BIOCHEMICAL STUDIES ON PTERIA (PINCTADA) MARTENSII (DUNKER) AND HYRIOPSIS SCHLEGELII (v. MARTENS)-IX:TRACE COMPONENTS IN THE SHELLS OF SHELLFISH (PART 2)

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In succession to the previous report (part 1)1), organic matter and anionic elements in the shells of shellfish were analyzed with following results. 1) As shown in Table 1, an appreciable difference in the N content between the iridescent shells (more than 0.27 per cent) and uniridescent ones (less than 0.08 per cent) may suggest that the iridescence of shells is originated from N compound, perhaps chochiolin. 2) Reducing sugar of 1.25 to 8.00 per cent was obtained from chonchiolins, and proved to be composed mostly of hexosamine (Table 2). 3) As for S divided by the solubility in acid, the most part of acid-soluble S existed as organic form in nacreous layer but existed as sulfate in shells of baby clam and jiant clam. 4) The great part of P in shells existed as acid insoluble form (organic P).
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