Significance of Aspergillus niger aggregate species as contaminants of food products in Spain regarding their occurrence and their ability to produce mycotoxins.

Significance of Aspergillus niger aggregate species as contaminants of food products in Spain regarding their occurrence and their ability to produce mycotoxins. Food Microbiol. 2019 Sep;82:240-248 Authors: Gil-Serna J, García-Díaz M, Vázquez C, González-Jaén MT, Patiño B Abstract The Aspergillus niger aggregate contains 15 morphologically indistinguishable species which presence is related to ochratoxin A (OTA) and fumonisin B2 (FB2) contamination of foodstuffs. The taxonomy of this group was recently reevaluated and there is a need of new studies regarding the risk that these species might pose to food security. 258 isolates of A. niger aggregate obtained from a variety of products from Spain were classified by molecular methods being A. tubingensis the most frequently occurring (67.5%) followed by A. welwitschiae (19.4%) and A. niger (11.7%). Their potential ability to produce mycotoxins was evaluated by PCR protocols which allow a rapid detection of OTA and FB2 biosynthetic genes in their genomes. OTA production is not widespread in A. niger aggregate since only 17% of A. niger and 6% of A. welwitschiae isolates presented the complete biosynthetic cluster whereas the lack of the cluster was confirmed in all A. tubingensis isolates. On the other hand, A. niger and A. welwitschiae seem to be important FB2 producers with 97% and 29% of the isolates, respectively, presenting the complete cluster. The genes involv...
Source: Food Microbiology - Category: Food Science Authors: Tags: Food Microbiol Source Type: research

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Publication date: Available online 20 August 2019Source: LWTAuthor(s): R. Becerril, S. Manso, C. NerínAbstractThe influence of the growth of Aspergillus flavus and Escherichia coli on the concentration of the main compounds released by essential oils of cinnamon, clove and oregano has been studied. A diffusion vapour test and a subsequent analysis of three different areas of the plate were carried out. The results showed that in absence of microorganisms a gradient of concentration from the centre towards the periphery of the plate was observed for eugenol, carvacrol and cinnamaldehyde but not for thymol or linalool...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
Publication date: Available online 7 August 2019Source: Food ControlAuthor(s): Mohamed F. Abdallah, Kris Audenaert, Leonie Lust, Sofie Landschoot, Boris Bekaert, Geert Heasaert, Marthe De Boevre, Sarah De SaegerAbstractSugarcane juice is a traditional drink consumed on a daily basis in Egypt. The current work was conducted to (1) evaluate the multi-mycotoxin contamination in sugarcane juice, (2) identify the profiles of the mycotoxigenic fungi, and (3) assess the risk of mycotoxin exposure among the adult population. Sugarcane juice samples (n = 89) were randomly collected in two seasons from Egypt. Quantification of 1...
Source: Food Control - Category: Food Science Source Type: research
Publication date: Available online 19 August 2019Source: Biological ControlAuthor(s): Ashraf S. A. El-Sayed, Gul Shad AliAbstractPhytophthora spp are one of the most devastating pathogens to a wide range of crop plants. Chemical fungicides are commonly used for controlling Phytophthora diseases, however, due to environmental concerns and development of fungicide resistant Phytophthora strains, alternative low-risk method such as biological controls are the prospective approaches. In an in vitro bioactivity-driven screen of rhizosphere-inhabiting fungi, Aspergillus flavipes was identified as a strong inhibitor for growth of...
Source: Biological Control - Category: Biology Source Type: research
Publication date: Available online 16 August 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Chao Zhang, Siyao Liu, Shuangxi Li, Yue Tao, Panpan Wang, Xinyue Ma, Lanzhou ChenAbstractThe magnetic chitosan microspheres immobilized Aspergillus sydowii (MCMAs) was prepared and characterized by SEM, BET, XRD and VSM analyses, and used to adsorb Cu(II) from aqueous solution under different influence factors such as contact time, initial Cu(II) concentration and biosorbent dose. Characterization results showed that MCMAs had large specific surface area and were rapidly separated from aqueous...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
Fungal plant pathogens cause considerable losses in yield and quality of field crops worldwide. In addition, under specific environmental conditions, many fungi, including such as some Fusarium and Aspergillus spp., are further able to produce mycotoxins while colonizing their host, which accumulate in human and animal tissues, posing a serious threat to consumer health. Extensive use of azole fungicides in crop protection stimulated the emergence of acquired azole resistance in some plant and human fungal pathogens. Combination treatments, which become popular in clinical practice, offer an alternative strategy for managi...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
In this study, the orthologs of VosA and VelB, AoVosA and AoVelB, respectively, were characterized in the nematode-trapping fungus Arthrobotrys oligospora, which captures nematodes by producing trapping devices (traps). Deletion of the AovelB gene resulted in growth defects in different media, and the aerial hyphae from the ΔAovelB mutant lines were fewer in number and their colonies were less dense than those from the wild-type (WT) strain. The ΔAovelB mutants each displayed serious sporulation defects, and the transcripts of several sporulation-related genes (e.g., abaA, flbC, rodA, and vosA) were significant...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Publication date: Available online 19 August 2019Source: Food ChemistryAuthor(s): Xiaomin Li, Xizhu Xie, Jun Liu, Dianhui Wu, Guolin Cai, Jian LuAbstractDuring the mashing process for brewing beer, incomplete degradation of arabinoxylan in barley malt may cause an intense filterability problem. The present study cloned a putative arabinofuranosidase (AnAbf), one of the debranching enzymes, from Aspergillus niger, to explore its application for improving filterability. Recombinant AnAbf (rAnAbf) showed activity towards both synthetic and natural substrates, such as 4-nitrophenyl α-L-arabinofuranoside (pNPαAraf) ...
Source: Food Chemistry - Category: Food Science Source Type: research
Halogenated boroxine dipotassium trioxohydroxytetrafluorotriborate K2[B3O3F4OH] inhibits emerging multidrug-resistant and β-lactamase-producing opportunistic pathogens. Drug Dev Ind Pharm. 2019 Aug 16;:1-21 Authors: Maravić A, Rončević T, Krce L, Ilić N, Galić B, Čikeš Čulić V, Carev I Abstract Halogenated boroxine dipotassium trioxohydroxytetrafluorotriborate, K2[B3O3F4OH] (boroxine) was previously shown to be very effective in inhibition of several carcinoma cell lines, including the skin cancer. Here, we investigated its antimicrobial potential by targeting the multidrug-resistan...
Source: Drug Development and Industrial Pharmacy - Category: Drugs & Pharmacology Tags: Drug Dev Ind Pharm Source Type: research
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Source: The Aspergillus Website - updates - Category: Respiratory Medicine Authors: Source Type: news
Conference abstracts
Source: The Aspergillus Website - updates - Category: Respiratory Medicine Authors: Source Type: news
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