Thermal Properties of Spent-Sawdust Matrix after Cultivation of Grifola Frondosa for Bioethanol Production

James Ogbona; Hideno Tanaka; Hideki Aoyagi; Akihiro Hideno
Maitake mushroom, which is the fruiting body of Grifola frondosa (white-rot fungus), is extensively cultivated in Japan using mainly hardwood-sawdust (HS) as the medium. After cultivation, a large amount of spent-sawdust matrices (SSM) is discharged, resulting in high disposal cost. It is therefore necessary to develop effective methods for the bioconversion of SSM into fuels and chemicals. The moisture content of SSM is approximately 70%, and hence it should be dried to prevent decay during storage and reduce the transportation cost. In the present study, the thermal properties of SSM and their effects on the enzymatic hydrolysis of SSM were investigated by carrying out a differential thermogravimetric analysis (TG/DTA). The thermal analyses showed that the thermal decomposition of SSM occurs more easily than HS. A high heating rate (100°C min-1) and high temperature (500°C) did not improve the enzymatic hydrolysis of SSM. The optimal drying temperature for grinding and saccharification ranged from 25 to 200°C, while the optimal rate of temperature increase was 50°C min-1. Under these conditions, the sample temperature of was approximately 121°C. The results of this investigation support our previous conclusion that an autoclave treatment of SSM at 121°C is effective in improving the enzymatic hydrolysis of SSM.
Thermal Properties; Thermal Analysis; Spent-Sawdust Matrix; Enzymatic Hydrolysis; Grifola Frondosa
Download | Back to Issue| Archive