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  • Stufenweise Elutionsanalyse von Carboxymethylstärke
    Čeh, Mirko, 1923-2013 ; Stropnik, Črtomir
    Paperchromatographic elution separation with perchloric acid solutions of different molarities were carried out with synthesized carboxymethylated starches (CMS) of the following degrees of ... substitution (DS): 0,30, 0,58, 1.09 and 2,17. On the basis of occuring coloured sections in comparision with those of native starch is subjected during the CMS-synthesis to a partial degradation. A comparision of the chromatograms of the starch ethers indicatesfor higher DS a change into violet colours, a fading of these colour intensities and an arising of new coloured sections which were separated by lower concentrations of perchloric acid. Already at a degree of substitution of 2,17 any coloured sections are lacking. Induced carboxymethyl-groups in the course of the synthesis prevent the formation of the iodine complex of amylose and the amylopectin-iodine reaction. At defined of the CMS-synthesis the paperchromatographic elution separation makes it possible to evaluate the approximate degree of substitution of starch on the basis of the occuring coloured sections and colour shades.
    Vir: Die Stärke = Starch. - ISSN 0038-9056 (Jhrg. 27, Hf. 3, 1975, str. 72-76)
    Vrsta gradiva - članek, sestavni del
    Leto - 1975
    Jezik - nemški
    COBISS.SI-ID - 5079830

vir: Die Stärke = Starch. - ISSN 0038-9056 (Jhrg. 27, Hf. 3, 1975, str. 72-76)
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