Green biorefinery — the ultra-high hydrolysis rate and behavior of<i>Populus tomentosa</i>hemicellulose autohydrolysis under moderate subcritical water conditions

Xu, Youlong; Wang, Pengfei; Xue, Shiwen; Kong, Fangong; Ren, Hao; Zhai, Huamin

doi:10.1039/d0ra02350g

Cited by 12 publications

(9 citation statements)

References 49 publications

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“…It converted 44.8% of substrates in furfural at 170°C with 1% sulfuric acid. Recently, Xu Y. et al investigated the behavior of Populus tomentosa hemicellulose and the formation of furfural in the autohydrolysis process at 160–180°C ( Xu Y. et al, 2020 ). The hemicellulose was converted to corresponding monosaccharides at an ultra-high hydrolysis rate.…”

Section: Hydrolysis Of Hemicellulosesmentioning

confidence: 99%

The Kinetics Studies on Hydrolysis of Hemicellulose

Yuan

Liu

et al. 2021

Front. Chem.

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The kinetics studies is of great importance for the understanding of the mechanism of hemicellulose pyrolysis and expanding the applications of hemicellulose. In the past years, rapid progress has been paid on the kinetics studies of hemicellulose hydrolysis. In this article, we first introduced the hydrolysis of hemicelluloses via various strategies such as autohydrolysis, dilute acid hydrolysis, catalytic hydrolysis, and enzymatic hydrolysis. Then, the history of kinetic models during hemicellulose hydrolysis was summarized. Special attention was paid to the oligosaccharides as intermediates or substrates, acid as catalyst, and thermogravimetric as analyzer method during the hemicellulose hydrolysis. Furthermore, the problems and suggestions of kinetic models during hemicellulose hydrolysis was provided. It expected that this article will favor the understanding of the mechanism of hemicellulose pyrolysis.

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Section: Hydrolysis Of Hemicellulosesmentioning

confidence: 99%

The Kinetics Studies on Hydrolysis of Hemicellulose

Yuan

Liu

et al. 2021

Front. Chem.

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“…[ 13 ] They obtained high xylooligosaccharide (XOS) and glucose at severity 3.46. [ 14 ] On the other hand, the severity factors of 2.07–2.67 used in this paper are considered low as compared to other hydrothermal pretreatment studies. [ 13,14 ] Even though a high severity factor could release higher sugar concentration from biomass, optimal hydrothermal conditions should be considered since harsh conditions could further degrade the free‐sugars to degradation products such as furans which is unfavorable for fermentation.…”

Section: Resultsmentioning

confidence: 99%

“…[14] On the other hand, the severity factors of 2.07-2.67 used in this paper are considered low as compared to other hydrothermal pretreatment studies. [13,14] Even though a high severity factor could release higher sugar concentration from biomass, optimal hydrothermal conditions should be considered since harsh conditions could further degrade the free-sugars to degradation products such as furans which is unfavorable for fermentation. [15] On another note, it seems that the dry grinding of EPFG positively affects the concentration of monomeric sugars in the liquid fraction.…”

Section: Effect Of Mild Hydrothermal Pre-treatment Time On the Compos...mentioning

confidence: 99%

Structural Modification of Empty and Partially Filled Paddy Grain Through Hydrothermal Pre‐treatment as a Novel Substrate for Fermentable Glucose Production

et al. 2022

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In this study, two conditions of empty and partially filled paddy grain (EPFG) (unground and ground) are pre‐treated using a mild hydrothermal process at 120 °C at 30–120 min. The pre‐treatment condition which shows potential structural changes for sugar conversion (gelatinization of starch, reduction of hemicellulose to 11.8%, and increased in cellulose to 43.3%) involves combination of dry grinding and hydrothermal pre‐treatment at 60 min. In this condition, the starch and sugars released in the liquid fraction is high at 127 and 37.1 mg g−1, respectively, which can easily be converted into glucose without the need of enzyme usage. The effectiveness of the pre‐treatment on EPFG structural changes is further confirmed through scanning electron microscopy (SEM) and X‐ray diffraction (XRD), showing disruption of structures leading to amorphous biomass. Glucose production of pre‐treated ground EPFG (G‐EPFG) shows higher value at 30.13 g L−1 for 10% solid loading than the untreated samples. Overall, the results suggest that EPFG produced as waste in paddy milling factories can be a potential feedstock for a biorefinery based on the findings and processes derived from this study.

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“…The values decreased from 53.9% to 46.6% as temperature and time increased, mainly due to the progressive solubilization of some components of the raw material such as hemicellulosic sugars, extractives, and soluble ashes. These are the compounds that are most easily solubilized in this type of hydrothermal pretreatment, since their structure is less complex than that of other components of the vegetable waste [ 41 , 49 , 51 , 63 , 64 , 65 ]. The decrease in the solid recovery was well in agreement with the literature [ 35 , 66 , 67 , 68 , 69 ].…”

Section: Resultsmentioning

confidence: 99%

Liquid Hot Water Pretreatment and Enzymatic Hydrolysis as a Valorization Route of Italian Green Pepper Waste to Delivery Free Sugars

Martín-Lara

Chica-Redecillas

Pérez

et al. 2020

Foods

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In this work, liquid hot water pretreatment (autohydrolysis) was used to improve enzymatic hydrolysis of a commonly consumed vegetable waste in Spain, Italian green pepper, to finally produce fermentable sugars. Firstly, the effect of temperature and contact time on sugar recovery during pretreatment (in insoluble solid and liquid fraction) was studied in detail. Then, enzymatic hydrolysis using commercial cellulase was performed with the insoluble solid resulting from pretreatment. The objective was to compare results with and without pretreatment. The results showed that the pretreatment step was effective to facilitate the sugars release in enzymatic hydrolysis, increasing the global sugar yield. This was especially notable when pretreatment was carried out at 180 °C for 40 min for glucose yields. In these conditions a global glucose yield of 61.02% was obtained. In addition, very low concentrations of phenolic compounds (ranging from 69.12 to 82.24 mg/L) were found in the liquid fraction from enzymatic hydrolysis, decreasing the possibility of fermentation inhibition produced by these components. Results showed that Italian green pepper is an interesting feedstock to obtain free sugars and prevent the enormous quantity of this food waste discarded annually.

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Green biorefinery — the ultra-high hydrolysis rate and behavior ofPopulus tomentosahemicellulose autohydrolysis under moderate subcritical water conditions

Abstract: A high monosaccharide conversion rate of hemicellulose in a green solvent and under moderate reaction conditions for industrialization is one of the most important keys in a lignocellulosic biorefinery.

Cited by 12 publications

References 49 publications

The Kinetics Studies on Hydrolysis of Hemicellulose

The Kinetics Studies on Hydrolysis of Hemicellulose

Structural Modification of Empty and Partially Filled Paddy Grain Through Hydrothermal Pre‐treatment as a Novel Substrate for Fermentable Glucose Production

Liquid Hot Water Pretreatment and Enzymatic Hydrolysis as a Valorization Route of Italian Green Pepper Waste to Delivery Free Sugars

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