Pretreated of banana pseudo-stem as raw material for enzymatic hydrolysis and bioethanol production

Abstract

Abstract. Development of alternative energy is needed to solve the energy problem, including bioethanol. Banana pseudo-stem is a lignocellulose material that can used to produce bioethanol. Banana pseudo-stem has 28.83% cellulose and 19.39% lignin. The amount of lignin will reduce by pretreatment process. Variations of pretreatment methods by autoclaving of banana-pseudo stem in a steam, 0.5N, 1N, 1.5N, 2N NaOH solutions for 90 minutes were employed. Then the preteated samples were further enzymatic hydrolysed for 24, 48, 72 hours. The fermentation method of simultaneous saccharification and fermentation (SSF) was applied using cellulase enzyme and yeast of Saccharomyces cerevisiae for 120 hours. The variation of the pretreatment process by increasing of NaOH concentration solutions led to decreased the lignin content while increased in cellulose content. The lowest lignin content was 11.44% and the highest cellulose was 51.66%. The highest sugar content was 29.8 g/L (at pretreatment 2N NaOH solution, 72 hours hydrolysis). The highest bioethanol amount (4.32 g/L) was produced from pretreated banana stem using 2N NaOH solution.

Enzymatic Hydrolysis and Fermentation of Banana Pseudostem Hydrolysate to Produce Bioethanol

“…Although enzymatic hydrolysate of the fungal pretreated BPS yielded a low ethanol concentration (2.0 g/L), the ethanol yield was higher (0.40 g/g) than the chemically pretreated BPS [37]. Kusmiyati and Sukmaningtyas [72] reported 4.32 g/L ethanol produced from the alkaline (8% NaOH) pretreated BPS at a 10% solid loading in simultaneous saccharification and fermentation (SSF), while El-Zawawy et al [24] reported low ethanol concentrations (<3.5 g/L) from banana plant waste.…”