Simultaneous determination of multiple transport properties over a wide range of temperatures and pressures from the analysis of non-equilibrium fluctuations by the shadowgraph method

2020 ◽  
Vol 153 (14) ◽  
pp. 144201
Author(s):  
W. Wu ◽  
J. H. Jander ◽  
M. H. Rausch ◽  
A. P. Fröba ◽  
C. Giraudet
Keyword(s):  
Transport Properties ◽  
Simultaneous Determination ◽  
Equilibrium Fluctuations ◽  
Wide Range ◽  
Non Equilibrium

scholarly journals Shadowgraph Analysis of Non-equilibrium Fluctuations for Measuring Transport Properties in Microgravity in the GRADFLEX Experiment

2016 ◽  
Vol 28 (4) ◽  
pp. 467-475 ◽  
Author(s):  
Fabrizio Croccolo ◽  
Cédric Giraudet ◽  
Henri Bataller ◽  
Roberto Cerbino ◽  
Alberto Vailati
Keyword(s):  
Transport Properties ◽  
Equilibrium Fluctuations ◽  
Non Equilibrium

scholarly journals One-Single Extraction Procedure for the Simultaneous Determination of a Wide Range of Polar and Nonpolar Organic Contaminants in Seawater

2018 ◽  
Vol 5 ◽  
Author(s):  
Vincent Fauvelle ◽  
Javier Castro-Jiménez ◽  
Natascha Schmidt ◽  
Benoit Carlez ◽  
Christos Panagiotopoulos ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Organic Contaminants ◽  
Extraction Procedure ◽  
Single Extraction ◽  
Wide Range ◽  
Nonpolar Organic

Simultaneous Determination of Saponins and a Flavonoid from Aerial Parts of Zygophyllum coccineum L.

2012 ◽  
Vol 95 (3) ◽  
pp. 757-762
Author(s):  
Elham Amin ◽  
Yan-Hong Wang ◽  
Bharathi Avula ◽  
Seham S El-Hawary ◽  
Magda M Fathy ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Relevant Literature ◽  
Hplc Method ◽  
Desert Plant ◽  
Gradient System ◽  
Alcohol Extract ◽  
Triterpenoid Saponins ◽  
Wide Range ◽  
Acquity Uplc

Abstract Triterpenoid saponins are a class of glycosides with a wide range of bioactivities, which make them interesting research candidates. Zygophyllum coccineum is an Egyptian desert plant rich in triterpenoid saponins. Reviewing the relevant literature, no data concerning the HPLC or ultra-performance LC (UPLC) analysis of Zygophyllum content were found. This paper presents two methods, HPLC-UV and UPLC-UV-evaporative light scattering detector (ELSD)/MS, for the simultaneous determination of 10 compounds in the alcohol extract of Z. coccineum. The HPLC method uses a C18 column and water–acetonitrile (both containing 0.1% trifluoroacetic acid) gradient system. The separation was achieved within 32 min. The developed UPLC method simultaneously detects and quantifies the 10 compounds using an Acquity UPLC BEH Shield RP18 column and reagent alcohol–acetonitrile (80/20, v/v) and water (both containing 0.5% formic acid) gradient system within 14 min with UV, ELS, and MS detectors. The methods were used to analyze another species, Z. simplex, and results revealed a great variation between the secondary metabolite pattern of both species.

A Direct Carrier Distillation Procedure for the spectrographic Determination of Impurities in Uranium Tetrafluoride

1974 ◽  
Vol 28 (6) ◽  
pp. 564-568 ◽  
Author(s):  
L. S. Dale
Keyword(s):  
Simultaneous Determination ◽  
Spectral Interference ◽  
Lead Chloride ◽  
Internal Standards ◽  
Spectrographic Determination ◽  
Uranium Tetrafluoride ◽  
Coefficients Of Variation ◽  
Wide Range ◽  
Determination Of Impurities

A direct carrier distillation procedure for the determination of a wide range of impurities in uranium tetrafluoride is described. The method is based on the use of lead chloride as carrier with yttrium oxide to suppress uranium spectral interference. A deep crater electrode further aids in the reduction of spectral interference. Germanium and cobalt are used as internal standards. The method has been adopted for the simultaneous determination of Ag, l, B, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, Si, Sn, Ti, V, and Zn with detection limits in the range 0.1 to 20 ppm and coefficients of variation ranging from 4 to 15%.

scholarly journals Centrifuge experiments for the determination of the moisture storage and transport properties in the overhygroscopic range

2019 ◽  
Vol 282 ◽  
pp. 02035
Author(s):  
Evy Vereecken ◽  
Staf Roels ◽  
Hans Janssen
Keyword(s):  
Transport Properties ◽  
Simultaneous Determination ◽  
Theoretical Point ◽  
Moisture Retention ◽  
Reliable Determination ◽  
Retention Curve ◽  
Centrifuge Method ◽  
Moisture Permeability ◽  
Moisture Storage

