Efficient Preparation of Liposomes Encapsulating Food Materials Using Lecithins by a Mechanochemical Method
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概要
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In order to evaluate to the feasibility of using lecithins for nanocapsules including functional food materials, liposomes were prepared from different commercially available lecithins (SLP-WHITE, SLP-PC70 and PL30S) by the Bangham method, and their physicochemical properties were examined by using a confocal laser scanning microscopy (CLSM) and the measurements of trapping efficiency. There was little difference in the trapping efficiency among the three types of liposomes. In all cases, the trapping efficiency clearly increased with an increase of the lecithin concentration up to 10 wt % , and the maximum efficiency reached at approximately 15%. CLSM observation showed the particle size of liposomes prepared from SLP-WHITE is significantly smaller than that prepared from other lecithins. In addition, liposomal solution prepared from SLP-WHITE remained well dispersed for at least 30 days, while two other liposomal solutions showed a phase separation due to aggregation and/or fusion of liposomes. These results indicated that SLP-WHITE is the most appropriate for the preparation of stable liposomes with well dispersed among the lecithins tested. SLP-WHITE liposomes were then prepared by the mechanochemical method using a homogenizer and microfluidizer, aiming at improving the preparation efficiency and liposome stability. The particle size of the prepared SLP-WHITE liposomes decreased with increasing inlet pressure and the number of processed cycles, and reached between 73 and 123 nm based on the measurement using dynamic light scattering. Moreover, freeze-fracture transmission electron microscopy revealed that the prepared liposomes are small unilamellar vesicles (SUV) with a diameter of approximately 100 nm. The extract of Curcuma longa Linn. (Ukon), which contains curcumins as a functional food material, was then subjected to the mechanochemical method with SLP-WHITE to give liposomes including the functional materials. Interestingly, the trapping efficiency of the liposomes for curcumins was found to reach over 85%. From these results, the present mechanochemical method is very likely to allow us to efficiently prepare stable and functional liposomes from the low-cost lecithin. The method may thus have a potential for manufacturing practical nanocapsules, which serves as a novel carrier of functional food materials.
著者
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Oku Hirosuke
Center Of Molecular Biosciences Tropical Biosphere Res. Center Univ. Of The Ryukyus
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Kitamoto Dai
National Institute Of Advanced Industrial Science And Technology
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Kitamoto Dai
National Chemical Laboratory For Industry
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Imura Tomohiro
National Institute Of Advanced Industrial Science And Technology
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Wada Koji
Faculty Of Agriculture
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Morita Tomotake
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Science An
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Takahashi Makoto
The United Graduate School of Agricultural Science, Kagoshima University
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Inafuku Kei-ichiro
Kanehide Bio Co., Ltd.
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Miyagi Takeshi
Kanehide Bio Co., Ltd.
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Oku Hirosuke
Center of Molecular Bioscience, University of the Ryukyus
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