Comparison of strategies for the simultaneous saccharification and fermentation of cashew apple bagasse using a thermotolerant Kluyveromyces marxianus to enhance cellulosic ethanol production

Barros, Emanuel Meneses; Carvalho, Victor Martins de; Rodrigues, Tigressa Helena Soares; Rocha, Maria Valderez Ponte; Gonçalves, Leandra Regina

doi:10.1016/j.cej.2016.09.006

Cited by 57 publications

(15 citation statements)

References 49 publications

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“…With the use of only one bioreactor, capital and operational costs for the SSF process are lower, compared to those of the SHF process. In addition, the time required for the SSF process is shorter, leading to a higher productivity [28]. SSF has been widely investigated for ethanol production from various biomass, including Napier grass [29], cornstalks [30], and cogongrass [31].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Hydrogen Production from Chlorella sp. Biomass by Pre-Hydrolysis with Simultaneous Saccharification and Fermentation (PSSF)

et al. 2019

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Simultaneous saccharification and fermentation (SSF) and pre-hydrolysis with SSF (PSSF) were used to produce hydrogen from the biomass of Chlorella sp. SSF was conducted using an enzyme mixture consisting of 80 filter paper unit (FPU) g-biomass−1 of cellulase, 92 U g-biomass−1 of amylase, and 120 U g-biomass−1 of glucoamylase at 35 °C for 108 h. This yielded 170 mL-H2 g-volatile-solids−1 (VS), with a productivity of 1.6 mL-H2 g-VS−1 h−1. Pre-hydrolyzing the biomass at 50 °C for 12 h resulted in the production of 1.8 g/L of reducing sugars, leading to a hydrogen yield (HY) of 172 mL-H2 g-VS−1. Using PSSF, the fermentation time was shortened by 36 h in which a productivity of 2.4 mL-H2 g-VS−1 h−1 was attained. To the best of our knowledge, the present study is the first report on the use of SSF and PSSF for hydrogen production from microalgal biomass, and the HY obtained in the study is by far the highest yield reported. Our results indicate that PSSF is a promising process for hydrogen production from microalgal biomass.

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Section: Introductionmentioning

confidence: 99%

Enhancing Hydrogen Production from Chlorella sp. Biomass by Pre-Hydrolysis with Simultaneous Saccharification and Fermentation (PSSF)

et al. 2019

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“…The final ethanol percentage per volume of solution (%V ethanol /V solution ) must also be observed, at least 4% (v/v) should be achieved for an efficient distillation (Daramola and Ayeni 2020;Koppram et al 2014). In this work, efficiency ( ) of sugar conversion to ethanol (de Barros et al 2017;Pereira et al 2019;Pinheiro et al 2017) was chosen as the response variable for optimization, since it is the ratio between the yield of ethanol per consumed sugar (Y P/S ) and the theoretical value of Y P/S . Therefore, the current paper aims to evaluate a scale-up procedure for ethanol production by a flocculent S. cerevisiae grown on cashew apple juice (CAJ).…”

Section: Introductionmentioning

confidence: 99%

“…However, only 1520% of the peduncle is used industrially; most of it spoils in the field due to its low cost. In order to add value to the cashew agroindustry, first and second-generation ethanol was produced on a laboratory scale using juice or bagasse from cashew apple (de Barros et al 2017;Costa et al 2015;Pacheco et al 2010;Rocha et al 2011) following the concept of biorefinery (Correia et al 2020;Rocha et al 2014;Silva et al 2018). However, the scale-up was not conducted, and it is an important step for the implementation in micro distilleries or at an industrial scale.…”

Section: Introductionmentioning

confidence: 99%

Optimization and scale-up of ethanol production by a flocculent yeast using cashew apple juice as feedstock

Pinheiro

Barros

Rocha

et al. 2020

Braz. J. Chem. Eng.

