EFFECTS OF IONIZING-RADIATION AND ANAEROBIC REFRIGERATED STORAGE ON INDIGENOUS MICROFLORA, SALMONELLA, AND CLOSTRIDIUM-BOTULINUM TYPE-A AND TYPE-B IN VACUUM-CANNED, MECHANICALLY DEBONED CHICKEN MEAT

被引:11
作者
THAYER, DW
BOYD, G
HUHTANEN, CN
机构
[1] Eastern Regional Research Center, USDA, ARS, Philadelphia, PA 19118
关键词
SALMONELLA; CLOSTRIDIUM; IRRADIATION; BOTULISM; MEAT;
D O I
10.4315/0362-028X-58.7.752
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Vacuum-canned, commercial, mechanically deboned chicken meat was challenged with either Clostridium botulinum spores (20 strains of types A and B, proteolytic; final spore concentration of ca. 400/g of meat) or Salmonella enteritidis (ca. 10(4) CFU/g of meat) followed by irradiation to 0, 1.5, and 3.0 kGy and storage at 5 degrees C for 0, 2, and 4 weeks. None of the samples stored at 5 degrees C developed botulinal toxin; however, when these samples were temperature abused at 28 degrees C they became toxic within 18 h and had obvious signs of spoilage, i.e., swelling of the can and a putrid odor. During 4 weeks of refrigerated storage the log(10) of the population of S. enteritidis in nonirradiated samples decreased from 3.86 to 2.58. S. enteritidis CFU were detectable in samples irradiated to 1.5 kGy at 0 weeks but not in samples irradiated to 3.0 kGy. Log levels of aerobic and facultative mesophiles increased during 4 weeks of refrigerated storage from 6.54 to 8.25, 4.03 to 8.14, and 2.84 to 5.23 in samples irradiated to 0, 1.5, and 3.0 kGy, respectively. Based on taxonomic analyses of 245 isolates, the bacterial populations depended upon radiation dose and storage time. The change was predominantly from gram-negative rods in nonirradiated samples to gram-positive streptococci in samples irradiated to 3.0 kGy and stored for 4 weeks. Spoilage organisms survived even the 3.0 kGy treatment.
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收藏
页码:752 / 757
页数:6
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