Identification of Aspergillus flavus and aflatoxins contamination in inflorescences of wild grasses in Iran

2017 ◽  
Vol 6 (1) ◽  
pp. 35-44
Author(s):  
Khosrow Chehri ◽  
◽  
Seyyed Meqdad Hasani ◽  
Keyword(s):  
Aspergillus Flavus

Systemic aspergillosis caused by an aflatoxin-producing strain of Aspergillus flavus

1998 ◽  
Vol 36 (2) ◽  
pp. 107-112 ◽  
Author(s):  
T. MORI ◽  
M. MATSUMURA ◽  
K. YAMADA ◽  
S. IRIE ◽  
K. OSHIMI ◽  
...  
Keyword(s):  
Aspergillus Flavus

Identificação de Espécies de Aspergillus e Potencial Toxígeno de Aspergillus flavus Isolados de Rações Comerciais

2014 ◽  
Vol 16 (2) ◽  
pp. 131-136
Author(s):  
V.C. Alves ◽  
F.C. Cardoso Filho ◽  
M.M.G. Pereira ◽  
A.P.R. Costa ◽  
M.C.S. Muratori
Keyword(s):  
Aspergillus Flavus

Synthesis, photosensitization and antimicrobial activity evaluation of some novel Merocyanine dyes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Aspergillus Flavus ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Fungal Strains ◽  
Activity Evaluation ◽  
Visible Spectra ◽  
Merocyanine Dyes

Novel acyclic and cyclic merocyanine dyes derived from the nucleu of furo [(3,2-d) pyrazole; ( d 2 , 3 )imidazole]were prepared. The electronic visible absorptionspectra of all the synthesized new cyanine dyes were examined in 95% ethanolsolution to evaluate their photosensitization properties. Antibacterial andantifungal activities for some selected dyes were tested against various bacterialand fungal strains (Escherichia coli, Staphylococcus aureus, Aspergillus flavus andCandida albicans) to evaluate their antimicrobial activity. Structural identificationwas carried out via elemental analysis, visible spectra, IR and 1H NMRspectroscopic data.

Chemical Composition and Active Properties Evaluation of Wild Oregano (Origanum Vulgare) and Ginger (Zingiber Officinale-Roscoe) Essential Oils

2018 ◽  
Vol 69 (8) ◽  
pp. 1927-1933 ◽  
Author(s):  
Mariana Deleanu ◽  
Elisabeta E. Popa ◽  
Mona E. Popa
Keyword(s):  
Essential Oil ◽  
Growth Inhibition ◽  
Gallic Acid ◽  
Aspergillus Flavus ◽  
Zingiber Officinale ◽  
Penicillium Expansum ◽  
Origanum Vulgare ◽  
Zingiber Officinale Roscoe ◽  
Oregano Oil ◽  
Gallic Acid Equivalent

The compounds in Ginger (Zingiber officinale-Roscoe) essential oil provenience China and wild oregano (Origanum vulgare) essential oil of Romanian origin were identified by GC/MS and their antioxidant and antifungal properties were evaluated. Wild oregano oil was characterized by high content of oxygenated monoterpenes hydrocarbons (84.05%) of which carvacrol was the most abundant (73.85%) followed by b-linalool (3.46%) and thymol (2.29%). Ginger oil had a higher content of sesquiterpene hydrocarbons including zingiberene (31.47%), b-sesquiphellandrene (13.76%), a-curcumene (10.41%), a-farnesene (8.31%) and b-bisabolene (7.55%) but a lower content of oxygenated monoterpenes (7.97%). The high content of oxygenated monoterpens of wild oregano oil is in accordance with total content of polyphenols determined by the Folin�Ciocalteu method (6.71�0.73 mg of gallic acid equivalent per g oil). Ginger oil had only 1.34�0.22 mg gallic acid equivalent per g oil. Wild oregano oils exhibited appreciable in vitro antioxidant activity as assessed by 2, 2`-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and 2,2�-azino-bis (3 ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS). The sample concentration required to scavenge 50% of the DPPH free radicals was 0.76�0.13 mg/mL for wild oregano oil compared to 20.22�2.12 mg/mL for ginger oil. Also, wild oregano oils showed significant inhibitory activity against selected pathogenic fungi (Fusarium oxysporum, Aspergillus flavus and Penicillium expansum). 1�L of oregano oil is sufficient for almost 75% growth inhibition of Aspergillus flavus compared to ginger oil which shows antifungal activity at 240�L for 78% growth inhibition. It can be concluded that wild oregano oil could be used as food preservative in some food products in which Fusarium oxysporum, Aspergillus flavus and Penicillium expansum could grow and have potential to produce health hazards mycotoxines.

Микромицеты Aspergillus flavus и A. oryzae как продуценты протеиназ – активаторов белков системы гемостаза человека

2019 ◽  
Vol 53 (3) ◽  
pp. 183-185 ◽  
Author(s):  
А. А. Осмоловский ◽  
В. Г. Крейер ◽  
А. В. Кураков ◽  
Н. А. Баранова ◽  
Н. Ф. Пискункова ◽  
...  
Keyword(s):  
Aspergillus Flavus

Properties of extracellular α-mannosidase from Aspergillus flavus LINK 69

1978 ◽  
Vol 43 (10) ◽  
pp. 2812-2816 ◽  
Author(s):  
Jozef Augustín ◽  
Dobroslav Šikl ◽  
Jiří Zemek
Keyword(s):  
Aspergillus Flavus

scholarly journals Mimosa tenuiflora Aqueous Extract: Role of Condensed Tannins in Anti-Aflatoxin B1 Activity in Aspergillus flavus

Toxins ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 391
Author(s):  
Christopher Hernandez ◽  
Laura Cadenillas ◽  
Anwar El Maghubi ◽  
Isaura Caceres ◽  
Vanessa Durrieu ◽  
...  
Keyword(s):  
Aspergillus Flavus ◽  
Aqueous Extract ◽  
Aflatoxin B1 ◽  
Condensed Tannins ◽  
Fungal Growth ◽  
Oxidation Reactions ◽  
Expression Of Genes ◽  
Dependent Inhibition ◽  
Interesting Candidate ◽  
Mimosa Tenuiflora

Aflatoxin B1 (AFB1) is a potent carcinogenic mycotoxin that contaminates numerous crops pre- and post-harvest. To protect foods and feeds from such toxins without resorting to pesticides, the use of plant extracts has been increasingly studied. The most interesting candidate plants are those with strong antioxidative activity because oxidation reactions may interfere with AFB1 production. The present study investigates how an aqueous extract of Mimosa tenuiflora bark affects both the growth of Aspergillus flavus and AFB1 production. The results reveal a dose-dependent inhibition of toxin synthesis with no impact on fungal growth. AFB1 inhibition is related to a down-modulation of the cluster genes of the biosynthetic pathway and especially to the two internal regulators aflR and aflS. Its strong anti-oxidative activity also allows the aqueous extract to modulate the expression of genes involved in fungal oxidative-stress response, such as msnA, mtfA, atfA, or sod1. Finally, a bio-guided fractionation of the aqueous extract demonstrates that condensed tannins play a major role in the anti-aflatoxin activity of Mimosa tenuiflora bark.

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