油化学
Online ISSN : 1884-2003
ISSN-L : 0513-398X
44 巻, 3 号
選択された号の論文の8件中1~8を表示しています
  • 糖脂質酵素モデル (第6報)
    大勝 靖一, 久芳 武
    1995 年 44 巻 3 号 p. 179-183
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    活性部位として様々な糖残基を有する糖脂質を合成し, これを用いてセルロース及びアミロースの加水分解を行った。糖脂質は温和な条件下でβ及びα-1, 4-グリコシド結合を加水分解し, 糖残基のヒドロキシル基の立体配置によって加水分解の程度に著しい差が見られた。特にチアゾリジン環を有するものはそれを持たないものに比べ分解活性が高かった。また, C-2位とC-3 位のヒドロキシル基の立体配置が基質の見分けに大きく関与していることが分かった。
  • 関口 有信, 荻野 圭三, 山内 仁史, 阿部 正彦
    1995 年 44 巻 3 号 p. 184-191
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    Molecular Interactions between Phospholipids and Sphingoglycolipids in a Lipid Bilayer were investigated by measurements of the micropolarity, microviscosity, microfluidity, and surface charge density of the liposomes.
    Liposome formation was dependent on the concentrations of sphingoglycolipids and/or their sugar chains. Liposomal bilayer membranes were stabilized by the addition of suitable amounts of sphingoglycolipids. The absolute value of surface charge density of liposomes decreased with an increase in the concentration of sphingoglycolipids. The stability of liposomes modified by sphingoglycolipids was depended both on the ceramide and sugar chain involved.
  • 無類井 建夫, 亀井 ゆみ子
    1995 年 44 巻 3 号 p. 192-196
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    Two minor isoprenoid alcohols in the vegetable oils, geranylgeraniol and dihydrophytol, were determined by HPLC with fluorescence labeling. Geranylgeraniol was found to be widely distributed in these oils in this study as well as phytol but dihydrophytol was present only in cotton seed and kapock oil. Geranylgeraniol and phytol were largely reduced at bleaching step of oil refining. The amount of dihydrophytol in cotton seed oil did not change with bleaching or dewaxing. Dihydrophytol was charachteristic of cotton seed oil and change in its amount was negligible during the oil refining consequently, dihydrophytol could be used for detecting cotton seed oil or cotton seed oil strearin in mixed edible oil.
  • 藤田 孝, 松田 恒, 佐藤 孝義, 岩崎 泰介, 高藤 愼一
    1995 年 44 巻 3 号 p. 197-202
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    The phospholipid content of Euglena cells and changes in lipid components during the preservation of harvested cells were investigated. Analysis of phospholipid content of cells cultured under heterotrophic conditions in the dark indicated phosphatidylinositol as well as phosphatidylcholine to be the major components of pospholipid, phosphatidylserine to be absent.
    When cells were aseptically preserved at 25°C for 7 d, the phospholipid fraction decreased and free fatty acid fraction increased, possibly due to phospholipase reactions. Phospholipase activity was thus determined using phosphatidylcholine, which markedly decreased during the course of preservation, as the substrate. It was thus possible to detect phospholipase A, C, and D activity.
  • 木田 吉重, 岡村 国継, 前川 博史, 西口 郁三
    1995 年 44 巻 3 号 p. 203-206
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    イサコン酸水素メチルおよびラウリン酸を水酸化カリウムを含むメタノール中での無隔膜セルを用いる交差コルベ型カップリング反応をかぎ (鍵) 反応として行い, 更に生成したトリアコンタン酸メチルを水素化アルミニウムリチウムにより還元する事により天然の植物成長促進剤である1-トリアコンタノールの効率的な新規合成法を開発した。
  • 高木 和行, 平井 誠道, 藤沼 幸雄, 藤松 仁, 宇佐美 久尚, 小笠原 真次, 笠原 由子, 結城 明文
    1995 年 44 巻 3 号 p. 207-210
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    The surface tension of aqueous dilute solutions of sucrose monopalmitate was measured as a function of surfactant concentration at various temperatures under atmospheric pressure. Specific behavior was observed that not indicate the surface activity by a certain concentration below cmc.
    Such specific behavior was also demonstrated by change in surface tension with time. At the concentrations lower than cmc, the surface tension was initially relatively low, gladually increased, and finally became essentially the same as that of pure water with time.
    At the concentrations higher than cmc, the surface tension decreased with time and finally become a constant value. The existence of the concentration region which is not indicate surface activity is assumed that the sucrose fatty ester is not absorpt the vapor-liquid surface because of dominant incorporation of the sucrose into water structure.
  • 無類井 建夫, 辻 宏明, 新井 有里
    1995 年 44 巻 3 号 p. 211-214
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    Specific acylation of sterylglycosides with enzyme was carried out for 20 commercially available lipases. Lipase OF from Candida sylindracea indicated the highest acylation in chloroform and phosphate buffer (pH 7.0). In chloroform, lipase OF introduced saturated and unsaturated fatty acids with 8 to 18 carbons introduced into the hydroxyl group at the 6-position of sugar moiety. But the acylation of fatty acids branched at carbon adjacent to the carboxyl group proceeded with considerable difficulty. In phosphate buffer, unsaturated fatty acids were introduced to a greater extent than in chloroform, but still the acylation of saturated fatty acids proceeded to a lesser degree owing to low solubility in phosphate buffer. Reaction time longer than 96 h casused the formation of di-acylated sterylglycosides. A standard substance for determining acylated sterylglycosides could be prepared by the present method
  • 山本 二郎, 片山 昌弘, 高原 元秀, 吉田 裕司
    1995 年 44 巻 3 号 p. 215-218
    発行日: 1995/03/20
    公開日: 2009/10/16
    ジャーナル フリー
    Reactions of symmetrically dimethylsubstituted benzopinacols and 1, 2-dipheny1-1, 2-bis (ρ-chloro-phenyl) -1, 2-ethanediol (5) with the DMSO-SbC15 (1 : 1) complex (Sb complex), afforded two Pinacol rearrengment products, ([A] and [B]), were obtained in the case of except for the reaction of 1, 2-diphenyl-1, 2-di-m-toly1-1, 2-ethanediol (3) in nitroethane.
    X-C6H4-C-H5C6-HO-C-C6H5-OH-C6H4-X→X-C6H4-C-C6H5-C6H5-C=O-C6H4-X+C6H5-C-X-C6H4-X-C6H4-C=O-C6H4 [A] [B]
    X : o-Me (2), m-Me (3), p-Me (4), p-Cl (5)
    Higher product ratios ([B] / [A]) were achieved in the Pinacol rearrangement of (3) and 1, 2-dipheny1-1, 2-di-p-toly1-1, 2-ethanediol (4) with the Sb complex in nitroethane, compared to ([B] / [A]) using benzene as the solvent. ([B] / [A]), values were lower in the reaction of 1, 2-diphenyl-1, 2-di-o-tolyl-1, 2-ethanediol (2) and (5) with the Sb complex in nitroethane. ([B] / [A]) in the Pinacol rearrangement of these benzopinacols in nitroethane were essentially the same as those for the Pinacol rearrrangement using iodine-acetic acid.
    The Pinacol rearrangement of benzopinacols with the Sb complex appeared to proceed via an intramolecular pathway.
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