Influence of solid-state fermentation with Streptomyces on the ability of wheat and barley straws to thicken castor oil for lubricating purposes

Borrero-López, Antonio M.; Blánquez, Alba; Valencia, C.; Hernández, Manuel; Arias, Mauricio; Franco, J.M.

doi:10.1016/j.indcrop.2019.111625

Cited by 19 publications

(23 citation statements)

References 45 publications

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“…Compared to SCMP, the peak intensity of the skeleton structure of the aromatic ring decreased in H-SCMP and F-SCMP, but changed little in E-SCMP, indicating that hydrogen peroxide and Fenton pretreatment can effectively remove lignin from HBMP [ 37 ], the removal of lignin in HBMP by ethanol pretreatment was less. The absorption peak at 1049 cm −1 was assigned to the pyranose, which was decreased after the hydrogen peroxide, Fenton, and ethanol pretreatments, which implied the degradation of the carbohydrates in the fibers.…”

Section: Resultsmentioning

confidence: 99%

Effect of Pretreatments on the Enzymatic Hydrolysis of High-Yield Bamboo Chemo-Mechanical Pulp by Changing the Surface Lignin Content

et al. 2021

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Hydrogen peroxide chemo-mechanical pulp (APMP), sulfonated chemo-mechanical pulp (SCMP), and chemical thermomechanical pulp (CTMP) were used as raw materials to explore the effects of hydrogen peroxide (HP), Fenton pretreatment (FP), and ethanol pretreatment (EP) on the enzymatic hydrolysis of high-yield bamboo mechanical pulp (HBMP). The surface lignin distribution and contents of different HBMPs were determined using confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS). The correlation between the surface lignin and the enzymatic hydrolysis of HBMP was also investigated. The residue of enzymatic hydrolysis was used to adsorb methylene blue (MB). The results showed that the cracks and fine fibers on the surface of APMP, SCMP, and CTMP increased after FP, when compared to HP and EP. The total removal content of hemicellulose and lignin in SCMP after FP was higher than with HP and EP. Compared to SCMP, the crystallinity increased by 15.4%, and the surface lignin content of Fenton-pretreated SCMP decreased by 11.7%. The enzymatic hydrolysis efficiency of HBMP after FP was higher than with HP and EP. The highest enzymatic hydrolysis of Fenton-pretreated SCMP was 49.5%, which was higher than the enzymatic hydrolysis of Fenton-pretreated APMP and CTMP. The removal rate of MB reached 94.7% after the adsorption of the enzymatic hydrolysis residue of SCMP. This work provides an effective approach for a high value-added utilization of high-yield bamboo pulp.

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Section: Resultsmentioning

confidence: 99%

Effect of Pretreatments on the Enzymatic Hydrolysis of High-Yield Bamboo Chemo-Mechanical Pulp by Changing the Surface Lignin Content

et al. 2021

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“…Bio-lubricants samples were obtained from Castor oil added of fermented straw (wheat and barley) with Streptomyces sp., and functionalized with 1,6-Hexamethylene diisocyanate (HMDI) (at a proportion 2:1), as previously reported. In brief, wheat straw and barely straw fermented with Streptomyces were directly blended with HMDI (1/2 cellulose pulp/HMDI weight ratio) and castor oil (85% or 90% w / w ) under stirring at room temperature (~20 °C) for 24 h using an RW20 (IKA, Staufen, Germany) equipped with an anchor impeller at 70 rpm [ 10 , 17 ].…”

Section: Methodsmentioning

confidence: 99%

Assessment of Sustainability of Bio Treated Lignocellulose-Based Oleogels

et al. 2021

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The development of biological strategies to obtain new high-added value biopolymers from lignocellulosic biomass is a current challenge for scientific community. This study evaluates the biodegradability and ecotoxicity of new formulated oleogels obtained from fermented agricultural residues with Streptomyces, previously reported to show improved rheological and tribological characteristics compared to commercial mineral lubricants. Both new oleogels exhibited higher biodegradation rates than the commercial grease. Classical ecotoxicological bioassays using eukaryotic organisms (Lactuca sativa, Caenorhabditis elegans) showed that the toxic impact of the produced bio-lubricants was almost negligible and comparable to the commercial grease for the target organisms. In addition, high throughput molecular techniques using emerging next-generation DNA-sequencing technologies (NGS) were applied to study the structural changes of lubricant-exposed microbial populations of a standard soil. Results obtained showed that disposal of biomass-based lubricants in the soil environment did not substantially modify the structure and phylogenetic composition of the microbiome. These findings point out the feasibility and sustainability, in terms of biodegradability and eco-safety, of the new bio-lubricants in comparison with commercial mineral greases. This technology entails a promising biological strategy to replace fossil and non-renewable raw materials as well as to obtain useful biopolymers from agricultural residues with potential for large-scale applications.

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“…The first one finds its optimum working temperature at 28 • C, while the latter is considered a thermophilic strain, reaching an optimum activity at 45 • C. MDG301 activity was tested at 45 • C on both wheat and barley straws (samples CPW301.45 and CPB301.45) and 28 • C on wheat straw (sample CPW301), whereas MDG147 activity was evaluated only on barley straw (CPB147). More detailed information about preinoculum acquisition, SSF process, and enzymatic activity monitoring system can be found elsewhere [39]. Uninoculated samples followed a similar treatment for further comparison.…”

Section: Solid-state Fermentationmentioning

confidence: 99%

Cellulose Pulp- and Castor Oil-Based Polyurethanes for Lubricating Applications: Influence of Streptomyces Action on Barley and Wheat Straws

et al. 2020

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The replacement of mineral oils and non-renewable gelling agents is an imperative requirement for the lubricant industry in the near future. In this framework, cellulose pulp and castor oil are proposed as sustainable substitutes for these components. Biological treatment has been explored and evaluated to enhance the dispersing and thickening properties of cellulose pulp in oil media. Streptomyces sp. MDG147 and MDG301 strains were employed to modify agricultural wheat and barley straw residues from which cellulose pulp was obtained afterwards. In addition, an environmentally friendly process for the production of cellulose-pulp-/castor-oil-based polyurethanes was applied, in which neither catalysts nor harmful solvents were used, resulting in chemical oleogels. These oleogels were rheologically and tribologically characterized to evaluate their performance as lubricating greases. The enzymatic activity pattern developed was dependent on the raw material, the strain type, and the temperature, influencing the cellulose pulp’s composition, polymerization degree, and crystallinity. These modified characteristics tuned the rheological behavior of the different oleogels, providing a beneficial range of viscoelastic responses and viscosity values that were generally favored by the Streptomyces action. Furthermore, the friction coefficient and dimensions of wear scars measured in a tribological contact were comparable to, or even lower than, those found with commercial and other bio-based lubricating greases that have previously been studied.

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Influence of solid-state fermentation with Streptomyces on the ability of wheat and barley straws to thicken castor oil for lubricating purposes

Cited by 19 publications

References 45 publications

Effect of Pretreatments on the Enzymatic Hydrolysis of High-Yield Bamboo Chemo-Mechanical Pulp by Changing the Surface Lignin Content

Effect of Pretreatments on the Enzymatic Hydrolysis of High-Yield Bamboo Chemo-Mechanical Pulp by Changing the Surface Lignin Content

Assessment of Sustainability of Bio Treated Lignocellulose-Based Oleogels

Cellulose Pulp- and Castor Oil-Based Polyurethanes for Lubricating Applications: Influence of Streptomyces Action on Barley and Wheat Straws

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