研究生: |
吳仲倫 Chung-Lun Wu |
---|---|
論文名稱: |
以乳化法製備植物固醇粒子之結晶行為研究 Studies on The Crystallization Behavior and Characteristics of Phytosterol Nanoparticles Prepared by Emulsion Method |
指導教授: |
周更生
Kan-Sen Chou |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 62 |
中文關鍵詞: | 植物固醇 |
外文關鍵詞: | phytosterol |
相關次數: | 點閱:1 下載:0 |
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點在以乳化法製備植物固醇奈米粒子的方法時,在不同含量的界面活性劑Tween80與Tween60使用下,分別在揮發法及萃取法中對固醇粒子粒徑的影響。結果發現在揮發法中,固醇粒徑大致隨界面活性劑的用量增加而減少,且Tween80的使用下所形成的粒子粒徑較Tween60來的小。在Tween80的情況下,最小粒徑可達40.4nm,而Tween60最小則只能達119.55nm。但以萃取法製備時,固醇粒徑並不隨界面活性劑的用量而有所改變,Tween80的使用下粒徑大約在60nm左右,而Tween60則約在150nm。
此外,製備過程中除了奈米粒子外,還有寬約500nm、長約10μm的針狀結晶產生。實驗結果發現針狀結晶的量會隨著界面活性劑用量的增加而減少,換言之,界面活性劑的用量除了會影響粒徑的大小外,對於針狀結晶的產生也具有抑制的效果,而Tween60相較於Tween80有更好的抑制效果。在Tween60用量達5克時,則可避免約99﹪的固醇形成針狀結晶,但Tween80則需要用到6克才能
達到約96﹪。
在以揮發法製備奈米粒子時,若添加額外的界面活性劑(CMC),當Tween80用量為1克時有減小粒徑的功用。若超過1克以上,則會造成粒徑的變大,以及粒徑分佈變廣的情形發生。
In this work, we tried to study how surfactant affect the size of nanoparticles of phytosterol prepared by emulsion method. When using
emulsion-evaporation method, the particle size was found to decreas as the surfactant concentration increased. And smaller particles were obtained when using Tween80 than Tween60. The smallest particle was 40.4nm when using Tween80 , but on the other hand,the smallest size was 119.55nm for Tween60.When using emulsion-extraction method,the particle was almost the same regardless of the surfactant concentration.Here,the nanoparticle size was about 60nm and 150nm for Tween80 and Tween60 respectively.
In addition to nanoparticles,needle-shaped crystals were also obtained the by emulsion method.These crystals were about 500nm in width, and was about 10μm in length.The quautity of neddle-shaped crystals decreased when the surfactant concentration increased.Moreover, Tween60
had better effect on decreasing the quantity of neddle-shaped crystals than Tween80.
When an additional surfactant of carboxy methyl cellulose(CMC)was included, the size of nanoparticle decreased at the Tween80 concentration of 1﹪(w/w). When the concentration of Tween80 was over 1﹪(w/w), the
nanoparticle`s size increased and showed wider distribution as well.
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