私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

當(dāng)前位置:> 首頁 > 論文著作 > 正文
Synthesis and thermal gelation of hydroxypropyl chitin
作者:Chong Li, Junxia Hou, Jianjun Gu, Qiuyan Han, Ying Guan, Yongjun Zhang*
關(guān)鍵字:chitin
論文來源:期刊
具體來源:RSC Advances, 2015, 5(50), 39677-39685
發(fā)表時間:2015年

Fully water-soluble hydroxypropyl chitin (HPCh) was synthesized by the modification of chitin with propylene oxide in aqueous NaOH solution, a green and good solvent to chitin. HPChs with different degrees of substitution (DS) were obtained by varying the feeding ratio of propylene oxide to chitin. The HPCh solutions undergo a sol-to-gel transition upon heating. The transition was reversible, although an apparent hysteresis occurs in the cooling process. The gelation temperature (Tgel) decreases with increasing DS and concentration of the polymer. The thermal gelation could occur even at a concentration as low as 0.25 wt%. By adjusting the DS of the polymer, Tgel could be tuned from [similar]20 [degree]C to [similar]80 [degree]C. Meanwhile NaCl concentration and pH only slightly influence the Tgel. Preliminary tests show that the polymer is non-toxic to cells and it degrades in the presence of lysozyme. The ability to gel at temperatures below the body temperature, at relatively low polymer concentration, and biocompatibility and biodegradability of HPCh make the new thermal gelling materials quite suitable for biomedical applications.



主站蜘蛛池模板: 新乐市| 云梦县| 巨鹿县| 镇赉县| 焉耆| 启东市| 芜湖市| 石首市| 肇源县| 泗洪县| 周宁县| 稻城县| 德庆县| 从江县| 普宁市| 惠水县| 绥棱县| 萝北县| 蓬安县| 留坝县| 闽清县| 方城县| 台前县| 广东省| 古丈县| 叙永县| 通城县| 神农架林区| 库尔勒市| 香港| 平邑县| 随州市| 海城市| 二手房| 子长县| 九江县| 板桥市| 永善县| 周口市| 台东县| 曲靖市|