The biological role of chitosan which was prepared by chemical method from
shrimp waste Penaeus semisulcatus and the outer skeleton for marine crab Portunus
pelagicus in some industrial and agricultural applications were studied. The
concentration
of prepared chitosan was 1% (w/v) at pH (4 and 8) for 12 hours in
precipitation and chelating heavy metals (Lead, Zinc, Iron, Cupper and Cadmium)
from of sewage water. Concentration of elements was measured by Flame Atomic
Absorption Spectrophotometer ) FAAS). The results of the study indicated that the
concentration of the water elements was high before treated with chitosan. The
results showed a significant (p<0.05) decrease in element concentration percentage
after treated with crab chitosan. In contrast, shrimp chitosan displayed a minimum
effect on decreasing the amount of heavy metals. Moreover, the results showed that
the higher percentage for mineral adsorption was at pH (4 as compared with 8).
The results confirmed the possibility of using chitosan in chelate and precipitate the
mineral ions from polluted water.
In this paper, the chemical structure of chitosan has been
modified by trans esterification reaction with methyl esters both of
octanoic and dodecanoic acid, using potassium carbonate as a based
catalyst, the degree of substitution has been determ
inated to change
hydrophilic properties, Some physical properties of trans
esterification products has been determined by measuring the
Kinematic viscosity, degree of turbidity and density of their water
solutions.
The research was conducted in order to test the effect of each of the
filtrate T. viride and chitosan and sodium benzoate in filamentous
growth pathogenic fungi F. oxysporum and F. solani, and their
impact in protecting the seeds of peppers from t
hese two fungi, and
then assess the effectiveness of peroxidase enzyme in pepper plants
from seeds treated with the above-mentioned compounds.
The aim of this study was evaluation the effective of chelating
solutions 17% EDTA, 0.2% Chitosan and 10% Sodium citrate by
comparing the concentrations of chelated calcium ions after
(1min-5min-24h) of application. The study was performed on 45
extracted single-rooted sound human. The sample was randomly
divided into groups (n=3), each group 15 teeth that depend on the
used solution.
The production of chitosan polymer had been cheaply optimized from
collected shrimp shell wastes collected from Syrian local sources and the
yielded chitosan was modified by subjecting molecules to the process of linking
the enzymatic partial and
to phenol compounds oxidation residues called
quinines. The phenol oxidation was done by Laccase enzyme extracted from
olive mill solid wastes (Pyrene) and liquid (jift). The amount of extracted
phenols from liquid waste was more successful than the solid wastes and thus, it
was chosen as a rich source of phenols for being grafted on the chitosan since
both of phenols and quinones had a strong activity towards pathogenic
microbes. Films were fabricated from the chitosan that was functionalized with
quinones. Thus, a double barrier was designed against pathogenic microbes
that usually attack uncovered red and white fresh meat in the slaughters and
selling places. On the other hand, the research was mainly based on recycling
the shrimp shells and olive mill residues that are useless and environmental
pollutants.
