Aspergillus section Nigri species isolated from different wine-grape growing regions in Argentina

被引:42
|
作者
Chiotta, M. L. [1 ]
Ponsone, M. L. [1 ]
Combina, M. [2 ]
Torres, A. M. [1 ]
Chulze, S. N. [1 ]
机构
[1] Univ Nacl Rio Cuarto, Dept Microbiol & Inmunol, Fac Ciencias Exactas Fis Quim & Nat, Cordoba, Argentina
[2] INTA, Mendoza, Argentina
关键词
Aspergillus section Nigri; Ochratoxin A; Grapes; OCHRATOXIN-A PRODUCTION; WATER ACTIVITY; CARBONARIUS; GROWTH; TEMPERATURE; FUNGI; STRAINS; RISK; VARIETIES; PRODUCERS;
D O I
10.1016/j.ijfoodmicro.2009.08.013
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Vineyards located in eight grape growing regions of Argentina during the harvest season 2006/07 were evaluated. The aims of this study were to determine the incidence of Aspergillus section Nigri, their ability to produce ochratoxin A (OTA) and to evaluate the OTA natural occurrence in grapes. Bunches of grapes at maturation stage were collected, and grapes (50 per sample) were plated on Petri dishes containing dichloran-glycerol 18% agar (DG18) and dichloran-rose bengal-chloramphenicol agar (DRBC) media. After an incubation period of 7 days at 25 degrees C, the mycoflora belonging to Aspergillus section Nigri was identified. OTA occurrence and the toxicogenic ability of the strains were analyzed by HPLC. A. niger aggregate strains were dominant showing the highest infection percentage (81%), followed by A. carbonarius (11%) and Aspergillus uniseriate (8%). A. carbonarius strains presented the highest percentage of OTA-producer strains (82%) and the highest toxin levels (mean 202 ng/g). A positive correlation between the isolation percentage of A. carbonarius in grapes and temperature was found. The warmest regions showed the highest A. carbonarius incidence. OTA was detected at low levels in grapes during the survey. OTA levels in grapes and rain at harvest time correlated positively. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:137 / 141
页数:5
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