| Abstract: | 白藜蘆醇（Resveratrol）是一種植物抗逆境素，廣泛分佈於葡萄皮、花生、虎杖、覆盆子中，具有調節脂質代謝、抑制低密度脂蛋白氧化、抗血小板凝集、保護心血管的作用。現階段取得白藜蘆醇可分為人工合成及天然物萃取二種方式，其中經由天然物取得又可分成經由生藥材直接萃取或透過微生物基因轉殖或發酵後萃取；在生藥材直接洗脫乾燥方式因天然植物所含物質複雜，純化過程必須經過質多種化學溶劑分離萃取，他的化學殘留問題是必須考慮的。但若選擇以微生物基因轉殖生成或使用特殊菌種先行發酵轉化含有白藜蘆醇糖苷生藥材，再行萃取，將可降低化學溶劑的使用也可增加純化物的產率。 目的 探討以微生物-德克酵母屬（Dekkera）轉化虎杖糖苷（Polydatin）所製造之白藜蘆醇（Resveratrol of biotransformation by microorganism, RSVB），在餵食高脂肪/高膽固醇飼料倉鼠動物模式下的降血脂效用評估。 設計與方法 倉鼠隨機分成四組：高脂飼料對照組（C）、高脂飼料加RSVB 5mg /Kg/BW（低劑量組, L）、高脂飼料加RSVB 20mg/Kg/BW（中劑量組, M）、及高脂飼料加RSVB 50 mg/Kg/BW（高劑量組, H）。倉鼠經6週高脂飼料同時搭配不同劑量之RSVB餵食後犧牲，取血液與肝臟測試三酸甘油酯（TG）、膽固醇、血糖及肝重量等。 結果 餵食期間倉鼠體重呈現穩定增加，顯示給予不同劑量之RSVB並未影響倉鼠食慾或成長。肝臟重量在RSVB-H組比C組為輕，且有顯著差異；肝臟重量與體重比值，C組比值較不同劑量之RSVB各組高且有顯著差異，顯示C組肝臟有偏重之趨勢。倉鼠血中脂質及血糖之變化方面，C組血糖值較其他三組高，且與中、高劑量RSVB組比較有統計上之差異，血中TG與總膽固醇濃度，RSVB組皆低於C組，且與部分劑量之RSVB組有統計上之差異。HDL-C在M組顯著高於C組與L組。LDL-C在RSVB-M及-H組都顯著低於C組，而HDL-C與LDL-C之比值在RSVB-M和RSVB-H組都顯著高於C組，顯示RSVB有調整不同膽固醇形式之作用。 結論 餵食以高脂肪/高膽固醇飼料的倉鼠若給予微生物轉化之白藜蘆醇可以有效降低血中脂質濃度並具有改善不同形式膽固醇濃度之功效。
Resveratrol is a plant stress-resistant compound which is widely distributed in the skin of grapes, peanuts, Polygonum cuspidatum Sieb. et Zucc. (Polygonum cuspidatum), and raspberries. It has the functions of regulating lipid metabolism, inhibiting oxidation of low density lipoprotein cholesterol (LDL-C), suppressing platelet aggregation, and protecting the cardiovascular system. Object The aim of the present study was to investigate the effect of decreasing blood lipids through resveratrol produced by microorganism biotransformation of Polydatin (RSVB) in hamsters treated with a high-fat (high- cholesterol) diet as an animal model of obesity. Methods and procedures The hamsters were randomly divided into four groups: high-fat diet control group (C), high-fat diet plus RSVB 5 mg/kg (low dosage group, L), high-fat diet plus RSVB 20 mg/kg (medium dosage group, M) and high-fat diet plus RSVB 50 mg/kg (high dosage group, H). During the experiment, the food intake and body weight were measured per week. The hamsters were sacrificed after six weeks of high-fat diet plus RSVB of different dosages. Blood and liver were obtained. Blood triglyceride, cholesterol, liver enzymes and sugar were assayed, and liver was weighed. Results The body weight increased gradually in every group. No difference among groups was noted in the weekly body weight or total body weight increases, which revealed that RSVB of different dosages did not influence the appetite or growth of the hamsters. In contrast to the group C, low liver weight was observed in the three RSVB groups, and significantly low in the RSVB groups M and H. Liver weight/body weight ratio in the group C was significantly high in relation to the three RSVB groups. The liver enzymes were lower in the three RSVB groups than the group C.The analysis indicated that the blood sugar is high in the group C compared with the three RSVB groups, and there was significance compared with the RSVB groups M and H. Blood triglyceride in the RSVB group H is significantly lower than the group C. Total blood cholesterol was noted significantly high in the group C compared with the three RSVB groups. Significantly HDL-C was observed in the RSVB group M compared with the group C and the RSVB group L. High HDL-C was also noted in the RSVB group H, but there was no significance. Compared with the group C, the RSVB groups M and H had significantly decreased LDL-C. The significantly high HDL-C/LDL-C ratio in the RSVB groups M and H compared with the group C demonstrated that RSVB has the tendency of modulating different types of blood cholesterol. Conclusions The major finding of the present study was that RSVB effectively decreased blood lipids and total blood cholesterol, and modulated different types of blood cholesterol in hamsters treated with a high-fat (high- cholesterol) diet. |
