農業部水產試驗所全球資訊網

為評估龍鬚菜及馬尾藻作為能源海藻原料之可行性，本研究進行小琉球凸坪及恆春萬里桐地區潮下帶馬尾藻群落之生物量調查、人工採苗、培苗及海面養殖試驗，及台灣龍鬚菜養殖資料之分析。研究顯示馬尾藻人工養殖仍有困難，因此短期之內以陸上養殖的龍鬚菜做為海藻生質原料較為可行。分析三種海藻之碳水化合物，乾基重分別為石蓴31.5%、馬尾藻64.2%及龍鬚菜76.3%。為了探討海藻多醣及藻渣纖維的單醣成分及水解產率，故先進行海藻多醣的抽取，其最適條件為0.02 N酸浸泡0.3 hr後，再以100oC熱水萃取0.3 hr。所得藻渣以酸水解，測得之總醣及還原醣皆以龍鬚菜最高。龍鬚菜藻渣經酸纖維酵素及酸水解可得glucose及galactose兩種單醣，利用此基質接種Saccharomyces cerevisiae進行發酵可產出2 - 10 g/L的生質酒精，故龍鬚菜作為生質酒精之生產初估可行。

研究報告摘要(英) For evaluating the feasibility of using Gracilaria and Sargassum biomass as feedstock for energy production, this study investigated yield of cultivated Gracilaria in Taiwan and biomass variation of Sargassum community in the subtidal zone at Tu-ping (Hsiao-Liuchiu Island) and Wan-li-tong (Heng-Chun). Laboratory and sea-surface seedling culture experiments of Sargassum were also conducted. Results showed that seasonal variations of Sargassum was vary large, and the survival rate of cultivated Sargassum was low because of the biofoulings and typhoons in laboratory as well as in field. Gracilaria as feedstock for energy production could be more feasible at present. Three kinds of seaweed were analyzed for carbohydrate content in dry base weight, and the result that Ulva is 31.5%, Sargassum is 64.2%, and Gracilaria is 76.3%, respectively. In order to study the types of monosaccharide and their hydrolytic ratio derived from polysaccharide and dregs of seaweed. The polysaccharide of seaweed was extracted firstly. The optimal isolated condition was pretreated with 0.02 N acid for 0.3 h, and then extract in 100oC for 0.3 hr. The seaweed dregs were further hydrolyzed by acid, and Gracilaria had the highest content of total sugar and reducing sugar. Glucose and galactose could be obtained Gracilaria dregs hydrolyzed by cellulase and acid. By using these hydrolysates as formative base and inoculating with Saccharomyces cerevisiae. 2-10 g/L bioethanol was yield after fermentation. This study showed that Gracilaria is feasible to acquire bioethanol.