It is shown in Table 5 that the color values (L*, a*, and b*) of
milled rice samples were not significantly different (p > 0.05)
before and after RF treatment during the whole storage period.
These results showed that the loss of saleable color could be
negligible during RF treatment for disinfestations. Similar studies
are also reported by Suhem et al. (2013) and Theanjumpol et al.
(2007), showing that the RF technology do not affect the color
quality of rice samples. The increasing in b* values of milled rice
samples during storage are due to lipid oxidation (Park et al., 2012).
The result is consistent with that observed by Kim et al. (2004), in
which the phenomenon is resulted from the acceleration of Mailard
reaction between the protein and sugar contents of milled rice.
Furthermore, Dillahunty et al. (2000) reported that the temperature and treatment duration did not affect the yellowing of rice
when it was treated with temperature over 50 C for less than 12 h.