Enzymatic modification and characterization of xylo-oligosaccharide esters as potential emulsifiers

Udomrati S., . and Gohtani S., . Enzymatic modification and characterization of xylo-oligosaccharide esters as potential emulsifiers. pp. 818-825. ISSN 22317546

Hydrophobically modified xylo-oligosaccharides were prepared by enzymatic esterification of xylo-oligosaccharide and three fatty acids: decanoic acid (C-10) lauric acid (C-12) and palmitic acid (C-16). Lipase obtained from Thermomyces lanuginosus was used as a biocatalyst in the reaction. The degree of substitution (DS) of esterified xylo-oligosaccharide prepared at a reaction temperature of 60oC for 4 h ranged between 0.042 and 0.066. Esterified xylo-oligosaccharides were investigated for physicochemical properties. The esterified xylo-oligosaccharides reduced the interfacial tension and exhibited emulsifying properties. Esterified samples did not completely dissolve in water showed higher viscosity and changed thermal properties compared with native samples. At a concentration of 25 (w/w) esterified xylo-oligosaccharides exhibited Newtonian flow behavior similar to that of native one except for palmitate derivatives which exhibited shear-thinning behavior. Esterified xylo-oligosaccharides were then used as emulsifiers to make n-hexadecane O/W emulsions. The emulsions were characterized according to their oil droplet characteristics emulsification index and centrifugal force-induced oil separation. Xylo laurate has potential in emulsifying activity and in preserving the stability of emulsions after centrifugal acceleration.

Full text available from: Official URL: http://ifrj.upm.edu.my/22%20(02)%202015/(51).pdf

Abstract

Hydrophobically modified xylo-oligosaccharides were prepared by enzymatic esterification of xylo-oligosaccharide and three fatty acids: decanoic acid (C-10) lauric acid (C-12) and palmitic acid (C-16). Lipase obtained from Thermomyces lanuginosus was used as a biocatalyst in the reaction. The degree of substitution (DS) of esterified xylo-oligosaccharide prepared at a reaction temperature of 60oC for 4 h ranged between 0.042 and 0.066. Esterified xylo-oligosaccharides were investigated for physicochemical properties. The esterified xylo-oligosaccharides reduced the interfacial tension and exhibited emulsifying properties. Esterified samples did not completely dissolve in water showed higher viscosity and changed thermal properties compared with native samples. At a concentration of 25 (w/w) esterified xylo-oligosaccharides exhibited Newtonian flow behavior similar to that of native one except for palmitate derivatives which exhibited shear-thinning behavior. Esterified xylo-oligosaccharides were then used as emulsifiers to make n-hexadecane O/W emulsions. The emulsions were characterized according to their oil droplet characteristics emulsification index and centrifugal force-induced oil separation. Xylo laurate has potential in emulsifying activity and in preserving the stability of emulsions after centrifugal acceleration.

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Item Type:	Article
AGROVOC Term:	Enzymatic activity
AGROVOC Term:	Emulsification
AGROVOC Term:	Oligosaccharides
AGROVOC Term:	Emulsifiers
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/22084

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