Subscribe Now Subscribe Today
Science Alert
Curve Top
American Journal of Food Technology
  Year: 2011 | Volume: 6 | Issue: 8 | Page No.: 613-630
DOI: 10.3923/ajft.2011.613.630
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Microbial Contamination and Mycotoxins from Nuts in Riyadh, Saudi Arabia

Suaad S. Alwakeel and Laila A. Nasser

The occurrence of harmful aflatoxins from agricultural products varies with geographic location, farming practices and processing. To date, no data was reported from Saudi Arabia on mycotoxin content of nuts and edible seeds. Forty samples of edible nuts and dried seeds were randomly collected from different locations in Al-Riyadh, Saudi Arabia. Fungi were detected by seed-plate and dilutions plate method and were cultured on glucose-Czapek's agar, sucrose-Czapek's agar and starch yeast agar. Purified fungal isolates were identified morphologically. Mycotoxins were extractedusing chloroform and detected by thin layer chromatography. Bacterial analysis was done using total plate count method. There was a predominance of A. niger and A. flavus in all medium types. Aflatoxin B1 (8.5 μg mL-1) was detected in peanuts containing A. flavus. Aflatoxin B1 (1.7 μg mL-1) and B2 (1.7 μg mL-1) was detected in sunflower seeds containing A. terreus. T2 toxin (2.8 mg mL-1) was detected in pumpkinseeds containing Stachybotrys chartarum and DAS (2.4 μg mL-1) was detected in a salted peanut sample containing Trichthecium roseum. Four nut samples showed contamination with bacteria. Turkish pine seeds and American walnut had total plate counts of 12x10. Pakistani pine seeds and Iranian salted pistachio had TPC of 3x10. Listeria monocytogenes was isolated from American walnut samples. Government authorities for food safety consumption should continue to monitor and set appropriate guidelines and information initiatives for public knowledge on the safety of these agricultural products whole year round.
PDF Fulltext XML References Citation Report Citation
  •    Potential for Fumonisin Production by the Strains of Gibberella fujikuroi Species Complex Isolated from Maize Produced in Uganda
  •    The Relationship Between Some Mycotoxins Excretion and Bean Seed Discoloration
  •    Differential Effect of Lipoxygenase on Aflatoxin Production by Aspergillus spp.
  •    Some of Soil Streptomyces Isolates Decrease Toxigenic Capability of Fusarium verticillioides in vitro
  •    Mycoflora and Natural Occurrence of Mycotoxins in Some Meat Products and Livers of Poultry and Imported Bulls
  •    The Effect of Mycotoxins found in some Herbal Plants on Biochemical Parameters in Blood of Female Albino Mice
  •    Quantitative Examination of Aerobic Bacteria and Fungi in Locally Available Antacid Suspension and Possible Contamination by Specified Bacteria
  •    Mesophilic Fungi and Mycotoxins Contamination of Libyanm Cultivated Four Fabaceae Seeds
How to cite this article:

Suaad S. Alwakeel and Laila A. Nasser, 2011. Microbial Contamination and Mycotoxins from Nuts in Riyadh, Saudi Arabia. American Journal of Food Technology, 6: 613-630.

DOI: 10.3923/ajft.2011.613.630






Curve Bottom