Application of ammonia pretreatment to enable enzymatic hydrolysis of hardwood biomass

Sakuragi, Kiyoshi; Igarashi, Kiyohiko; Samejima, Masahiro

doi:10.1016/j.polymdegradstab.2017.12.008

Cited by 50 publications

(28 citation statements)

References 18 publications

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“…Extensive researches have also been conducted on ammonia-based alkali pretreatment because of non-corrosivity, non-toxicity and easy recovery of ammonia. Sakuragi et al (2018) studied the effects of ammonia pretreatment on six different hardwood species and reported that species with high xylan and low lignin contents promotes enzymatic hydrolysis more effectively. (Oladi and Aita, 2017) optimized the ammonia pretreatment conditions for greater yield of sugar from energy cane bagasse.…”

Section: Alkali Pretreatmentmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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Lignocellulosic biomass (LCB) is the most abundantly available bioresource amounting to about a global yield of up to 1. 3 billion tons per year. The hydrolysis of LCB results in the release of various reducing sugars which are highly valued in the production of biofuels such as bioethanol and biogas, various organic acids, phenols, and aldehydes. The majority of LCB is composed of biological polymers such as cellulose, hemicellulose, and lignin, which are strongly associated with each other by covalent and hydrogen bonds thus forming a highly recalcitrant structure. The presence of lignin renders the bio-polymeric structure highly resistant to solubilization thereby inhibiting the hydrolysis of cellulose and hemicellulose which presents a significant challenge for the isolation of the respective bio-polymeric components. This has led to extensive research in the development of various pretreatment techniques utilizing various physical, chemical, physicochemical, and biological approaches which are specifically tailored toward the source biomaterial and its application. The objective of this review is to discuss the various pretreatment strategies currently in use and provide an overview of their utilization for the isolation of high-value bio-polymeric components. The article further discusses the advantages and disadvantages of the various pretreatment methodologies as well as addresses the role of various key factors that are likely to have a significant impact on the pretreatment and digestibility of LCB.

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Section: Alkali Pretreatmentmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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“…The preparation and chemical analysis of untreated or ammonia-treated birch wood meal were previously reported [10]. In brief, a birch wood block was milled, and then sieved to obtain 40-mesh-passed meal.…”

Section: Preparation and Chemical Analysis Of Biomassmentioning

confidence: 99%

“…It has been demonstrated that ammonia pretreatment also alters the polymorphic form of crystalline cellulose with a low water content, transforming the natural crystalline form (cellulose I) to cellulose III I [8], which is far more susceptible to enzymatic degradation [9]. Moreover, we have recently reported that ammonia pretreatment is effective for improving enzymatic saccharification of not only grass biomasses but also hardwood biomasses with high xylan and low lignin contents such as birch wood and willow wood [10]. Nevertheless, searching for effective enzymes for the conversion of ammonia-treated hardwood biomass is still under development.…”

Section: Introductionmentioning

confidence: 99%

Secretome analysis of the basidiomycete Phanerochaete chrysosporium grown on ammonia-treated lignocellulosic biomass from birch wood

et al. 2018

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Ammonia pretreatment is a promising technique for enhancing enzymatic saccharification of lignocellulosic biomass. However, an enzymatic cocktail suitable for the breakdown of pretreated biomass samples is still being developed. The basidiomycete Phanerochaete chrysosporium is a well-studied fungus with regard to bioconversion of lignocellulosic biomass. In the present work, we analyzed proteins secreted by P. chrysosporium grown on untreated and ammonia-treated birch wood meal. Fungal growth, xylanase activity, and extracellular protease activity increased in the media containing the ammoniatreated biomass; however, cellulase production decreased compared to that observed in the untreated biomass. Secreted extracellular proteins were separated by two-dimensional electrophoresis and identified by liquid chromatography ion-trap mass spectrometry. Fifty-five spots corresponding to secreted proteins were chosen for further analysis. In the culture with ammonia-treated biomass, the relative concentration of a xylanase belonging to glycoside hydrolase (GH) family 11 increased, while acetyl xylan esterases belonging to carbohydrate esterase family 1 decreased. Moreover, GH family 10 xylanases were promoted proteolysis in the culture of ammonia-treated biomass, leading to the loss of family 1 carbohydrate-binding modules. These results indicated that P. chrysosporium produced enzymes related to the recognition of structural changes on xylan with de-acetylation and introduction of nitrogen by ammonia pretreatment of birch wood meal.

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“…Phitsuwan et al (2016) reported a 72Á9% xylan recovery yield after ammonia aqueous (27% w/w) treatment at 60°C for 7 days. The initial study showed that a major difference between the alkali (NaOH) and alkaline (ammonia) treatments is cleavage of the glucuronoyl and acetyl ester linkages on the main chain of xylan after ammonia treatment (Sakuragi et al 2018). It led to a difference in the solubilization capabilities and saccharide composition of xylan.…”

Section: Discussionmentioning

confidence: 99%

Production of prebiotic xylooligosaccharide from aqueous ammonia‐pretreated rice straw by β‐xylosidase of Weissella cibaria

2019

J Appl Microbiol

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Aims This study focuses on the development of a new strategy xylooligosaccharide (XOS) production from aqueous ammonia‐pretreated rice straw (A‐PRS), followed by β‐xylosidase hydrolysis produced by the newly identified strain Weissella cibaria FB069. Methods and Results We report a higher efficiency of A‐PRS, including the removal of lignin and increase in cellulose and xylan content, compared to that of the alkali and stream explosion methods. Using the ammonia pretreatment method, rice straw was used to obtain 32·4% xylan. The crude xylanase from W. cibaria was used to hydrolyse A‐PRS over different hydrolysis times. The highest XOS yield (131 mg XOS per gram rice straw) was observed after 10 h. XOS produced from the PRS was tested on stimulation effect on Bifidobacterium and Lactobacillus. Conclusion The possibility of XOS production from PRS using β‐xylosidase with strong prebiotic properties. Significance and Impact of the Study We investigated the new strain for signification production of XOS. The two‐stage process here described could help to further explore the optimization conditions for prebiotic production. Additionally, the stimulation effect of XOS from alternative source has a promising prospect in functional food.

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Application of ammonia pretreatment to enable enzymatic hydrolysis of hardwood biomass

Cited by 50 publications

References 18 publications

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Secretome analysis of the basidiomycete Phanerochaete chrysosporium grown on ammonia-treated lignocellulosic biomass from birch wood

Production of prebiotic xylooligosaccharide from aqueous ammonia‐pretreated rice straw by β‐xylosidase of Weissella cibaria

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