All color data are expressed as Hunter L, a, and b values
corresponding to lightness, redness, and yellowness, respectively.
Hunter-lab color values of cake contained substituted
flour at different levels of watermelon rind and sharlyn melon
peel powder are given in Table 6. Crust and crumb color of
cakes varied with the quantity and the kind of the supplemented
materials the crust became lighter (higher L) as the
watermelon rind and sharlyn melon peel powders level increased
compared to that of control cake. No considerable differences
in crust yellowness were found among the different
watermelon rinds samples, while sharlyn melon peels samples
exhibited higher b values than the respective watermelon rinds
samples, both gave higher b values than the control cake
sample.
Concerning crumb color, in generally, as watermelon rinds
powder level increased L and b values decreased while a
value increased and the crumb color became darker and more
greenish. However as the level of sharlyn melon peels powder
increased L and a values decreased, while b value showed an
increasing trend, indicating that a darker, more then less redder,
and more yellowness crumb. The crumb of the control
cake was lighter and more yellow compared to the tested
cakes. It was well known that during cake baking, the crumb,
dose not reach a degree crumb does not reach adgree above
100 C, so the Millard or caramelization reactions fail to take
place. Therefore, the resulted of crumb color of tested cake was
due to the color of the used substituted materials and their
interactions. Im and Kim (1999) also reported that, the addi