This study explores the potential of a centrifuge experiment for hygric property determination. In this method, a core sample is placed in a tube which is spun at different rotational speeds to create a distribution of moisture contents and capillary pressures. This way, a simultaneous determination of the moisture retention curve and moisture permeability curve is possible. Measurements performed in the petroleum industry and in soil science already showed the technique to be an appropriate substitute for the pressure plate method. In building physics, the potential of the centrifuge method is currently still unexplored. Therefore, in this study, preliminary desorption measurements on brick samples are performed. To infer the moisture retention curve, an approximate data analysis method is applied. This approach is compared to a more sophisticated parameter estimation technique, which is also used to infer the moisture permeability curve. From a theoretical point of view, the centrifuge method allows a simultaneous determination of the moisture storage and transport properties of building materials. In practice, however, experimental inaccuracies make the experimental results unusable for a reliable determination of the moisture transport properties.

scholarly journals Simultaneous Determination of 6-Shogaol and 6-Gingerol in Various Ginger (Zingiber officinale Roscoe) Extracts and Commercial Formulations Using a Green RP-HPTLC-Densitometry Method

Foods ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1136 ◽  
Author(s):  
Ahmed I. Foudah ◽  
Faiyaz Shakeel ◽  
Hasan S. Yusufoglu ◽  
Samir A. Ross ◽  
Prawez Alam
Keyword(s):  
Simultaneous Determination ◽  
Reversed Phase ◽  
Simultaneous Analysis ◽  
Green Solvents ◽  
Analytical Technique ◽  
Simultaneous Quantification ◽  
Wide Range ◽  
Ginger Rhizome ◽  
Ginger Powder

Various analytical methodologies have been reported for the determination of 6-shogaol (6-SHO) and 6-gingerol (6-GIN) in ginger extracts and commercial formulations. However, green analytical methods for the determination of 6-SHO and 6-GIN, either alone or in combination, have not yet been reported in literature. Hence, the present study was aimed to develop a rapid, simple, and cheaper green reversed phase high-performance thin-layer chromatography (RP-HPTLC) densitometry method for the simultaneous determination of 6-SHO and 6-GIN in the traditional and ultrasonication-assisted extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas. The simultaneous analysis of 6-SHO and 6-GIN was carried out via RP-18 silica gel 60 F254S HPTLC plates. The mixture of green solvents, i.e., ethanol:water (6.5:3.5 v/v) was utilized as a mobile phase for the simultaneous analysis of 6-SHO and 6-GIN. The analysis of 6-SHO and 6-GIN was performed at λmax = 200 nm for 6-SHO and 6-GIN. The densitograms of 6-SHO and 6-GIN from traditional and ultrasonication-assisted extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas were verified by obtaining their single band at Rf = 0.36 ± 0.01 for 6-SHO and Rf = 0.53 ± 0.01 for 6-GIN, compared to standard 6-SHO and 6-GIN. The green RP-HPTLC method was found to be linear, in the range of 100–700 ng/band with R2 = 0.9988 for 6-SHO and 50–600 ng/band with R2 = 0.9995 for 6-GIN. In addition, the method was recorded as “accurate, precise, robust and sensitive” for the simultaneous quantification of 6-SHO and 6-GIN in traditional and ultrasonication-assisted extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas. The amount of 6-SHO in traditional extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas was obtained as 12.1, 17.9, 10.5, and 9.6 mg/g of extract, respectively. However, the amount of 6-SHO in ultrasonication-assisted extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas were obtained as 14.6, 19.7, 11.6, and 10.7 mg/g of extract, respectively. The amount of 6-GIN in traditional extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas were found as 10.2, 15.1, 7.3, and 6.9 mg/g of extract, respectively. However, the amount of 6-GIN in ultrasonication-assisted extracts of ginger rhizome, commercial ginger powder, commercial capsules, and commercial ginger teas were obtained as 12.7, 17.8, 8.8, and 7.9 mg/g of extract, respectively. Overall, the results of this study indicated that the proposed analytical technique could be effectively used for the simultaneous quantification of 6-SHO and 6-GIN in a wide range of plant extracts and commercial formulations.

scholarly journals Method Development and Validation for the Simultaneous Determination of Four Coumarins in Saussurea superba by Capillary Zone Electrophoresis

2010 ◽  
Vol 93 (5) ◽  
pp. 1410-1415 ◽  
Author(s):  
Juan Chen ◽  
Li Chen ◽  
Hong-Li Zhang ◽  
Yan-Ping Shi
Keyword(s):  
Simultaneous Determination ◽  
Applied Voltage ◽  
Method Development ◽  
Migration Behavior ◽  
Electrophoretic Method ◽  
Wide Range ◽  
Method Development And Validation ◽  
Capillary Zone ◽  
Development And Validation

Abstract A capillary zone electrophoretic method has been developed for the determination of four coumarinsskimmin, scopolin, scopoletin, and umbelliferonein Saussurea superba with UV detection at 254 nm. The capillary temperature was kept constant at 25°C. Effects of buffer pH, electrolyte concentration, organic modifier, and applied voltage on migration behavior were studied systematically. The optimum conditions for separation were achieved by using 30 mM borate buffer at pH 9.02 containing 15% (v/v) methanol as the electrolyte and 25 kV as the applied voltage. For all analytes a good linear regression relationship (r >0.999) was obtained between peak area and concentration over a relatively wide range. The method was validated for repeatability, precision, and accuracy. The validated method was successfully applied to the simultaneous determination of the four analytes in S. superba.

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