Abstract
The aim of the study was to investigate the effects of two modified atmospheres with a different combination of gases on selected groups of microorganisms and on concentrations of biogenic amines (BAs) in samples of poultry breast muscle. The samples were packaged under modified atmosphere A (75% O2 a 25% CO2) or B (75% N2 and 25% CO2) and stored at temperatures from +2 to +4 °C for 14 days. During the storage period, O2 concentrations in modified atmosphere A (MA A) decreased from the initial 74.8 ± 0.3% to 55.9 ± 6.6% at the end of the storage period. In all samples, counts of psychrotrophic bacteria counts, Brochothrix thermosphacta, lactic acid bacteria and coliform microorganism were determined. The tests were made on the packaging day, and then after three, nine and fourteen days of storage. At the end of the storage period, higher numbers of psychrotrophic bacteria (6.5 ± 0.7 log10 cfu g-1), Brochothrix thermosphacta (4.8 ± 0.3 log10 cfu g-1) and lactic acid bacteria (1.7 ± 0.4 log10 cfu g-1) were found on samples packaged under MA A. Samples packaged under modified atmosphere B on the other hand contained higher numbers of coliform bacteria (4.1 ± 0.6 log10 cfu g-1) at the end of the storage period. In addition to microbiological indicators, concentrations of biogenic amines (putrescine, cadaverine, histamine, tyramine, spermine, spermidine and β-phenylethylamine) were also determined. In fresh samples and after three days of storage, only spermine and spermidine were found. After 9 and 14 days, also other BAs were detected. The biogenic amine totals at the end of the storage period was 60.0 ± 13.2 mg kg-1 in samples packaged under MA A and 129.0 ± 41.3 mg kg-1 in samples packaged under MA B. The most abundantly represented biogenic amines in samples packaged under MA A were putrescine and spermine (49.7 and 24.8%, respectively, at the end of the storage period), and putrescine and cadaverine in samples packaged under MA B (47.0 and 32.9 %, respectively, at the end of the storage period).
Highlights
± 13.2 mg·kg-1 in samples packaged under modified atmosphere A (MA A) and 129.0 ± 41.3 mg·kg-1 in samples packaged under modifikované atmosféry B (MA B)
The aim of our study was to make a quantitative and qualitative comparison of microflora and the formation of biogenic amines in chicken breast muscle packaged under two types of modified atmospheres (A - 25% CO2 and 75% O2, B - 25% CO2 and 75% N2) during cold storage
After 9 and 14 days of storage, the most abundantly represented biogenic amines in samples packaged under MA A were putrescine and spermine (49.7 and 24.8%, respectively, at the end of storage period), and putrescine and cadaverine in samples packaged under MA B (47.0 and 32.9%, respectively, at the end of storage period)
Summary
± 13.2 mg·kg-1 in samples packaged under MA A and 129.0 ± 41.3 mg·kg-1 in samples packaged under MA B. Modified atmosphere packaging (MAP) has become widespread (Susiluoto et al 2003) in recent years to increase the shelf life of fresh chicken meat and chicken products. Shelf life of meat packaged under modified atmosphere is decisively influenced by its initial microbial contamination, the appropriateness of gas mixture used and strict cold chain compliance (Jeremiah and Gibson 2001; Farber 1991). S108 tyramine) that penetrate from food to blood circulation can cause health problems of psychoactive or vasoactive nature to people. These may include increased blood pressure, onset of migraines, increased heart and respiratory rates, etc. The aim of our study was to make a quantitative and qualitative comparison of microflora and the formation of biogenic amines in chicken breast muscle packaged under two types of modified atmospheres (A - 25% CO2 and 75% O2, B - 25% CO2 and 75% N2) during cold storage
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