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The structure of pectin

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Summary

Pectin from pumpkin, guava, country pears and pomelo has been purified by repeated fractional precipitation with decreasing strengths of alcohol according to the method of Schneider and Bock. The analytical values for uronic acid and methoxyl content show that neither arabinose nor galactose are integral constituents of pectin. The values also indicate the probability that the preparations contain an identical pectin molecule.

The identity of the basic structural unit has been confirmed by analysis of the pectic acid derived from the pectins from the 4 sources mentioned above, as well as by determination of the equivalent weights of the pectic acid by analysis of the calcium salt.

The equivalent weights found indicate that the chain length of the pectic acid molecule is of the order of 50 to 100 galacturonic acid units.

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Author notes

  1. P. N. Rangachari

    Present address: National Chemical Laboratory, Poona

Authors and Affiliations

  1. The University Biochemical Laboratory, Madras

    P. N. Rangachari

Authors
  1. P. N. Rangachari
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Additional information

Communicated by Prof. M. Damodaran,f.a.sc.

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Rangachari, P.N. The structure of pectin. Proc. Indian Acad. Sci. (Math. Sci.) 33, 100 (1951). https://doi.org/10.1007/BF03172191

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  • DOI: https://doi.org/10.1007/BF03172191

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