An experimental system based on the o-core transformer structure was established and
used to extract pectin from orange peel waste. Unlike other electric-field-assisted techniques,
it avoids the use of powered electrodes. The acidic solvent acts as the secondary
coil connected to a purpose-made glass chamber which forms a closed loop. Then the
induced electric field in the system appears to be under the influence of alternating
magnetic flux based on Faraday's law of induction. We found that an increase in the excitation
voltage causes enhancement of the pectin yield. Increasing frequency from 20 to
200 kHz had a negative impact on pectin yield partially due to the increased impedance of
the primary coil. The ionic conduction was enhanced at the same excitation voltage since
there are more free ions in the mixture at lower pH. This means that a lower impedance in
the mixture is conducive to extraction. This multidisciplinary technique combines the
transformer concept with the electric-field-assisted process, thus providing a reference for
the application into agricultural by-products treatment.