2007 Fiscal Year Final Research Report Summary
Ultrasound and shear stress effects of lipid crystallization in nano-sized particles
| Project/Area Number |
18540406
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | Hiroshima University |
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Principal Investigator |
UENO Satoru Hiroshima University, Graduate school of biosphere sciences, Associate professor (50243605)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Kiyotaka Hiroshima University, Graduate school of biosphere sciences, Professor (80034479)
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| Project Period (FY) |
2006 – 2007
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| Keywords | nano-sized particle / emulsion / crystallization / synchrotron radiation X-ray diffraction measuremen / surface template effect / ultrasound / polymorphism / shear stress |
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| Research Abstract |
Microbeam X-ray diffraction study of crystallization in one particle has been done. Trilaurin was used as oil phase of oil-in-water (O/W) emulsion. The fallowing particle sizes was prepared; 100 nm; 500 nm, 1 micro-meter, 30 micrometer and 50 micrometer The ultrasound irradiation was added in the condition of 100 W, 20 kHz. The irradiation time was 2 sec. The following results were observed;
(i) Ultrasound (US) irradiation: Crystallization of the sample with US was faster than that without US at room temperature.
(ii) The size effect of the rate of crystallization: As for micro-meter sized particles, 1, 30 and 50 micrometer, crystallization is promoted by US, while no remarkable effect was observed with nano-meter sized particles, such as 100 and 500 mar-meter diameter
(iii) US irradiation effect for the appearance of polymorphic crystallization: Crystallization promoted by US was always stable polymorph, beta form. This result is quite good agreement with that of bulk fat
(iv) Fat crystal
… More
lization mechanism: Crystal growth from center to edge was observed in spherulite. We think that poly/mid with random orientations tamed at the center of spherulite. Than, crystal growth proceeded along the direction of fatty add chain packing. As a result of geometrical selection among thin layer crystals, lamellar planes were directed along the radial direction from the center position to outer position. These crystal growth have been seen in the spherulites of palm oil and 1,3-dipalmitoyl-2-oleoyl-sn-glycerol, POP. Because the same morphology was observed between different fat molecules, this mechanism wane generality accepted in the spherulite of fat.
(v) As for the shear effect for the crystallization of oil droplets, no experiment has been done because we cannot purchase the shear stress machine. It is too small money to buy the machine. However, new we are trying to produce the machine and it will be completed in this autumn. We will try measure the shear stress effect for crystallization in oil droplet Less
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[Journal Article] Physical Properties of Two Isomers of Conjugated Linoleic Acid2008
Author(s)
H., Uehara, T., Suganuma, S., Negishi, Y., Uda, Y., Furukawa, S., Ueno, K., Sato
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Journal Title
J. Am. Oil. Chem. Soc 85
Pages: 29-36
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Observation crystallization in margarine2007
Author(s)
S., Ueno, M., Tanaka, R., Tanaka, M., Murakami, K., Sato
Organizer
2007 Annual meeting of Japan Society for Bioscience, Biotechnology, and Agrochemistry
Place of Presentation
Tkyo, Agricultural University
Year and Date
20070324-27
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Variation of morphology and whipping2007
Author(s)
A., Suzuki, S., Ueno, K., Sato
Organizer
2007 Annual meeting of Japan Society for Bioscience, Biotechnology, and Agrochemistry
Place of Presentation
Tokyo, Agricultural University
Year and Date
20070324-27
Description
「研究成果報告書概要(欧文)」より
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