Die Quantitative Organische Mikroanalyse

Pregl, Fritz

doi:10.1007/978-3-662-42495-7

Cited by 54 publications

(6 citation statements)

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“…This can be explained by the fact that the amount of fulvic acid, containing little methoxyl group, increased rapidly with depth. B 1 -horizon contained more methoxyl group than A 2 -horizon; this fact coincided with the previous experiment&> that B 1 -horizon contained more humic acid than A 2 -horizon.…”

Section: Resultssupporting

confidence: 89%

“…a) Methoxyl crmtent of upland top scrils (Table 2) The largest amounts were found in A 0 -horizons, but they were considerably low compared with that of the rotted timber (5.11516') or that of the peats (2.3051~, 3.34~~). The content was generally larger than 1~6' in non-volcanic ash soils, and smaller than 151;:; in volcanic ash soils-the small- 15.520 (1) percentage of humic acid to total humus increased, (2) proportion of fulvie acid to humic acid in alkali ex..: tract decreased and then (3) percentage of A-tYPe humic acid to total humic acid increased, While the color-quotient and color-index of both A.-type humic acid and Btype humic acid remained almost constant.…”

Section: Resultsmentioning

confidence: 86%

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Methoxyl content of humus

Kosaka¹,

Honda²

1956

Soil Science and Plant Nutrition

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 86%

Methoxyl content of humus

Kosaka¹,

Honda²

1956

Soil Science and Plant Nutrition

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“…Chloride in the urine was estimated by a modification of the Volhard method (12). Total plasma protein and albumin were determined by a micro-Kjeldahl method (13) (16). These data are summarized in Table I.…”

Section: Methodsmentioning

confidence: 99%

Renal Excretion of Sulfamerazine 1

Earle¹

1944

J. Clin. Invest.

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Certain advantages might accrue to the use of sulfonamides such as sulfamerazine (2-sulfonamido 4-methyl pyrimidine) that, having essentially the same antibacterial activity as others in common use, are characterized by low rates of renal excretion ( 1 to 6). These advantages include lower and less frequent dosage and, perhaps, some reduction of the renal hazard incidental to the precipitation of material in the kidneys and urinary tract. It was because of these considerations that it was deemed advisable to study some of the factors concerned with the excretion of sulfamerazine. Observations were also made on the excretion of the N'-acetyl derivative of sulfamerazine and of sulfadiazine (2-sulfanilamido pyrimidine) for comparative purposes.The study was conducted in a manner that yields quantitative information on the various discrete processes involved. This was accomplished by the simultaneous measurement of the renal plasma clearance of the drug and the rate of glomerular filtration under different experimental conditions.Measurements were also made on the extent to which sulfamerazine is bound to the non-diffusable constituents of plasma, presumably plasma albumin, since it is only the unbound drug in the plasma water that is presented to the glomeruli for filtration. The ratio of the unbound drug clearance to the concurrent rate of glomerular filtration (excretion ratio) yields information on the extent to which the filtered material is reabsorbed or excreted by the renal tubules. The dog experiments were performed on 3 well-trained female mongrels. The glomerular filtration rate was measured by the creatinine clearance (8). The sulfamerazine clearance and glomerular filtration rate were determined simultaneously for several collection periods. Various procedures designed to alter the excretion of the drug were then introduced and the observations continued.Blood was obtained during each experiment for the estimation of total plasma protein and albumin content so that the concentration of unbound sulfonamide in the plasma water could be determined and its clearance calculated. The proportion of total plasma sulfonamide bound on the non-diffusible constituents of plasma was determined by dialysis across a cellophane membrane against an isotonic phosphate buffer at pH 7.4 and 370 C.Eighteen hours were allowed for the establishment of an equilibrium. All values for plasma binding were corrected to a standard plasma albumin content of 4.0 grams per 100 ml. This correction assumes that the plasma albumins of different individuals have no qualitative differences in their abilities to bind sulfonamides. Each experiment was performed in duplicate, at 4 different concentrations of plasma sulfonamide.Chemical methods. The concentration of mannitol in the plasma and urine was determined by a modification (9) of (7); creatinine by a modified Folin procedure on tungstic acid filtrates (10); and sulfonamides by the method of (11). Twenty per cent p-toluene sulfonic acid was used as the precipitating and hydrolyzing agen...

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“…A 5-12 milligram sample of organic compound is heated with 1 ml of concentrated sulfuric acid and 4 ml of 5 N chromic acid in a sealed tube ( ' 9 47 5, 6 $ 7 3 Next, the reaction mixture is cooled and treated with hydrazine hydrate to remove the excess of chromic acid and partially neutralized with sodium hydroxide solution. Then after the addition of phosphoric acid the acetic acid is obtained by steam distillation of the reaction mixture.…”

mentioning

confidence: 99%

Determination of carbon‐14 and/or tritium in the methyl group of organic compounds. Isotopic C‐methyl analysis

Kornhauser

Nystrom

1965

J. Labelled Cpd. Radiopharm.

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The determination of the millimolar radioactivity of C‐methyl groups in selected carbon‐14 and tritium labelled compounds by modification of the Kuhn‐Roth method is presented. Oxidation of the radioactive sample in an open vessel using a solution of sodium dichromate and sulfuric acid allows radioassay of the C‐methyl group as acetic acid. This procedure has been tested with a representative group of labelled compounds and found to be isotopically reliable.

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Die Quantitative Organische Mikroanalyse

Abstract: Alle Rechte, insbesondere das der Übersetzung in fremde Sprachen, vorbehalten.

Cited by 54 publications

References 0 publications

Methoxyl content of humus

Methoxyl content of humus

Renal Excretion of Sulfamerazine 1

Determination of carbon‐14 and/or tritium in the methyl group of organic compounds. Isotopic C‐methyl analysis

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