The effect of power-ultrasound on the pretreatment of acidified aqueous solutions of banana flower-stalk: Structural, chemical and statistical analysis

Author(s)

Villa-Velez, Harvey A. ^[1] ; Vaquiro, Henry A. ^[2] ; Telis-Romero, Javier ^[1]

Affiliation

^[1] Univ Estadual Paulista, Dept Engn & Tecnol Alimentos, Sao Paulo - Brazil

^[2] Univ Tolima, Fac Ingn Agron, Ibague 546, Tolima - Colombia

• Document type: Journal article
• Source: INDUSTRIAL CROPS AND PRODUCTS; v. 66, p. 52-61, APR 2015.
• Web of Science Citations: 11

Abstract

Various pretreatment techniques can change the physical and chemical structure of lignocellulosic biomass and improve the hydrolysis rates. High-intensity ultrasound could be a promising technique in the biomass pretreatment process. The objective of this work was to study the effect of biomass concentration, pH, ultrasonic power level and sonication time on the production yield in total sugars (S-T) and reducing sugars (S-R) during the pretreatment of banana flower-stalk biomass. A qualitative evaluation was carried out by scanning electron microscopy, showing a disruptive effect on the biomass structure at high ultrasonic power levels and low biomass concentrations. An experimental design with three-levels for the four-variables was used in order to set the conditions for the pretreatments. Stepwise regression (SRG) and an artificial neural network (ANN) were applied in order to establish mathematical models that could represent and be used to study the dependence of the factors on both the S-T and S-R yields. The statistical results indicated that the ANN approach provided a more accurate estimation than SRG. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/17497-5 - Determination of the best conditions of physical hydrolysis by power ultrasound in agroindustrial wastes
• Grantee: Javier Telis Romero
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants