Desirability function for optimization of Dilute Acid pretreatment of sugarcane straw for ethanol production and preliminary economic analysis based in three fermentation configurations

Mesa, Leyanis; Martínez, Yenisleidy Martínez; Barrio, Edenny; González, E

doi:10.1016/j.apenergy.2017.03.018

Cited by 80 publications

(18 citation statements)

References 59 publications

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“…To improve the efficiency of saccharification, the structure and composition of the biomass are often modified using harsh physical, chemical or thermochemical pretreatments [11]. Dilute acid (DA) and hydrothermal (HT) pretreatments are two examples of well-established pretreatments commonly used for sugarcane biomass [12–15]. They both create an acidic environment which loosens the cell wall by targeting the removal of xylan and are favored over other pretreatments because they are inexpensive and efficient in hydrolyzing lignocellulose [16].…”

Section: Introductionmentioning

confidence: 99%

Relationship between sugarcane culm and leaf biomass composition and saccharification efficiency

Hodgson‐Kratky

Papa

Rodríguez

et al. 2019

Biotechnol Biofuels

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Background Lignocellulosic biomass is recognized as a promising renewable feedstock for the production of biofuels. However, current methods for converting biomass into fermentable sugars are considered too expensive and inefficient due to the recalcitrance of the secondary cell wall. Biomass composition can be modified to create varieties that are efficiently broken down to release cell wall sugars. This study focused on identifying the key biomass components influencing plant cell wall recalcitrance that can be targeted for selection in sugarcane, an important and abundant source of biomass. Results Biomass composition and the amount of glucan converted into glucose after saccharification were measured in leaf and culm tissues from seven sugarcane genotypes varying in fiber composition after no pretreatment and dilute acid, hydrothermal and ionic liquid pretreatments. In extractives-free sugarcane leaf and culm tissue, glucan, xylan, acid-insoluble lignin (AIL) and acid-soluble lignin (ASL) ranged from 20 to 32%, 15% to 21%, 14% to 20% and 2% to 4%, respectively. The ratio of syringyl (S) to guaiacyl (G) content in the lignin ranged from 1.5 to 2.2 in the culm and from 0.65 to 1.1 in the leaf. Hydrothermal and dilute acid pretreatments predominantly reduced xylan content, while the ionic liquid (IL) pretreatment targeted AIL reduction. The amount of glucan converted into glucose after 26 h of pre-saccharification was highest after IL pretreatment (42% in culm and 63.5% in leaf) compared to the other pretreatments. Additionally, glucan conversion in leaf tissues was approximately 1.5-fold of that in culm tissues. Percent glucan conversion varied between genotypes but there was no genotype that was superior to all others across the pretreatment groups. Path analysis revealed that S/G ratio, AIL and xylan had the strongest negative associations with percent glucan conversion, while ASL and glucan content had strong positive influences. Conclusion To improve saccharification efficiency of lignocellulosic biomass, breeders should focus on reducing S/G ratio, xylan and AIL content and increasing ASL and glucan content. This will be key for the development of sugarcane varieties for bioenergy uses.

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Section: Introductionmentioning

confidence: 99%

Relationship between sugarcane culm and leaf biomass composition and saccharification efficiency

Hodgson‐Kratky

Papa

Rodríguez

et al. 2019

Biotechnol Biofuels

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“…Compared to other pretreatment methods, by now, this pretreatment method is close to practical application in industrial production due to low chemical cost and utilization with diverse biomass feedstocks including hardwood and agricultural residues (Benjamin et al, 2013;Mesa et al, 2017). Typically, pretreated biomass is then subjected to enzymatic hydrolysis to produce glucose via a mixture of enzymes such as endoglucanase (EG), exoglucanase or cellobiohydrolases (CBHs), and β-glucosidase (Abraham et al, 2014).…”

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confidence: 99%

Characteristics of Lignin Fractions from Dilute Acid Pretreated Switchgrass and Their Effect on Cellobiohydrolase from Trichoderma longibrachiatum

Yao

Yoo

et al. 2018

Front. Energy Res.

