| 研究生: |
劉昌峰 Chang-Feng Liu |
|---|---|
| 論文名稱: |
探討不同培養基組成對光合菌Rhodobacter sphaeroides生產Coenzyme Q10之研究 |
| 指導教授: |
徐敬衡
Chin-Hung Shu |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程與材料工程學系 Department of Chemical & Materials Engineering |
| 畢業學年度: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 58 |
| 中文關鍵詞: | 碳氮比 、coenzyme q10 、光合菌 |
| 相關次數: | 點閱:10 下載:0 |
| 分享至: |
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因為Coenzyme Q10 (CoQ10)具有抗氧化及治療心血管疾病的效果,使得近來受到許多的注意,而光合菌Rhodobacter sphaeroide CCRC13100除了具有產氫的能力外,也具有生產CoQ10的能力。本研究以不同的碳氮比對光合菌生產CoQ10加以探討。
本研究主要分為兩部份:試管實驗及醱酵槽實驗。第一部份為試管實驗,在單一氮源部份:利用碳源(葡萄糖)和不同氮源(yeast extract、peptone、硫酸銨) 及不同的碳氮比的搭配,找出最適合菌體生長及產物生成的氮源及碳氮比。在複合氮源部份:在單一氮源存在下,添加不同濃度的硫酸銨,以提高單位菌體產物轉化率。第二部份為醱酵槽實驗,在攪拌式醱酵槽中,固定硫酸銨濃度,以葡萄糖和酵母萃取物作為主要的碳源及氮源,探討不同碳氮比對產物生成動力學的影響。
在單一氮源中,碳氮比(C:N)由27:1、5.4:1、2.7:1、1.9:1到1.4:1,以最大濃度10g/L的yeast extract(碳氮比為1.4:1),其單位菌體產物轉化率Yp/x為最高,為9.80 mg CoQ10/g biomass。在複合氮源方面,硫酸銨的添加有助於提高單位菌體產物轉化率Yp/x,而添加硫酸銨濃度愈高,單位菌體產物轉化率Yp/x也會隨之增加。其中以2.5 g/L yeast extract (碳氮比為5.4:1)添加10g/L硫酸銨的單位菌體產物轉化率Yp/x為最高,其值為7.83 mgCoQ10/g biomass。而以2.5 g/L peptone(碳氮比為3.3:1)添加10g/L硫酸銨的單位菌體產物轉化率Yp/x比不添加硫酸銨的單位菌體產物轉化率Yp/x提高2.4倍為最高。
在醱酵槽部份,高濃度硫酸銨存在時,在yeast extract 濃度為2g/L時(碳氮比為6.8:1),最有利於產物生成,其單位菌體產物轉化率Yp/x最高為22.56 mg CoQ10/ g bomass。在yeast extract 濃度為3g/L (碳氮比為4.5:1),最利於菌體生成,其最大單位基質菌體轉化率Yx/s和比生長速率分別為0.57 g biomass/ g glucose、0.134 h-1。在動力學方面,在高濃度的硫酸銨存在下,源加適當的碳氮比(6.8:1),可以得到最大的單位菌體產物轉化率。
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