Rheology and gelation of water-insoluble dextran from Leuconostoc mesenteroides NRRL B-523

Prabhu Arcot Padmanabhan, Dong Shik Kim, Daewon Pak, Sang Jun Sim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Dynamic oscillatory testing has been used to study the rheology of water-insoluble dextran. The rheological properties (storage and loss moduli) of dextran gel were measured and dextran was found to be neither a strong gel nor a weak gel, but an entanglement network at a concentration of 250 mg/ml. The extent of gelation, illustrated by the gel elastic modulus G′, is found to decrease with increasing concentration of calcium ions. This was confirmed by shift of crossover frequencies towards higher values on the dynamic spectra and lower yield stress τ values obtained from stress ramp experiments. Finally, a comparison between gelation of dextran and alginate (a similar biopolymer) was made for clear understanding of effect of calcium ions on the dextran gelation.

Original languageEnglish
Pages (from-to)459-468
Number of pages10
JournalCarbohydrate Polymers
Volume53
Issue number4
DOIs
Publication statusPublished - 2003 Sep 1
Externally publishedYes

Fingerprint

Leuconostoc mesenteroides
Dextran
Rheology
rheology
dextran
Gelation
gelation
Dextrans
Gels
Water
gels
water
Calcium
dynamic testing
Ions
ions
calcium
loss modulus
Architectural Accessibility
Biopolymers

Keywords

  • Gelation
  • Insoluble dextran
  • Leuconostoc mesenteroides
  • Loss modulus
  • Rheology
  • Storage modulus

ASJC Scopus subject areas

  • Food Science
  • Biochemistry

Cite this

Rheology and gelation of water-insoluble dextran from Leuconostoc mesenteroides NRRL B-523. / Padmanabhan, Prabhu Arcot; Kim, Dong Shik; Pak, Daewon; Sim, Sang Jun.

In: Carbohydrate Polymers, Vol. 53, No. 4, 01.09.2003, p. 459-468.

Research output: Contribution to journalArticle

Padmanabhan, Prabhu Arcot ; Kim, Dong Shik ; Pak, Daewon ; Sim, Sang Jun. / Rheology and gelation of water-insoluble dextran from Leuconostoc mesenteroides NRRL B-523. In: Carbohydrate Polymers. 2003 ; Vol. 53, No. 4. pp. 459-468.
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