González-Fandos E, Olarte C, Giménez M, Sanz S, Simón A
Departamento de Agricultura y Alimentación, Area de Tecnología de los Alimentos, Universidad de La Rioja, Logroño, Spain.
J Appl Microbiol. 2001 Nov;91(5):795-805. doi: 10.1046/j.1365-2672.2001.01452.x.
The aim of this study was to evaluate the potential of Listeria monocytogenes to grow in mushrooms packaged in two different types of PVC films when stored at 4 degrees C and 10 degrees C.
Mushrooms were packed in two polymeric films (perforated and nonperforated PVC) and stored at 4 degrees C and 10 degrees C. The carbon dioxide and oxygen content inside the packages, aerobic mesophiles, psychrotrophs, Pseudomonas spp., Listeria monocytogenes, faecal coliforms, Escherichia coli, anaerobic spores and major sensory factors were determined. The mushrooms packaged in nonperforated film and stored at 4 degrees C had the most desirable quality parameters (texture, development stage and absence of moulds). Listeria monocytogenes was able to grow at 4 degrees C and 10 degrees C in inoculated mushrooms packaged in perforated and nonperforated films between 1 and 2 log units during the first 48 h. After 10 d of storage, the populations of L. monocytogenes were higher in mushrooms packaged in nonperforated film and stored at 10 degrees C.
MAP followed by storage at 4 degrees C or 10 degrees C extends the shelf life by maintaining an acceptable appearance, but allows the growth and survival of L. monocytogenes.
According to this study additional hurdles must be studied in order to prevent the growth of L. monocytogenes.
本研究旨在评估在4℃和10℃储存时，单核细胞增生李斯特菌在两种不同类型聚氯乙烯薄膜包装的蘑菇中的生长潜力。
将蘑菇包装在两种聚合物薄膜（穿孔和未穿孔聚氯乙烯）中，并在4℃和10℃下储存。测定包装内的二氧化碳和氧气含量、需氧嗜温菌、嗜冷菌、假单胞菌属、单核细胞增生李斯特菌、粪大肠菌群、大肠杆菌、厌氧芽孢和主要感官因素。包装在未穿孔薄膜中并在4℃储存的蘑菇具有最理想的品质参数（质地、发育阶段和无霉菌）。在最初的48小时内，接种在穿孔和未穿孔薄膜包装的蘑菇中的单核细胞增生李斯特菌能够在4℃和10℃下生长1至2个对数单位。储存10天后，包装在未穿孔薄膜中并在10℃储存的蘑菇中单核细胞增生李斯特菌的数量更高。
气调包装后在4℃或10℃储存可通过保持可接受的外观来延长货架期，但允许单核细胞增生李斯特菌生长和存活。
根据本研究，必须研究额外的障碍以防止单核细胞增生李斯特菌的生长。
