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  5. 真菌Phoma sp. NTOU4195活性二次代謝產物探究與抗菌天然物之策略開發
 
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真菌Phoma sp. NTOU4195活性二次代謝產物探究與抗菌天然物之策略開發

Other Title
The exploration of fungal bioactive secondary metabolites from Phoma sp. NTOU4195 and the strategic development of antimicrobial natural products
Type
thesis
Date Issued
2018-01-08
Author(s)
李明憲
Advisor
林若凱
李宗徽
Subjects
系所名稱:藥學系(碩博士班)
Description
學位別:博士
語文別:中文
指導教授:林若凱
共同指導教授:李宗徽
口試委員:李水盛;郭悅雄;李仁愛
中文關鍵字:細翼枝菜;抑制血管增生;抗發炎;抑制一氧化氮;微分液;高解析質譜儀;分子網絡分析;新型隱球菌。
英文關鍵字:Pterocladiella capillacea;anti-angiogenic;LPS;bioassay-guided;microfractionation;molecular networks;C. neoformans.
Abstract
依照傳統天然物開發之模式,在可食用之紅藻細翼枝菜(Pterocladiella capillacea)藻體內所單離之衍生真菌Phoma sp. NTOU4195的醱酵液乙酸乙酯層中,純化出7個新化合物包括:phomaketides A‒E(1-5)、pseurotin A3(6)和pseurotin G(7)以及15個已知物包括:FR-111142(8)、pseurotins A(9)、A1(10)、A2(11)、D(13)、F1(14)、14‒norpseurotin A(12)、cyclo-L-Pro-L-Val(15)、cyclo-L-Pro-L-Ile(16)、cyclo-L-Pro-L-Leu(17)、cyclo-4-hydroxy-L-Pro-L-Leu(18)、cyclo-L-Pro-L-Phe(19)、2,5-bis (methyl hydroxyl) furan(20)、tyrosol(21)、3-hydroxytyrosol(22)。其中,在新化合物1-7與其類似物進行抑制血管增生(anti-angiogenic)及抗發炎(anti-inflamamtory)之活性測試結果顯示,化合物1及化合物3分別存在最顯著之抑制血管增生表現及抑制一氧化氮產生之效果,其最小抑制濃度(IC50)分別為8.1及8.8 μM。然而,在傳統活性天然物開發過程中,往往相當耗時與投入龐大資源。因此,在研究策略上必需發展更有效率之篩選平台以解決過往天然物開發所面臨之問題,特別是避免已知物之重複分離及持續純化出無應用潛力之化合物等,並更有效率且快速地從複雜的粗萃物中精準找尋較具開發潛力之化合物,鑑於本實驗從Phoma herbarum PPM7487、Cryptosporiopsis ericae PPM7405及Albifimbria verrucaria PPM945中以HPLC-DAD 微分液(microfractionation)配合抗菌活性之引導之方式,以高解析質譜儀之斷片離子訊號(fragment ion)進行分子網絡分析(molecular networks),並搭配資料庫或13C-NMR的比對,在短時間確認20個具抗真菌活性之次級代謝產物,其中包括1個新化合物trichoverrin D(23)和19個已知物:S39163/F-I(24)、pneumacandin A0(25)、pneumacandin B0(26)、pneumacandin G(27)、TMC-151A(28)、TMC-151C(29)、roselipin 1A(30)、roselipin 1B(31)、roridin A(32)、isororidin A(33)、roridin D(34)、epiisororidin E(35)、roridin J(36)、roridin J acetate(37)、verrucarin H(38)、8∝-acetoxyroridin H(39)、verrucarin A(40)、verrucarin B(41)及verrucarin J(42)。並於本研究中初步發現,化合物29、31-35、和38-42存在未被探究之抑制新型隱球菌的活性應用。
URI
https://203.71.86.71/handle/123456789/58334

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