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《Oceanologia Et Limnologia Sinica》 1988-01
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STUDIES ON THE COMPOSITION OF ALGINATES IN LAMINARIA JAPONICA

Fan Xiao, Zheng Naiyu and Zhang Yanxia(Institute of Oceanology, Academia Sinica, Qingdao)  
On the basis of the results of Whyte's work, the alginates were almost totally retained in residual algal tissues, but fucoidan was leached from algal tissues after seaweeds were leached with freshwater. Quantitative determination of alginic acid and bound-metal elements after exhaustive distilled water leaching was carried out and compared with the content of metal elements in seawater. Results obtained may be summarized as follows. 1. Bound Metals with Alginic AcidAnalytical result demostrated that the alginates in Laminaria japonica occur as soluble (or insoluble) salts with major metal elements, such as potassium, sodium, magnesium, calcium, lithium, strontium and trace elements, such as boron, manganese, copper, iron, nickel, lead, chromium, silver, vanadium, cobat, cadmium, bismuth, titanium, zinc, selenium, yttrium.2. Percentage of Various AlginatesThe percentage of Magnesium alginate was the highest in the total alginates as listed below:magnesium alginate Mg(Alg)2 32.31%potassium alginate KAlg 28.30%sodium alginate NaAlg 21.61%calcium alginate Ca(Alg)2 16.25%lithium alginate LiAlg 0.55%boron alginate B(Alg)3 0.48%strontium alginate Sr(Alg)2 0.46%other trace metal salt M(Alg)n 0.04% 3.List of elements in Seawater and algal tissue
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