Polyurethane foam dressings for dermal wounds were formulated with natural polyols in order to improve the foam characteristics and the release of 2 active agents,silver and asiaticoside(AS)as an antimicrobial agent a...Polyurethane foam dressings for dermal wounds were formulated with natural polyols in order to improve the foam characteristics and the release of 2 active agents,silver and asiaticoside(AS)as an antimicrobial agent and an herbal wound healing agent,respectively.The foam was instantly formed by interaction of polyols and diisocyanate.Hydroxypropyl methylcellulose,chitosan and sodium alginate were individually mixed with themain polyols,polypropylene glycol,in the formulation while the active componentswere impregnated into the obtained foam dressing sheets.Although the type and amount of the natural polyols slightly affected the pore size,water sorption-desorption profile and compression strength of the obtained foam sheets,a prominent effect was found in the release of both active components.Among natural polyols formulations,foam sheets with alginate showed the highest silver and AS release.Non-cytotoxicity of these foam sheets to human fibroblast cells was confirmed.Antimicrobial testing on four bacteria strains showed that 1mg/cm^2 silver in formulations with 6%of natural polyols and without natural polyols had sufficient content of the silver release with comparable inhibition zone and significantly larger zone than other formulations.In pig study,the foam dressing with 6%alginate,1mg/cm^2 silver and 5%AS could improve wound healing in both the percentage of the wound closure and histological parameters of the dermal wound without any dermatologic reactions.In conclusion,this innovative foam dressing had potential to be a good candidate for wound treatment.展开更多
应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与...应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与其它干扰元素的分离,建立了负载二苯硫脲泡塑富集、硫脲解脱-ICP-MS同时测定痕量Au和Ag的新方法。方法采用王水(1∶1)封闭消解矿样,补加水量50 m L,振荡时间和吸附温度分别为25 min和20℃,Au和Ag的方法检出限分别为0.02和0.007μg/g。使用本方法对8个国家一级标准物质中Au和Ag的检测结果与标准值基本相符,确证了方法的可行性。展开更多
基金supported by the Yeungnam University research grant in 2017。
文摘Polyurethane foam dressings for dermal wounds were formulated with natural polyols in order to improve the foam characteristics and the release of 2 active agents,silver and asiaticoside(AS)as an antimicrobial agent and an herbal wound healing agent,respectively.The foam was instantly formed by interaction of polyols and diisocyanate.Hydroxypropyl methylcellulose,chitosan and sodium alginate were individually mixed with themain polyols,polypropylene glycol,in the formulation while the active componentswere impregnated into the obtained foam dressing sheets.Although the type and amount of the natural polyols slightly affected the pore size,water sorption-desorption profile and compression strength of the obtained foam sheets,a prominent effect was found in the release of both active components.Among natural polyols formulations,foam sheets with alginate showed the highest silver and AS release.Non-cytotoxicity of these foam sheets to human fibroblast cells was confirmed.Antimicrobial testing on four bacteria strains showed that 1mg/cm^2 silver in formulations with 6%of natural polyols and without natural polyols had sufficient content of the silver release with comparable inhibition zone and significantly larger zone than other formulations.In pig study,the foam dressing with 6%alginate,1mg/cm^2 silver and 5%AS could improve wound healing in both the percentage of the wound closure and histological parameters of the dermal wound without any dermatologic reactions.In conclusion,this innovative foam dressing had potential to be a good candidate for wound treatment.
文摘应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与其它干扰元素的分离,建立了负载二苯硫脲泡塑富集、硫脲解脱-ICP-MS同时测定痕量Au和Ag的新方法。方法采用王水(1∶1)封闭消解矿样,补加水量50 m L,振荡时间和吸附温度分别为25 min和20℃,Au和Ag的方法检出限分别为0.02和0.007μg/g。使用本方法对8个国家一级标准物质中Au和Ag的检测结果与标准值基本相符,确证了方法的可行性。
