アコヤガイおよびイケチョウガイの生化学的研究-X : 貝殼中のMnの形態について

概要

論文の詳細を見る
When cultured pearls are subjected to the neutron irradiation, the color changes from common colors such as white, silver, pink, cream, gold to black or blue one. In this coloration, blackish pigment is found chiefly in the nucleus which is made of shell of fresh water clam, containing comparatively large amount of Mn. To clarify the effects of Mn on black coloration of the nucleus by neutron irradiation, the states of Mn compounds in shell were investigated with following results. Those results seen in Table 1-3 suggest that the great part of Mn in the shell of fresh water clam exists as MnCO3 and its oxides, and the coloration of nucleus by neutron irradiation is due to the blackish color of Mn oxides which were derived from MnCO3. On the other hand, large amount of acid soluble pigment as well as Mn distributes in the periostracum and prismatic layer of pearl oyster and of black lipped pearl oyster, but there was found no evidence for of Mn-pigment complex (see Table 1, 2, 4).
公益社団法人日本水産学会の論文