In this study, a novel approach by combining base-catalyzed epoxide ring-opening and thiol-ene click chemistry is presented for the side-chain modification of dextran. The vinyl-modified dextran is prepared by a basic...In this study, a novel approach by combining base-catalyzed epoxide ring-opening and thiol-ene click chemistry is presented for the side-chain modification of dextran. The vinyl-modified dextran is prepared by a basic epoxide ring opening reaction of allyl glycidyl ether in 0.1 mol/L NaOH, followed by thiol-addition click reaction of three model sulfhydryl compounds using water-soluble Irgacure 2959 as the photoinitiator, leading to side-chain functionalized dextran modified with carboxyl, bidentate dicarboxyl or amino groups. This is the first example of combining epoxide ring-opening and thiol- ene click chemistry for side-chain modification of dextran in aqueous media. Importantly, it may also be extended as a convenient and efficient method for the side-chain modification of other polysaccharides.展开更多
Monodispersed Fe3O4-Dextran nano-particles were prepared by chemical co-deposition with average diameter of 16 nm, and a core of diameter of 5.5 nm f or Fe3O4 with a shell of thickness 5 nm for Dextran. The results of...Monodispersed Fe3O4-Dextran nano-particles were prepared by chemical co-deposition with average diameter of 16 nm, and a core of diameter of 5.5 nm f or Fe3O4 with a shell of thickness 5 nm for Dextran. The results of magnetic pro perty determination show that: they have a good magnetization of 76 emu·g-1 whi ch is increased by a factor of 49%. As compared with 51 emu·g-1 for the materia l obtained without the addition of coordination compound in the processing.展开更多
Yellow 12 molybdenum phosphoric acid-dextran solution was prepared by stirring 1g 12 molybdenum phosphoric acid powder in a 10%dextran solution at 25℃and pH=2.The solid solution was obtained by casting the yellow sol...Yellow 12 molybdenum phosphoric acid-dextran solution was prepared by stirring 1g 12 molybdenum phosphoric acid powder in a 10%dextran solution at 25℃and pH=2.The solid solution was obtained by casting the yellow solutioin on glass plate and drying thereon in dark place.The spectral properties of the yellow inclusion solution and solid solution were studied by DSC,ESR,XPS,IR,UV Vis and XRD.It was concluded that the inclusion compound of 12 molybdenum phosphoric acid with dextran was formed in form of both solution and solid solution.展开更多
目的:观察复方右旋糖苷70眼液联合贝复舒眼液治疗干眼病的临床疗效。方法:2012年9月-2013年9月收治干眼症患者36例72眼,随机分为治疗组及对照组。对照组给予复方右旋糖苷70眼液滴眼,治疗组在对照组基础上联合使用贝复舒眼液滴眼,均4次/...目的:观察复方右旋糖苷70眼液联合贝复舒眼液治疗干眼病的临床疗效。方法:2012年9月-2013年9月收治干眼症患者36例72眼,随机分为治疗组及对照组。对照组给予复方右旋糖苷70眼液滴眼,治疗组在对照组基础上联合使用贝复舒眼液滴眼,均4次/日,治疗2周后复查。比较两组治疗前后泪液分泌试验(Schirmer test,ST)、泪膜破裂时间(Breaking up time,BUT)及疗效。结果:两组治疗前后Schirmer试验结果差异无统计学意义(P>0.05),治疗前两组BUT差异无统计学意义(P>0.05),两组治疗前后BUT、疗效差异均有统计学意义(P<0.05)。结论:复方右旋糖苷70眼液联合贝复舒眼液治疗干眼症的疗效优于单纯使用复方右旋糖苷70眼液。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51373168,51390484,51233004 and 51321062)
文摘In this study, a novel approach by combining base-catalyzed epoxide ring-opening and thiol-ene click chemistry is presented for the side-chain modification of dextran. The vinyl-modified dextran is prepared by a basic epoxide ring opening reaction of allyl glycidyl ether in 0.1 mol/L NaOH, followed by thiol-addition click reaction of three model sulfhydryl compounds using water-soluble Irgacure 2959 as the photoinitiator, leading to side-chain functionalized dextran modified with carboxyl, bidentate dicarboxyl or amino groups. This is the first example of combining epoxide ring-opening and thiol- ene click chemistry for side-chain modification of dextran in aqueous media. Importantly, it may also be extended as a convenient and efficient method for the side-chain modification of other polysaccharides.
文摘Monodispersed Fe3O4-Dextran nano-particles were prepared by chemical co-deposition with average diameter of 16 nm, and a core of diameter of 5.5 nm f or Fe3O4 with a shell of thickness 5 nm for Dextran. The results of magnetic pro perty determination show that: they have a good magnetization of 76 emu·g-1 whi ch is increased by a factor of 49%. As compared with 51 emu·g-1 for the materia l obtained without the addition of coordination compound in the processing.
文摘Yellow 12 molybdenum phosphoric acid-dextran solution was prepared by stirring 1g 12 molybdenum phosphoric acid powder in a 10%dextran solution at 25℃and pH=2.The solid solution was obtained by casting the yellow solutioin on glass plate and drying thereon in dark place.The spectral properties of the yellow inclusion solution and solid solution were studied by DSC,ESR,XPS,IR,UV Vis and XRD.It was concluded that the inclusion compound of 12 molybdenum phosphoric acid with dextran was formed in form of both solution and solid solution.
文摘目的:观察复方右旋糖苷70眼液联合贝复舒眼液治疗干眼病的临床疗效。方法:2012年9月-2013年9月收治干眼症患者36例72眼,随机分为治疗组及对照组。对照组给予复方右旋糖苷70眼液滴眼,治疗组在对照组基础上联合使用贝复舒眼液滴眼,均4次/日,治疗2周后复查。比较两组治疗前后泪液分泌试验(Schirmer test,ST)、泪膜破裂时间(Breaking up time,BUT)及疗效。结果:两组治疗前后Schirmer试验结果差异无统计学意义(P>0.05),治疗前两组BUT差异无统计学意义(P>0.05),两组治疗前后BUT、疗效差异均有统计学意义(P<0.05)。结论:复方右旋糖苷70眼液联合贝复舒眼液治疗干眼症的疗效优于单纯使用复方右旋糖苷70眼液。
