In this study the effect of different concentrations of three gas mixture (carbon dioxide, nitrogen, oxygen), and also vacuum conditions and flexible multi-layer films on pH of smoked kutum fish (Rutilus frisii kutum) at ambient condition (T = 25 °C) were evaluated. Ordinary conditions as control packagingwere compared with four types of modified atmosphere packaging: (70% N2 + 30% CO2), (30% N2 + 70% CO2), (45% CO2 + 45% N2 + 10% O2), and vacuum conditions. Smoked Kutum fishes were packaged in flexible multi-layer films under modified atmosphere packaging, 3-layer {(PET(12)/AL(12)/LLD(100)), 4-layer (PET(12)/AL(7)/PET(12)/LLD(100)) and 3-layer (PET(12)/AL(7)/LLD (100))}. Samples were performed chemical test (pH) at different times during 60 days ,with 15 treatment ,3 run, statistical analysis and comparison of data, were done by software SAS (Ver:9/1) and also Duncan’s new multiple range test, with confidence level of 95% (P<0.05). The shelf life of smoked kutum fishes (according to pH changes) were reported under conditions 1, 2 and 3 in 4-layer, 60, 58 and 45 days and in vacuum conditions were about 40 days, in 3-layer (AL:12), under conditions 1, 2 and 3 and vacuum conditions were 55, 50, 40 and 35 days, with 3 layers (AL:7), under conditions 1, 2 and 3 were45, 40 and 35 days and in vacuum conditions were 30 days. Maximum change of pH was related to 3-layer (AL:7) under 30% CO2 + 70% N2 and ordinary condition, the lowest changes belonged to 4-layer under 70% CO2 + 30% N2. The pH variable has not decreased rapidly, in each treatments during storage times (60 days), while can be explained by characteristic of this multi-layer flexible pouch with less water vapor and oxygen permeability, and increasing CO2 caused to control some chemical reactions such as pH changes in samples.
Zand, N., Mohammadi, A., Eshaghi, M. (2017). Effect of modified atmosphere packaging and multi-layer flexible films on pH of smoked Kutum Fish (Rutilus frisii kutum). Int. J. of Aquatic Science, 8(1), 34-40.
MLA
Nazanin Zand; Amin Sakian Mohammadi; Mohammad Reza Eshaghi. "Effect of modified atmosphere packaging and multi-layer flexible films on pH of smoked Kutum Fish (Rutilus frisii kutum)". Int. J. of Aquatic Science, 8, 1, 2017, 34-40.
HARVARD
Zand, N., Mohammadi, A., Eshaghi, M. (2017). 'Effect of modified atmosphere packaging and multi-layer flexible films on pH of smoked Kutum Fish (Rutilus frisii kutum)', Int. J. of Aquatic Science, 8(1), pp. 34-40.
VANCOUVER
Zand, N., Mohammadi, A., Eshaghi, M. Effect of modified atmosphere packaging and multi-layer flexible films on pH of smoked Kutum Fish (Rutilus frisii kutum). Int. J. of Aquatic Science, 2017; 8(1): 34-40.
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