Web of Science: 10 citas, Scopus: 11 citas, Google Scholar: citas
Impact of some environmental factors on growth and ochratoxin A production by Aspergillus niger and Aspergillus welwitschiae
Abarca Salat, Ma. Lourdes (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Bragulat, M. Rosa (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Castellà Gómez, Gemma (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Cabañes Sáenz, Francisco Javier (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)

Fecha: 2019
Resumen: Ochratoxin A (OTA) is a nephrotoxic mycotoxin which may contaminate various foods and feed products worldwide. Aspergillus niger is one of the species responsible for OTA contamination in grapes and derived products. This species has recently been split into A. niger and Aspergillus welwitschiae. Both species can not be distinguished by phenotypic or extrolite profiles and to date there is no ecophysiological information of A. welwitschiae. The aim of this study was to determine the effects of water activity (aw) (0. 90; 0. 95 and 0. 98-0. 99), culture media (Yeast Extract Sucrose Broth (YESB); Synthetic Grape Juice Medium (SGM); White grape juice (WGJ)) and temperature (15 °C, 25 °C and 35 °C) on the growth and OTA production of four strains of A. niger and six strains of A. welwitschiae. The assay was performed in microtiter plates, determining the absorbance at 530 nm and the concentration of OTA at 1, 2, 4 and 10 days. No significant differences were observed in absorbance and OTA values between the two species under study. The highest absorbance values were recorded in YESB, followed by SGM and WGJ. Absorbance values increased with increasing aw and temperature. The highest OTA values were obtained at 0. 98-0. 99 aw and the best culture media for OTA production was YESB, followed by WGJ and SGM. The studied strains of A. niger produced the highest mean OTA level at 25 °C whereas A. welwitschiae strains produced the highest mean OTA concentration at 15 °C, although not differing significantly from concentration produced at 25 °C. To our knowledge, this is the first report on the impact of some environmental factors on growth and OTA production by A. welwitschiae.
Nota: Número d'acord de subvenció MICINN/AGL2014-52516-R
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Lengua: Anglès
Documento: article ; recerca ; Versió acceptada per publicar
Materia: Microbiologia ; Aspergillus niger ; Aspergillus welwitschiae ; Ecophysiology ; Grapes ; Ochratoxin A ; Raisins
Publicado en: International journal of food microbiology, Vol. 291 (february 2019) , p. 10

DOI: 10.1016/j.ijfoodmicro.2018.11.001
PMID: 30419474

30 p, 365.8 KB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias de la salud y biociencias > Grupo de Micología Veterinaria
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 Registro creado el 2018-11-12, última modificación el 2021-06-13

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