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The size dependence of the average number of branches in amylose
South China Agr Univ, Coll Food Sci, 483 Wushan Rd, Guangzhou 510642, Guangdong, Peoples R China..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience.ORCID iD: 0000-0003-3572-7798
Univ Queensland, Ctr Crop Sci, Queensland Alliance Agr & Food Innovat, Brisbane, Qld 4072, Australia..
Univ Queensland, Ctr Nutr & Food Sci, Queensland Alliance Agr & Food Innovat, Brisbane, Qld 4072, Australia..
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2019 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 223, article id UNSP 115134Article in journal (Refereed) Published
Abstract [en]

Amylose has a small but significant number of long-chain branches. Two-dimensional size-exclusion chromatography is used to obtain the first measurement of the average number of branches per amylose molecule (from potato tubers) as a function of molecular size. Molecular weight dispersity, average chain length and average amylose molecular weight all increase with increasing size. However, the average number of branches of amylose molecules is weakly, if at all, dependent on size, with 2-4 per molecule except perhaps for the very largest molecules, although for these, the data may suffer from artifacts. Differences in the sizes of amylose molecules is mostly ascribed to variations in chain length. This observation is consistent with the postulate that most branching events occur in the early stage of amylose synthesis, and afterwards the branches are further elongated by granule-bound starch synthases. This gives improved mechanistic understanding of amylose biosynthesis.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 223, article id UNSP 115134
Keywords [en]
Starch, Amylose, Molecular structure, 2-dimensional, Branching
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-257791DOI: 10.1016/j.carbpol.2019.115134ISI: 000481570700082PubMedID: 31426958Scopus ID: 2-s2.0-85070064080OAI: oai:DiVA.org:kth-257791DiVA, id: diva2:1351041
Note

QC 20190913

Available from: 2019-09-13 Created: 2019-09-13 Last updated: 2019-10-16Bibliographically approved

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Vilaplana, Francisco

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