Journal of Nutritional Science and Vitaminology
Online ISSN : 1881-7742
Print ISSN : 0301-4800
ISSN-L : 0301-4800
Release and Uptake of Vitamin B12 by Asakusanori (Porphyra tenera) Seaweed
Shoji YAMADAMayumi SASA(KAMASUZU)Keiko YAMADAMorimichi FUKUDA
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1996 Volume 42 Issue 6 Pages 507-515

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Abstract

When asakusanori was incubated in artificial seawater, it released a significant amount of vitamin B12. The rate of release was very high at the beginning of incubation and steeply decreased. Four-fifths of the released B12 was a macromolecule-bound form and the rest was free form, of which some were taken up by the asakusanori tissue. Asakusanori took up the free form B12 from the incubation medium by concentration and temperature-dependent processes. The amount of uptake increased with the time of incubation and did not attain a plateau after 4h. The capacity was retained even after storage in frozen state for 11 months.

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