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國立高雄科技大學 海洋生物技術系 許德賢所指導 林育嘉的 大腸桿菌中溶菌酶基因的表現對PHA產率與純化效率的影響 (2020),提出triton x-100蛋白質關鍵因素是什麼,來自於溶菌酶、聚羥基烷酸酯、PHA萃取、PHA含量。

而第二篇論文明志科技大學 化學工程系生化工程碩士班 劉昭麟所指導 陳英修的 以膠體覆蓋法偵測幾丁質酶之活性 (2020),提出因為有 的重點而找出了 triton x-100蛋白質的解答。

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大腸桿菌中溶菌酶基因的表現對PHA產率與純化效率的影響

為了解決triton x-100蛋白質的問題,作者林育嘉 這樣論述:

現今環保議題受到重視,聚羥基鏈烷酸酯 (PHA) 作為可替代塑料的材料之一,其具有良好的生物相容性及生物可降解性,但受限於高的生產成本阻礙了PHA的商品化。PHA從細菌細胞中的萃取過程佔了總成本的30%至50%,是降低PHA生產成本進入商業化的關鍵之一。本研究將溶菌酶基因與Cupriavidus sp. L7L或Ralstonia eutropha H16之pha合成基因組於大腸桿菌中共同表現。在PHA累積條件下,溶菌酶基因的表現不會抑制細菌生長。累積結果顯示以葡萄糖酸 (gluconic acid) 為碳源,並在有溶菌酶表現時,其生物生質量可提高約1 dry wt g/L及約20 dry

wt % PHA含量。溶菌酶基因與pha合成基因組共同表現可有效提升PHA的萃取效率,萃取過程不使用氯仿及二氯甲烷等有機溶劑。本研究建立的最佳純化方式包含添加EDTA及界面活性劑處理、20%甲醇清洗菌體、蛋白水解酶 (Alcalase) 消化蛋白質、最終以50%甲醇清洗後,其結果顯示萃取後可獲得高純度 (95 dry wt %) 的PHA顆粒。進一步以1% SDS清洗PHA顆粒後其純度可達99 dry wt %。最終以SDS-PAGE與CBR染色分析PHA顆粒表面蛋白,幾乎偵測不到蛋白質的存在。本研究建立PHA最佳化純化方式在未來有望運用於工業化使用。

以膠體覆蓋法偵測幾丁質酶之活性

為了解決triton x-100蛋白質的問題,作者陳英修 這樣論述:

In this dissertation, two methods of quantifying chitinase activity were used. The commercial Streptomyces griseus chitinase and N- acetyl glucosaminidase were detected by the cover assay with glycol chitin and p-nitrophenyl-N-acetyl-β-D- glucosaminide, respectively. After electrophoresis, the SDS-

PAGE which contains the commercial S. griseus chitinase was renatured in wash buffer 2.5% and 1% purified triton X-100. An overlay glycol chitin gel was then incubated in contact with separation gel overnight at 37 oC. Lytic zone was revealed after stained and destained with CBB-R250. Two bands wer

e observed with lysozyme as positive control and five bands with the commercial S. griseus chitinase. The estimated molecular weight of lysozyme and S. griseus chitinase were 14.2 kDa and 40 kDa, respectively.For the quantitative assay of exochitinase (N-acetyl glucosaminidase) in solution, a rapid

method using pNP -NAG as substrate was conducted to determine enzyme activity by cover assay. Base on the same system with glycol chitin as substrate method, the SDS-PAGE which contains the exochitinase was renatured in wash buffer 2.5% and 1% purified triton X-100. An overlay pNP- NAG gel and subst

rate solution were then incubated in contact with separation gel at 37 oC. After the overnight reaction, visualization of the overlay gel and filter paper containing pNP-NAG solution revealed the yellow color of pNP.Keywords: chitinase; S. griseus chitinase; exochitinase; cover assay; glycol chitin

; pNP-NAG.