The Effect of Severity Factor on the Release of Xylose and Phenolics from Rice Husk and Rice Straw

Temiz, Emel; Akpınar, Özlem

doi:10.1007/s12649-016-9608-z

Cited by 17 publications

(9 citation statements)

References 33 publications

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“…The cellulose activity was measured following the NREL method [19]. In fact, the activity of the Cellic CTec2 was estimated in 123 FPU/mL, which is in agreement to the enzyme activity reported by Zhao et al, [30]. Then, the enzymatic hydrolysis of the pretreated CCS was performed.…”

Section: Saccharification Process (Enzymatic Hydrolysis)supporting

confidence: 73%

“…Thus, the pretreatment severity differs strongly when agricultural residues and woody biomass are used as raw materials. In fact, CCS gives a xylose yield of 34.68% applying a CSF of 1.07, while xylose yields of 75.9% and 75.6 for rice straw and rice husk are reported, respectively [30]. Hence, the research of the best acid pretreatment conditions for woody biomass is should be done avoiding the use of the typical values reported in the literature.…”

Section: Sugars and Inhibitory Compounds In Hydrolysatesmentioning

confidence: 99%

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Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Solarte-Toro

Chacón-Perez

Piedrahita-Rodríguez

et al. 2020

Energy

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Coffee-cut stems are a potential fermentable sugars source, which can be upgraded in different valueadded products and energy vectors. Nevertheless, there are few reports focused on the acid pretreatment and saccharification processes. Thus, this paper evaluates the effect of the acid pretreatment and saccharification conditions of coffee cut-stems to find the highest sugar yield. Thereafter, the influence of the residence time in the acid pretreatment and the b-glucosidase supplementation in the saccharification process were analyzed. The combined severity factor and crystallinity index were used as metrics to evaluate both processes. In all assays, an increase in the crystallinity index was observed. Furthermore, a nonlinear trend of the combined severity factor respect to the residence time in the acid pretreatment was evidenced. The highest sugar yield was 66.75% with a combined severity factor of 1.84. The better saccharification process was achieved at combined severity factor of 2.01 with a digestibility of 43%. The addition of b-glucosidase in the enzymatic hydrolysis allows increasing the value to 69.07%. Hence, low temperatures, acid concentrations, and the b-glucosidase supplementation allows obtaining a high sugar yield from coffee cut stems.

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Section: Saccharification Process (Enzymatic Hydrolysis)supporting

confidence: 73%

Section: Sugars and Inhibitory Compounds In Hydrolysatesmentioning

confidence: 99%

Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Solarte-Toro

Chacón-Perez

Piedrahita-Rodríguez

et al. 2020

Energy

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“…Especially, the mixture of 0.5% sulfuric acid and 5.5% formic acid seemed feasible alternative to singe acids, since amounts of sulfuric acid and formic acid in the mixture were only 1/3 and 1/8 of the amounts of the single acids, respectively. Also, all mixtures contained considerably less sulfuric and formic acid than what is used in literature at similar temperatures, and therefore acid mixtures were seen as good alternatives to single acid solutions [13,14,[35][36][37][38].…”

Section: Mixture Of Formic Acid and Sulfuric Acidmentioning

confidence: 83%

Selective hemicellulose hydrolysis of Scots pine sawdust

Rusanen

Lappalainen

Kärkkäinen

et al. 2018

Biomass Conv. Bioref.

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The depletion of fossil resources is driving forward the search for new and alternative renewable feedstocks in the production of renewable chemicals, which could replace the petroleum-based ones. One such feedstock is pine (Pinus sylvestris) sawdust, which is generated enormous amounts in Finnish sawmills yearly. However, prior to the utilization in high-value applications, it needs to be fractionated into its constituents. In this work, the objective was to produce monomeric hemicellulose sugars from pine sawdust without degrading cellulose or lignin simultaneously. The influence of the reaction temperature and time, as well as acid type and concentration, was studied. Based on the results, the temperature was the main distinguishing feature between cellulose and hemicellulose hydrolysis. Promising results were achieved with acid mixtures consisting of 0.5% sulfuric acid and 5.5 or 10% formic acid. At 120°C with the reaction time of 2 h, the mixtures produced hemicellulose sugars with the yields of 62%. These yields were comparable to the yields achieved in similar conditions with 1.5% sulfuric acid or 40% formic acid. Therefore, by using an acid mixture, the concentration of a single acid could be reduced significantly. The solid fractions remaining after the hydrolysis consisted mainly of cellulose and lignin, which verified the selectivity of the hemicellulose hydrolysis. Also, the fractionation of the remaining solids confirmed that the utilization of all the sawdust components is feasible.

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“…In fact, dilute acid hydrolysis is often useful when lignocellulosic biomass has a significant content of hemicellulose since the hemicellulose fraction is more easily hydrolyzed than cellulose (Lloyd and Wyman 2005). However, there are several disadvantages of the dilute acid hydrolysis of the lignocellulosic biomass, such as the production of inhibitors, including acetic acid, furfural (Panagiotopoulos et al 2012) and phenolics from lignin degradation products (Akpınar et al 2012;Temiz and Akpinar 2017). To this list, it is important to also add the production of extractives (notably free phenolics) released from lignocellulosic biomass during the hydrolysis process.…”

Section: Introductionmentioning

confidence: 99%

Impact of pre-extraction on xylose recovery from two lignocellulosic agro-wastes

Kasangana

Auclair

Daassi

et al. 2022

BioRes

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A dilute acid hydrolysis of rice husk (RH), wheat straw (WS), and their extractive-free residues was investigated with the objective of recovering the highest yield of xylose while keeping at minimum its conversion into furfural. The hydrolysis conditions were determined for different concentrations of sulfuric acid and different reaction times at 121 °C. The pre-extraction with ethanol-water (1:1, v/v) was also examined as a parameter. Using response surface methodology, the optimum conditions for xylose production were identified as 1.8% of acid and 41.4 min of hydrolysis time for RH, while those for its counterpart EF-RH (extractives-free rice husks) were 1.0% acid concentration, for 60 min. The same conditions were also predicted for WS and its EF-WS. Under these conditions, the xylose yield was 79.6%, 82.8%, 94.3%, and 88.6% for RH, EF-RH, WS, and EF-RW, respectively. Under these conditions the minimal furfural yields obtained were 1.2% and 1.3% for RH and EF-RH, and 0.8% and 1.5%, for WS and EF-WS, respectively. These results suggested that the pre-extraction step before the acid hydrolysis affected, at least in part, the xylose recovery from RH, but it was not necessary for a better xylose yield of WS for its bioconversion into valuable bioproducts like xylitol.

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The Effect of Severity Factor on the Release of Xylose and Phenolics from Rice Husk and Rice Straw

Cited by 17 publications

References 33 publications

Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Selective hemicellulose hydrolysis of Scots pine sawdust

Impact of pre-extraction on xylose recovery from two lignocellulosic agro-wastes

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