Food or edible material: processes – compositions – and products – Direct application of electrical or wave energy to food...
Patent
1998-08-13
2000-07-25
Bhat, Nina
Food or edible material: processes, compositions, and products
Direct application of electrical or wave energy to food...
426521, 422 21, 422 22, 42218604, 99451, A23C 300
Patent
active
060934328
ABSTRACT:
A method and apparatus for electrically treating foodstuffs flowing through a treatment chamber with low energy, high voltage electrical pulses for non-thermal pasteurization and/or sterilization. Instant-charge-reversal electrical pulses are applied to a foodstuff located between two electrodes in a treatment chamber, each electrical pulse having a pulse width in a range from about 1 to 5 .mu.s with vertically rising voltage to a peak followed immediately with a decreasing voltage through zero volts and continuing to a voltage peak of opposite polarity and rising vertically back to zero volts. The electrical pulses are very low energy (0.1-25 Joules/pulse) and the field strengths are in the range 15 kVolts/cm to 120 kVolts/cm. This instant-charge-reversal electrical pulse is shown to have a much greater microbial killing power compared to other pulse waveforms used to treat foodstuff. The apparatus uses an electrode arrangement including a cylindrical inner electrode and an annular disc with the cylindrical electrode inserted through the hole in the disc.
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Cross James D.
Griffiths Mansel W.
Ho Shirley Yuet Wa
Mittal Gauri Shankar
Bhat Nina
Hill Nancy E.
Schumacher Lynn C.
University of Guelph
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