To summarize the study here, free sugar content in OPT
sap is the maximum (153 mg ml1 for total sugar and
128 mg ml1 for three main fermentable sugars) at 30e60 days
of storage after logging and the sap should be squeezed during
this period to obtain the highest sugar concentration for
further utilization such as the production of bioethanol.
Presently, sugar cane juice is used as one of the largest feedstocks
for bioethanol. Table 2 compares the sap of old oil palm
trunk with sugar cane juice as feedstock for bioethanol.
Possible ethanol yield from sap of old palm trunk is calculated