Production of ethanol from mesquite [Prosopis juliflora (SW) D.C.] pods mash by Zymomonas mobilis in submerged fermentation

Abstract

Mesquite [Prosopis juliflora (SW) D.C.], a perennial tropical plant commonly found in Brazilian semi-arid region, is a viable raw material for fermentative processes because of its low cost and production of pods with high content of hydrolysable sugars which generate many compounds, including ethanol. This study aimed to evaluate the use of mesquite pods as substrate for ethanol production by Z. mobilis UFPEDA-205 in a submerged fermentation. The fermentation was assessed for rate of substrate yield to ethanol, rate of ethanol production and efficiency of fermentation. The very close theoretical (170 g L -1 ) and experimental (165 g L -1 ) maximum ethanol yields were achieved at 36 h of fermentation. The highest counts of Z. mobilis UFEPEDA-205 (both close to 6 Log cfu mL -1 ) were also noted at 36 h. Highest rates of substrate yield to ethanol (0.44 g ethanol g glucose -1 ), of ethanol production (4.69 g L -1 h -1 ) and of efficiency of fermentation (86.81%) were found after 30 h. These findings suggest mesquite pods as an interesting substrate for ethanol production using submerged fermentation by Z. mobilis.

Bioethanol Production from Biologically Pretreated Prosopis africana Pods using Pichia kudriavzevii SY4

“…Bioethanol production has been reported using Prosopis juliflora pods (da Silva et al, 2011), but there are no reports using P. africana pods (PAP). Here, we report bioethanol production from PAP by optimizing the hydrolysis and fermentation stages using the Full Factorial Design (FFD) and the Response Surface Methodology (RSM), respectively.…”