查詢結果分析
來源資料
相關文獻
- Vitamin E and Its Metabolic Pathways in Mammals and Birds
- 微生物來源天然抗氧化劑之篩選研究
- Comparison of Plasma Antioxidant Levels and Related Metabolic Parameters between Smokers and Non-Smokers
- Effects of Alendronate on Bone Turnover Markers in Early Postmenopausal Women
- Metabolism, Persistence and Transport of Radiolabelled Dimethoate in Plant-Soil Ecosystem
- 卵磷脂之代謝能值及影響其促進肉雞對脂肪消化率之因子--脂肪種類及年齡
- 藥物代謝、交互作用與副作用
- Effects of Acute Clozapine Administration on Local Cerebral Glucose Utilization in Rats
- 血液透析中心患者之營養評估
- 肥胖婦女減重前後體組成及熱量代謝之變化
頁籤選單縮合
題 名 | Vitamin E and Its Metabolic Pathways in Mammals and Birds=維生素E及其在哺乳與鳥類體內之不同代謝途徑 |
---|---|
作 者 | 林義福; | 書刊名 | 台灣農學會報 |
卷 期 | 12:2 2011.04[民100.04] |
頁 次 | 頁151-163 |
分類號 | 437.111 |
關鍵詞 | 抗氧化劑; 代謝; α-生殖醇; Antioxidant; Metabolism; α-tocopherols; |
語 文 | 英文(English) |
中文摘要 | 維生素E為生殖醇(tocopherols)及生育三烯酚(tocotrienols)的通稱,維生素E最先被認為是有關動物必須的營養的成分,對動物之正常繁殖尤其重要。之後其被發現可以防止雛雞腦軟化症,因而維生素E被認為是維持生物細胞膜完整性的必需維生素。目前對維生素E功能的了解與研究,主要在抗氧化及消除細胞自由基的損害作用上,而這些主要來自哺乳動物的研究為主。脂蛋白扮演運輸系統的角色,經由血管及淋巴系統運送維生素。在鳥類,因缺乏功能性的腸道淋巴系,脂肪經門脈系統被肝臟吸收後以極低密度脂蛋白(VLDL)形式分泌出進入血液循環,極低密度脂蛋白進入循環系統與肝臟的型式被稱為portomicrons,與哺乳動物的乳糜微粒(chylomicrons)有所區別。生殖醇及生育三烯酚側鏈經由ω-羥基化作用(hydroxylation)及及β-氧化作用(oxidation)降解代謝。因為其脂溶性的特質,維生素E常蓄積於脂肪組織中,不同型式維生素E中,與α-生殖醇運送蛋白親和力差者,會被代謝成膽汁或尿液最後排泄出去。維生素的代謝尚有許多待證實,需要進一步的研究去釐清。 |
英文摘要 | Vitamin E is a general term for tocopherols and tocotrienols. Originally, vitamin E was considered a dietary factor of animal nutrition, especially important for normal reproduction. Later, since vitamin E was also found to be required for preventing encephalomalacia in chicks, it was recognized as an essential vitamin for maintaining the integrity of biological cell membranes. Currently, vitamin E is primarily known as an antioxidant in scavenging free radicals and thereby reducing cellular oxidative damage. Past studies regarding the functions of vitamin E were mainly mammal studies. Transport of vitamin E relies on the lipoproteins system through the vascular and lympathetic circulation. In birds, however, due to the lack of a functional intestinal lymphatic system, absorbed lipids enter the liver through the portal system where the dietary lipids are assembled and released as very low density lipoproteins (VLDL). The mode of entry of these dietary lipids into the circulation and liver was released as portomicrons for discerning chylomicrons in mammals. Tocopherols and tocotrienols are metabolized by side chain degradation through ω-hydorxylation and β-oxidation. Because of its physiochemical nature as a lipid, vitamin E tends to accumulate in the adipose tissue. Different forms of vitamin E with a lower affinity for the carrier α-tocopherol transfer protein are metabolized and finally excreted in the bile or urine. Many of the metabolic pathways are still unclear. Further studies are needed to clarify these details. |
本系統中英文摘要資訊取自各篇刊載內容。