植物甾醇对其凝胶化大豆油结构稳定性和热氧化特性的影响
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(1.福州大学生物科学与工程学院 福州 350108;2.福建天马科技集团股份有限公司 福州 350308)

作者简介:

林荣发(1997—),男,硕士生

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国家自然科学基金面上项目(31771936)


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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    摘要:

    研究植物甾醇凝胶剂(β-谷甾醇与γ-谷维素质量比2:3)对大豆油凝胶网络结构及氧化特性的影响。结果表明,在植物甾醇凝胶剂添加量为2%~10%(质量分数)时,6%及以上的凝胶化大豆油的G′始终大于G″,说明体系已形成稳定的类固体凝胶结构。偏振光显微镜显示,6%凝胶化大豆油在45 ℃贮藏10 d时,呈现规则且紧密的聚集态,其过氧化值为15.59 mmol/kg,丙二醛含量为1.49 mg/kg,顶空耗氧量为24.19%,氧化稳定性最好。分别添加2%~10%的β-谷甾醇或γ-谷维素,顶空耗氧量显示β-谷甾醇起到抗氧化的作用,γ-谷维素起到促氧化作用。180 ℃下加热2.5 h,6%植物甾醇凝胶化油脂的顶空耗氧量比对照组低5.00%,显示其良好的热氧化稳定性。70 ℃热氧化过程中,基于核磁共振氢谱的峰面积积分比值Rao、Rad与凝胶化大豆油的总氧化值具有良好的正相关性。

    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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林荣发,钟晓芳,戴美娜,刘祖文,马穆彪,江洲,傅红.植物甾醇对其凝胶化大豆油结构稳定性和热氧化特性的影响[J].中国食品学报,2022,22(1):155-162

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  • 收稿日期:2021-01-07
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  • 在线发布日期: 2022-02-11
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