Extraction using moderate electric fields

During moderate electric field (MEF) processing, a voltage applied across a food material may affect the permeability of cell membranes. It is known that high electric fields can cause either reversible or irreversible rupture of cell membranes. In this research, the effect of MEF processing on perm...

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Bibliographic Details
Published in:Journal of food science 2004, Vol.69 (1), p.FEP7-FEP13
Main Authors: Sensoy, I, Sastry, S.K
Format: Article
Language:English
Subjects:
Biological and medical sciences
black tea
cells
electric field
Electric fields
electrical treatment
extraction
Extraction processes
Food engineering
Food industries
food processing
Food science
Fundamental and applied biological sciences. Psychology
General aspects
Leaves
MEF
Membranes
Mentha
mint
moderate electric field
moderate electric field processing
Permeability
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Summary:During moderate electric field (MEF) processing, a voltage applied across a food material may affect the permeability of cell membranes. It is known that high electric fields can cause either reversible or irreversible rupture of cell membranes. In this research, the effect of MEF processing on permeability was studied. Effects of frequency and electric field strength were investigated. Cellular structure was investigated by transmission electron microscopy (TEM). Fermented black tea leaves and fresh or dry mint leaves were placed in tea bags or cut in 1 cm2 squares, depending on the experiment, and immersed in an aqueous fluid medium. Control samples were heated on a hot plate. MEF treatments were conducted by applying a voltage across electrodes immersed in opposite sides of the beaker. Control and MEF‐treated fresh mint leaf samples heated to 50°C were analyzed by TEM. MEF processing significantly increased the extraction yield for fresh mint leaves because of additional electric field effects during heating. Dried mint leaves and fermented black tea leaves were not affected by the treatment type. Low frequency resulted in higher extraction rates for fresh mint leaves. The electric field strength study showed that electrical breakdown is achieved even at low electric field strengths. MEF treatment shows potential to be used as an alternative to conventional heating for extraction from cellular materials.
ISSN:0022-1147
1750-3841
DOI:10.1111/j.1365-2621.2004.tb17861.x