Abstract
An apparatus for wet ashing of algal materials was devised to prevent the loss of selenium. The recovery was 93 to 97%, when 1.0g of the dried laver containing 1.0 to 5.0μg of selenium was analyzed with apparatus. The selenium contents of 17 species of air-dried marine algae, which had been kept for 2 years, ranged from 0.1 to 1.1ppm. In 6 fresh specimens of 4 species of marine algae, the values ranged from 0.35 to 1.3ppm and were nearly proportional to their nitrogen contents. Approximately 90% of selenium in Porphyra yezoensis was found in the fractions insoluble in both hot 70% ethanol and hot water, and 77% of it in the protein fraction precipitated at 70% ethanolic concentration from the cold water extract. The optimum concentration of selenium in the medium was found to be 0.003ppm for the growth and nitrogen accumulation in P. yezoensis.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
