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Synthesis of Sulfated Cyclodextrin Amphiphiles with Liposomal Encapsulation Properties

Journal of Encapsulation and Adsorption Sciences 2015年第3期5卷 144-154页

作者： Tetsuya Furuike koichi nasu Hiroshi Tamura Faculty of Chemistry Materials and Engineering Kansai University Suita Japan

A novel class of amphiphiles with sulfate groups at the C-6 position and palmitoyl groups at the C-2, 3 positions of α-, β-, and γ-cyclodextrin (CD) were efficiently synthesized. These compounds formed stable monolayers with high collapse pressures at the air-water interface. The mixed monolayer behaviors of the 6-O-sulfated CD amphiphiles (SO3-CDC16) in the presence of dipalmitoyl phosphatidylcholine (DPPC) and cholesterol were discussed using the surface pressure-molecular area (π-A) isotherms. The collapse pressures showed maxima at molar ratios of SO3-CDC16 lower than 10 mol%. A morphological analysis of the liposomes containing DPPC and 4 mol% SO3-CDC16 formed in PBS was carried out using transmission electron microscopy with negative staining, and vesicles with maximum diameters of 350-500 nm were observed. Moreover, the releasing ability of these liposomes was examined using a fluorescent compound, calcein. It was clearly shown that liposomes containing SO3-CDC16 could release encapsulated calcein more easily than liposomes consisting only of DPPC, and that the release rate depended on the phase transition temperature of the SO3-CDC16 included in the liposome membrane.

关键词： Cyclodextrin Amphiphile Liposome Encapsulation

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Literature review of the energy sources for performing laparoscopic colorectal surgery

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World Journal of Gastrointestinal Surgery 2012年第1期4卷 1-8页

作者： Tsukasa Hotta Katsunari Takifuji Shozo Yokoyama Kenji Matsuda Takashi Higashiguchi Toshiji Tominaga Yoshimasa Oku Takashi Watanabe Toru nasu Tadamichi Hashimoto koichi Tamura Junji Ieda Naoyuki Yamamoto Hiromitsu Iwamoto Hiroki Yamaue Second Department of Surgery Wakayama Medical UniversitySchool of Medicine

Laparoscopic surgery for colorectal disease has become widespread as a minimally invasive *** is important because the increasing availability of new devices allows us to perform procedures with a reduced length of surgery and decreased blood *** herein report the results of a literature review of energy sources for laparoscopic colorectal surgery,focused especially on 6 studies comparing ultrasonic coagulating shears(UCS) and other *** also describe our laparoscopic dissection techniques using UCS for colorectal *** short-term outcomes of surgeries using UCS and Ligasure for laparoscopiccolorectal surgery were superior to conventional *** authors have reported that the length of surgery or blood loss when Ligasure was used for laparoscopic colorectal surgery is less than when UCS was *** the other hand,a recent study demonstrated that there were no significant differences between the short-term outcomes of UCS and Ligasure for laparoscopic colorectal *** is therefore suggested that the choice of technique used should be made according to the surgeon’s *** also describe our laparoscopic dissection techniques using UCS(Harmonic ACE) for colorectal cancer with regard to the retroperitoneum dissection,dissection technique,dissection technique around the feeding artery,and various other dissection *** therefore review the outcomes of using various energy sources for laparoscopic colorectal surgery and describe our laparoscopic dissection techniques with UCS(Harmonic ACE) for colorectal cancer.

关键词： Laparoscopic surgery Ultrasonic coagulating shears Harmonic Scalpel Ligasure Colon and rectum Dissection technique

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