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To investigate the interactions between acid pretreated switchgrass lignin and cellobiohydrolase (CBH), three different lignin fractions were isolated from dilute acid pretreated switchgrass by (i) ethanol extraction, followed by (ii) dioxane/H2O extraction, and (iii) cellulase treatment, respectively. Structural properties of each lignin fraction were elucidated by GPC, 13 C-NMR, and 2D-HSQC NMR analyses. The adsorptions of CBH to the isolated lignin fractions were also studied by Langmuir adsorption isotherms. Ethanolextractable lignin fraction, mainly composed of syringyl (S) and guaiacyl (G) units, had the lowest molecular weight, while dioxane/H2O-extracted lignin fraction had the lowest S/G ratio with higher content of p-coumaric acid (pCA) unit. The residual lignin fraction after enzymatic treatment had the highest S/G ratio without hydroxyphenyl (H) unit. Strong associations were found between lignin properties such as lignin composition and S/G ratio and its non-productive enzyme adsorption factors including the maximum adsorption capacity and binding strength.

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“…Microwave‐assisted DES extraction using the DES previously selected (ChCl:Glyc) was optimized by maximizing the content of total phenols of liquid extracts obtained after the extraction of BSG. The optimization process was carried out using the desirability function, which is a method that allows diverse responses to be optimized 50 . Thus, the total phenols response was determined using a second‐order polynomial equation (Eqn (1)):

Total phenols = 1.56 + 0.49 T + 0.042 C - 0.29 italicTC + 0.10 T^{2} - 0.41 C^{2}

(();, R^{2} = 0.9641, R^{2} adjust = 0.9461)

where T is the temperature (°C) and C is the percentage of water in the DES.…”

Section: Resultsmentioning

confidence: 99%

Microwave‐assisted deep eutectic solvent extraction of phenolic compounds from brewer's spent grain

López-Linares

Campillo

Coca

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUNDDeep eutectic solvents (DESs) have been tested as promising green solvents for the microwave‐assisted extraction of phenolic compounds from brewer's spent grain (BSG). Firstly, a preliminary screening with four different DESs was carried out in order to determine the most effective DES for recovering phenolic compounds (measured as total phenols) from BSG. Later, an experimental design using the DES found to be most effective in the preliminary screening was applied to optimize microwave‐assisted choline chloride (ChCl):glycerol extraction.RESULTSChCl:glycerol was the most effective DES tested in the preliminary screening to recover phenolic compounds (2.3 mg GA g−1 BSG), even more than methanol (80% v/v) as conventional solvent (1.2 mg GA g−1 BSG). On the other hand, using ChCl:glycerol as DES, a total phenols content of 2.89 mg GA g−1 BSG was obtained operating at 100 °C for 13.30 min and 37.46% (v/v) water in the DES, ferulic and coumaric acids being the most abundant. Moreover, a residual extracted solid with non‐disturbed structural carbohydrates was achieved, which could be successfully used in a biorefinery to obtain other products, such as biofuels or chemicals.CONCLUSIONSThe suitability of a novel and green extraction process based on DESs combined with microwave assistance for the recovery of phenolic compounds from BSG was demonstrated. © 2020 Society of Chemical Industry (SCI)

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Desirability function for optimization of Dilute Acid pretreatment of sugarcane straw for ethanol production and preliminary economic analysis based in three fermentation configurations

Cited by 80 publications

References 59 publications

Relationship between sugarcane culm and leaf biomass composition and saccharification efficiency

Relationship between sugarcane culm and leaf biomass composition and saccharification efficiency

Characteristics of Lignin Fractions from Dilute Acid Pretreated Switchgrass and Their Effect on Cellobiohydrolase from Trichoderma longibrachiatum

Microwave‐assisted deep eutectic solvent extraction of phenolic compounds from brewer's spent grain

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