ISOLATION AND IDENTIFICATION OF FUNGI IN A DECAYING CAKE.

Fungi are important microorganisms in food systems because they can act as decomposers, fermenters, and spoilage agents. In food microbiology, moulds and yeasts are among the major organisms responsible for spoilage of many food products, especially carbohydrate-rich foods such as bakery products. Recent reviews show that fungal spoilage remains a major challenge in the food industry because many fungi can survive in low moisture, high sugar, acidic, or oxygen-limited food environments, conditions that are common in processed foods and baked products (Copetti et al., 2023). Cake is one of the most widely consumed bakery products and is produced from ingredients such as flour, sugar, eggs, fat, milk, and flavouring substances. These ingredients provide nutrients that can support microbial growth after production if storage conditions are poor. Although baking destroys most vegetative microbial cells, fungal contamination often occurs after baking through airborne spores, contaminated packaging, utensils, handlers, and storage surfaces. Bakery environments are known to be important sources of post-processing fungal contamination, especially where hygiene and environmental control are inadequate (Diowksz 2023). When cake begins to decay, fungal growth can appear as visible mould colonies, off-odour, discoloration, surface softening, and changes in taste and texture. Such spoilage reduces the shelf life, marketability, and nutritional acceptability of the product. More importantly, some spoilage fungi may produce toxic secondary metabolites known as mycotoxins, which may pose health risks to consumers when contaminated food is eaten. Current literature continues to emphasize that fungal spoilage in foods is not only an economic issue but also a public health concern because of the potential for mycotoxin contamination (Jafarzadeh and Lopes 2023). Common fungi associated with bakery spoilage include species of Aspergillus, Penicillium, Rhizopus, Mucor, and sometimes Candida and Saccharomyces, depending on the product and storage condition. A recent bakery spoilage study reported that Aspergillus spp. and Penicillium spp. were among the dominant mould contaminants in bakery products, while other fungi may also occur depending on product composition and environmental exposure (Diowksz et al., 2024). In addition, recent cake-based studies have confirmed that contaminated cake samples can harbor diverse fungal species capable of causing spoilage and possible toxin-related risks (Bassyouni 2024). The isolation and identification of fungi in decaying cake are therefore essential in microbiology and food safety studies. Such investigation helps to determine the spoilage organisms involved, assess possible public health implications, and provide useful information for improved handling, preservation, packaging, and storage of bakery products. This study is therefore designed to isolate and identify fungi present in a decaying cake sample using standard microbiological methods. Fungi are important microorganisms in food systems because they can act as decomposers, fermenters, and spoilage agents. In food microbiology, moulds and yeasts are among the major organisms responsible for spoilage of many food products, especially carbohydrate-rich foods such as bakery products. Recent reviews show that fungal spoilage remains a major challenge in the food industry because many fungi can survive in low moisture, high sugar, acidic, or oxygen-limited food environments, conditions that are common in processed foods and baked products (Copetti et al., 2023). Cake is one of the most widely consumed bakery products and is produced from ingredients such as flour, sugar, eggs, fat, milk, and flavouring substances. These ingredients provide nutrients that can support microbial growth after production if storage conditions are poor. Although baking destroys most vegetative microbial cells, fungal contamination often occurs after baking through airborne spores, contaminated packaging, utensils, handlers, and storage surfaces. Bakery environments are known to be important sources of post-processing fungal contamination, especially where hygiene and environmental control are inadequate (Diowksz 2023). When cake begins to decay, fungal growth can appear as visible mould colonies, off-odour, discoloration, surface softening, and changes in taste and texture. Such spoilage reduces the shelf life, marketability, and nutritional acceptability of the product. More importantly, some spoilage fungi may produce toxic secondary metabolites known as mycotoxins, which may pose health risks to consumers when contaminated food is eaten. Current literature continues to emphasize that fungal spoilage in foods is not only an economic issue but also a public health concern because of the potential for mycotoxin contamination (Jafarzadeh and Lopes 2023). Common fungi associated with bakery spoilage include species of Aspergillus, Penicillium, Rhizopus, Mucor, and sometimes Candida and Saccharomyces, depending on the product and storage condition. A recent bakery spoilage study reported that Aspergillus spp. and Penicillium spp. were among the dominant mould contaminants in bakery products, while other fungi may also occur depending on product composition and environmental exposure (Diowksz et al., 2024). In addition, recent cake-based studies have confirmed that contaminated cake samples can harbor diverse fungal species capable of causing spoilage and possible toxin-related risks (Bassyouni 2024). The isolation and identification of fungi in decaying cake are therefore essential in microbiology and food safety studies. Such investigation helps to determine the spoilage organisms involved, assess possible public health implications, and provide useful information for improved handling, preservation, packaging, and storage of bakery products. This study is therefore designed to isolate and identify fungi present in a decaying cake sample using standard microbiological methods.