The OV 275-packed stainless steel column intrans-fatty acid research: A note of caution

Lipids ◽  
1981 ◽  
Vol 16 (6) ◽  
pp. 468-471 ◽  
Author(s):  
Brian L. Walker
Keyword(s):  
Stainless Steel ◽  
Fatty Acid ◽  
Steel Column ◽  
Stainless Steel Column

Experimental Investigation Into Creep Buckling of a Stainless Steel Plate Column Under Axial Compression at Extremely High Temperatures

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Byeongnam Jo ◽  
Koji Okamoto
Keyword(s):  
Stainless Steel ◽  
High Temperatures ◽  
High Speed ◽  
Failure Time ◽  
Empirical Correlation ◽  
Buckling Behavior ◽  
Creep Buckling ◽  
Steel Column ◽  
Stainless Steel Column ◽  
Buckling Failure

This study aims to investigate the creep buckling behavior of a stainless steel column under axial compressive loading at extremely high temperatures. Creep buckling failure time of a slender column with a rectangular cross section was experimentally measured under three different temperature conditions, namely, 800, 900, and 1000 °C. At each temperature, axial compressive loads with magnitudes ranging between 15% and 80% of the buckling loads were applied to the top of the column, and the creep buckling failure time was measured to examine its relationship with the compressive load. The stainless steel column was found to fail within a relatively short time compared to that of creep deformation under tensile loading. An increase in the temperature of the column was found to accelerate creep buckling failure. The in-plane and out-of-plane column displacements, which respectively, corresponded to the axial and lateral displacements, were monitored during the entire experiment. The creep buckling behavior of the column was also visualized by a high-speed camera. Based on the Larson–Miller parameters (LMP) determined from the experimental results, an empirical correlation for predicting the creep buckling failure time was developed. Another empirical correlation for predicting the creep buckling failure time based on the lateral deflection rate was also derived.

DETERMINATION OF MICRO QUANTITIES OF ANDROSTERONE, AETIOCHOLANOLONE AND DEHYDROEPIANDROSTERONE BY GAS-LIQUID CHROMATOGRAPHY

1964 ◽  
Vol 45 (4_Suppl) ◽  
pp. S71-S80 ◽  
Author(s):  
John T. France ◽  
Neal L. McNiven ◽  
Ralph I. Dorfman
Keyword(s):  
Stainless Steel ◽  
Liquid Chromatography ◽  
Trimethylsilyl Ether ◽  
Nitrogen Pressure ◽  
Gas Liquid Chromatography ◽  
Column Temperature ◽  
Steel Column ◽  
Stainless Steel Column ◽  
Reproducible Method

ABSTRACT A convenient, sensitive and reproducible method for the determination of androsterone, aetiocholanolone and dehydroepiandrosterone, as their trimethylsilyl ether derivatives, has been described. The conditions include: 3.3 % XE-60 on Anakrom ABS (90-100 mesh), 6 ft. × 3.8 mm i. d. stainless steel column, 225° column temperature, 327° vaporizer temperature, nitrogen pressure 11.0 p. s. i. (34 ml/min flow). The % variation between duplicate samples for androsterone, aetiocholanolone and dehydroepiandrosterone respectively was 1.5, 4.5 and 1.8 at the 0.3 μg level. Quantitation at the 0.05 μg level appears possible.

scholarly journals Stainless-Steel Column for Robust, High-Temperature Microchip Gas Chromatography

2018 ◽  
Vol 91 (1) ◽  
pp. 792-796 ◽  
Author(s):  
Abhijit Ghosh ◽  
Austin R. Foster ◽  
Jacob C. Johnson ◽  
Carlos R. Vilorio ◽  
Luke T. Tolley ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Stainless Steel ◽  
High Temperature ◽  
Steel Column ◽  
Stainless Steel Column

Gas-Liquid Chromatographic Determination of Chloroform in Toothpastes, Using the Headspace Analytical Technique

