Physicochemical Studies on Starches. Part 63. The Molecular Size and Shape of Amylopectin
W. Banks, Robert Geddes, C Greenwood, I. Gwyn Jones
Starch - Stärke
Abstract
Abstract Light‐scattering, viscosity and ultracentrifugal techniques have been applied to a number of amylopectin samples. These measurements have confirmed the very large size of the macromolecule, and shown that such values are real, and are not due to aggregation resulting from hydrogen‐bonding. The hydrodynamic behaviour of amylopectin has been compared with that of the closely‐related glycogen. The difference between the two has been shown to be due to the much more flexible, coil‐like nature of the amylopectin. An examination has been made of the factors governing the extension of amylopectin as the pH is varied, and it is shown that under appropriate solvent conditions a “coil‐to‐helix” transformation may be observed. The conformation of the amylopectin molecule is discussed, and the concept that the macromolecule is a two‐dimensional entity is proposed.
Extracted Claims
3 claims extracted from this paper into the knowledge graph
amylopectin undergoes coil-to-helix transformation
“under appropriate solvent conditions a 'coil-to-helix' transformation may be observed.”
amylopectin has very large size
“These measurements have confirmed the very large size of the macromolecule.”
amylopectin is more flexible, coil-like
“The difference between the two has been shown to be due to the much more flexible, coil-like nature of the amylopectin.”