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Dehydration Artefacts in Gelatinized Starches
Author(s) -
Bowler P.,
Evers A. D.,
Sargent J.
Publication year - 1987
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19870390205
Subject(s) - granule (geology) , starch , dehydration , scanning electron microscope , chemical engineering , freeze drying , chemistry , materials science , polymer science , composite material , chromatography , food science , biochemistry , engineering
Scanning electron microscopy of swollen starch granule systems is valuable for interpretation of structural changes, but the results obtained must be interpreted with caution. The two major drying systems used, solvent exchange and lyophilization, both produce artefacts but of different types. The presence of pores on specimens prepared by lyophilization has often been interpreted as a true feature of the granule structure, but our experience suggests that this is incorrect. Furthermore, we consider that the fibrillar structure present in preparations of lyophilized starch solubles results from ice crystal formation effectively concentrating, in the remainder of the solution, solute which is subsequently preserved as a dry web.