Study On The Preservation Of Modified Atmosphere Film For Agaricus Bisporus And Its Fresh-keeping Effect

In this study,polyadipate/butylene terephthalate(PBAT)was used as the main component,and a certain mass ratio of polycaprolactone(PCL)was added for melt blending to change its barrier properties and gas permselectivity,adapts to the spontaneous balanced atmosphere modified packaging(EMAP)of Agaricus bisporus.By changing the thickness of the film and the quality of the Agaricus bisporus,the most suitable atmosphere conditions were selected and extending the shelf-life.The properties of the material were examined at first.The oxygen,carbon dioxide,and water vapor permeability were investigated to evaluate the barrier properties of films.The tensile test was performed to evaluate the mechanical properties.Differential Scanning Calorimetry(DSC)for analyzing thermal properties of materials.Optical microscope was used to observe the compatibility under the molten state.Secondly,the fresh-keeping performance of the film for Agaricus bisporus was investigated and evaluated by sensory evaluation,weight loss rate,headspace body composition,respiratory intensity,Agaricus bisporus hardness,whiteness(L* value),soluble protein content,and polyphenol oxidase activity.The results show that the PBAT/PCL30 film has the utmost packaging performance.With the addition of PCL,the barrier properties of the film are enhanced,and the selective transmission ratio of CO2/O2 is reduced.Compared with the PBAT film,under the same conditions,the increase in crystallinity leads to a 49% reduction in the oxygen transport coefficient,and the CO2/O2 selective transmission ratio is reduced to 8:1.With different thicknesses of PBAT/PCL30 films,the oxygen and water vapor transmission rates were decreased with increasing of thickness,and the crystallinity were increased,and the Young's modulus was increased by 105 MPa.In the preservation experiment,20-80 groups can maintain a stable gas composition for a long time: 0.5 to 0.6% of O2 and 3 to 3.5% of CO2,and high CO2 and low O2 atmosphere conditions can maintain good sensory while keeping the normal physiological indicators and extending the shelf life to 14 days.In summary,the blended modified film is favorable for the preservation of Agaricus bisporus and maintains a stable atmosphere,which is suitable for the construction of a green environmental protection packaging of Agaricus bisporus.