Ethanol Synthesis From Jackfruit (Artocarpus heterophyllus Lam.) Stone Waste as Renewable Energy Source

摘要

This study was aimed to develop renewable energy from jackfruit's stone. The jackfruit's stone was sliced and dried for 2 d to 4 d afterward the stoness were analyzed for fungi and microbes through microscope. The stone was retrieved from 9 mo and 1 yr shelf life through 2 d to 4 d drying process. The process was made in acid method resulted to high glucose on the solution level 25 %, pH 3.5, and temperature 135 °C in 3 min. The enzyme method was more simple and resulted 19.24 % higher glucose than acid method that is 17.36 %. Fermentation was using 0.03 g of Saccharomyces cerevisiae, 0.10 g of urea and 0.05 g of N-P-K on concentration solution of jackfruit' flour by adding 0.3 mL to 0.7 mL of alpha-amylase, 0.2 mL to 0.6 mL of Gluco-amylase for and fermentation process 3 d to 6 d result of ethanol level is 11 % to 13 %.