首页> 外文期刊>Journal of Applied Polymer Science >Preparation and Characterization of Scleroglucan Drug Delivery Films: The Effect of Freeze-Thaw Cycling
【24h】

Preparation and Characterization of Scleroglucan Drug Delivery Films: The Effect of Freeze-Thaw Cycling

机译:硬葡聚糖递药膜的制备和表征:冻融循环的影响

获取原文
获取原文并翻译 | 示例
       

摘要

This study examined the effect of the freeze-thaw process on the physical properties of films prepared from scleroglucan (Scl) hydrogels, suitable for drug delivery applications. Films made from Scl, using glycerol as plasticizer, were prepared from hydrogels by two procedures: a room temperature drying (RTD) method and a freeze-thaw cyclic process, before the application of RTD, which results in a reinforced physically cross-linked network. Films were characterized by studies of water vapor transmission (WVT), swelling, tensile tests, ESEM microscopy, FTIR, and drug release measurements. These determinations showed significant differences between films obtained by both treatments. The films prepared through freeze-thaw cycles showed an important increase of the tensile strength with respect to those corresponding to films only air dried and a decreasing swelling degree in direct relationship to the number of freeze-thaw cycles. A model drug, Theophylline, was included in these biocompatible films for in vitro drug release measurements, using a flat Franz cell. The physical differences observed between Scl films prepared with both methods can be explained proposing that the number of crosslinking points by hydrogen bonding increase when increasing the number of freezing and thawing cycles used for film preparation.
机译:这项研究检查了冻融过程对由硬葡聚糖(Scl)水凝胶制备的薄膜的物理性能的影响,适用于药物递送应用。使用甘油作为增塑剂,由Scl制成的薄膜是通过以下两个步骤由水凝胶制备的:室温干燥(RTD)方法和冻融循环过程,在使用RTD之前,这会形成增强的物理交联网络。通过研究水蒸气透过率(WVT),溶胀,拉伸试验,ESEM显微镜,FTIR和药物释放测量来表征薄膜。这些测定表明两种处理获得的膜之间存在显着差异。相对于仅风干的薄膜,通过冻融循环制得的薄膜显示出显着的拉伸强度显着提高,而与冻融循环数直接相关的溶胀度降低。这些生物相容性薄膜中包括模型药物茶碱,用于使用扁平Franz细胞进行体外药物释放测量。可以解释通过两种方法制备的Scl薄膜之间观察到的物理差异,并提出当增加用于薄膜制备的冷冻和解冻循环次数时,通过氢键键合的交联点数会增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号