Aldehyde-Sodium Alginate and Amino-Gelatin Preparation as Soft Tissue Adhesive

Sodium alginate and gelatin are both remarkable natural biomaterials; they all have been extensively applied in tissue engineering and other relative fields,due to their low price and good biocompatibility. In this paper,we oxidized sodium alginate with sodium periodate to convert 1,2-hydroxyl groups into aldehyde groups to get aldehyde-sodium alginate（ A-SA）. Gelatin was modified with ethylenediamine（ ED） in the presence of water-soluble1-ethyl-3（ 3-dimethylaminopropyl） carbodiimide（ EDC） to introduce additional amino groups to get amino-gelatin. Upon mixing the A-SA and amino-gelatin aqueous solutions together,a gel rapidly formed based on the Schiff＇s base reaction between the aldehyde groups in A-SA and the amino groups in amino-gelatin.Fourier transform infrared spectroscopy（ FTIR） analysis confirmed the characteristic peak of Schiff＇s base group in the hydrogel. The gelation time measure has confirmed the gelation time is dependent on the aldehyde group content in A-SA and amino group content in amino-gelatin. The fasted hydrogel formation takes place within 30 s. The entire test suggested that this gel could be a promising candidate as soft tissue adhesive.     

阴-阳离子改性沸石处理染料废水

用十六烷基三甲基溴化铵和十二烷基硫酸钠复合改性天然沸石制备阴-阳离子改性沸石.通过X-衍射(XRD)和红外吸收光谱(IR)表征阴-阳离子改性沸石的结构,探讨阴-阳离子改性沸石对亚甲基蓝染色废水的去除效果.结果表明:当溶液pH为8、常温、振荡时间为100 min、改性沸石用量为20 g/L时,阴-阳离子改性沸石对浓度为160 mg/L的亚甲基蓝的去除率达99.32%,残余浓度远远低于国家排放标准.阴-阳离子改性沸石对亚甲基蓝的吸附规律较好地符合Langmuir吸附等温式,吸附过程符合准二级动力学方程.