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Pulsed electric field treatment for solid-liquid extraction of red beetroot pigment: mathematical modelling of mass transfer

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Author

Summary, in English

The extraction of red pigment and conductive matters from individual red beet tissue slices following pulsed electric field pretreatment of different durations was compared with a two dimensional bimodal Fickian diffusion model. The process appeared to be governed by two apparent diffusion coefficients, one slow and one fast. The values of these coefficients were independent of the duration of treatment, but the yield associated with each coefficient varied. Following the treatment of longest duration and treatment by freezing and thawing of the tissue, the yield from the faster diffusion coefficient accounted completely for the mass transport. The faster apparent diffusion coefficient was 2-5 times smaller than the diffusion coefficients in dilute solution. (C) 2003 Elsevier Ltd. All rights reserved.

Department/s

  • Department of Food Technology, Engineering and Nutrition

Publishing year

2004

Language

English

Pages

229-236

Publication/Series

Journal of Food Engineering

Volume

64

Issue

2

Document type

Journal article

Publisher

Elsevier

Topic

  • Food Engineering

Keywords

  • Fickian diffusion
  • Bimodal
  • Red beet
  • Diffusion coefficient
  • Pulsed electric field

Status

Published

ISBN/ISSN/Other

  • ISSN: 0260-8774