RT journal article
T1 Valorisation of fungal hydrolysates of exhausted sugar beet pulp for lactic acid production
A1 Marzo Gago, Cristina
A1 Díaz Sánchez, Ana Belén
A1 Caro Pina, Ildefonso
A1 Blandino Garrido, Ana María
A2 Ingeniería Química y Tecnología de Alimentos
K1 Lactobacillus
K1 pH control
K1 kinetic model
K1 Lignocellulosic biomass
K1 Lactic acid fermentation
K1 Nitrogen supplementation
AB BACKGROUNDExhausted sugar beet pulp pellets (ESBPP) were used as raw material for lactic acid (LA) fermentation. The enzymatic hydrolysis of ESBPP was performed with the solid obtained after the fungal solid-state fermentation of ESBPP as a source of hydrolytic enzymes. Subsequently, a medium rich in glucose and arabinose was obtained, which was used to produce LA by fermentation. For LA production, two Lactobacillus strains were assayed and the effects of the supplementation of the hydrolysate with a nitrogen source and the mode of pH regulation of the fermentation were investigated. Moreover, a kinetic model for LA fermentation by Lactobacillus plantarum of ESBPP hydrolysates was developed.RESULTSL. plantarum produced a LA concentration 34% higher than that produced by L. casei. The highest LA concentration (30 g L−1) was obtained with L. plantarum when the hydrolysate was supplemented with 5 g L−1 yeast extract and the pH was controlled with CaCO3. The concentration of acetic acid differed depending on the concentration of CaCO3 added, producing its maximum value with 27 g L−1 CaCO3. The proposed kinetic model was able to predict the evolution of substrates and products depending on the variation of the pH in the hydrolysate, according to the amount of CaCO3 added.CONCLUSIONSESBPP can be valorised to produce LA. A pure LA stream or a mixture of LA and acetic acid, depending on the pH control method of the fermentation, can be produced. Thus, this control is of great interest depending on the destination of the effluent.
PB Wiley Online Library
YR 2020
FD 2020-12-26
LK http://hdl.handle.net/10498/29782
UL http://hdl.handle.net/10498/29782
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026