Abstract
This paper reports the experimental results of processes used for the formation of whipped oils composed of vegetable oils (salad oil) and high-melting fat crystals [fully hydrogenated rapeseed oil rich in behenic acid (FHR-B)]. No emulsifier was added to form this whipped oil. Microprobe FT-IR spectroscopy, synchrotron radiation microbeam X-ray diffraction (SR-μ-XRD), polarized optical microscopy, and differential scanning calorimetry (DSC) were employed to observe fine fat crystal particles of the most stable polymorph of β (β-fat crystal), FHR-B, and their adsorption at the air–oil surface before, during, and after the formation of the whipped oil. The results obtained revealed the following: (1) The preparation of an organogel composed of salad oil and small fibrous β-fat crystals using a special tempering procedure was a prerequisite for forming whipped oil. (2) The β-fat crystals were adsorbed at the air–oil surface to encapsulate the air bubbles during the formation process of whipped oil. (3) The values of overrun of the whipped oil reached >200 % after an aeration time of 30 min at 20 °C. (4) The SR-μ-XRD experiments demonstrated that the lamellar planes of the β-fat crystals near the air–oil surface were arranged almost parallel to the air–oil surface plane. The present study provides the first evidence that tiny fat crystal particles may cause aeration in liquid oils without the addition of other whip-assisting substances such as emulsifier crystals.
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Acknowledgments
This work is supported in part by the following two projects: the Ministry of Education, Culture, Sports, Science, and Technology (Grant-in-Aid, 20540397) and the Food Nanotechnology Project of the Ministry of Agriculture, Forestry and Fisheries of Japan. The experiments were performed with the approval of the Photon Factory Program Advisory Committee (Proposal Nos. 2008G201 and 2008G623). The authors acknowledge Mr. Y. Shinohara, University of Tokyo, for kind help with the microbeam SAXS experiment. The authors also appreciate the help of Prof. A. Iida, station manager of beam line 4A at Photon Factory, KEK Institute, Tsukuba, Japan. The authors also acknowledge Prof. Y. Furukawa, Institute of Low Temperature Science, Hokkaido University, and Dr. Y. Uda, Sumitomo Chemical Co., Ltd, for kind help with the FT-IR experiment.
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Mishima, S., Suzuki, A., Sato, K. et al. Formation and Microstructures of Whipped Oils Composed of Vegetable Oils and High-Melting Fat Crystals. J Am Oil Chem Soc 93, 1453–1466 (2016). https://doi.org/10.1007/s11746-016-2888-4
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DOI: https://doi.org/10.1007/s11746-016-2888-4