Combined Steam Pretreatment and Enzymatic Hydrolysis of Starch-Free Wheat Fibers

Palmarola-Adrados, Beatriz; Galbe, Mats; Zacchi, Guido

doi:10.1007/978-1-59259-837-3_80

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…The DM content of wheat meal consists of 72.7% starch and 24.3% SFR, showing that this part of the crop could also be an important source of lignocellulose. Several studies have investigated ways in which the ethanol yield could be enhanced by utilizing this part of the crop [ 32 , 33 ]. However, pretreatment is required to facilitate the enzymatic hydrolysis of SFR fibres, which was not performed in the present study.…”

Section: Resultsmentioning

confidence: 99%

Ethanol production from mixtures of wheat straw and wheat meal

Erdei

Barta

Sipos

et al. 2010

Biotechnol Biofuels

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123

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BackgroundBioethanol can be produced from sugar-rich, starch-rich (first generation; 1G) or lignocellulosic (second generation; 2G) raw materials. Integration of 2G ethanol with 1G could facilitate the introduction of the 2G technology. The capital cost per ton of fuel produced would be diminished and better utilization of the biomass can be achieved. It would, furthermore, decrease the energy demand of 2G ethanol production and also provide both 1G and 2G plants with heat and electricity. In the current study, steam-pretreated wheat straw (SPWS) was mixed with presaccharified wheat meal (PWM) and converted to ethanol in simultaneous saccharification and fermentation (SSF).ResultsBoth the ethanol concentration and the ethanol yield increased with increasing amounts of PWM in mixtures with SPWS. The maximum ethanol yield (99% of the theoretical yield, based on the available C6 sugars) was obtained with a mixture of SPWS containing 2.5% water-insoluble solids (WIS) and PWM containing 2.5% WIS, resulting in an ethanol concentration of 56.5 g/L. This yield was higher than those obtained with SSF of either SPWS (68%) or PWM alone (91%).ConclusionsMixing wheat straw with wheat meal would be beneficial for both 1G and 2G ethanol production. However, increasing the proportion of WIS as wheat straw and the possibility of consuming the xylose fraction with a pentose-fermenting yeast should be further investigated.

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Section: Resultsmentioning

confidence: 99%

Ethanol production from mixtures of wheat straw and wheat meal

Erdei

Barta

Sipos

et al. 2010

Biotechnol Biofuels

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123

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“…MW-assisted heating is widely recognized as an effective means of deconstructing lignocellulosic biomass, as both thermal and non-thermal effects accelerate the breakdown of cellulose crystallinity (Chen et al 2011;de la Hoz et al 2005). Whilst MW-assisted dilute acid pretreatment has been adopted by some researchers (Chen et al 2012; Palmarola- Adrados et al 2004;Zhu et al 2015), others have used MW-assisted alkali pretreatment (Hu and Wen 2008;Singh et al 2014;Zhu et al 2006). It was found in the present study that MW-assisted alkali pretreatment was superior to the MW-assisted acid pretreatment in the case of cassava stems, leaves and peels.…”

Section: Sugar Utilization Patternmentioning

confidence: 99%

“…Binod et al (2012) treated sugarcane bagasse with 1% NaOH at 600 W MW power for 4 min and reported reducing sugar yields of 66.5 g/100 g. Microwave-assisted alkali pretreatment was reported as highly efficient in deconstructing cellulose and enhancing saccharification of wheat straw (Zhu et al 2006). MW-assisted dilute acid pretreatment has been studied for many LCBs such as wheat fibres, and sugarcane bagasse (Chen et al 2011;Palmarola-Adrados et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Bioethanol production from microwave-assisted acid or alkali-pretreated agricultural residues of cassava using separate hydrolysis and fermentation (SHF)

et al. 2018

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The effect of microwave (MW)-assisted acid or alkali pretreatment (300 W, 7 min) followed by saccharification with a triple enzyme cocktail (Cellic, Optimash BG and Stargen) with or without detoxification mix on ethanol production from three cassava residues (stems, leaves and peels) by was investigated. Significantly higher fermentable sugar yields (54.58, 47.39 and 64.06 g/L from stems, leaves and peels, respectively) were obtained after 120 h saccharification from MW-assisted alkali-pretreated systems supplemented (D+) with detoxification chemicals (Tween 20 + polyethylene glycol 4000 + sodium borohydride) compared to the non-supplemented (D0) or MW-assisted acid-pretreated systems. The percentage utilization of reducing sugars during fermentation (48 h) was also the highest (91.02, 87.16 and 89.71%, respectively, for stems, leaves and peels) for the MW-assisted alkali-pretreated (D+) systems. HPLC sugar profile indicated that glucose was the predominant monosaccharide in the hydrolysates from this system. Highest ethanol yields (, g/g), fermentation efficiency (%) and volumetric ethanol productivity (g/L/h) of 0.401, 78.49 and 0.449 (stems), 0.397, 77.71 and 0.341 (leaves) and 0.433, 84.65 and 0.518 (peels) were also obtained for this system. The highest ethanol yields (ml/kg dry biomass) of 263, 200 and 303, respectively, for stems, leaves and peels from the MW-assisted alkali pretreatment (D+) indicated that this was the most effective pretreatment for cassava residues.

