Effect of Phytosterol on Structural Stability and Thermal Oxidation Characterization of Soybean Oil Oleogels
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(1.College of Biological Science and Engineering,Fuzhou University,Fuzhou 350108;2.Fujian Tianma Science and Technology Group Co.,Ltd.,Fuzhou 350308)

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    Abstract:

    The effect of phytosterol organogelators (β-sitosterol:γ-oryzanol=2:3,m:m) on the network structure and oxidation characteristics of soybean oil oleogels were studied.The results showed that when the addition amount of phytosterol organogelators was within the range of 2% to 10%,the storage modulus (G') of soybean oil oleogels of 6% was always higher than loss modulus (G''),which indicated that the system had formed a stable solid-like gel structure.Polarized light microscopy showed that 6% oleogels appeared a regular and compact aggregation state after stored at 45 ℃ for 10 days,with a peroxide value of 15.59 mmol/kg,a malondialdehyde content of 1.49 mg/kg,and a headspace oxygen consumption of 24.19%,showed the best oxidation stability.2% to 10% of β-sitosterol or γ-oryzanol was added to soybean oil respectively,the headspace oxygen consumption of the sample showed that β-sitosterol had an anti-oxidant effect,and γ-oryzanol had a pro-oxidant effect.After heated at 180 ℃ for 2.5 hours,the headspace oxygen consumption of 6% phytosterol oleogels was 5.00% lower than the control,showed a good thermal oxidation stability.Meanwhile,both Rao and Rad acquired from 1H NMR spectra had a good positive correlation with the total oxidation value of phytosterol oleogels during the thermal oxidation at 70 ℃.

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History
  • Received:January 07,2021
  • Revised:
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  • Online: February 11,2022
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