Journal
MACROMOLECULES
Volume 43, Issue 17, Pages 7321-7329Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma101349t
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Funding
- Australian Research Council [DP0986043]
- Knut and Alice Wallenberg Foundation (Sweden)
- Australian Research Council [DP0986043] Funding Source: Australian Research Council
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The first two-dimensional structural distributions are reported for a hyperbranched polymer, the two dimensions being macromolecular size and individual branch length. The 2D distributions for native starch, a polymer with both short- and long-chain branched components (amylopectin and amylose), were obtained by size fractionation using size-exclusion chromatography combined with enzymatic debranching. These distributions show distinct macromolecular architectures: separate mountains corresponding to amylopectin and amylose and two foothills assigned to hybrid populations. The distributions reveal new mechanistic information on the underlying polymer synthesis. The branch-length distributions for amylopectin are independent of macromolecular size, whereas a size variation is observed for amylose. Biological imperatives in amylopectin biosynthesis force the same branching structure for all macromolecular sizes because of evolutionary pressure to provide the crystallinity indispensable for the plant survival. Amylose biosynthesis does not have such restrictive biological constraints, offering a range of branched structures throughout macromolecular sizes and revealing a previously unsuspected size dependence.
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