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