The effect of modified atmosphere packaging and flexible films on growth of bacterias of dried kashk

In this study the effect of different concentrations of three gas mixture (carbon dioxide, nitrogen, oxygen), vacuum conditions and also ordinary conditions as control and flexible multi-layer films for extending shelf life of dried kashk at 20 0C were evaluated. Ordinary conditions as control packaging were compared with four type of modified atmosphere packaging: ((70% N2 + 30% CO2), (48% CO2 +48% N2 +4% O2), (30% N2 + 70% CO2)), and vacuum conditions, in this project. These samples, (Dried Kashk) were packaged in different flexible multi-layer films under modified atmosphere packaging, 3-layer {PET(12)/ AL(12) (100)},4-layer {PET(12)/AL(7) /PET(12)/LLD (100)} and 3-layer {PET(12)/AL(7)/LLD(100)}. Experiments were performed on samples as follows (total aerobics count, total anaerobics count, pH ، organoleptical evaluations, and analyzed by SPSS. The shelf life , dried kashk were reported in 4-layer , under conditions (70% CO2 + 30% N2) & (vacuum) & (48% CO2+ 48% N2+ 4% O2) 60, 55, 45 days in (30% CO2 + 70% N2)  and in ordinary conditions were 40 , 30 days, in 3 layer (AL:12), under conditions (70% CO2 + 30% N2) & (vacuum) & (48% CO2+ 48% N2+ 4% O2) 50, 45, 35 days and in (30% CO2 + 70% N2) and in ordinary conditions were about 30,25 days, with 3 layer (AL:7), under conditions (70% CO2 + 30% N2) & (vacuum) & (48% CO2+ 48% N2+ 4% O2) 40, 35, 30 days, in (30% CO2 + 70% N2) conditions 25 days and in ordinary condition were 20 days. So,the usage of 4-layer , under conditions (70% CO2 + 30% N2) for shelf life prolongation of dried kashk was evaluated better for long times.In this study the effect of different concentrations of three gas mixture (carbon dioxide, nitrogen, oxygen), vacuum conditions and also ordinary conditions as control and flexible multi-layer films for extending shelf life of dried kashk at 20 0C were evaluated. Ordinary conditions as control packaging were compared with four type of modified atmosphere packaging: ((70% N2 + 30% CO2), (48% CO2 +48% N2 +4% O2), (30% N2 + 70% CO2)), and vacuum conditions, in this project. These samples, (Dried Kashk) were packaged in different flexible multi-layer films under modified atmosphere packaging, 3-layer {PET(12)/ AL(12) (100)},4-layer {PET(12)/AL(7) /PET(12)/LLD (100)} and 3-layer {PET(12)/AL(7)/LLD(100)}. Experiments were performed on samples as follows (total aerobics count, total anaerobics count, pH ، organoleptical evaluations, and analyzed by SPSS. The shelf life , dried kashk were reported in 4-layer , under conditions (70% CO2 + 30% N2) & (vacuum) & (48% CO2+ 48% N2+ 4% O2) 60, 55, 45 days in (30% CO2 + 70% N2)  and in ordinary conditions were 40 , 30 days, in 3 layer (AL:12), under conditions (70% CO2 + 30% N2) & (vacuum) & (48% CO2+ 48% N2+ 4% O2) 50, 45, 35 days and in (30% CO2 + 70% N2) and in ordinary conditions were about 30,25 days, with 3 layer (AL:7), under conditions (70% CO2 + 30% N2) & (vacuum) & (48% CO2+ 48% N2+ 4% O2) 40, 35, 30 days, in (30% CO2 + 70% N2) conditions 25 days and in ordinary condition were 20 days. So,the usage of 4-layer , under conditions (70% CO2 + 30% N2) for shelf life prolongation of dried kashk was evaluated better for long times.