Based on hue angle (departure from the true red axis of the CIE
color space), control and AA-containing samples were the reddest
(pb0.05) initially (hue angle about 66°; Fig. 6b). The hue angles of
these samples increased (pb0.05) the most over the 4 month storage
period (to about 76°) indicating that they were diverging away from
the true red axis of the CIE color space (CIE, 1978). GSE-containing
samples had hue angles between 70° and 72° both initially and at the
end of the storage period. These samples were cooked, so any changes
in redness (to browness) would have occurred during initial cooking,
however these data demonstrate that GSE-containing samples better
preserved the initial color of the samples. Chroma, which is a measure
of the intensity of color, ranged from 17 to about 25 at the initiation of
the study (Fig. 6). Color saturation of GSE100- and AA-containing
samples was highest (pb0.05) at the initiation (24–25) while those of
GSE300- and GSE500-containing samples were lowest (17–19;
pb0.05). Chroma of all samples decreased, especially during the
first 2 months of storage. Chroma was most stable throughout the storage period in samples containing the higher levels of GSE
(300 ppm and 500 ppm).