Aspergillus niger

Aspergillus niger
Aspergillus niger is a fungus and one of
the most common species of the genus
Aspergillus.

1. Aspergillus niger Aspergillus niger is a fungus and one of the most common species of the genus Aspergillus .

2. It causes a disease called "black mold" on certain fruits and vegetables such as grapes, apricots, onions, and peanuts, and is a common contaminant of food. It is ubiquitous in soil and is commonly reported from indoor environments, where its black colonies can be confused with those of Stachybotrys (species of Rhopalocystis nigra ( Tiegh .) Grove Sterigmatocystis nigra ( Tiegh .) which have also been called "black mold").

3. Some strains of A. niger have been reported to produce potent mycotoxins called ochratoxins ; [2] other sources disagree, claiming this report is based upon misidentification of the fungal species. Recent evidence suggests some true A. niger strains do produce ochratoxin A. [1][3] It also produces the isoflavone orobol .

4. Plant disease Pathogenicity … Aspergillus niger causes black mold of onions and ornamental plants. Infection of onion seedlings by A. niger can become systemic, manifesting only when conditions are conducive. A. niger causes a common postharvest disease of onions, in which the black conidia can be observed between the scales of the bulb. The fungus also causes disease in peanuts and in grapes.

5. Human and animal disease A. niger gr owing on onion … Aspergillus niger is less likely to cause human disease than some other Aspergillus species. In extremely rare instances, humans may become ill, but this is due to a serious lung disease, aspergillosis , that can occur. Aspergillosis is, in particular, frequent among horticultural workers who inhale peat dust, which can be rich in Aspergillus spores. The fungus has also been found in the mummies of ancient Egyptian tombs and can be inhaled when they are disturbed

6. A. niger is one of the most common causes of otomycosis (fungal ear infections), which can cause pain, temporary hearing loss, and, only in severe cases, damage to the ear canal and tympanic membrane. A. niger

7. Cultivation A. niger has been cultivated both on Czapek medium plates and malt extract agar oxoid (MEAOX) plates A. niger growing on a Czapek medium plate

8. A. niger growing on a MEAOX plate

9. Aspergillus niger is cultured for the industrial production of many substances. [8] Various strains of A. niger are used in the industrial preparation of citric acid (E330) and gluconic acid (E574), and have been assessed as acceptable for daily intake by the World Health Organization.[9] A. niger fermentation is "generally recognized as safe" (GRAS) by the United States Food and Drug Administration under the Federal Food, Drug, and Cosmetic Act.[10] Many useful enzymes are produced using industrial fermentation of A. niger .[11] For example, A. niger glucoamylase (P69328) is used in the

10. production of high-fructose corn syrup, and pectinases (GH28) are used in cider and wine clarification. Alphagalactosidase (GH27), an enzyme that breaks down certain complex sugars, is a component of Beano and other products that decrease flatulence.[12] Another use for A. niger within the biotechnology industry is in the production of magnetic isotope-containing variants of biological macromolecules for NMR analysis.[13] Aspergillus niger is also cultured for the extraction of the enzyme, glucose