Carboxymethylation of Sago Starch and Sago Waste and the Formation of Carboxymethyl Starchhydrogel Via Irradiation Technique
Carboxymethyl starch (CMS) and carboxymethyl sago waste (CMSW) were synthesized in completely heterogeneous conditions as a product of the reaction of sago starch or sago waste and sodium monochloroacetate (CICH₂COONa) in isopropanol and sodium hydroxide (NaOH). The influence of various parameter...
محفوظ في:
| المؤلف الرئيسي: | |
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| التنسيق: | أطروحة |
| اللغة: | English English |
| منشور في: |
2003
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| الموضوعات: | |
| الوصول للمادة أونلاين: | http://psasir.upm.edu.my/id/eprint/9564/1/FSAS_2003_25.pdf |
| الوسوم: |
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| الملخص: | Carboxymethyl starch (CMS) and carboxymethyl sago waste (CMSW) were
synthesized in completely heterogeneous conditions as a product of the reaction of sago
starch or sago waste and sodium monochloroacetate (CICH₂COONa) in isopropanol and
sodium hydroxide (NaOH). The influence of various parameters on the degree of
substitution (DS) was determined. The optimum conditions obtained for CMS were as
follows: NaOH concentration, 20% w/v; reaction time, 1 h; reaction temperature, 55°C;
and amount of CICH₂COONa, 1.5 mole. Meanwhile the optimum conditions for
carboxymethylation of sago waste were as follows: NaOH concentration, 25 % w/v;
reaction time, 2 h; reaction temperature, 55°C; and amount of CICI-bCOONa, 2.0 mole.
The DS and reaction efficiency (RE) under optimum conditions for CMS were 1.05 and·
85.9%, respectively, whereas for CMSW were 1.04 and 79.5%, respectively. |
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