
%0 Journal Article
%A Madgwick, JC 
%A Ralph, BJ 
%T Chemical composition of the Australian bull kelp, <I>Durvillea potatorum</I>
%J Marine and Freshwater Research
%D 1972/04/01
%V 23
%N 1
%P 11-16
%K 
%R https://doi.org/10.1071/MF9720011
%U https://www.publish.csiro.au/paper/MF9720011 
%X The chemical composition of the Australian bull kelp, Durvillea potatorum, was determined. As a percentage of the whole stipe dry weight, components were: Crude fibre, 57.40 %; alginic acid, 35.15 % ; "cellulosic" polysaccharide, 22.61 % ; laminarin, 1.79 %; mannitol, 3.20%; nitrogen, 1.21 %; ash, 28.09 %; insoluble ash, 8.81 %; Ca2+, 1.47%; Mg2+, 0.44%; Na+, 1.45%; K+, 3.36%; PO42-, 5.15%; Cl-, 5.87%; SO4-, 3.49 %; I-, 0.25%; and chlorophyll, 0.01 %.  Tissue fractionation showed that the peripheral layer contained approximately two-thirds of the total chlorophyll and three-quarters of the total phenolic compounds, but only one-tenth of the total alginic acid. In whole stipes up to two-thirds of the alginic acid was in a soluble form. 
