Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform

Darvekar, Pratik; Holtzapple, Mark T.

doi:10.1007/s12010-015-1930-6

Cited by 12 publications

(21 citation statements)

References 33 publications

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“…The slurry was then transported to the laboratory to be prepared for analysis. Detailed information is presented elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…For the duration of the project, these conditions were standardized. More details are found elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…Animal feed studies show that shocking lime‐treated corn stover can produce a highly digestible feed that could potentially displace corn grain . Recent studies have shown shock treatment can increase carboxylic acid yields by as much as 10–15%, in addition to increasing fermentation rates …”

Section: Introductionmentioning

confidence: 99%

“…21 Recent studies have shown shock treatment can increase carboxylic acid yields by as much as 10-15%, in addition to increasing fermentation rates. 23 Overall, shock treatment technology shows tremendous promise to add value and improve the economics of bioprocesses, especially in the animal feed industry. Considering large amounts of arable land are devoted to growing grain solely for feeding animals, processing lignocellulose into highly digestible animal feed can have profound impacts on the world food supply.…”

Section: Introductionmentioning

confidence: 99%

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Shock treatment of corn stover

Bond

Rughoonundun

Petersen

et al. 2017

Biotechnology Progress

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Corn stover digestibility was enhanced via shock treatment. A slurry of lime-treated corn stover was placed in a partially filled closed vessel. From the ullage space, either a shotgun shell was fired into the slurry, or a gas mixture was detonated. Various conditions were tested (i.e., pressures, depth, solids concentrations, gas mixtures). A high pressurization rate (108,000 MPa/s shotgun shells; 4,160,000 MPa/s hydrogen/oxygen detonation) was the only parameter that improved enzymatic digestibility. Stoichiometric propane/air deflagration had a low pressurization rate (37.2 MPa/s) and did not enhance enzymatic digestibility. Without shock, enzymatic conversion of lime-treated corn stover was 0.80 g glucan digested/g glucan fed with an enzyme loading of 46.7 mg protein/g glucan. With shock, the enzyme loading was reduced by ∼2× while maintaining the same conversion. Detonations are extraordinarily fast; rapidly cycling three small vessels (0.575 m each) every 7.5 s enables commercially relevant shock treatment (2,000 tone/day). © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:815-823, 2017.

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“…The slurry was then transported to the laboratory to be prepared for analysis. Detailed information is presented elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…For the duration of the project, these conditions were standardized. More details are found elsewhere …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shock treatment of corn stover

Bond

Rughoonundun

Petersen

et al. 2017

Biotechnology Progress

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“…More than 90% of global production of plant biomass is lignocellulosic biomass, which is composed of cellulose, hemicellulose, and lignin [7]. Recalcitrant lignocellulosic biomass is converted to monomer sugars via pretreatment and enzymatic hydrolysis [8]. Many pretreatment methods maximize exposure of carbohydrate polymers (cellulose and hemicellulose) with effective separation of the lignin portion, which is an interference biopolymer during bioconversion [9] [10].…”

mentioning

confidence: 99%

Sustainable Production of Microbial Lipids from Lignocellulosic Biomass Using Oleaginous Yeast Cultures

Lee¹,

Vadlani²,

Min³

2017

JSBS

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Microbial lipids derived from oleaginous yeast could be a promising resource for biodiesel and other oleochemical materials. The objective of this study was to develop an efficient bioconversion process from lignocellulosic biomass to microbial lipids using three types of robust oleaginous yeast: T. oleaginosus, L. starkeyi, and C. albidus. Sorghum stalks and switchgrass were utilized as feedstocks for lipid production. Among oleaginous yeast strains, T. oleaginous showed better performance for lipid production using sorghum stalk hydrolysates. Lipid titers of 13.1 g•L , which was substantially higher than the value reported in literature. Assessment of overall lipid yield revealed a total of 14.3 g and 13.3 g lipids were produced by T. oleaginosus from 100 g of raw sorghum stalks and switchgrass, respectively. This study revealed that minimization of sugar loss during pretreatment and selection of appropriate yeast strains would be key factors to develop an efficient bioconversion process and improve the industrial feasibility in a lignocellulose-based biorefinery.

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Assessment of shock pretreatment and alkali pretreatment on corn stover using enzymatic hydrolysis

Olokede

Hsu

Schiele

et al. 2021

Biotechnology Progress

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This study investigates digestibility enhancements of lignocellulose from shock pretreatment, alkaline pretreatment, and combination. Shock pretreatment subjects aqueous slurries of lignocellulose to shock waves, which disrupts its structure rendering it more susceptible to hydrolysis. Alkaline pretreatment submerges the biomass in aqueous alkali (NaOH, Ca(OH) 2 ), which removes lignin and acetyl groups. As indicators of digestibility, cellulase (CTec3) and hemicellulase (HTec3) were used to saccharify the pretreated corn stover and the resulting filtrate which contains about 10% of the sugars. Shock is most effective when it precedes alkaline pretreatment, presumably because it opens the biomass structure and enhances diffusion of pretreatment chemicals. Lignocellulose digestibility from calcium hydroxide treatment improves significantly with oxygen addition. In contrast, sodium hydroxide is a more potent alkali, and thereby eliminates the need for oxygen to enhance pretreatment.At low hydroxide loadings (<4 g OH À /100 g dry biomass), both NaOH and Ca(OH) 2 provide similar increases in digestibility; however, at high hydroxide loadings, NaOH is superior. For animal feed, Ca(OH) 2 treatment is recommended, because residual calcium ions are valuable nutrients. In contrast, for methane-arrested anaerobic digestion, NaOH treatment is preferred because NaHCO 3 is a stronger buffer. At 50 C, shock pretreatment improves sugar yields at all NaOH loadings. The effect of shock is most pronounced when the no-shock control employed the same soakingand-drying procedure as the shock treatment. The recommended conditions are shock treatment (5.52 bar [abs] initial H 2 /O 2 pressure) followed by 50 C alkaline treatment with NaOH loading of 4 g OH À /100 g dry biomass for 1 h.

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Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform

Cited by 12 publications

References 33 publications

Shock treatment of corn stover

Shock treatment of corn stover

Sustainable Production of Microbial Lipids from Lignocellulosic Biomass Using Oleaginous Yeast Cultures

Assessment of shock pretreatment and alkali pretreatment on corn stover using enzymatic hydrolysis

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