Maximization of organic acids production by  Aspergillus niger  in a bubble column bioreactor for V and Ni recovery enhancement from power plant residual ash in spent-medium bioleaching experiments

Rasoulnia, Payam; Mousavi, Seyyed Mohammad

doi:10.1016/j.biortech.2016.05.114

Cited by 66 publications

(27 citation statements)

References 29 publications

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“…The most important is citric acid, the main acidulant used in food and beverage industries. In addition to its importance in pharmaceutical and cosmetics industries, A. niger has been explored to produce organic acids such as gluconic and fumaric acids [19, 20]. In relation to enzymes, A. niger is employed to produce pectinases, amylases and proteases, which are used in a variety of industrial processes, including juice clarification and detergent formulations [21–23].…”

Section: Introductionmentioning

confidence: 99%

Comparative transcriptome analysis reveals different strategies for degradation of steam-exploded sugarcane bagasse by Aspergillus niger and Trichoderma reesei

et al. 2017

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BackgroundSecond generation (2G) ethanol is produced by breaking down lignocellulosic biomass into fermentable sugars. In Brazil, sugarcane bagasse has been proposed as the lignocellulosic residue for this biofuel production. The enzymatic cocktails for the degradation of biomass-derived polysaccharides are mostly produced by fungi, such as Aspergillus niger and Trichoderma reesei. However, it is not yet fully understood how these microorganisms degrade plant biomass. In order to identify transcriptomic changes during steam-exploded bagasse (SEB) breakdown, we conducted a RNA-seq comparative transcriptome profiling of both fungi growing on SEB as carbon source.ResultsParticular attention was focused on CAZymes, sugar transporters, transcription factors (TFs) and other proteins related to lignocellulose degradation. Although genes coding for the main enzymes involved in biomass deconstruction were expressed by both fungal strains since the beginning of the growth in SEB, significant differences were found in their expression profiles. The expression of these enzymes is mainly regulated at the transcription level, and A. niger and T. reesei also showed differences in TFs content and in their expression. Several sugar transporters that were induced in both fungal strains could be new players on biomass degradation besides their role in sugar uptake. Interestingly, our findings revealed that in both strains several genes that code for proteins of unknown function and pro-oxidant, antioxidant, and detoxification enzymes were induced during growth in SEB as carbon source, but their specific roles on lignocellulose degradation remain to be elucidated.ConclusionsThis is the first report of a time-course experiment monitoring the degradation of pretreated bagasse by two important fungi using the RNA-seq technology. It was possible to identify a set of genes that might be applied in several biotechnology fields. The data suggest that these two microorganisms employ different strategies for biomass breakdown. This knowledge can be exploited for the rational design of enzymatic cocktails and 2G ethanol production improvement.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-017-3857-5) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Comparative transcriptome analysis reveals different strategies for degradation of steam-exploded sugarcane bagasse by Aspergillus niger and Trichoderma reesei

et al. 2017

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“…Grewal and Kalra [44] also showed that when the medium pH was raised (above 4) in the early stage of fermentation, mainly oxalic acid was formed in the medium. Rasoulnia and Mousavi [49] detected that the citric acid progressively was produced from the fourth day onwards. At lower pH, citric acid was noted as main organic acid through the fermentation.…”

Section: Lab-scale Bioreactor Testsmentioning

confidence: 99%

“…The concentration of oxalic acid decreases due to its consumption in citric acid production [47,48]. Malic acid production gradually increased in the fermentation medium however it was so much lower in comparison to the other organic acids including citric, gluconic and oxalic acid [49].…”

Section: Lab-scale Bioreactor Testsmentioning

confidence: 99%

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Biocatalytic and chemical leaching of a low-grade nickel laterite ore

Çiftçi

Atik

Gürbüz

2018

Metall. Res. Technol.

