MATERIALS & METHODS
Sample of chitosan (CS) prepared from shells of
prawns was kindly donated from Organic Synthesis
Laboratory, Department of Chemistry, Institut
Teknologi Bandung, Indonesia. Acetic acid and
tetraorthosilicate (TEOS) were purchased from Aldrich.
Sodium hydroxide and hydrochloric acid used to adjust
pH was purchased from Merck. Water used was
generated from aqua demineralization system. All
materials were used without further purification.
Chitosan was dissolved in 1 % acetic acid solution to
produce a 1 wt% chitosan solution. This solution was
stirred for 24 hours at room temperature to form a
homogeneous mixture. For cross linking chitosan with
silica, a solution of TEOS was prepared by mixing the
ethanol, water and TEOS with the ratio of
TEOS:ethanol:water was 2:2:1. This solution was
allowed stirring for 1.5 hours at room temperature. To
this solution, the previously prepared chitosan
solutions were added with the ratio of chitosan:TEOS
was 1:4 and stirred for 1.5 hour at room temperature.
The resulting solution was cast onto a Petri disk (with
diameter of 10 cm) and dried at ambient temperature
for 24 hours. After that, the resulting CSC was washed
MATERIALS & METHODS
Sample of chitosan (CS) prepared from shells of
prawns was kindly donated from Organic Synthesis
Laboratory, Department of Chemistry, Institut
Teknologi Bandung, Indonesia. Acetic acid and
tetraorthosilicate (TEOS) were purchased from Aldrich.
Sodium hydroxide and hydrochloric acid used to adjust
pH was purchased from Merck. Water used was
generated from aqua demineralization system. All
materials were used without further purification.
Chitosan was dissolved in 1 % acetic acid solution to
produce a 1 wt% chitosan solution. This solution was
stirred for 24 hours at room temperature to form a
homogeneous mixture. For cross linking chitosan with
silica, a solution of TEOS was prepared by mixing the
ethanol, water and TEOS with the ratio of
TEOS:ethanol:water was 2:2:1. This solution was
allowed stirring for 1.5 hours at room temperature. To
this solution, the previously prepared chitosan
solutions were added with the ratio of chitosan:TEOS
was 1:4 and stirred for 1.5 hour at room temperature.
The resulting solution was cast onto a Petri disk (with
diameter of 10 cm) and dried at ambient temperature
for 24 hours. After that, the resulting CSC was washed
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