Effects of Different Packaging on Preservation of Postharvest Lotus Root
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Abstract:
Fresh lotus roots were used as experimental materials, PE open bag (PEO), PE sealed bag (PES), modified atmosphere bag (MA) and modified atmosphere humidity control bag (MA/MH) were used for packaging treatment, and the packaged lotus roots were stored at 4±0.5 ℃ and 90% RH. The weight loss, brightness, browning degree, hardness, respiration intensity, relative conductivity, malondialdehyde content (MDA), para-phenol oxidase activity and peroxidase activity of lotus root were measured every 4 days. The results showed that MA and MA/MH packaging could effectively reduce the weight loss rate, maintain hardness, inhibit the rise of relative conductivity, delay the peak of respiratory intensity of lotus roots. The preservation effect of PEO was worser than MA and MA/MH, and PES had the worst effect. The browning degree values of MA and MA/MH treated group were 31.53% and 45.91%, respectively, lower than that of PEO treated group after storage for 16 days. During storage, the para-phenol oxidase activity and peroxidase activity of MA, MA/MH treated group were decreased, and the contents of MDA in MA and MA/MH treated group were 60.91% and 45.87% of that in PEO treated group. In conclusion, MA and MA/MH packaging can enhance the stress resistance, keep the cell membrane structure intact and extend the shelf life of lotus root. Among the four different packages, the MA/MH packaging is the most suitable for the preservation of lotus root.
