Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Rudolf Kohn"'
Autor:
Rudolf Kohn
Publikováno v:
Food and Nutrition Bulletin. 14:1-1
Autor:
Anna Malovíková, Rudolf Kohn
Publikováno v:
Collection of Czechoslovak Chemical Communications. 46:1701-1707
The values of activity coefficients γCa2+, determined earlier in solutions of calcium oligoguluronates and oligogalacturonates of various polymerization degree n, were interpreted. Values γCa2+ corresponding to an intramolecular Ca2+ bond to a poly
Publikováno v:
Collection of Czechoslovak Chemical Communications. 46:1405-1412
Homogeneous, water soluble 4-O-methyl-D-glucurono-D-xylan was isolated from the bark of white willow (Salix alba L.). The equivalent weight of the polymer was found to be 990, i.e. each sixth unit of D-xylose on average was substituted by 4-O-methyl-
Autor:
Rudolf Kohn, Karol Tihlárik
Publikováno v:
Collection of Czechoslovak Chemical Communications. 51:1160-1169
The binding of Pb2+ and Cu2+ ions to starch and amylose 2,3-dicarboxy derivatives of degrees of oxidation DO = 0.09-0.74 was investigated. The interaction of the metal cations with the carboxy groups of the derivatives was evaluated in terms of the c
Autor:
Anna Malovíková, Rudolf Kohn
Publikováno v:
Collection of Czechoslovak Chemical Communications. 47:702-708
Using two experimental techniques (dialysis and polarography) the binding of cadmium ions to the pectin carboxylic groups was studied as a function of their degree of esterification E in the range of E 0 to 84.2%. Stability constants for the binding
Autor:
Rudolf Kohn, Karol Tihlárik
Publikováno v:
Collection of Czechoslovak Chemical Communications. 49:2116-2129
A series of 2,3-dicarboxy derivatives of oxidation degree DO(d.c.) 0.13 to 0.90 was prepared by a two-stage oxidation of corn starch and amylose. The activity coefficient γCa2+ of calcium counterions was estimated in solutions of calcium salts of th
Publikováno v:
Collection of Czechoslovak Chemical Communications. 46:266-269
Pectin was deesterified by pectinesterase of tomato either by the isolated enzyme or by the crude preparation, using a pH-stat and a continuous titration at pH 7.5 up to the esterification degree DE 2%. A simple procedure for preparation of high-mole
Publikováno v:
Collection of Czechoslovak Chemical Communications. 48:1922-1935
The binding of Cu2+ and Cd2+ ions to potassium oligogalacturonates of polymerization degree DP 1 to 9 was investigated by ion-specific electrodes and by the metallochromic indicator method. The interaction was evaluated on the basis of degree of asso
Publikováno v:
Collection of Czechoslovak Chemical Communications. 51:1772-1780
The helix-forming interaction of poly(Lys-Ala-Ala) with potassium pectinates of various esterification degree (E 0-87%) was quantitatively investigated by circular dichroism spectra. The helix-forming effect of pectinates is significant even at a low
Autor:
Rudolf Kohn, Anna Malovíková
Publikováno v:
Collection of Czechoslovak Chemical Communications. 48:3154-3165
The activity of Zn2+ ions bound to carboxyl groups of pectin of esterification degree E 0 to 90% and to oligomeric potassium galacturonates of polymerization degree 1 to 7 was estimated by the metallochromic indicator (tetramethylmurexide) method. Th