Color Development of Squid Skin as Affected by Oxygen Concentrations
2009
Kinoshita, Y. | Yoshioka, T. | Kato, S. | Konno, K.
Color development of squid skin was controlled by O₂ concentration for storage. When stored above 10% O₂, the color index (CI) as an index of color development of skin increased in 24 h, and decreased gradually with further storage. The CI profile at 10% O₂ was practically identical to that in air. When stored at 0.1% O₂, in the presence of N₂, the CI increased partly in 6 h and decreased. Morphological observation of chromatophore distinguished the CI increase at 0.1% and 10% O₂ by their shape and size distribution. However, the storage of squid at O₂ concentration between 2.5% and 7% practically did not change the CI for at least 48 h. ATP content of skin was kept unchanged when the storage atmosphere contained O₂ concentration at 2.5% up to 48 h, while the content decreased rapidly with a half decrease in 6 h when stored at 0.1% O₂. It was demonstrated clearly that ATP is regenerated in the presence of O₂, but the ATP concentration did not determine the CI change during the storage. Exposure to high concentration of O₂ might induce a full color development of squid skin.
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