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We studied the fresh-keeping effects of PE plastic wrap and PLA film on broccoli. The results showed that the use of PLA film packaging could inhibit broccoli from turning yellow and curd shedding, and effectively maintain the contents of chlorophyll, vitamin C and soluble solids in broccoli. PLA film has excellent gas selective permeability, which helps to form a storage environment with low O2 and high CO2 in the PLA packaging bag, which can inhibit the life activities of broccoli and reduce the loss of water and the consumption of nutrients. The results showed that: compared with PE plastic wrap, PLA film packaging can prolong the shelf life of broccoli at room temperature by 1 to 2 days, and the preservation effect is obvious.

The degradation products of PLA can assist plants to become the raw material of PLA through photosynthesis, so PLA is a green material "from cradle to cradle". At present, PLA is the raw material of mainstream disposable tableware on the market. PLA is relatively stable at room temperature, but it is easy to degrade rapidly in a slightly high temperature environment, acid-base environment or microbial environment, and has poor impact resistance, which often cannot meet the requirements of circulation in harsh environments.