Preparation and Evaluation of a Water-Soluble Cholesterol Standard

1974 ◽  
Vol 20 (4) ◽  
pp. 482-485 ◽  
Author(s):  
Bernard Klein ◽  
Norman B Kleinman ◽  
James A Foreman
Keyword(s):  
Aqueous Solutions ◽  
Water Soluble ◽  
Organic Salts ◽  
Cholesteryl Hemisuccinate ◽  
Preparation And Evaluation ◽  
Analytical Reference ◽  
Inorganic And Organic

Abstract We synthesized some inorganic and organic salts of cholesteryl hemisuccinate. Aqueous solutions of the morpholine salt, at concentrations equivalent to 400 mg of cholesterol per deciliter, have been evaluated as aqueous cholesterol standards and compared to alcoholic cholesterol solutions in analyses for cholesterol in serum, as performed by two analytical reference procedures. No significant differences were found. The usefulness of solutions of this salt as additives for serum controls or recovery studies has been also demonstrated.

Preparation and Evaluation of Skeletal Cobalt-Molybdenum Hydrodesulfurization Catalysts

1995 ◽  
Vol 60 (4) ◽  
pp. 568-575
Author(s):  
Karel Sporka ◽  
Jiří Hanika ◽  
Vladimír Jůn
Keyword(s):  
Aqueous Solutions ◽  
Active Component ◽  
Catalyst Activity ◽  
Gas Oil ◽  
Gamma Alumina ◽  
Molybdenum Sulfides ◽  
Hydrodesulfurization Catalysts ◽  
Hds Catalysts ◽  
Kinetics Of ◽  
Preparation And Evaluation

Preparation of skeletal Co-Mo catalysts by controlled impregnation of aluminosilicate skeletons containing deposited gamma-alumina with aqueous solutions of active component precursors has been investigated. The activity of the laboratory catalysts in gas oil hydrodesulfurization has been determined. Kinetics of impregnation of skeletal supports, the effect of their type, and the dependence of catalyst activity on the content of cobalt and molybdenum sulfides are reported. HDS skeletal catalysts prepared were compared with the extruded types. It was found that skeletal HDS catalysts show the higher activity (related to the content of alumina and Co-Mo sulfides) than the extruded ones due to the less significant effect of internal diffusion. However, if the activity is related to the same volume of catalyst bed, the activity of skeletal catalysts is only one fourth of that of the extruded types.

THE SOLUBLE PROTEINS OF THE MUSCLE TISSUE OF THE HADDOCK

1931 ◽  
Vol 6 (1) ◽  
pp. 1-11 ◽  
Author(s):  
J. F. LOGAN
Keyword(s):  
Sodium Chloride ◽  
Aqueous Solutions ◽  
Muscle Tissue ◽  
Soluble Protein ◽  
Potassium Phosphate ◽  
Extraction Methods ◽  
Water Soluble ◽  
Tabular Form ◽  
Water Soluble Protein ◽  
Isoelectric Points

As a contribution to the chemistry of muscle tissue, the solubility of the protein of haddock muscle in aqueous solutions of sodium chloride and neutral potassium phosphate, respectively, was determined. The results are expressed in tabular form and graphically in the form of solubility curves. A water-soluble protein and also a salt-soluble protein were isolated from dialyzed haddock muscle by extraction methods. These proteins were obtained in a comparatively pure condition by precipitation from solution in the region of their isoelectric points.

PROGRESS IN THE ANALYSIS OF INORGANIC AND ORGANIC COMPOUNDS IN NON-AQUEOUS SOLUTIONS

1962 ◽  
Vol 31 (4) ◽  
pp. 244-266 ◽  
Author(s):  
A P Kreshkov ◽  
L N Bykova ◽  
N A Kazaryan ◽  
N Sh Aldarova
Keyword(s):  
Aqueous Solutions ◽  
Organic Compounds ◽  
Inorganic And Organic

Application of a synthetic water-soluble poly( N -maleyl glycine- co -acrylamide) as polychelatogen for inorganic ions in aqueous solutions

1998 ◽  
Vol 41 (6) ◽  
pp. 687-694 ◽  
Author(s):  
G. del C. Pizarro ◽  
O. G. Marambio ◽  
B. L. Rivas ◽  
K. E. Geckeler
Keyword(s):  
Aqueous Solutions ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Soluble Poly ◽  
Synthetic Water

THE WATER-SOLUBLE POLYSACCHARIDES OF DERMATOPHYTES: IV. GALACTOMANNANS I FROM TRICHOPHYTON GRANULOSUM, TRICHOPHYTON INTERDIGITALE, MICROSPORUM QUINCKEANUM, TRICHOPHYTON RUBRUM, AND TRICHOPHYTON SCHÖNLEINII

