The bio-oils produced from the pyrolysis of the untreated and pretreated D.fir samples were analysed for their water content by Karl Fischer titration following the ASTM D482 protocol.The bio-oils were thermogravimetrically analysed at a final temperature of 600°C and a heating rate of 10°c/min. The derivative of the Mass loss curves were fitted into chemical families following a method described elsewhere (Perez al., 2007). This method gave an overall chemical makeup of the bio-oils as a combination of volatiles and water, mono phenols, hydrolysable sugars, lignin oligomers,and cross linked sugars.