1974 ◽  
Vol 57 (3) ◽  
pp. 560-562
Author(s):  
Martin J Stutsman
Keyword(s):  
Stainless Steel ◽  
Liquid Chromatography ◽  
Chromatographic Determination ◽  
Gas Liquid Chromatography ◽  
Analytical Technique ◽  
Steel Column ◽  
Stainless Steel Column ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract Chloroform in toothpastes is determined by gas-liquid chromatography of the vapors in the headspace over a diluted sample, using an electron capture detector. The method is sensitive to small amounts of chloroform and avoids the injection of materials deleterious to the column. The 12' × 1/8" od stainless steel column is packed with acid-washed Gas-Chrom R coated with 2 0% Carbowax 20M. Recoveries of chloroform added to toothpastes range from 95 to 104%.

scholarly journals Quantitative Analysis of Resorcinol from Marketed Hair Tonic Using Liquid Chromatographic Technique

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Amit Kumar De ◽  
Partha Pratim Chowdhury ◽  
Shyamaprasad Chattapadhyay
Keyword(s):  
Stainless Steel ◽  
Quantitative Analysis ◽  
Mobile Phase ◽  
Quantitative Estimation ◽  
Accurate Estimation ◽  
Internal Diameter ◽  
Chromatographic Technique ◽  
Steel Column ◽  
Stainless Steel Column ◽  
Liquid Chromatographic

Quantitative estimation of resorcinol from marketed pharmaceutical formulation has been reported in this study. Resorcinol as a pharmaceutical ingredient has a broad spectrum of application but its application is limited due to its toxic side effects. Method for the accurate estimation of resorcinol is therefore essential. In the current study we have developed a chromatographic technique for its estimation from a marketed hair tonic meant for the treatment of several dermatological diseases of the scalp. A stainless steel column 25 cm in length and 4 mm internal diameter packed with octadecylsilane (5 µm) was used for this purpose. The mobile phase was a mixture of phosphate buffer of pH 2.8 and acetonitrile. The flow rate was 0.6 mL·min−1 and the detection wavelength was 280 nm. The method was found to be linear between concentration range 10.28 µg·mL−1 to 71.96 µg·mL−1 with r2 value 0.999. The accuracy of the method and the intraday and interday precession study presents the applicability of the method for the estimation of resorcinol from any pharmaceutical and cosmetic product containing resorcinol.

scholarly journals Extraction Efficiency of a Commercial Espresso Machine Compared to a Stainless-Steel Column Pressurized Hot Water Extraction (PHWE) System for the Determination of 23 Pharmaceuticals, Antibiotics and Hormones in Sewage Sludge

2019 ◽  
Vol 9 (7) ◽  
pp. 1509 ◽  
Author(s):  
Ola Svahn ◽  
Erland Björklund
Keyword(s):  
Stainless Steel ◽  
Sewage Sludge ◽  
Extraction Efficiency ◽  
Chemical Properties ◽  
Hot Water ◽  
Water Extraction ◽  
Hot Water Extraction ◽  
Pressurized Hot Water Extraction ◽  
Steel Column ◽  
Stainless Steel Column

Two green chemistry extraction systems, an in-house stainless-steel column Pressurized Hot Water Extraction system (PHWE) and a commercially available Espresso machine were applied for analysing 23 active pharmaceutical ingredients (APIs) in sewage sludge. Final analysis was performed on UPLC-MS/MS using two different chromatographic methods: acid and basic. When analysing all 23 APIs in sewage sludge both extraction methods showed good repeatability. The PHWE method allowed for a more complete extraction of APIs that were more tightly bound to the matrix, as exemplified by much higher concentrations of e.g., ketoconazole, citalopram and ciprofloxacin. In total, 19 out of 23 investigated APIs were quantified in sewage sludge, and with a few exceptions the PHWE method was more exhaustive. Mean absolute recoveries of 7 spiked labelled APIs were lower for the PHWE method than the Espresso method. Under acid chromatographic conditions mean recoveries were 16% and 24%, respectively, but increased to 24% and 37% under basic conditions. The difference between the PHWE method and the Espresso method might be interpreted as the Espresso method giving higher extraction efficiency; however, TIC scans of extracts revealed a much higher matrix co-extraction for the PHWE method. Attempts were made to correlate occurrence of compounds in sewage sludge with chemical properties of the 23 APIs and there are strong indications that both the number of aromatic rings and the presence of a positive charge is important for the sorption processes to sewage sludge.

