Studies on Greening of Canned Shellfishes

Part III. Comparison between the physico-chemical property of the green pigments of raw oysters and that of canned ones

Abstract

Considering that raw oysters may contain the precursor or the same pigments found in canned ones, the physico-chemical property of the green pigments of raw oysters was compared to that of canned ones. By extraction with hydrochloric acid-acetone mixture, followed by the purification method adopted in case of canned ones, the green pigments of raw ones were separated into five components as in case of the former.
From the experimental results obtained by absorption spectral analysis, thin layer chromatography, solubility test, infra-red spectral analysis and micro elemental analysis, it is concluded that the above consideration is correct.