Enzymatic modification and characterization of xylo-oligosaccharide esters as potential emulsifiers
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 degre...
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| Main Authors: | , |
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| Format: | Journal Contribution |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://agris.upm.edu.my:8080/dspace/handle/0/10965 |
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| Summary: | 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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