ASSESSMENT OF MYCOLOGICAL CONTAMINANTS ASSOCIATED WITH CANNED TOMATOES SOLD IN CENTRAL MARKET KATSINA

Abstract

Canned tomatoes are widely consumed globally for their convenience and nutritional value. However, concerns have emerged regarding their safety due to potential fungal contamination, which can lead to the production of harmful mycotoxins, such as aflatoxins and ochratoxins. This study aimed to assess the mycological contaminants associated with canned tomatoes sold in Central Market, Katsina, with a focus on identifying fungal species and quantifying contamination levels. A total of 20 canned tomato samples were collected from different brands available in Katsina Central Market. Fungal contamination was quantified by measuring fungal colony-forming units (CFU) per gram using the pour plate method on Potato Dextrose Agar (PDA). The isolated fungi were identified based on macroscopic and microscopic characteristics using Atlas of clinical fungi. The fungi were identified by their colony growth pattern, conidial morphology, and pigmentation. The fungal colony counts (CFU/g) varied across the different brands, with Brand A having the lowest contamination (3 CFU/g), followed by Brand B (4 CFU/g), Brand D (15 CFU/g), Brand E with (22 CFU/g), and Brand C exhibiting the highest contamination (36 CFU/g). The fungal isolates consisted predominantly of Aspergillus niger (57%) and Saccharomyces cerevisiae (43%). Aspergillus niger was found to be the most prevalent specie, suggesting that environmental factors such as humidity or improper storage conditions favored its growth. Saccharomyces cerevisiae was also present but at a lower frequency, indicating potential issues with fermentation or storage practices. Others include Aspergillus flavus and Mucor spp. The study found high prevalence of fungal contamination, particularly in Brands C and E, The results emphasizes the need for improved food safety practices, including proper packaging, improved storage conditions and handling techniques to minimize fungal contamination and the associated health risks. Further research is recommended to investigate the presence of mycotoxins and their potential impact on public health in the state.

Keywords: Canned tomatoes, fungal contamination, A. niger, Saccaromyces cerevsiae