Summary
Investigations on fibres and folies of pectin show its negative double refraction (Eigendoppelbrechung). According to the X-ray diagrams the demethoxylated specimens «crystallize» in a higher degree than the original pectin. Calculations seem to support the hypothesis of folded chains.
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References
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Wuhrmann, K., Pilnik, W. Über Optik und Feinbau des Pektins und seiner Derivate. Experientia 1, 330–332 (1945). https://doi.org/10.1007/BF02163810
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DOI: https://doi.org/10.1007/BF02163810