The characteristics of the alum were revealed after a detailed
analysis. This study is based on the polarization properties of
the ingredients involved. The frequency regions of the media
associated with orientation and atomic polarization were
selected and used to observe deionized water and aqueous
alum solutions with different concentrations. Both the
dielectric dispersion curve ε
0 and the dielectric absorption
curve ε
00 were investigated. A new method involving subtracting
the dielectric dispersion and loss due to water from
that of the food solution was proposed based on other studies
involving food with high water content. The method was
confirmed to be effective at detecting the nonaqueous ingredients.
The new technology, based on the differential
dielectric spectrum of the DFDSs, is simple in operation and
effective in determining the added alum dose. Moreover, the
instruments involved are cheap and readily available. The
technology is based on the dispersion, dielectric loss, and leak
loss caused by atomic polarization of the alum. In the limited
time available for this study, we were able to rule out the
occurrence of potentially negative effects on the alum
dielectric characteristics due to several factors, including
chemical reaction in the DFDS due to the main additive sodium
bicarbonate and physical effects in the dough during the
proofing and frying processes. It was not possible to include
other potential factors. To further popularize the new technology,
other applications of the differential dielectric spectrum
method need to be developed aimed at other
nonaqueous ingredients. The new component testing method
also needs to be constantly improved and upgraded in future