Preparation and physicochemical properties of octenyl succinic anhydride (OSA) modified sago starch; [Penyediaan dan sifat fizikokimia oktenil suksinat anhidrat (OSA) modifikasi kanji sagu]

• Published in: Malaysian Journal of Analytical Sciences
• Main Author: Abiddin N.F.Z.; Yusoff A.; Ahmad N.
• Format: Article
• Language: English
• Published: Malaysian Society of Analytical Sciences 2016
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982275949&doi=10.17576%2fmjas-2016-2004-13&partnerID=40&md5=e34d71a47708de12f687df76189c1c46

Starch from sago (Metroxylon sagu) was esterified with octenyl succinic anhydride (OSA) in order to regulate its shortcoming by adding amphiphilic properties. The objective of this work is to determine the physicochemical properties of native sago and OSA sago starches. The OSA sago starch was produced according to the optimum condition generated via response surface methodology (RSM) with 5.00 % OSA at pH 7.20 and a reaction time of 9.65 hours. The esterified sago starch gives a degree of substitution (DS) value of 0.012. The physicochemical properties of OSA sago starch was determined by measuring the amylose content, laser diffraction particle size analyzer, scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). The amylose content for OSA sago starch was found to be reduced after esterification reaction. The particle size of OSA sago starch was found to increase significantly (p < 0.05) compared to their native starches. Scanning electron microscopy (SEM) revealed that OSA starch developed slightly rough surface and their edges lost some definition. FT-IR spectroscopy shows that there was appearance of new absorption correspond to ester carbonyl group (1717 cm-1) and carboxylate RCOO- (1569 cm-1). This study showed that the physicochemical properties of modified starches were influenced not only by DS but also on the botanical origin of the starches. © 2016, Malaysian Society of Analytical Sciences. All rights reserved.