Enhancement of biomass conservation and enzymatic hydrolysis of rice straw by dilute acid-assisted ensiling pretreatment

Zhao, Jie; Tao, Xuxiong; Li, Junfeng; Jia, Yushan

doi:10.1016/j.biortech.2020.124341

Cited by 23 publications

(9 citation statements)

References 42 publications

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“…The ADF and NDF content declined during the silage; in particular, the ADF content significantly declined at the end of co-ensiling (p < 0.05), which was different from Mu et al's report that LP played no significant role in ADF and NDF content in amaranth and rice straw silage [9]. This different result could account for more organic acid to accelerate the lignocellulose hydrolysis and the different raw materials in the silage study [27].…”

Section: The Effects Of Lp Inoculation On Physicochemical Properties Of Silagecontrasting

confidence: 65%

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Keystone Taxa Lactiplantibacillus and Lacticaseibacillus Directly Improve the Ensiling Performance and Microflora Profile in Co-Ensiling Cabbage Byproduct and Rice Straw

Zhang

Shi

et al. 2021

Microorganisms

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Ensiling has been widely applied to cope with agricultural solid waste to achieve organic waste valorization and relieve environmental pressure and feedstuff shortage. In this study, co-ensiling of cabbage leaf byproduct and rice straw was performed with inoculation of Lactiplantibacillusplantarum (LP) to investigate the effects of inoculation on ensiling performance and microflora profiles. Compared to the control, LP inoculation preserved more dry matter (DM) content (283.4 versus 270.9 g·kg−1 fresh matter (FM) on day 30), increased lactic acid (LA) content (52.1 versus 35.8 g·kg−1 dry matter on day 15), decreased pH (3.55 versus 3.79 on day 15), and caused accumulation of acetic acid (AA), butyric acid (BA), and ammonia. The investigation showed that LP inoculation modified microflora composition, especially resisting potential pathogens and enriching more lactic acid bacteria (LAB) (p < 0.05). Moreover, Lactiplantibacillus and Lacticaseibacillus were identified as the keystone taxa that influenced physicochemical properties and interactions in microflora. They were also the main functional species that directly restrained undesirable microorganisms (p < 0.05), rather than indirectly working via metabolite inhibition and substrate competition (p > 0.05). The results of this present study improve the understanding of the underlying effect of LP inoculation on improving silage quality and facilitate the bio-transformation of cabbage byproduct and rice straw as animal feed.

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Section: The Effects Of Lp Inoculation On Physicochemical Properties Of Silagecontrasting

confidence: 65%

“…The minimum DM (>200 g•kg −1 FM) and WSC content (>50 g•kg −1 DM) were reported necessary as LABs transformed the WSC to organic acid, e.g., LA, to decrease the pH and preserve the forage successfully [9,27]. Thus, the formula of initial materials was suitable in this study.…”

Section: The Effects Of Lp Inoculation On Physicochemical Properties Of Silagementioning

confidence: 95%

Keystone Taxa Lactiplantibacillus and Lacticaseibacillus Directly Improve the Ensiling Performance and Microflora Profile in Co-Ensiling Cabbage Byproduct and Rice Straw

Zhang

Shi

et al. 2021

Microorganisms

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“…Phosphoric acid with different concentrations for the treatment of various feedstocks exhibited a diverse influence on saccharification ( Table 2 ). Furthermore, concentrated sulfuric and nitric acid pretreatments of lignocellulosic biomass are the most important approaches for commercial utilization ( Zhao et al, 2021 ). However, the strong acid treatment not only requires high-energy input, rigorous equipment, and hazardous chemicals but also generates inhibitors and causes environmental pollution (Bukhari et al, 2020).…”

Section: Acid Pretreatmentmentioning

confidence: 99%

Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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Straw biomass is an inexpensive, sustainable, and abundant renewable feedstock for the production of valuable chemicals and biofuels, which can surmount the main drawbacks such as greenhouse gas emission and environmental pollution, aroused from the consumption of fossil fuels. It is rich in organic content but is not sufficient for extensive applications because of its natural recalcitrance. Therefore, suitable pretreatment is a prerequisite for the efficient production of fermentable sugars by enzymatic hydrolysis. Here, we provide an overview of various pretreatment methods to effectively separate the major components such as hemicellulose, cellulose, and lignin and enhance the accessibility and susceptibility of every single component. This review outlines the diverse approaches (e.g., chemical, physical, biological, and combined treatments) for the excellent conversion of straw biomass to fermentable sugars, summarizes the benefits and drawbacks of each pretreatment method, and proposes some investigation prospects for the future pretreatments.

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“…5). In addition,acid or alkali pretreatments can signi cantly improve biomass deligni cation and enhance enzymatic hydrolysis [32,33]. Thus, XynB may be more suitable for degrading pretreated substrates, rather than applying all three…”

Section: Discussionmentioning

confidence: 99%

Degradation Patterns of GH11 xylanases for Efficiently Hydrolyzing xylan in Aspergillus Niger An76

Zhang¹,

Zhang²,

Shang³

et al. 2021

Preprint

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Background: Xylan is the most abundant hemicellulose polysaccharide in nature. Endo-xylanases from GH10 and GH11 families are the most critical xylan degrading enzymes. Filamentous fungi are highly effective xylan degraders and possess numerous xylan degrading isoenzyme-encoding genes, especially Aspergillus niger. Most noteworthy, the amplification of the GH11 xylanase-encoding genes occurs frequently in an organism, but the knowledge of each GH11 xylanases is little known. Results: A. niger An76 encoded a comprehensive set of xylan-degrading enzymes, including five endo-xylanases (one GH10 and four GH11). Quantitative transcriptional analysis showed that three xylanases were up-regulated by xylose substrates, and the order and amount of enzyme secretion differed. Specifically, XynA and XynB were initially secreted successively, followed by XynC. Structural bioinformatics analysis indicated that the different modes of action of the three GH11 xylanases may be due to intricate hydrogen bonding between substrates and functional residues in the active site architectures. Heterologous expression and biochemical characterization of three GH11 xylanases (XynA, XynB and XynD) revealed differences in catalytic performance and product profiles. Furthermore, XynA and XynB displayed obvious synergistic action against beechwood xylan. Conclusions: We investigated subtle differences in the functions of different isoenzymes in the same family using a combination of physiological and biochemical experiments. The transcriptional regulation and catalytic functions of enzymes could be the result of long-term evolutionary adaptation. The finding further expanded our understanding of GH-encoding genes amplification in filamentous fungi, which could guide the design of the optimal enzyme cocktails in industrial applications.

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Enhancement of biomass conservation and enzymatic hydrolysis of rice straw by dilute acid-assisted ensiling pretreatment

Cited by 23 publications

References 42 publications

Keystone Taxa Lactiplantibacillus and Lacticaseibacillus Directly Improve the Ensiling Performance and Microflora Profile in Co-Ensiling Cabbage Byproduct and Rice Straw

Keystone Taxa Lactiplantibacillus and Lacticaseibacillus Directly Improve the Ensiling Performance and Microflora Profile in Co-Ensiling Cabbage Byproduct and Rice Straw

Advances in Pretreatment of Straw Biomass for Sugar Production

Degradation Patterns of GH11 xylanases for Efficiently Hydrolyzing xylan in Aspergillus Niger An76

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