Ion-exchange properties of cell walls of red seaweed <Emphasis Type="Italic">Phyllophora crispa</Emphasis> |
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Authors: | N R Meichik N I Popova Yu I Nikolaeva I P Yermakov A N Kamnev |
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Institution: | 1.Department of Plant Physiology, Biological Faculty,Moscow State University,Moscow,Russia |
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Abstract: | Research into ion-exchange properties of cell walls isolated from thallus of red seaweed Phyllophora crispa was carried out. Ion-exchange capacity and the swelling coefficient of the red alga cell walls were estimated at various
pH values (from 2 to 12) and at constant ionic strength of a solution (10 mM). It was established that behavior of cell walls
as ion-exchangers is caused by the presence in their matrix of two types of cation-exchange groups and amino groups. The amount
of the functional group of each type was estimated, and the corresponding values of pK
a
were calculated. It can be assumed that ionogenic groups with pK
a
∼5 are carboxyl groups of uronic acids, and ionogenic groups with pK
a
∼7.5 are carboxyl groups of the proteins. Intervals of pH in which cation-exchange groups are ionized and can take part in
exchange reactions with cations in the environment are defined. It was found that protein was a major component of cell wall
polymeric matrix because its content was 36%. |
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Keywords: | |
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