Microencapsulation of Linoleic Acid with Low- and High-molecular-weight Components of Soluble Soybean Polysaccharide and Its Oxidation Process

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  • FANG Xu
    <i>Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University</i>
  • WATANABE Yoshiyuki
    <i>Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University</i>
  • ADACHI Shuji
    <i>Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University</i>
  • MATSUMURA Yasuki
    <i>Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University</i>
  • MORI Tomohiko
    <i>Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University</i>
  • MAEDA Hirokazu
    <i>New Ingredients Research Institute, Fuji Oil Co., Ltd.</i>
  • NAKAMURA Akihiro
    <i>New Ingredients Research Institute, Fuji Oil Co., Ltd.</i>
  • MATSUNO Ryuichi
    <i>Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University</i>

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Description

Soluble soybean polysaccharide (SSPS) was fractionated into its low- (LMW) and high-molecular-weight (HMW) components to test their antioxidative and emulsifying properties. Linoleic acid was emulsified with an aqueous solution of SSPS, HMW, a mixture of LMW or HMW with maltodextrin, or maltodextrin alone. The emulsions prepared with SSPS, HWM and the mixture of HMW with maltodextrin were stable. These emulsions were spay-dried to produce microcapsules. The encapsulated linoleic acid was oxidized at 37°C and at various levels of relative humidity. Linoleic acid encapsulated with the mixture of LMW with maltodextrin or HMW was stable to oxidation, and this stability increased as the weight fraction of LMW in the mixture was increased. The LMW components also had high DPPH-radical scavenging activity. These results indicate that LMW played an important role in suppressing or retarding the oxidation of linoleic acid encapsulated with SSPS. The oxidative stability of linoleic acid encapsulated with a mixture of the LMW and HMW components was high at low and high relative humidity, but not at intermediate levels of relative humidity.<br>

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