Electrospray ionization mass spectrometry fingerprinting of Brazilian cachaças produced in copper alembic and in stainless-steel column stills

2012 ◽  
Vol 235 (5) ◽  
pp. 853-859 ◽  
Author(s):  
Andrea Carrara Geöcze ◽  
Evelyn de Souza Oliveira ◽  
Katalin Carrara Geöcze ◽  
Raquel Mendonça Alvarenga ◽  
Marcus H. Canuto ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Stainless Steel ◽  
Electrospray Ionization ◽  
Electrospray Ionization Mass Spectrometry ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Steel Column ◽  
Stainless Steel Column

Preparation and evaluation of a green solvent-based molecularly imprinted monolithic column for the recognition of proteins by high-performance liquid chromatography

The Analyst ◽  
2019 ◽  
Vol 144 (21) ◽  
pp. 6327-6333 ◽  
Author(s):  
Wanwan Ma ◽  
Yena An ◽  
Kyung Ho Row
Keyword(s):  
Stainless Steel ◽  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Monolithic Column ◽  
Deep Eutectic Solvents ◽  
Green Solvent ◽  
Molecularly Imprinted ◽  
Steel Column ◽  
Stainless Steel Column ◽  
Preparation And Evaluation

A protein-based molecularly imprinted monolithic column was synthesized based on ionic liquids (ILs) and deep eutectic solvents (DESs) in a stainless steel column (50 mm × 4.6 mm id).

Gas Chromatographic Determination of Pyrrolidonecarboxylic Acid

1970 ◽  
Vol 53 (4) ◽  
pp. 716-719
Author(s):  
C Y Lee
Keyword(s):  
Stainless Steel ◽  
Analytical Method ◽  
Chromatographic Determination ◽  
Gas Liquid Chromatography ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Extraction Apparatus ◽  
Steel Column ◽  
Stainless Steel Column

Abstract An analytical method is described for analysis of 2-pyrroIidone-5-carboxylic acid (PCA) in foods. PCA was extracted with ethyl acetate, using a modified Widmark extraction apparatus, and then silylated with trimethylchlorosilane and hexamethyldisilazane in the presence of pyridine. The trimethylsilylated PCA derivative was separated by gas-liquid chromatography on a 6′ × 1/4″ °d stainless steel column of 3% SE-30 on Gas Chrom Q and detected with a flame ionization detector. Recovery of PCA was 94-108%. This procedure is a relatively simple and rapid analytical method as compared to the conventional methods.

scholarly journals Direct Gas Chromatographic Analysis of Molasses and Fermented Mash

1969 ◽  
Vol 60 (4) ◽  
pp. 585-591
Author(s):  
Eduardo Rosado ◽  
H. Batiz
Keyword(s):  
Stainless Steel ◽  
Stationary Phase ◽  
Chromatographic Analysis ◽  
Suspended Solids ◽  
Direct Analysis ◽  
Chromatographic System ◽  
Gas Chromatographic Analysis ◽  
Steel Column ◽  
Stainless Steel Column

A gas chromatographic system of a 118 ft x 1/8 in o.d. stainless steel column of 5% Carbowax 20M and Chromosorb W, a/w 60/80 mesh, a glass precolumn 6 in x 1/8 in o.d. with the same stationary phase and an external dismountable injection trap was constructed and pretested for the direct analysis of fermented mash. Thirty four peaks were detected of which 14 were identified. This technique can be applied to analysis of slops or similar mixtures with suspended solids.

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