منابع مشابه
A Convenient Method for the Formol Titration
The formol titration, as described by Srrensen, 1 has been most useful in the determination of amino-acids and especially in following the course of hydrolysis of proteins. The method as originally described could not be used for accurate determinations of small quantifies of amino-acids owing to the difficulty of determining the exact end-point. The value obtained also depends on the point at ...
متن کاملEquilibria for the reaction of amines with formaldehyde and protons in aqueous solution. A re-examination of the formol titration.
The existence of protonated hydroxymethylamines of sec+ ondary amines, RzNHCHtOH, in equilibrium with hydroxymethylamines and protonated amines, has been demonstrated by titration at equilibrium and by rapid titration of the protonated hydroxymethylamines. Analogous compounds, . R3NCHeOH, are formed from formaldehyde and the sterically favorable tertiary amines: pyridine, iv-methylimidazole, an...
متن کاملThe Acidity of Formaldehyde and the End- Point in the Formol Titration
Two factors are involved in a systematization of the form01 titration. The first of these factors is the titration constant of the amino acid in formaldehyde solution. This aspect has been discussed in a previous paper (4) for certain of the monoamino acids. The basic amino acids will be treated later. The second factor is the behavior of the solvent on the addition of strong alkali, just as th...
متن کاملThermodynamic Study of the Ion-Pair Complexation Equilibria of Dye and Surfactant by Spectral Titration and Chemometric Analysis
Surfactant-dye interactions are very important in chemical and dyeing processes. The dyes interact strongly with surfactant and show new spectrophotometric properties, so the UV-vis absorption spectrophotometric method has been used to study this process and extract some thermodynamic parameters. In this work, the association equilibrium between ionic dyes and ionic surfactant were studied by a...
متن کاملProtolytic equilibria of doxorubicin as determined by isoelectric focusing and 'electrophoretic titration curves'.
Doxorubicin (AdriamycinR) and the related compound daunorubicin (Daunomycin) are antibiotics of the anthracycline group [l] with cytotoxic and antimitotic activity [2]. Their clinical uses in the treatment of acute leukemia and solid tumors have been reviewed [3-51. Their biological activity is linked to the formation of an intercalative complex with DNA [6-S] with concomitant i~libition of bot...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1933
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)76025-0