Results 91 to 100 of about 153,377 (362)
Molecules, 2018 Two different extraction methods were used for a comparative study of essential oils obtained from the Humulus lupulus scCO2 (sc-supercritical) extract: microwave-assisted hydrodistillation (MAHD) and conventional hydrodistillation (HD). As a result, the
Katarzyna Tyśkiewicz +4 more
doaj +1 more source
Configurational and Vibrational Entropy in Hydrogen-bonded Fluids [PDF]
arXiv, 2023 The thermodynamics of liquids and supercritical fluids is notorious for eluding a general theory, as can be done for crystalline solids on the basis of phonons and crystal symmetry. The extension of solid state notions such as configurational entropy and phonons to the liquid state remains an intriguing but challenging topic.
arxiv
Hydrodynamic anomalies in supercritical fluid [PDF]
J. Chem. Phys. 141, 124509 (2014), 2014 Using the molecular dynamics simulations we investigate properties of velocity autocorrelation function of Lennard-Jones fluid at long and intermediate time scales in wide ranges of temperature and density. We show that the amplitudes of the leading and subleading VAF time asymptotes, $a_1$ and $a_2$, show essentially non monotonous temperature and ...
arxiv +1 more source
Supercritical fluid chromatography coupled to mass spectrometry for lipidomics.
Journal of Mass Spectrometry, 2019 Supercritical fluid chromatography (SFC) has experienced a particular revival in recent years thanks to the development of robust and efficient commercial systems.
Céline Chollet +8 more
semanticscholar +1 more source
Plastic recycling: Challenges and opportunities
The Canadian Journal of Chemical Engineering, EarlyView.Abstract This review offers an in‐depth exploration of current strategies for recycling plastic waste, focusing on mechanical, chemical, and energy recovery methods. It situates these strategies within the context of modern practices by examining ongoing research methodologies and specific case studies related to various types of plastic waste.
Pradeep Sambyal +6 more
wiley +1 more source
CHIMIA, 1991 Five different polymer stationary phases with (+)-(R)-N-(1-phenylethyl)-N?-[3-(diethoxymethylsilyl)propyl]urea as the chiral selector have been synthesized and tested for direct enantiomer separation in capillary gas and supercritical fluid ...
André Marti +3 more
doaj +2 more sources
Synthetic Lignin Oligomers: Analytical Techniques, Challenges, and Opportunities
ChemSusChem, EarlyView.The review begins by discussing lignin and its structural complexity, followed by challenges in elucidating depolymerization products and the analytical techniques used. It then focuses on the chemical structure of synthetic lignin oligomers, their synthesis mechanisms, and their significance in current science. Finally, scientific gaps are identified,
Myriam Rojas +4 more
wiley +1 more source
Nutritional value of cruciferous oilseed crops in relation to profile of accumulated biomolecules with especial regard to glucosinolates transformation products [PDF]
, 2007 Cruciferous oilseed crops accumulate relatively high concentrations of nutritional high quality oil and proteins in their seeds. In addition to these major seed components, their co-occurrence with high concentrations of dietary fibre (DF) and various ...
Bellostas, Natalia +5 more
core
One‐Pot Depolymerization of Mixed Plastics Using a Dual Enzyme System
ChemSusChem, EarlyView.The concurrent depolymerization of a polymer blend comprising three hydrolyzable plastics is demonstrated by employing an esterase and a urethanase in a sequential one‐pot process. The reaction resulted in a depolymerization degree of around 40 %, which corresponds to a minimum monomer yield of 3 % for 4,4′‐methylenedianiline (MDA) and a maximum of 55 %
Yannick Branson +12 more
wiley +1 more source
Sustainable Synthesis of 1,2,3‐Triazoles using Cyrene as a Biodegradable Solvent in Click Chemistry
ChemSusChem, EarlyView.Green triazoles: The first successful synthesis of 1,2,3‐triazoles using Cyrene as a biodegradable and non‐toxic solvent in click chemistry has been developed. This sustainable approach allows product isolation by simple precipitation in water, eliminating the need for organic solvent extractions and chromatographic purifications, thus minimizing waste
Andrea Citarella +4 more
wiley +1 more source