Oyster sauce is easily contaminated by microorganisms in the air during the process of using and storing the oyster sauce after opening the lid, resulting in the deterioration of the quality of oyster sauce.To investigate the microorganisms in the deteriorated oyster sauce and their influence on the quality of oyster sauce, this study was conducted to isolate, purify, and identify the spoilage bacteria in the finished deteriorated oyster sauce and to determine the changes of total protease, α-amylase, moisture, protein, volatile salt nitrogen, amino acid nitrogen, total acid, and sugar before and after the deterioration of five oyster sauces.Results showed that the microorganism that caused the deterioration of oyster sauce was Aspergillus chevalieri.After the deterioration of oyster sauce, the activities of amylase and total protease increased significantly, with maximum increases of 165% and 121%, respectively, the moisture content, total acid, amino acid nitrogen, and volatile salt nitrogen content showed an overall trend of increase, with the maximum increases of 6.79%, 39.27%, 71.43%, and 300%, respectively.The content of sucrose, reducing sugars, and proteins showed a decreasing trend, with the maximum decreases of 55.95%, 71.69%, and 29.64%, respectively.The overall morphology of oyster sauce contaminated by Aspergillus chevalieri will be changed to some extent, and the content of nutrients will also be reduced.
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