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Nickel and cobalt recovery from a low-grade nickel laterite ore, supplied from Çaldag deposit (Manisa, Turkey) were investigated by bio and chemical leaching processes. The fungus, Aspergillus niger was used for biocatalytic leaching experiments. The effects of parameters (solid ratio and sucrose concentration) on the biocatalytic leaching of the ore were initially tested in flasks to obtain the optimum conditions for the A. niger. Then chemical leaching was applied as a comparison to bioleaching, using organic acids (citric, oxalic, acetic and gluconic acids) as well as a mixture of acids. According the results, the maximum dissolution yield of nickel, cobalt and iron were detected respectively as 95.3%, 74.3% and 50.0% by biocatalytic processes which containing 25% (w/v) sucrose and 1% (w/v) solids. The increase in the solid ratio adversely influenced the biocatalytic activity of A. niger. Finally, further tests in reactors (v = 1 and 10 L) were performed using the optimum conditions from the flask tests. The difference in metals recovery between biocatalytic and chemical leaching was significantly important. Bioleaching produced higher Ni and Co extractions (34.3-75.6%) than chemical process.

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“…Tariq M. Bhatti et al [20,21] investigated the structural alteration of phlogopite and biotite (K(Mg,Fe 2+ ) 3 AlSi 3 O 10 (OH,F) 2 ) during weathering by A. ferrooxidans, finding that both minerals were partly altered to vermiculite when ferrous sulfate was added as an energy source because the formation of jaroite caused selective loss of K + from interlayer positions of minerals, and no structural alterations were detected when adding sulfur as the energy source. The studies about bioleaching of vanadium are focused on the recovery of vanadium from industrial wastes such as spent catalysts and slag fly ash, in which vanadium exists as oxides, and considerable vanadium recovery (80%-100%) was obtained when bioleaching of these wastes by A. ferrooxidans [22][23][24] occurred. Mei-xia Liao et al [25] studied bioleaching of vanadium from stone coal using A. ferrooxidans, and vanadium extraction of 69% was obtained in 25 days.…”

Section: Introductionmentioning

confidence: 99%

Vanadium Bioleaching Behavior by Acidithiobacillus ferrooxidans from a Vanadium-Bearing Shale

et al. 2018

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This study investigated bioleaching behavior of vanadium from a vanadium-bearing shale using Acidithiobacillus ferrooxidans (A. ferrooxidans). Results showed a maximum recovery of 62% vanadium in 1.2-day bioleaching, which was 22.45% higher than the controls. Then, the vanadium leaching efficiency decreased significantly, only 24% of that was obtained on the tenth day. The vanadium extraction in 1.2 days was mainly attributed to the dissolution of vanadium in free oxides of shale. Fe 3+ produced by A. ferrooxidans promoted the dissolution process. X-ray diffraction (XRD) patterns of the leached residues confirmed the generation of jarosite. SEM-EDS analysis of the residues indicated that jarosite adsorbed on the shale and inhibited the further dissolution of vanadium. The relevance of V, Fe, S, O was quite good in the energy disperse X-ray spectrometry (EDS) element mapping of jarosite, and acid-washing of the jarosite resulted in 31.6% of the vanadium in the precipitates desorption, indicating that the decrease of vanadium leaching efficiency in bioleaching process was caused by both adsorption and co-precipitation with jarosite.

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Maximization of organic acids production by Aspergillus niger in a bubble column bioreactor for V and Ni recovery enhancement from power plant residual ash in spent-medium bioleaching experiments

Cited by 66 publications

References 29 publications

Comparative transcriptome analysis reveals different strategies for degradation of steam-exploded sugarcane bagasse by Aspergillus niger and Trichoderma reesei

Comparative transcriptome analysis reveals different strategies for degradation of steam-exploded sugarcane bagasse by Aspergillus niger and Trichoderma reesei

Biocatalytic and chemical leaching of a low-grade nickel laterite ore

Vanadium Bioleaching Behavior by Acidithiobacillus ferrooxidans from a Vanadium-Bearing Shale

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