کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4367327 | 1616635 | 2012 | 11 صفحه PDF | دانلود رایگان |
This study evaluated the effect of modified atmospheres (MAs) with different O2 concentrations on microbial growth and volatile metabolite production in gray shrimp (Crangon crangon) during storage at 4 °C. Eight MAs were evaluated in total. Four of the MAs evaluated were without CO2: 0/0/100, 0/10/90, 0/30/70, 0/50/50 (% CO2/O2/N2) whilst the other four MAs all contained 50% CO2: 50/0/50, 50/10/40, 50/30/20, 50/50/0 (% CO2/O2/N2). Volatile spoilage metabolites were identified by thermal desorption GC-MS and quantified during storage by selective ion flow tube mass spectrometry (SIFT-MS). In comparison to microbial growth observed with an atmosphere of 100% N2, microbial growth was stimulated by the addition of O2 in the MAP in the absence of CO2. Under these conditions the total psychrotrophic counts exceeded 7 log cfu g− 1 after just 3 days of storage. However, in the presence of 50% CO2 the total psychrotrophic count exceeded 7 log cfu g− 1 after 5 days of storage. The combination of 50% CO2 and 50% O2 significantly inhibited microbial growth. For this MA condition, a diminishing effect on the production of metabolites was also observed, especially for amines and sulfur compounds, which constituted the major fraction of components causing the offensive odor.
► Effect of O2 in MAP on microbiological growth on gray shrimp.
► Effect of O2 on microbial metabolism on gray shrimp.
► Volatile spoilage metabolites measured with TD-GC-MS and SIFT-MS.
Journal: International Journal of Food Microbiology - Volume 160, Issue 1, 1 November 2012, Pages 65–75