Carboxymethylated sago starch nanoparticles: influence of reaction parameters on degree of substitution

• Main Author: Sit, Johnson
• Format: Final Year Project Report
• Language: English
• Published: Universiti Malaysia Sarawak, (UNIMAS) 2015
• Subjects: S Agriculture (General); SB Plant culture
• Online Access: http://ir.unimas.my/id/eprint/10812/8/Sit%20Johnson%20%28fulltext%29.pdf; http://ir.unimas.my/id/eprint/10812/
• Institution: Universiti Malaysia Sarawak

Carboxymethyl sago starch (CMSS) was synthesized in aqueous medium under various reaction conditions. The influence of sodium hydroxide (NaOH), mole ratio of sodium monochloroacetate (NaMCA) to starch, reaction temperature and reaction duration were evaluated for degree of substitution by direct titration. The ideal optimum conditions based on the investigation is 20 % NaOH; mole ratio of NaMCA/Starch is 1.4; 60 °C for dissolution and etherification temperature respectively; 3 hrs for dissolution and etherification duration, respectively. Carboxymethyl sago starch nanoparticles with degree of substitution (DS) of 1.33 was synthesized via simple nanoprecipitation and characterized by Fourier transform infrared (FTIR) and scanning electron microscope (SEM).