AMPHIPATHIC COMPOUND HAVING NOVEL PENTA-SACCHARIDE HYDROPHILIC GROUP AND USE THEREOF
申请人:Industry-University Cooperation Foundation Hanyang University Erica Campus
公开号:US20190169218A1
公开(公告)日:2019-06-06
Disclosed are an amphipathic compound having a penta-saccharide hydrophilic group, a method of preparing the same, and a method of extracting, solubilizing, stabilizing, crystallizing or analyzing membrane proteins and membrane protein complexes using the same. In particular, since the compound has a high-density penta-saccharide hydrophilic group composed of five glucose units, the compound may have an excellent effect on crystallization of membrane proteins. In addition, since the hydrophilic group used in the amphipathic compound has a novel structure, the hydrophilic group may be applied to the development of various amphipathic molecules.
Axial-Bundle Phases − New Modes of 2D, 3D, and Helical Columnar Self-Assembly in Liquid Crystalline Phases of Bolaamphiphiles with Swallow Tail Lateral Chains
rhombohedral R ̄3m symmetry. The bundles are embedded in the matrix of the lateral chains, which is divided into fluoroalkyl- and aliphatic-rich regions. In the 2D columnar phase the fluorinated regions take the form of either straight columns running along the edges of the hexagonal Voronoi cells or, for compounds with a higher degree of fluorination, fuse to a hexagonalhoneycomb enclosing the aromatic
两个系列的多亲分子,由刚性和线性对三联苯核组成,两端带有能够形成氢键的极性甘油基团,以及两条支链燕尾型侧链,由一个氟化和一个非氟化支链或两个氟化支链组成通过差示扫描量热法、偏光显微镜和 X 射线衍射 (XRD) 合成并研究了分支,并研究了它们在热致液晶 (LC) 相中的自组装。至少在最高温度下,所有分子都形成六方柱状相。在这些相中,柱子由芳香棒核和脂肪壳组成。芳香棒形成旋转平均并平行于柱长轴的束。这种独特的组织已通过不同的光学和 XRD 方法得到证实。棒束内的芳香族和甘油基团被隔离成交替的片段。根据温度和分子结构,这种周期性的长程柱间相关性可能发生,导致具有菱面体 R ̄3m 对称性的 3D 有序 LC 相。这些束嵌入侧链的基质中,该基质分为富含氟烷基和脂肪族的区域。在 2D 柱状相中,氟化区域采用沿六边形 Voronoi 单元边缘延伸的直柱形式,或者对于具有较高氟化度的化合物,融合为包围芳香核的六边形蜂窝。
Enantiospecific synthesis of the heparanase inhibitor (+)-trachyspic acid and stereoisomers from a common precursor
作者:Steven C. Zammit、Vito Ferro、Edward Hammond、Mark A. Rizzacasa
DOI:10.1039/b708594j
日期:——
The total synthesis of natural (+)-trachyspic acid and its enantiomer is described starting from a common 2-deoxy-d-ribose derivative. The synthesis of the corresponding C3 epimers from the same starting material is also described. Each stereoisomer was assayed for heparanase inhibition.
ALIPHATIC POLYESTER COPOLYMER AND PROCESS FOR PRODUCING THE SAME, BIODEGRADABLE RESIN MOLDING BASED ON ALIPHATIC POLYESTER, AND LACTONE-CONTAINING RESIN
申请人:DAICEL CHEMICAL INDUSTRIES, Ltd.
公开号:EP1354908A1
公开(公告)日:2003-10-22
A high molecular weight aliphatic polyester copolymer, a high molecular weight aliphatic polyester copolymer containing polylactic acid; process for industrially producing these copolymers; composition of these copolymers; and various uses thereof. These copolymers have practical properties which make the copolymers moldable. They are free from the problem of plasticizer bleeding and can be degraded by microorganisms present in soils or water. They give moldings, such as sheets and films, which combine a sufficient strength with tear resistance. When the copolymers are ones having a branched structure, they give a molding having excellent mechanical properties. The moldings obtained from compositions containing either of these copolymers are excellent in elongation and biodegradability and have a satisfactory balanc therebetween. In particular, blending with one or more other biodegradable resins gives a molding having better moldability.
The invention aims at providing a polylactic acid composition having specific thermal characteristics and gas barrier properties and at obtaining a polylactic acid composition comprising PLLA and PDLA which composition can form moldings (such as stretched film) excellent in surface smoothness, transparency, heat resistance, and toughness. Specifically, a polylactic acid composition characterized by exhibiting a peak of 30 mJ/mg or above in DSC as determined by cooling at a rate of 10 °C/min after the lapse of 10 min at 250 °C, preferably a polylactic acid composition characterized by exhibiting a peak (1)/peak (2) ratio of 0.5 or below wherein the peak (1) and peak (2) correspond to a peak of Tm of 150 to 180 °C and a peak of Tm of 200 to 240°C respectively in DSC as observed in the second heating (namely, re-heating from 0 °C at a rate of 10 °C/min which follows the cooling at a rate of 10 °C /min conducted after the lapse of 10 min at 250 °C).