physicochemical and functional properties of crawfish chitosan as ...

chitosan samples, we arbitrarily determined that DMPCA was the most efficient to remove color
than others, based on visual observation.
4.11 Water Binding Capacity (WBC)
Water binding capacity of crawfish and commercial chitosans is shown in Table 7. WBC
differed among crawfish chitosan samples, ranging from 660.6 % to 745.4%, excluding the
DMPAC (274.2%). These values were in agreement with those reported by Rout (2001) where
WBC for chitosans ranged from 581 to 1,150% with an average of 702%.
Table 7. Water Binding Capacity of Crawfish and Commercial Chitosans
Sample WBC (%)
DCMPA 660.6 (9.97) c
DMCPA 673.8 (17.68) c
DMPCA 745.4 (17.99) b
DMPAC 274.2 (4.04) e
DPMCA (control) 694.4 (14.06) c
Vanson 75 941.5 (20.87) a
Sigma 91 548.7 (11.99) d
Numbers in parentheses are standard deviations. Means with different letters in each
column are significantly different (p < 0.05). DCMPA=decolorized, demineralized,
deproteinized, deacetylated; DMCPA= demineralized, decolorized, deproteinized,
deacetylated; DMPCA= demineralized, deproteinized, decolorized, deacetylated;
DMPAC= demineralized, deproteinized, deacetylated, decolorized; and DPMCA=
deproteinized, demineralized, decolorized, deacetylated. Commercial chitosan sample
(Vanson75 and Sigma91).
Cho and No (1998) reported the WBC range of 458% to 805% for five commercial
chitosans from shrimp and crab shell. There was no difference in WBC of DCMPA, DMCPA,
and DPMCA. DMPCA had a slightly higher WBC (745.4 %) than that of DPMCA, DMCPA,
and DCMPA (694.4 %, 673.8 %, and 660.6 %, respectively). DMPAC showed poor WBC of
274.2 %. Vanson75 revealed a higher WBC (941.5%) than that of Sigma91 (548.7%) and our
crawfish chitosan samples.
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