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Biofuels have been gaining more space in the global energy sector, with special attention to ethanol, which has shown growing demand. Ethanol is a potential and promising alternative fuel due to the use of abundant renewable sources and its combustion characteristics. From this scenario, this research aimed to optimize ethanol production by a flocculant Saccharomyces cerevisiae CCA008 using cashew apple juice (CAJ) as feedstock. The alcoholic fermentation of CAJ was influenced for all evaluated variables (inoculum and substrate concentration, temperature, and agitation) and statistical models were successfully applied to describe the interaction between these variables and to optimize the operating conditions. The optimum conditions were initial substrate concentration (S 0) of 102 g L −1 , inoculum concentration (X 0) of 5 g L −1 , temperature (T) and agitation (Agit) settings at 34 °C and 140 rpm, respectively. Last, but not least, the scale-up of ethanol production was carried out using the predicted optimum operating conditions, the fluid dynamics characteristics and applying the best scaleup criterion (power per unit of volume). The efficiencies of the processes (on bench and pilot-scale) were not significantly different and high efficiencies (96.6-98.2%) were achieved, demonstrating satisfactory results. Moreover, maximum ethanol concentration (P max), Y P/S and productivity (Q P) did not vary significatively when the process was scaled-up. On the pilotscale, P max , Y P/S and Q P were 49.2 ± 2.2 g L −1 , 0.493 ± 0.00 g g −1 and 5.0 ± 0.2 g L −1 h −1 , respectively. Therefore, ethanol could be efficiently produced by the fermentation of CAJ using the flocculent yeast S. cerevisiae CCA008 and the process could be easily scaled up.

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“…There has been increased interest over the past decade in SSF for many processes including the production of biochemicals like enzymes (Abraham et al, 2014;Pitol et al, 2016) and the pretreatment of lignocellulose (de Barros et al, 2017). This has spurred work in SSF bioreactor design to increase efficiency (Mitchell et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of sophorolipids from stearic acid by solid-state fermentation, a cleaner alternative to chemical surfactants

Jiménez-Peñalver

Castillejos

Koh

et al. 2018

Journal of Cleaner Production

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In this manuscript, we approach the production of biosurfactants as a cleaner alternative to the chemically-produced surfactants currently used in a wide range of industries. Sophorolipids are microbially produced biosurfactants of the glycolipid type that have entered the market in select applications such as detergent or cosmetic formulation ingredients. This study focuses on sophorolipid production by the yeast Starmerella bombicola from stearic acid (C18:0), a low-cost carbon source that is difficult to work with in submerged fermentation since it remains a solid due to its high melting temperature. Consequently, optimizations of solidstate fermentation inoculated with Starmerella bombicola were studied for conversions of stearic acid and molasses to sophorolipids. Polyurethane foam functioned as the inert support. The effect of polyurethane foam density and water holding capacity was assessed and the process was optimized in terms of substrate and inoculum ratio. The best conditions were: foam with a density of 32 kg m-3 at 75% water holding capacity, 1.17:1 molasses/stearic acid (w/w) and 5% (v/w) inoculum, to obtain a yield of 0.211 g sophorolipids per g of substrates. Mass spectrometry revealed that the sophorolipids produced herein had high concentrations of diacetylated acidic and lactonic C18:0 forms. The results of interfacial properties studies revealed that C18:0 sophorolipids had promising surface tension lowering capacity and emulsification behavior. This study describes a new strategy to produce biosurfactants using low environmental impact technologies as an alternative to traditional ways to produce chemical detergents.

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Comparison of strategies for the simultaneous saccharification and fermentation of cashew apple bagasse using a thermotolerant Kluyveromyces marxianus to enhance cellulosic ethanol production

Cited by 57 publications

References 49 publications

Enhancing Hydrogen Production from Chlorella sp. Biomass by Pre-Hydrolysis with Simultaneous Saccharification and Fermentation (PSSF)

Enhancing Hydrogen Production from Chlorella sp. Biomass by Pre-Hydrolysis with Simultaneous Saccharification and Fermentation (PSSF)

Optimization and scale-up of ethanol production by a flocculent yeast using cashew apple juice as feedstock

Production and characterization of sophorolipids from stearic acid by solid-state fermentation, a cleaner alternative to chemical surfactants

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