Chitosan in its solid form (film, fiber or particles) holds promising
values in many applications for which interfacial contact
inhibition is sufficient, although its bactericidal action is only
favorable in acidic media (pH < 6.5) when most of its amino
groups hold their cationic character. As a means to permanently
introduce a positive charge to solid chitosan, without having
to incorporate additional cationic species or altering the processability
of chitosan, heterogeneous quaternization seems to
be an attractive approach. The reactions can be accomplished
in the absence of tedious purification process that are certainly
required if the quaternization is done homogeneously in solution.
Chitosan can be fabricated into the desired solid form (film,
fiber or particle) prior to the surface modification. Previously,
we have demonstrated that it is conceivable to tune the surface
properties of chitosan, namely hydrophilicity/hydrophobicity, and
protein adsorption, by chemical modification of the chitosan surface
by choosing the suitable reagents under a heterogeneous
condition
Chitosan in its solid form (film, fiber or particles) holds promisingvalues in many applications for which interfacial contactinhibition is sufficient, although its bactericidal action is onlyfavorable in acidic media (pH < 6.5) when most of its aminogroups hold their cationic character. As a means to permanentlyintroduce a positive charge to solid chitosan, without havingto incorporate additional cationic species or altering the processabilityof chitosan, heterogeneous quaternization seems tobe an attractive approach. The reactions can be accomplishedin the absence of tedious purification process that are certainlyrequired if the quaternization is done homogeneously in solution.Chitosan can be fabricated into the desired solid form (film,fiber or particle) prior to the surface modification. Previously,we have demonstrated that it is conceivable to tune the surfaceproperties of chitosan, namely hydrophilicity/hydrophobicity, andprotein adsorption, by chemical modification of the chitosan surfaceby choosing the suitable reagents under a heterogeneouscondition
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