1965 ◽  
Vol 43 (1) ◽  
pp. 30-39 ◽  
Author(s):  
C. T. Bishop ◽  
M. B. Perry ◽  
F. Blank ◽  
F. P. Cooper
Keyword(s):  
Aqueous Solutions ◽  
Copper Complexes ◽  
Trichophyton Rubrum ◽  
Periodate Oxidation ◽  
Structural Features ◽  
Water Soluble ◽  
Major Constituent ◽  
Branch Points ◽  
Terminal Units ◽  
Hydrolysis Of

A group of polysaccharides, called galactomannans I, were precipitated as their insoluble copper complexes from aqueous solutions of the crude polysaccharides obtained from each of the organisms designated in the title. The five galactomannans I were homogeneous under conditions of electrophoresis and ultracentrifugation and had high positive specific rotations. The major constituent monosaccharide was D-mannose; amounts of D-galactose ranged from nil for the polysaccharide from T. rubrum to 13% for that from T. schönleinii. Methylation and hydrolysis of the five galactomannans I yielded varying amounts of the following: 2,3,5,6-tetra-O-methyl-D-galactose (not present in the products from T. rubrum), 2,3,4,6-tetra-O-methyl-D-mannose, 2,3,4-tri-O-methyl-D-mannose, 2,4,6-tri-O-methyl-D-mannose, 3,4-di-O-methyl-D-mannose, and 3,5-di-O-methyl-D-mannose. Periodate oxidation results agreed with the methylation studies. The gross structural features of each galactomannan I appear to be the same, namely, a basic chain of 1 → 6 linked α-D-mannopyranose units for approximately every 22 of which there is a 1 → 3 linked α-D-mannopyranose residue. Branch points occur along the 1 → 6 linked chain at the C2 positions of the D-mannopyranose units and once in every 45 units at the C2 position of a 1 → 6 linked D-mannofuranose residue. The D-galactose in the polysaccharides is present exclusively as non-reducing terminal furanose units; non-reducing terminal units of D-mannopyranose are also present. The variations in the identities and relative amounts of the non-reducing terminal units were the only apparent differences in the gross structural features within this group of polysaccharides.

ChemInform Abstract: Inhibition of Nitrosamine Formation by Inorganic and Organic Salts.

ChemInform ◽  
1987 ◽  
Vol 18 (4) ◽  
Author(s):  
M. IITSUKA ◽  
T. KATO ◽  
K. KIKUGAWA
Keyword(s):  
Organic Salts ◽  
Inorganic And Organic

scholarly journals Photo-transformation of aqueous nitroguanidine and 3-nitro-1,2,4-triazol-5-one : emerging munitions compounds

2021 ◽  
Author(s):  
Julie Becher ◽  
Samuel Beal ◽  
Susan Taylor ◽  
Katerina Dontsova ◽  
Dean Wilcox
Keyword(s):  
Aqueous Solutions ◽  
Degradation Products ◽  
Pure Water ◽  
Transformation Products ◽  
Water Soluble ◽  
Uv Exposure ◽  
Degradation Pathways ◽  
Solution Ph ◽  
Photo Degradation ◽  
Degradation Rates

Two major components of insensitive munition formulations, nitroguanidine (NQ) and 3-nitro-1,2,4-triazol-5-one (NTO), are highly water soluble and therefore likely to photo-transform while in solution in the environment. The ecotoxicities of NQ and NTO solutions are known to increase with UV exposure, but a detailed accounting of aqueous degradation rates, products, and pathways under different exposure wavelengths is currently lacking. We irradiated aqueous solutions of NQ and NTO over a 32-h period at three ultraviolet wavelengths and analyzed their degradation rates and transformation products. NQ was completely degraded by 30 min at 254 nm and by 4 h at 300 nm, but it was only 10% degraded after 32 h at 350 nm. Mass recoveries of NQ and its transformation products were >80% for all three wavelengths. NTO degradation was greatest at 300 nm with 3% remaining after 32 h, followed by 254 nm (7% remaining) and 350 nm (20% remaining). Mass recoveries of NTO and its transformation products were high for the first 8 h but decreased to 22–48% by 32 h. Environmental half-lives of NQ and NTO in pure water were estimated as 4 and 6 days, respectively. We propose photo-degradation pathways for NQ and NTO supported by observed and quantified degradation products and changes in solution pH.

Water-soluble Sulfonated Phosphorus(v) Corrolazines and Porphyrazines: Effect of Macrocycle Contraction and Pyrazine Ring Fusion on Spectral, Acid-base and Photophysical Properties

2021 ◽  
Author(s):  
Svetlana S. Ivanova ◽  
Denis S Salnikov ◽  
Gleb Knorr ◽  
Olesja Ledovich ◽  
Valery Sliznev ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Photophysical Properties ◽  
Water Soluble ◽  
Acid Base ◽  
Ring Fusion ◽  
Pyrazine Ring

Novel water-soluble dihydroxophosphorus(V) complexes of sulphophenyl substituted porphyrazine (6), corrolazine (7) and its pyrazine fused derivative (8) have been prepared and their spectral, acid-base and photophysical properties in aqueous solutions...

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