Journal of Oleo Science
Online ISSN : 1347-3352
Print ISSN : 1345-8957
ISSN-L : 1345-8957
Volume 54 , Issue 11
Showing 1-7 articles out of 7 articles from the selected issue
Oils & Fats
  • Yukihisa TANAKA, Ikuko SAKAKI
    2005 Volume 54 Issue 11 Pages 569-576
    Published: 2005
    Released: October 15, 2005
    JOURNALS FREE ACCESS
    The authors focus on tuna shavings as a natural resource which hither to has been unused, they contain a high concentration of phospholipids including docosahexaenoic acid (DHA-PL) and are a by-product of factory processed tuna. Supercritical carbon dioxide (SC-CO2) although a suitable substance in the extraction of non-polar substances (triacylglycerides), has not proven effective in the extraction of polar substances. The efficient use of SC-CO2/ethanol to extract and fractionate phospholipids from tuna shavings was therefore investigated. Extraction was performed at low pressure and temperature (17.7 MPa and 33°C) to avoid oxidation of polyunsaturated fatty acids. Phospholipids were extracted and fractionated with more than 5%-ethanol in SC-CO2. To reduce the amount of consumed ethanol is an important problem to overcome in extracting on an industrial scale. The tuna shavings were soaked in the same volume of ethanol before extraction with neat SC-CO2. For performance on an industrial scale, the extracting conditions were evaluated using a 10 mL-laboratory scale reactor. 182.8 kg of soaked tuna shavings was finally extracted and 4.2 kg of DHA-PL (DHA content = 29%) was obtained in a series of industrial processes.
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Detergents & Interface Science
Biochemistry & Biotechnology
  • Mitsuo MIYAZAWA, Nobuo YAGI, Katsuya TAGUCHI
    2005 Volume 54 Issue 11 Pages 589-594
    Published: 2005
    Released: October 15, 2005
    JOURNALS FREE ACCESS
    Methanol extract from Arctium lappa L. showed an inhibitory activity of α-glucosidase. The methanol extract was re-extracted with ethyl acetate and water. The ethyl acetate extract showed inhibitory activity. The inhibitory compound was isolated from the ethyl acetate extract and identified as sitosterol-β -D-glucopyranoside (1) by EI-MS, FAB-MS, IR, 1H and 13C NMR spectroscopy. Compound 1 inhibited 97.3% of α-glucosidase activity at a concentration of 200.0 μ mol/mL, and the ID50 (50% inhibition dose) value was 30 μ mol/mL. In addition, the inhibitory compounds from the ethyl acetate extract were also identified as methyl palmitate (2), methyl linoleate (3) and methyl linoleneate (4) by GC-MS analysis. Compound 2-4 inhibited 73.4%, 66.5% and 68.5% of α-glucosidase activity at a concentration of 200 μ mol/mL, and the ID50 values were 52.8, 47.5 and 46.7 μ mol/mL. To research the structure-activity relationship, methyl steareate (5), methyl oleate (6), palmitic acid (7), linoleic acid (8), linolenic acid (9), stearic acid (10) and oleic acid (11) were also assayed.
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  • Seiichi TOBE, Toshiyuki WATANABE, Itsuo HAMA, Masanori IWAMA, Masachik ...
    2005 Volume 54 Issue 11 Pages 595-600
    Published: 2005
    Released: October 15, 2005
    JOURNALS FREE ACCESS
    We investigated the bacteriolytic activity of alkaline protease BYA, a detergent protease, from Bacillus sp. Y. Protease BYA effectively lysed gram-negative bacteria and some gram-positive bacteria like Staphylococcus aureus and Staphylococcus epidermidis. The optimum pH of protease BYA was 8-9, and it was most active at 60°C, a temperature at which Deozyme, a commercial bacteriolytic enzyme, had lost most of its activity. The bacteriolytic activity and protease activities of protease BYA would be useful for removing bacteria from worn garments and production facilities.
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Chemistry & Organic Synthesis
  • Hiroharu SHIBAYAMA, Koichi UEDA, Kimio YOSHIO, Sanae MATSUDA, Masayosh ...
    2005 Volume 54 Issue 11 Pages 601-608
    Published: 2005
    Released: October 15, 2005
    JOURNALS FREE ACCESS
    A novel alkyl ester of Vitamin C derivative, originated in a stable ascorbate derivative, sodium L-ascorbic acid 2-phosphate (VCP-Na), was chemically synthesized. The thermal stability, surface tension, distribution between organic and water phase, and in vitro skin permeability were evaluated. This monoalkyl ester derivative was identified as sodium isostearyl 2-O-L-ascorbyl phosphate (VCP-IS-Na) by UV spectra, infrared spectra, mass spectra, and nuclear magnetic resonance spectroscopy. The reaction afforded VCP-IS-Na in a high yield (60%). VCP-IS-Na exhibited satisfactory stability in neutral solution comparable to that of a typical stable derivative, VCP-Na. Increased skin permeability was superior to those of VCP-Na and ascorbic acid (VC). VCP-IS-Na that is susceptible to the enzymatic hydrolysis by tissue esterase and/or phosphatase released VC in the skin tissues. Thus, these characteristics indicate that the novel Vitamin C derivative presented here, VCP-IS-Na, may be effective pro-Vitamin C for skin care application.
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  • Hirotoshi UTSUNOMIYA, Jyunichi KAWATA, Wato CHANOKI, Nozomu SHIRAKAWA, ...
    2005 Volume 54 Issue 11 Pages 609-612
    Published: 2005
    Released: October 15, 2005
    JOURNALS FREE ACCESS
    The compositions of the essential oil from woods of Prunus mume Sieb. et Zucc. (ume), have been investigated by capillary GC and GC/MS. The oil was found to contain 97 components, representing 92.41% of the total oil. The main constituents were 6,10,14-trimethyl-2-pentadecanone (15.83%), α-acorenol (9.36%), (Z)-α-bisabolene (7.49%), benzaldehyde (3.87%), isopropyltiglate (3.84%), terpinen-4-ol (3.41%).
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