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从肉类中分离出的伦登假单胞菌的生物膜形成特性

Biofilm Formation Characteristics of Pseudomonas lundensis Isolated from Meat.

作者信息

Liu Yong-Ji, Xie Jing, Zhao Li-Jun, Qian Yun-Fang, Zhao Yong, Liu Xiao

机构信息

College of Food Science and Technology, Shanghai Ocean Univ, Shanghai, 201306, China.

Henry Fok School of Food Science and Engineering, Shaoguan Univ, Shaoguan, 512005, China.

出版信息

J Food Sci. 2015 Dec;80(12):M2904-10. doi: 10.1111/1750-3841.13142. Epub 2015 Nov 9.

Abstract

Biofilms formations of spoilage and pathogenic bacteria on food or food contact surfaces have attracted increasing attention. These events may lead to a higher risk of food spoilage and foodborne disease transmission. While Pseudomonas lundensis is one of the most important bacteria that cause spoilage in chilled meat, its capability for biofilm formation has been seldom reported. Here, we investigated biofilm formation characteristics of P. lundensis mainly by using crystal violet staining, and confocal laser scanning microscopy (CLSM). The swarming and swimming motility, biofilm formation in different temperatures (30, 10, and 4 °C) and the protease activity of the target strain were also assessed. The results showed that P. lundensis showed a typical surface-associated motility and was quite capable of forming biofilms in different temperatures (30, 10, and 4 °C). The strain began to adhere to the contact surfaces and form biofilms early in the 4 to 6 h. The biofilms began to be formed in massive amounts after 12 h at 30 °C, and the extracellular polysaccharides increased as the biofilm structure developed. Compared with at 30 °C, more biofilms were formed at 4 and 10 °C even by a low bacterial density. The protease activity in the biofilm was significantly correlated with the biofilm formation. Moreover, the protease activity in biofilm was significantly higher than that of the corresponding planktonic cultures after cultured 12 h at 30 °C.

摘要

腐败菌和致病菌在食品或食品接触表面形成生物膜已引起越来越多的关注。这些情况可能会导致食品腐败和食源性疾病传播的风险增加。虽然伦德假单胞菌是导致冷藏肉腐败的最重要细菌之一,但其形成生物膜的能力鲜有报道。在此,我们主要通过结晶紫染色和共聚焦激光扫描显微镜(CLSM)研究了伦德假单胞菌的生物膜形成特性。还评估了目标菌株的群集运动和游动运动、在不同温度(30、10和4℃)下的生物膜形成以及蛋白酶活性。结果表明,伦德假单胞菌表现出典型的表面相关运动能力,并且在不同温度(30、10和4℃)下都有很强的生物膜形成能力。该菌株在4至6小时时开始附着于接触表面并形成生物膜。在30℃下培养12小时后,生物膜开始大量形成,并且随着生物膜结构的发展,胞外多糖增加。与30℃相比,在4℃和10℃下即使细菌密度较低也能形成更多的生物膜。生物膜中的蛋白酶活性与生物膜形成显著相关。此外,在30℃下培养12小时后,生物膜中的蛋白酶活性明显高于相应的浮游培养物。

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