Formation of fibrous materials from dense caseinate dispersions

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Abstract

Application of shear and cross-linking enzyme transglutaminase (Tgase) induced fibrous hierarchical structures in dense (30% w/w) calcium caseinate (Ca-caseinate) dispersions. Using Tgase was essential for the anisotropic structure formation. The fibrous materials showed anisotropy on both micro- and macroscale as determined with scanning electron microscopy (SEM) and mechanical analyses, respectively. SEM revealed protein fibers with a diameter of approximately 100-200 nm; visually, we observed fibers of about 1 mm. Both shear and Tgase affected the reinforcement of the fibers to a large extent, whereas the mechanical properties in the direction perpendicular to the shear flow remained constant. Shearing Ca-caseinate without Tgase yielded a slightly anisotropic layered structure. Both cross-linking in the absence of shear and cross-linking during mixing resulted in gels without alignment. The formation of shear- and enzyme-induced anisotropic structures was explained by aligning of protein aggregates due to shear and concurrent solidification of the aligned protein aggregates.
Original languageEnglish
Pages (from-to)1271-1279
JournalBiomacromolecules
Volume8
Issue number4
DOIs
Publication statusPublished - 2007

Keywords

  • non-spinneret formation
  • wet spinning technique
  • microbial transglutaminase
  • functional-properties
  • sodium caseinate
  • protein assemblies
  • extrusion-cooking
  • light-scattering
  • shear-flow
  • water

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