产毒金葡菌和粘质沙雷氏菌在蘑菇罐头中的生长及产毒、产TECRA阳性物质的规律

本文研究了产毒金葡菌(Staphylococcus aureus)、粘质沙雷氏菌(Serrolia marcescens)的纯培养物,以及pH条件变化时,它们各自与其它细菌共存时,在蘑菇罐头中的生长及产葡萄球菌肠毒素、产TECRA阳性物质的规律。并了解热处理对肠毒素和阳性物质的效应。结果表明,金葡菌和粘质沙雷氏菌均能在蘑菇罐头中生长,并产毒/产阳性物质,但罐头汤汁的pH较有利于后者的生长和产阳性物质。在混合菌相中,金葡菌是虚弱竞争者,生长及产毒均受抑制。粘质沙雷氏菌所产阳性物质与肠毒素一样,具有一定的热抗性。

Rule of the Growth of SETs Producing S. aureus and S. marcescens and of the Production of Staphylococcal Enterotoxin and TECRA Positive Matters Respectively in Canned Mushrooms

The results of this work showed that both S. aureus and S. marcescens were able to grow and to produce SETs and TECRA positive matters respectively, the pH of canned mushrooms'soup, however, was more favourable for the latter than for the former in growth and metablic matters production.S. aureus was a poor competitor and its growth and SETs production were inhibited in mixed flora in canned mushrooms. It is possible for the pH of the soups in canned mushrooms to protect the TECRA positive matters formed by S. marcescens from denaturation during processing at 121℃ for 35min,so it was about the same as SETs for the TECRA positive matters in thermal stability.