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Effects of Processing on the Structure of Zein/Oleic Acid Films Investigated by X-Ray Diffraction

✍ Scribed by Ying Wang; Francisco Lopes Filho; Phillip Geil; Graciela W. Padua

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
300 KB
Volume
5
Category
Article
ISSN
1616-5187

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✦ Synopsis

Abstract

Summary: Zein films plasticized with oleic acid were formed by solution casting, by the stretching of moldable resins, and by blown film extrusion. The effects of the forming process on film structure were investigated by X‐ray diffraction. Wide‐angle X‐ray scattering (WAXS) patterns showed d‐spacings at 4.5 and 10 Å, which were attributed to the zein α‐helix backbone and inter‐helix packing, respectively. The 4.5 Å d‐spacing remained stable under processing while the 10 Å d‐spacing varied with processing treatment. Small‐angle X‐ray scattering (SAXS) detected a long‐range periodicity for the formed films but not for unprocessed zein, which suggests that the forming process‐promoted film structure development is possibly aided by oleic acid. The SAXS d‐spacing varied among the samples (130–238 Å) according to zein origin and film‐forming method. X‐ray scattering data suggest that the zein molecular structure resists processing but the zein supramolecular arrangements in the formed films are dependent on processing methods.

Structural model for a zein molecular aggregate (based on Matsushima et al.10). Rectangular prisms of individual zein molecules are hexagonally aligned parallel to each other.

magnified imageStructural model for a zein molecular aggregate (based on Matsushima et al.10). Rectangular prisms of individual zein molecules are hexagonally aligned parallel to each other.

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