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dc.contributor.authorStoddart, James Fraseren
dc.date.accessioned2018-01-31T11:38:21Z
dc.date.available2018-01-31T11:38:21Z
dc.date.issued1966en
dc.identifier.urihttp://hdl.handle.net/1842/27480
dc.description.abstracten
dc.description.abstractThe results of a re-investigation of A.Senegal gum have led. to the rejection of the idea that its molecular structure is necessarily based on a "main chain" or "backbone" of (31,3- linked g-galactose residues. The concept that the A.Senegal gum molecule contains a "main chain" or "backbone," to which are attached short side chains, implies that there is one chain in the macromolecule which is unique in being very much longer than the others. Unequivocal evidence for the occurrence of such chains in A.Senegal gum molecules does not exist. In the case of A.arabica gum, all the evidence from structural investigations, and from the solution behaviour of the gum favours a dichotomously branched galactan framework for the basal units of the macromolecules. These findings suggest that it is no longer meaningful to interpret the structural features of these gums in terms of average repeating units. The results, however, may have a wider implication and significance. On re-examination, many plant gums (Smith & Montgomery, 1959) of' the substituted arabinogalactan type, and perhaps some of the arabinogalactans themselves (Timell, 1965), may be shown to exhibit dichotomous branching within their galactan frameworks.en
dc.description.abstractAlthough structural work has been carried out on gums from other Acacia species, including A.mollissima (Stephen, 1951; CHAPTER V - 125 - Young, 1963), A.pycnantha (Hirst & Perlin, 1954; Aspinall, Hirst & Nicolson, 1959), A.karroo (Charlson, Nunn & Stephen, 1955a), A.cyanophylla (Gharlson, Nunn & Stephen, 1955b), A.catechu (Hulyalkar, Ingle & Bhide, 1956, 1959), A.sundra (Mukherjee & Shrivastava, 1957, 1958, 1959; Shrivastava, 1962), A.seyal (Herbich, 1963), A.nilotica (Karamalla, 1965; Anderson & Karamalla, 1966b), A.nubica (Oree, 1966) and A.laeta (Smith, 1966), the investigations reported in this thesis represent the first exploratory steps towards interpreting molecular structures of Acacia gums at the molecular level.en
dc.publisherThe University of Edinburghen
dc.relation.isreferencedbyAlready catalogueden
dc.subjectAnnexe Thesis Digitisation Project 2017 Block 16en
dc.titleStudies on plant gums of the acacia groupen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelen
dc.type.qualificationnamePhD Doctor of Philosophyen


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