Responses of Aspergillus niger to selected environmental factors

Šimonovičová, Alexandra; Nosalj, Sanja; Takáčová, Alžbeta; Martı́n, Tomás; Jesenák, K.; Čerňanský, Slavomír

doi:10.1515/nbec-2017-0013

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…All the A. niger isolates varied in colony size. Greater colony size may be important that cause for A. niger to have greater capacity to produce citric acid [26]. Different in colony size might be due to that A. niger isolates were collected from different isolation sources which contained different media or samples composition [27].…”

Section: Resultsmentioning

confidence: 99%

Isolation of citric acid-producing Aspergillus niger from soil and organic wastes

Zakry

Syahidah

Malahubban

et al. 2020

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Introduction of new Aspergillus niger strains that are more productive than those currently in use is one of the important steps in promoting more effective commercial citric acid production. The present study was conducted to isolate and characterise indigenous A. niger from selected soil and organic wastes such as soil with buried bamboo, soil with bamboo on the surface, soil under cattle grazing, mango orchard soil, rotting plum fruit and rotting bread. Morphological identification of A. niger was based on the length and width of the conidiophores, vesicles, phialides, and spores. Citric acid-producing Aspergillus isolates were screened based on the citric acid production index. The present study found that the highest fungal spore counts (3.35±0.15 x 107 spores/g sample) were obtained from soil under cattle grazing, as were the highest A. niger counts (7.25±0.05 x 106 spores/g sample). The lowest total fungal counts came from rotting plum fruit (4.70±0.10 x 105 spores/g sample). A total of 14 isolates were collected, with five (NSA03, NSA06, NSA09, NSA12, and NSA14) showing morphological similarities with the reference isolate, A. niger Tiegh. All isolates were able to produce citric acid, but with varying efficiencies according to their citric acid production indices. The soil under cattle grazing area found to be the best site for sampling and isolation for citric acid-producing A. niger by using Czapek-Dox as a medium of isolation.

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Section: Resultsmentioning

confidence: 99%

Isolation of citric acid-producing Aspergillus niger from soil and organic wastes

Zakry

Syahidah

Malahubban

et al. 2020

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Removal of aluminium from aqueous solution by four wild-type strains of Aspergillus niger

Boriová

Čerňanský

Matúš

et al. 2018

Bioprocess Biosyst Eng

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Reduction of nickel content from the model solution by consortium of fungal pellets and green algae

Remenarova

Takáčová

Šimonovičová

et al. 2020

IOP Conf. Ser.: Earth Environ. Sci.

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The accumulation of Ni from the model aqueous solution (100 mg/L) by pellets of Aspergillus niger (A. niger) together with the green algae Chlorella sp., as a microbial consortium, during five days was compared. In the experiment, already formed pellets were used (5 mL A. niger conidia in Sabouraud Dextrose Broth, shaked with 200 rpm for 5 days). The experiment was carried out under static and also dynamic conditions at 25 °C. Oxidation-Reduction-Potential (ORP) and pH were measured as well in the first, third and fifth days. Microbial consortium (A. niger with Chlorella sp.) was found always more effective – reduction of the Ni content was higher 48.95 mg/L (under static conditions) and 56.45 mg/L (dynamic conditions), pH values were medium acidic (5.84 static conditions), to weak acid (6.52 dynamic conditions). Monitored ORP values were significantly reduced in the range of -309 mV up to - 385 mV in the Ni model aqueous solution, when the both microorganisms were present. This reduction was attributed to the anoxic conditions occurred when the Reactive Oxygen Species (ROS) radicals were produced by the photoactive pigments in the algae chloroplasts.

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Responses of Aspergillus niger to selected environmental factors

Cited by 5 publications

References 18 publications

Isolation of citric acid-producing Aspergillus niger from soil and organic wastes

Isolation of citric acid-producing Aspergillus niger from soil and organic wastes

Removal of aluminium from aqueous solution by four wild-type strains of Aspergillus niger

Reduction of nickel content from the model solution by consortium of fungal pellets and green algae

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