The influence degree of substitution on the physicochemical properties of acetylated arenga starches

Abdul Rahim, . and Syahraeni Kadir, . and Jusman, . The influence degree of substitution on the physicochemical properties of acetylated arenga starches. pp. 102-107. ISSN ISSN(Online):22317546

Chemical modification is usually carried out to overcome the unstable properties of native arenga starch and improve its physicochemical properties during processing. In this study acetylation of arenga starch was carried out. Native arenga starch was acetylated with acetic anhydride at 5 10 15 and 20 (starch basis sb) in aqueous slurry at pH 7 8 9 and 10. Acetyl percentage (Ac) degree of substitution (DS) fourier transform infrared spectroscopy (FTIR) spectra crystallinity water and oil holding capacity (WHC and OHC) swelling power and solubility of the native and modified arenga starches were investigated. The results indicated that Ac and DS of acetylated arenga starches prepared with combination of acetic anhydride 15 (sb) and pH 8 was 6.221 and 0.249 which was the highest value among those prepared at any others. The FTIR spectra of modified starches resulted in the acetyl group incorporation with the starch as shown by absorption of the ester carbonyl group at band 1720 cm-1. The X-ray diffraction revealed that increasing of DS was related to decreasing of crystallinity. The WHC OHC swelling power and solubility of acetylated arenga starches increased with increasing of DS indicate increasing in both hydrophilicity and hydrophobicity of the starches.

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Abstract

Chemical modification is usually carried out to overcome the unstable properties of native arenga starch and improve its physicochemical properties during processing. In this study acetylation of arenga starch was carried out. Native arenga starch was acetylated with acetic anhydride at 5 10 15 and 20 (starch basis sb) in aqueous slurry at pH 7 8 9 and 10. Acetyl percentage (Ac) degree of substitution (DS) fourier transform infrared spectroscopy (FTIR) spectra crystallinity water and oil holding capacity (WHC and OHC) swelling power and solubility of the native and modified arenga starches were investigated. The results indicated that Ac and DS of acetylated arenga starches prepared with combination of acetic anhydride 15 (sb) and pH 8 was 6.221 and 0.249 which was the highest value among those prepared at any others. The FTIR spectra of modified starches resulted in the acetyl group incorporation with the starch as shown by absorption of the ester carbonyl group at band 1720 cm-1. The X-ray diffraction revealed that increasing of DS was related to decreasing of crystallinity. The WHC OHC swelling power and solubility of acetylated arenga starches increased with increasing of DS indicate increasing in both hydrophilicity and hydrophobicity of the starches.

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Item Type:	Article
AGROVOC Term:	Arenga
AGROVOC Term:	Starch
AGROVOC Term:	Physicochemical properties
AGROVOC Term:	Acetylation
AGROVOC Term:	X rays
AGROVOC Term:	Crystallization
AGROVOC Term:	Swelling
AGROVOC Term:	Solubility
AGROVOC Term:	Hydrophilicity
AGROVOC Term:	Hydrophobicity
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23253

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