scattering (SANS) at the ESS was developed. In the present contribution, the development of a sample environment for the investigation of soft matter thin films with grazing-incidence small-angle neutron scattering (GISANS) is introduced. Therefore, components were assembled on an optical breadboard for the measurement of thin film samples under controlled ambient conditions, with adjustable temperature and humidity, as well as the optional in situ recording of the film thickness via spectral reflectance. Samples were placed in a 3D-printed spherical humidity metal chamber, which enabled the accurate control of experimental conditions via water-heated channels within its walls. A separately heated gas flow stream supplied an adjustable flow of dry or saturated solvent vapor. First test experiments proved the concept of the setup and respective component functionality.

Colorimetric detection of glyphosate: towards a handmade and portable analyzer

2020 ◽  
Vol 92 (4) ◽  
pp. 601-616
Author(s):  
Renata Hellinger ◽  
Valmir B. Silva ◽  
Elisa S. Orth
Keyword(s):  
Colorimetric Detection ◽  
Major Product ◽  
Field Analysis ◽  
Ambient Conditions ◽  
Time Analysis ◽  
Main Challenge ◽  
Colored Product ◽  
Hydrolysis Of ◽  
Colorimetric Reaction ◽  
Derivatization Reaction

AbstractGlyphosate (GFT) is a widely used herbicide, considered toxic and a probable carcinogen. The main challenge is its detection, usually requiring expensive and laborious methodologies. Herein, we report a colorimetric detection of GFT, using a derivatization reaction with 2,4-dinitrofluorobenzene (DNFB) that leads to a yellow-colored product. This is undertaken under mild conditions (weakly basic aqueous medium and ambient conditions). A thorough kinetic study was carried out, showing that the derivatization reaction with GFT predominates over the hydrolysis of DNFB. Hence, the colorimetric product is the major product formed, which was fully characterized by nuclear magnetic resonance. Finally, a portable, handmade and cheap colorimeter was used to detect and quantify GFT, relying on the colorimetric reaction proposed. Simulating real contaminated samples, it was possible to analyze in just 10 min, with less than 7 % of error of the nominal concentration. Overall, a highly sustainable approach is shown for an herbicide monitoring, with a simple and mild derivatization reaction that does not require purification and leads to a colorimetric product. Moreover, a simple apparatus with low time analysis is proposed that uses a problematic electronic trash: cellphone chargers. This cheapens the process and allows field analysis that can be extended to other agrochemicals.

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