Integrating bran starch hydrolysates with alkaline pretreated soft wheat bran to boost sugar concentration

Zhao, Jikai; Xu, Youjie; Zhang, Meng; Wang, Donghai

doi:10.1016/j.biortech.2020.122826

Cited by 31 publications

(34 citation statements)

References 47 publications

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“…The lignin content in the alkali pretreated hemp biomass was significantly lower (8.4-12.3%) compared to acid pretreated biomass (28.9-37.0%). It can be attributed to the re-condensation of disrupted lignin in case of acid pretreatment, whereas alkali pretreatment unlocks small lignin units [58]. Similarly, in another study, dilute alkali pretreatment performed with 1% NaOH at 170 • C for 30 min increased the glucan content from 40.7% in the raw biomass to 77.5% in the pretreated biomass, with a reduction in lignin from 15.74% to 11.05% after pretreatment [28].…”

Section: Pretreatment Strategies For Industrial Hempmentioning

confidence: 84%

Recent Advancements in Biological Conversion of Industrial Hemp for Biofuel and Value-Added Products

Jia

Kumar

et al. 2021

Fermentation

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Sustainable, economically feasible, and green resources for energy and chemical products have people’s attention due to global energy demand and environmental issues. Last several decades, diverse lignocellulosic biomass has been studied for the production of biofuels and biochemicals. Industrial hemp has great market potential with its versatile applications. With the increase of the hemp-related markets with hemp seed, hemp oil, and fiber, the importance of hemp biomass utilization has also been emphasized in recent studies. Biological conversions of industrial hemp into bioethanol and other biochemicals have been introduced to address the aforementioned energy and environmental challenges. Its high cellulose content and the increased production because of the demand for cannabidiol oil and hempseed products make it a promising future bioenergy and biochemical source. Effective valorization of the underutilized hemp biomass can also improve the cost-competitiveness of hemp products. This manuscript reviews recent biological conversion strategies for industrial hemp and its characteristics. Current understanding of the industrial hemp properties and applied conversion technologies are briefly summarized. In addition, challenges and future perspectives of the biological conversion with industrial hemp are discussed.

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Section: Pretreatment Strategies For Industrial Hempmentioning

confidence: 84%

Recent Advancements in Biological Conversion of Industrial Hemp for Biofuel and Value-Added Products

Jia

Kumar

et al. 2021

Fermentation

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“…The pretreatment conditions were adapted from our previous study. 12 Five grams of biomass and 50 mL of 1% NaOH (w/v) solution were loaded into 75 mL stainless-steel reactors (Swagelok, Kansas City Valve & Fitting Co., KS) at a solid/liquid ratio of 1/10. In total, 48 reactors were rapidly submerged into a sand bath (Techne Inc., Princeton, NJ), which was supplemented with a continuous air blast at a target temperature of 170 °C for 30 min.…”

Section: Experimental Sectionmentioning

confidence: 99%

“… 6 In our previous studies, dilute NaOH pretreatment achieved high lignin removal and sugar and ethanol yields. 12 …”

Section: Introductionmentioning

confidence: 99%

High Ethanol Concentration (77 g/L) of Industrial Hemp Biomass Achieved Through Optimizing the Relationship between Ethanol Yield/Concentration and Solid Loading

Zhao

Wang

et al. 2020

ACS Omega

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In this study, the relationships between ethanol yield/concentration and solid loading (6–21%) were investigated to enhance ethanol titer and avoid a random choice of solid loading for simultaneous saccharification and fermentation (SSF). Alkali-pretreated hemp biomass was used for SSF in four scenarios including Case I: 30 filter paper unit (FPU)-cellulase and 140 fungal xylanase unit (FXU)-hemicellulase/g-solid; Case II: 40 FPU-cellulase and 140 FXU-hemicellulase/g-solid; Case III: 30 FPU-cellulase and 140 FXU-hemicellulase/g-solid with 1% Tween80; and Case IV: 30 FPU-cellulase and 140 FXU-hemicellulase/g-solid with particle size reduction (<0.2 mm). Results showed that bioethanol yield and concentration had a negative linear ( R 2 = 0.76–0.93) and quadratic ( R 2 = 0.96–0.99) correlation with solid loading (6–21%), respectively. As compared to Case I and previous studies, an enhancement in ethanol yield and concentration through increasing cellulase dose (Case II) and adding Tween 80 (Case III) was overestimated, whereas particle size reduction (Case IV) extended the “solid effect”, evidenced by the highest ethanol concentration (77 g/L) achieved from SSF at the focus point of a quadratic model. An interpretation of the relationship between ethanol yield/concentration and solid loading not only avoids a blind selection of solid loading for SSF but also reduces extra enzymes and water consumption.

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“…Figure 2 a,c show that the untreated grass and hemp biomass have intact and rigid structures with well-ordered fibrous skeletons, effectively blocking access to lignocellulose [ 28 ]. After the pretreatment of the grass and hemp biomass with sodium hydroxide for, similar changes were observed on the surface of the biomass.…”

Section: Resultsmentioning

confidence: 99%

Effective Utilisation of Halophyte Biomass from Saline Soils for Biorefinering Processes

et al. 2021

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The salinity of European soil is increasing every year, causing severe economic damage (estimated 1–3 million hectares in the enlarged EU). This study uses the biomass of halophytes—tall fescue (grass) and hemp of the Białobrzeskie variety from saline soils—for bioenergy, second generation biofuels and designing new materials—fillers for polymer composites. In the bioethanol obtaining process, in the first stage, the grass and hemp biomass were pretreated with 1.5% NaOH. Before and after the treatment, the chemical composition was determined and the FTIR spectra and SEM pictures were taken. Then, the process of simultaneous saccharification and fermentation (SSF) was carried out. The concentration of ethanol for both the grass and hemp biomass was approx. 7 g·L−1 (14 g·100 g−1 of raw material). In addition, trials of obtaining green composites with halophyte biomass using polymers (PP) and biopolymers (PLA) as a matrix were performed. The mechanical properties of the composites (tensile and flexural tests) were determined. It was found that the addition of a compatibilizer improved the adhesion at the interface of PP composites with a hemp filler. In conclusion, the grass and hemp biomass were found to be an interesting and promising source to be used for bioethanol and biocomposites production. The use of annually renewable plant biomass from saline soils for biorefinering processes opens up opportunities for the development of a new value chains and new approaches to sustainable agriculture.

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Integrating bran starch hydrolysates with alkaline pretreated soft wheat bran to boost sugar concentration

Cited by 31 publications

References 47 publications

Recent Advancements in Biological Conversion of Industrial Hemp for Biofuel and Value-Added Products

Recent Advancements in Biological Conversion of Industrial Hemp for Biofuel and Value-Added Products

High Ethanol Concentration (77 g/L) of Industrial Hemp Biomass Achieved Through Optimizing the Relationship between Ethanol Yield/Concentration and Solid Loading

Effective Utilisation of Halophyte Biomass from Saline Soils for Biorefinering Processes

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