Mild alkaline/oxidative pretreatment of wheat straw

Curreli, Nicoletta; Fadda, Maria Benedetta; Rescigno, Antonio; Rinaldi, Andréa; Soddu, Giulia; Sollai, Francesca; Vaccargiu, Stefano; Sanjust, Enrico; Rinaldi, Augusto

doi:10.1016/s0032-9592(97)00020-4

Cited by 69 publications

(30 citation statements)

References 15 publications

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“…Also [18] achieved over 55% reduction in the lignin content within first 0.5 h of pretreatment using 0.5% sodium hydroxide solution at 120 °C. The pretreatment achieved in this study is in correlation with previous studies based on the suggestion of alkaline pretreatment at lower temperature with high alkaline concentration or vice versa [19]. Sodium hydroxide solution has shown to be more effective in deligninfication of banana trunk biomass than aqueous ammonium hydroxide.…”

supporting

confidence: 86%

Microwave-Alkaline Assisted Pretreatment of Banana Trunk for Bioethanol Production

Chidi¹,

Oluwatisin²,

Deborah³

2015

JEPE

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Pretreatment is one of the most important steps in the production bioethanol from lignocellulose materials. Alkaline pretreatment is a common mean of pretreatment but microwave oven could assist its efficiency as it can reduce the pretreatment time and improve the enzymatic activity during hydrolysis. The aim of this paper is to determine lignin removal from banana trunk using microwave-assisted alkaline (NaOH and NH 4 OH) pretreatments. The best pretreatment conditions were used for mass pretreatment before hydrolysis and fermentation. The result shows that, optimum lignin removal was with microwave-assisted NaOH pretreatment with the removal of up to 98% lignin at 2% (w/v (weight/volum)) sodium hydroxide, 170 W microwave power at 10 min. Microwave-assisted ammonium hydroxide pretreatment achieved 97% lignin removal at 1% ammonium hydroxide concentration and 680 W microwave power at 5 min. Microwave-alkaline assisted pretreatment increased the yield and quality of fermentable sugar after enzyme hydrolysis with NH 4 OH and ammonium hydroxide yielding 40% and 39% of ethanol, respectively. This result reveals that, well controlled microwave-alkaline assisted pretreatment of banana trunk could effectively remove lignin and give high bioethanol yield.

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supporting

confidence: 86%

Microwave-Alkaline Assisted Pretreatment of Banana Trunk for Bioethanol Production

Chidi¹,

Oluwatisin²,

Deborah³

2015

JEPE

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“…For the last few decades, the conversion of these resources into glucose and other reducing sugars has been considered as an attractive route for production of ethanol or other valuable chemicals (Curreli et al, 1997;Gaspar et al, 2005). A wide array of biomass sources, including agricultural residues such as corn stover, wheat and rice straw and forestry residue; industrial residues such as pulp and paper processing waste and energy crops such as switchgrass have been employed as biomass source.…”

Section: Introductionmentioning

confidence: 99%

Production of fermentable sugars by combined chemo-enzymatic hydrolysis of cellulosic material for bioethanol production

Muhammad

Adnan

Bokhari

et al. 2014

Braz. J. Chem. Eng.

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-To change the recalcitrant nature of the lignocellulosic material for maximum hydrolysis yield, a comprehensive study was done by using sulphuric acid as an exclusive catalyst for the pretreatment process. The enzymatic digestibility of the biomass [Water Hyacinth: Eichhornia crassipes] after pretreatment was determined by measuring the hydrolysis yield of the pretreated material obtained from twenty four different pretreatment conditions. These included different concentrations of sulphuric acid (0.0, 1.0, 2.0 and 3.0%), at two different temperatures (108 and 121 °C) for different residence times (1.0, 2.0 and 3.0h).The highest reducing sugar yield (36.65 g/L) from enzymatic hydrolysis was obtained when plant material was pretreated at 121 °C for 1.0 h residence time using 3.0% (v/v) sulphuric acid and at 1:10 (w/v) solid to liquid ratio. The total reducing sugars obtained from the two-stage process (pretreatment + enzymatic hydrolysis) was 69.6g/L. The resulting sugars were fermented into ethanol by using Saccharomyces cerevisiae. The ethanol yield from the enzymatic hydrolyzate was 95.2% of the theoretical yield (0.51g/g glucose), as determined by GS-MS, and nearly 100% since no reducing sugars were detected in the fermenting media by TLC and DNS analysis.

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“…In this respect, the production of fuel bio-ethanol from cellulose-containing biomass residues is studied worldwide. Such a process generally involves a certain type of biomass-pretreatment, which often makes use of heat (Garrote et al, 1999;Shimizu et al, 1998) and acid (Papatheofanous et al, 1995;Parajo and Santos, 1995) or alkali (Curreli et al, 1997;Sun et al, 2000). Biomasspretreatment is needed to make cellulose embedded in the plant cell wall accessible for enzymatic hydrolysis (Lynd, 1996;Lynd et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Standard assays do not predict the efficiency of commercial cellulase preparations towards plant materials

Kabel

Maarel²,

Klip³

et al. 2005

Biotech & Bioengineering

105

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Commercial cellulase preparations are potentially effective for processing biomass feedstocks in order to obtain bioethanol. In plant cell walls, cellulose fibrils occur in close association with xylans (monocotyls) or xyloglucans (dicotyls). The enzymatic conversion of cellulose/xylans is a complex process involving the concerted action of exo/endocellulases and cellobiases yielding glucose and xylanases yielding xylooligomers and xylose. An overview of commonly measured cellulase-, cellobiase-, and xylanase-activity, using respectively filter paper, cellobiose, and AZCL-dyed xylan as a substrate of 14 commercially available enzyme preparations from several suppliers is presented. In addition to these standardized tests, the enzyme-efficiency of degrading native substrates was studied. Grass and wheat bran were fractionated into a water unsoluble fraction (WUS), which was free of oligosaccharides and starch. Additionally, cellulose- and xylan-rich fractions were prepared by alkaline extraction of the WUS and were enzymatically digested. Hereby, the capability of cellulose and xylan conversion of the commercial enzyme preparations tested was measured. The results obtained showed that there was a large difference in the performance of the fourteen enzyme samples. Comparing all results, it was concluded that the choice of an enzyme preparation is more dependent on the characteristics of the substrate rather than on standard enzyme-activities measured.

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Mild alkaline/oxidative pretreatment of wheat straw

Cited by 69 publications

References 15 publications

Microwave-Alkaline Assisted Pretreatment of Banana Trunk for Bioethanol Production

Microwave-Alkaline Assisted Pretreatment of Banana Trunk for Bioethanol Production

Production of fermentable sugars by combined chemo-enzymatic hydrolysis of cellulosic material for bioethanol production

Standard assays do not predict the efficiency of commercial cellulase preparations towards plant materials

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