Effects Of Nano-Packing On Preservation Quality Of Flammulina Velutipes And Agaricus Bisporus

A novel polyethylene (PE) packing consisted of activated nanoparticles was applied in the preservation of winter mushroom (Flammulina velutipes) and white mushroom (Agaricus bisporus), while the regular polyethylene (PE) packing film was used to as contract. The physiology and bio-chemical variation during preservation on the two representative mushrooms above were screened by experiments under 4℃. The main research results were as follows:1. Winter mushroom (Flammulina velutipes) was taken to be a research object for it is liable to turn brown and blet during storage. The winter mushroom's changing laws of scenery quality, biologic index and chemical index were investigated in order to study the nano-packing's effects on winter mushroom as well as its preserve mechanism was discussed.After 15 days storage under 4℃, the color of Flammulina velutipes which packed by nano-packing had not turned browning notablely while no dark splash, mold infection and autolyze spot had been observed. Meanwhile, the Flammulina velutipes packed by nano-packing film has a high level of browning degree of 1.56 and its relative conductivity was 6.27%, both of them were lower than the contract significantly (p<0.01). Additionally, the total sugar content, reduce sugar content, soluble protein content and free amino acid content in the winter mushroom under nano-packaging material were well presented which were higher than the contract vials for 10.52%,33.53%,22.13% and 10.09%.2. White mushrooms (Agaricus bisporus) are easy to loss their merchandise quality for weigh loss and browning. The change rules of white mushrooms'composite quality during preservation were studied based statistics from trials in which white mushrooms were stored in two different packing specs,180 gram per bag and 1800 gram per bag, under 4℃. 10 days later, the weigh loss, the polyphenol oxidase (PPO) activity, relative conductivity and malondialdehyde (MDA) content of white mushroom under 180 gram per bag showed a significant decrease of 53.62%.25.19%,25.75% and 14.36% to the counterparts packed by normal PE films. At the meantime, the total sugar content, reduce sugar content, soluble protein content and free amino acid content were higher than the contracts.A familiar result was also found in the spec of 1800 gram per bag:the weigh loss, the polyphenol oxidase (PPO) activity, relative conductivity and malondialdehyde (MDA) content had been lower 21.48% 30.77%,25.04% and 24.89% than their contracts, while their Lightness(value L), total sugar content and reduce sugar content as well as soluble protein content and free amino acid content were 84.51,23.82 mg·g-1,9.79 mg·g-1,15.65 mg·g-1 and 11.21 mg·g-1, all of them were higher than its counterparts.The obtained results suggested that the nano-packing had showed a better preserve effect both on winter mushroom (Flammulina velutipes) and white mushroom (Agaricus bisporus) by greatly improving their scenery quality, biologic index and chemical components.