本實驗是針對以嗜鹽菌發酵生產的聚酯高分子，進行結構分析和熱性質測定。利用溶劑再沉澱法，分離出兩種PHBV共聚合體，分別含有10%及12%HV單元(PHBV10及PHBV12)，其中PHBV10佔有88%。而經GPC測定得到此PHBV共聚合體的分子量為57萬。另外實驗結果也證明菌粉中之聚酯高分子維持在無定形狀態，而經萃取出來後，即為一高度結晶之高分子，玻璃轉移溫度為0.56℃，熔點具有雙重溶解峰，熔點分別為133.5及143.5℃。 In this study, structures and thermal properties, of poly(hydroxyalkanoate), PHA, produced from Haloferax mediterranei were analyzed. The film was first dissolved in chloroform and then ten times volume of acetone was added into the solution. The solution was kept at freezer at -20 degree C for 1 day and then filtered. The precipitate was analyzed using NMR and found to be a PHBV copolymer with 10mol% of HV unit. The filtrate was dried and then dissolved in acetone. By adding nonsolvent methanol, a second precipitate was observed and subsequently analyzed by NMR. It was a PHBV copolymer with 12mol% of HV unit. The glass transition temperature and melting point of the PHBV were 0.56 degree C and 144.35 degree C, respectively, and the molecular weight (Mw) analyzed by GPC was 570,000.