Dada Toluwase Adeseye, Ekwomadu Theodora Ijeoma, Ngoma Lubanza, Mwanza Mulunda
Department of Animal Health, Faculty of Natural and Agricultural Sciences, Mafikeng Campus, North-West University, Private Bag X2046, Mmabatho 2735, Mafikeng, South Africa.
Department of Agricultural Technology, School of Agriculture, Ekiti State Polytechnic, Isan-Ekiti PMB 1101, Nigeria.
Foods. 2024 Oct 10;13(20):3221. doi: 10.3390/foods13203221.
This study aimed to examine fungi diversity in dried beef meat sold in Ekiti State, characterize the isolated fungi, and determine the aflatoxin-producing ability of the fungi in the samples. Dried beef meat was collected from different markets in Ekiti State and screened for the presence of filamentous fungi using molecular methods. Samples were cultured aseptically on potato dextrose agar (PDA) for fungi isolation, and molecular identification was performed using DNA extraction, Polymerase chain Reaction (PCR), ITS-1/ITS-4 primer pair, and nucleotide sequencing. The results obtained indicated a range of filamentous fungi genera including , , , , , , and other fungi species contaminating the dried meat at (43%), (42%), (3%), (2%), (2%), (1%), and (7%), respectively. High incidences were recorded for , , and in most of the screened samples. accounted for (24.7%) of all the species isolated with the presence of the gene needed for aflatoxin production. The occurrences of these filamentous fungal species pose a cause for concern, as most of these fungal species are known producers of certain toxic substances. Maximum likelihood phylogenetic analysis showed a high similarity index score, which indicated a good relationship between isolated Species and the closely related strains from GenBank, isolated from different sources and countries. The implication of this study is that consumer health may be at risk through exposure to contaminated dried meat.
本研究旨在检测埃基蒂州销售的牛肉干中的真菌多样性,鉴定分离出的真菌,并确定样品中真菌产生黄曲霉毒素的能力。从埃基蒂州不同市场收集牛肉干,采用分子方法筛选丝状真菌的存在情况。将样品无菌接种在马铃薯葡萄糖琼脂(PDA)上进行真菌分离,通过DNA提取、聚合酶链反应(PCR)、ITS-1/ITS-4引物对和核苷酸测序进行分子鉴定。结果表明,一系列丝状真菌属,包括曲霉属、青霉属、枝孢属、镰刀菌属、链格孢属、毛霉属和其他真菌物种分别以43%、42%、3%、2%、2%、1%和7%的比例污染了牛肉干。在大多数筛选样品中,曲霉属、青霉属和枝孢属的发生率较高。黄曲霉在所有分离出的曲霉属物种中占24.7%,且存在产生黄曲霉毒素所需的基因。这些丝状真菌物种的出现令人担忧,因为这些真菌中的大多数是已知的某些有毒物质的生产者。最大似然系统发育分析显示出较高的相似性指数得分,这表明分离出的曲霉属物种与来自GenBank的密切相关菌株之间存在良好的关系,这些菌株来自不同的来源和国家。这项研究的意义在于,消费者健康可能因接触受污染的牛肉干而受到威胁。