新巻鮭に見られた燐酸塩結晶に就て

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Studies on the struvites in canned marine products were frequenfly reported, but little is known about the presence of sodium phosphate in fisheries products. In the present paper, an occurrence of sodium phosphate (Na2HPO4•12H2O) in mild-cured salmon is described. The writer found a small quantity of transparent prismatic crytals, which resemled pieces of ice, deposited on superficial skin near the dorsal and ventral fins and sometimes on the thin membranes of abdominal cavities of the fishes, which were commercialy processed and kept in cold store-house, Tokyo, in the winter of 1942. (Plate 1) Probably owing to dehydration, transparency of the crystal was gradually reduced under atmospheric condition. By the recrystallisation, usually prismatic form could not be reappeared and it took a rhombic shape or a parallelogram. (Plate 2) The optical characters tested by a petrographic microscope were as follows: the crystalline system is monoclinic, as both straight and oblique extinction can be observed; angle of extinction is 31°; and sign of elongation is negative. The writer confirmed that these characteristics as well as analytical data were quite identical with those of the pure specimens of sodium phosphate examined simultaneously. It is not yet clear what sort of conditions have favoured the deposition of sodium phosphate in mild-cured salmon instead of struvite.
公益社団法人日本水産学会の論文