Results 31 to 40 of about 157,527 (353)

Qualitative and quantitative phytochemical analysis of different extracts from Thymus algeriensis aerial parts [PDF]

open access: yes, 2018
This study was performed to evaluate the metabolite recovery from different extraction methods applied to Thymus algeriensis aerial parts. A high-performance liquid chromatographic method using photodiode array detector with gradient elution has been ...
Benayache, Fadila   +10 more
core   +2 more sources

Subcritical and supercritical bifurcations in axisymmetric viscoelastic pipe flows [PDF]

open access: yesJ. Fluid Mech. (2021), vol. 929, A16, 2021
Axisymmetric viscoelastic pipe flow of Oldroyd-B fluids has been recently found to be linearly unstable by Garg et al. Phys. Rev. Lett., 121.024502 (2018). From a nonlinear point of view, this means that the flow can transition to turbulence supercritically, in contrast to the subcritical Newtonian pipe flows.
arxiv   +1 more source

Carbon Dioxide, a Solvent and Synthon for Green Chemistry [PDF]

open access: yes, 2005
Carbon dioxide is a renewable resource of carbon when we consider the reuse of existing CO2 as a carbon source for producing chemicals. The development of new applications is of major interest from the point of view of carbon dioxide sequestration and ...
Ballivet-Tkatchenko, D   +2 more
core   +1 more source

Supercritical CO2 extraction of Tetraclinis articulata: chemical composition, antioxidant activity and mathematical modeling [PDF]

open access: yes, 2013
Operating conditions for extraction from the leaves of Tetraclinis articulata using supercritical carbon diox-ide (SCCO2) were studied to focus on the feasibility of obtaining volatile and nonvolatile fractions throughthe use of different extraction ...
Bouajila, Jalloul   +5 more
core   +3 more sources

Analysis of triacylglycerol and phospholipid sn‐positional isomers by liquid chromatographic and mass spectrometric methodologies

open access: yesMass Spectrometry Reviews, EarlyView., 2023
Abstract Analysis of triacylglycerol (TG) and phospholipid sn‐positional isomers can be divided into two main categories: (a) direct separation by chromatography or other means such as ion mobility mass spectrometry and (b) quantification of regioisomer ratios by structurally informative fragment ions with mass spectrometric methods.
Mikael Fabritius, Baoru Yang
wiley   +1 more source

Supercritical fluid extraction-supercritical fluid chromatography of saliva: Single-quadrupole mass spectrometry monitoring of caffeine for gastric emptying studies† [PDF]

open access: yes, 2021
Saliva is an attractive sampling matrix for measuring various endogenous and exogeneous substances but requires sample treatment prior to chromatographic analysis.
Aude, Philipp   +9 more
core   +4 more sources

Turbulent mixing of a slightly supercritical Van der Waals fluid at Low-Mach number [PDF]

open access: yesPhysics of Fluids, 26 055101 (2014), 2014
Supercritical fluids near the critical point are characterized by liquid-like densities and gas-like transport properties. These features are purposely exploited in different contexts ranging from natural products extraction/fractionation to aerospace propulsion.
arxiv   +1 more source

Comparison of Cuminaldehyde Contents from Cell Suspension Cultures and Seeds of [Bunium persicum (Boiss.) B. Fedtsch.]

open access: yesNotulae Scientia Biologicae, 2012
The cell suspension culture and seed samples of Bunium persicum were extracted by supercritical fluid, hydrodistillation and solvent methods and analyzed by Gas Chromatography.
Sara KHOSRAVINIA   +4 more
doaj   +3 more sources

Analytical and Preparative Separation of Softwood Lignans by Supercritical Fluid Chromatography

open access: yesSeparations, 2023
Lignans are widespread polyphenolic secondary plant metabolites possessing high biological activity. One of the most promising industrial-scale sources of such compounds is coniferous knotwood, containing a large number of polyphenolic compounds.
Nikolay V. Ul’yanovskii   +5 more
doaj   +1 more source

Liquid chromatographic strategies for separation of bioactive compounds in food matrices [PDF]

open access: yes, 2018
Nowadays, there is an increasing attention for nutraceuticals and, in general, bioactive compounds naturally present in food. Indeed, the possibility of preserving human health and preventing disease (e.g., cardiovascular diseases, cancer etc.) by the ...
Capriotti, Anna Laura   +5 more
core   +1 more source

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