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“…It is used mainly for the treatment of bagasse, such as wheat or rice straw, sugar cane, etc. The pre-treatment can enhance the bio-digestibility of the wastes for bioprocess applications to obtain, for instance, ethanol or biogas, and to increase the accessibility of the enzymes to the materials (De Bari et al, 2004;Palmarola-Adrados et al, 2004;Kurabi et al, 2005). High pressures (10-40 Kg/cm 2 ) and temperatures (180-240 ºC) are applied with or without the addition of acid in a short period of time, followed by explosive depressurisation.…”

Section: Steam Explosion System (Ses)mentioning

confidence: 99%

New Olive-Pomace Oil Improved by Hydrothermal Pre-Treatments

Rodríguez-Gutiérrez¹,

Lama-Muñoz²,

Méndez³

et al. 2012

Olive Oil - Constituents, Quality, Health Properties and Bioconversions

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Olive Oil-Constituents, Quality, Health Properties and Bioconversions 250 with a thick sludge consistency that contains 80 % of the olive fruit, including skin, seed, pulp and pieces of stones, which is later separated and usually used as solid fuel (Vlyssides et al., 2004). In Spain, over 90 % of olive oil mills use this system, which means that the annual production of this by-product is approximately 2,5-6 million tons, depending on the season (Aragon & Palancar, 2001). 1.2 Utilisation of olive oil wastes Alperujo presents many environmental problems due to its high organic content and the presence of phytotoxic components that make its use in further bioprocesses difficult (Rodríguez et al., 2007a). Most of these components mainly phenolic compounds, confer bioactive properties, to olive oil. The extraction of the phenolic compounds has a double benefit: the detoxification of wastes and the potential utilisation as functional ingredients in foods or cosmetics, or for pharmacological applications (Rodríguez et al., 2007a). Although olive mill wastes represent a major disposal problem and potentially a severe pollution problem for the industry, they are also a promising source of substances of high value. In the olive fruits, there is a large amount of bioactive compounds, many of them known to have beneficial health properties. During olive oil processing, most of the bioactive compounds remain in the wastes or alperujo (Lesage-Meessen et al., 2001).Therefore, new strategies are needed for the utilisation of this by-product to make possible the bioprocess applications and the phase separation of alperujo. Until now, efforts focussed on detoxifying these wastes prior to disposal, feeding, or fertilisation/composting, because they are not easy degradable by natural processes, or even used in combustion as biomass or fuel (Vlyssides et al., 2004). However, the recovery of high value compounds or the utilisation of these wastes as raw matter for new products is a particularly attractive way to reuse them, provided that the recovery process is of economic and practical interest. This, added to the alternative proposals to diminish the environmental impact, will allow the placement of the olive market in a highly competitive position, and these wastes should be considered as by-products (Niaounakis & Halvadakis, 2004). 1.3 Olive-pomace oil After VOO extraction, the residual oil, or crude olive-pomace oil (COPO), is extracted by organic solvent extraction or centrifugation from olive oil wastes. After the COPO refining step, the refined olive-pomace oil (ROPO) is blended with VOO, obtaining OPO for human consumption. Currently, the growing interest in OPO is due to its biological active minor constituents (Ruiz-Gutiérrez et al., 2009). The concentration of these components in OPO is higher than the concentration in VOO, with the exception of polar phenols (Perez-Camino & Cert, 1999). Today, new processes for COPO refining are studied in order to diminish the loss of minor components (Antonopoulos et al., 2006). Some ...

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Combined Steam Pretreatment and Enzymatic Hydrolysis of Starch-Free Wheat Fibers

Cited by 7 publications

References 7 publications

Ethanol production from mixtures of wheat straw and wheat meal

Ethanol production from mixtures of wheat straw and wheat meal

Bioethanol production from microwave-assisted acid or alkali-pretreated agricultural residues of cassava using separate hydrolysis and fermentation (SHF)

New Olive-Pomace Oil Improved by Hydrothermal Pre-Treatments

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