Research on the Color Changes of Sargassum fusiforme During Blanching Treatment

Abstract:

In this paper，effect of blanching treatment on the color of Sargassum fusiforme was studied by the combined analysis of pigment contents and absorption spectra. Results showed that a higher value of Hue was observed and the color changed from brown to bright green after fresh S. fusiforme was blanched in water at 98 ℃. A significant decrease in Hue value and an increase in a* value were found with the increasing blanching time，indicating a loss of greenness. Chlorophyll and carotenoids in S. fusiforme were degraded significantly during the blanching，and the contents of them decreased from 0.72，0.20 mg/g fresh weight to 0.29，0.09 mg/g after 300 s，respectively. Blanching treatment led to a shift of the red absorption maximum of chlorophyll a and c，and the absorbance decreased gradually with the treatment time. The absorption peak of chlorophyll a and c at 432 nm and 582 nm disappeared after blanched for 60 s. Fucoxanthin showed a maximum absorption at 534 nm. However，the absorbance was not significant difference with the change of blanching treatment time.