ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7

Published monthly
 

Determination of the carboxyl groups of pectin by the precipitation of insoluble copper pectates and pectinates

R. Kohn and V. Tibensk√Ĺ

Slovak Academy of Sciences, Bratislava

 

Abstract: The conditions for the detn. of free and total COOH groups of pectin by pptn. of insol. Cu pectates and pectinates (Tibensky, et al., CA 59, 11795b) were described. Pectins of various origin with the degree of esterification in the range 0-80% were tested. For the detn. of free carboxyl, pH must be adjusted to 7.0 by addn. of NaOH. For the detn. of total carboxyl after hydrolysis of esters, the pH must be adjusted to 5.3-5.5 by addn. of AcOH. HCO3--must be absent. When the concn. of free carboxy is 2 × 10-2 -2 × 10-3 equiv./1., the deviation is ±1.3%; When concn. of total carboxyl is 1 × 10-2 equiv./l., the deviation is±1.0% (both relative to the acidimetric method).

Full paper in Portable Document Format: 192a98.pdf (in Slovak)

 

Chemical Papers 19 (2) 98–106 (1965)

Sunday, November 28, 2021

IMPACT FACTOR 2020
2.097
SCImago Journal Rank 2020
0.344
SEARCH
Advanced
VOLUMES
XXVIII. International Conference on Coordination and Bioinorganic Chemistry
© 2021 Chemical Papers