The amount of light and heavy lignin oligomers in the bio-oils were determined by cold water precipitation technique. 1.5g of a 1:1 mixture of oil and methanol was added to a kimax three neck flask containing 150 ml. of water and maintained at 4°C.The slurry formed due to lignin precipitation was filtered and the filtrate was collected for sugar anlysis. The lignin oligomers remaining ON the filter Was washed with CH2Cl2 and ofter the removal of the Solvent from the filtrate (evaporation),