Zhongguo youzhi (Feb 2023)

蜂蜡基油凝胶中的晶型及结晶聚集体的结构层次Crystal form and structural hierarchy of the crystal aggregates in beeswax-based oleogels

  • 杨国龙，徐倩，胡培泓，刘伟，孟鹏程 YANG Guolong, XU Qian, HU Peihong, LIU Wei, MENG Pengcheng

DOI
https://doi.org/10.19902/j.cnki.zgyz.1003-7969.210372
Journal volume & issue
Vol. 48, no. 2
pp. 13 – 16

Abstract

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为解释蜂蜡基油凝胶持油性较好的原因，对蜂蜡基油凝胶中的晶型及结晶聚集体的结构层次进行研究。分别以高油酸葵花籽油和大豆油为原料油，蜂蜡为凝胶因子制备蜂蜡基高油酸葵花籽油油凝胶和蜂蜡基大豆油油凝胶，采用X-射线衍射和偏光显微分析技术分别研究了2种蜂蜡基油凝胶的晶型与微观形态。X-射线衍射分析结果表明，蜂蜡基油凝胶在2θ为21.3°和23.7°处有明显衍射峰；但在小角区域没有明显的衍射峰。偏光显微分析结果表明，在放大倍数为500倍时，可观察到单个的细小针状物或棒状物（初级颗粒）及其聚集体（簇），还有由3个或4个这样的聚集体形成的更大的聚集体群（簇群），其形状呈十字花瓣状或海胆状，据此提出了蜂蜡基油凝胶结晶聚集体的结构层次,即初级颗粒-簇-簇群-网络结构，这种网络结构使油凝胶结晶聚集体的结构紧凑、比表面积大、颗粒细小，能很好地束缚油凝胶中的液体油，使得蜂蜡基油凝胶表现出很好的持油性。 To explain the reason for better oil-holding properties of beeswax-based oleogels, the crystal form and structural hierarchy of crystal aggregates in beeswax-based oleogels were investigated. The beeswax-based high oleic sunflower seed oil and soybean oil oleogels were prepared using high oleic sunflower seed oil and soybean oil as the raw oil and beeswax as the gel factor, respectively.The crystal form and microscopic morphology of beeswax-based high oleic sunflower seed oil and soybean oil oleogels were studied by X-ray diffraction and polarized light microscopy(PLM), respectively. The results of X-ray diffraction showed that the beeswax-based oleogels presented two distinct peak at 2θ 21.3° and 23.7°， however there were no distinct peak in small angel region. The results of PLM indicated that at a magnification of 500, single fine needles or rods (primary particles) and their aggregates (clusters) could be observed, as well as larger aggregate of clusters (clusters) formed by three or four such aggregates with a crossed petal or sea urchin shape. According to the PLM, the structural hierarchy of the crystal aggregates in beeswax-based oleogels was proposed as primary particle-cluster-aggregate of clusters-network, and the network structure results in the compact structure of the crystal aggregates of the oleogels, large specific surface area and fine particles, which could well bind the liquid oil in the oleogels and make the beeswax-based oleogels exhibit good oil-holding properties.

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