|Authors: ||T. Dong, Y. Feng, J. Shi, M.I. Cantwell, Y. Guo, Q. Wang|
|Keywords: ||fresh-cut roots, respiration, PAL, PPO, phenolics, MDA, antioxidant activity|
Burdock, a nutritious root vegetable popular in Asian countries, is susceptible to browning when prepared as a fresh-cut product.
The effect of ethanol fumigation on browning of fresh-cut burdock during storage at 2-4°C was studied.
Roots were fumigated pre-cutting and post-cutting with 600 µL L-1 ethanol for 12 h and 450 µL L-1 for 5 h, respectively, and the effects on inhibition of browning, associated phenolic metabolism and antioxidant ability were evaluated.
Both the pre-cut and post-cut treatments were effective, retarding discoloration and maintaining better visual quality in treated than untreated slices.
Ethanol fumigation reduced the respiration rate, lowered the activities of polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) and total phenolic content of fresh-cut burdock.
Also, ethanol fumigation resulted in increased content of H2O2, higher catalase (CAT) activity, maintained 1,1-diphenyl-2-picrylhydrazyl (DPPH) inhibition, and decreased the content of malondialdehyde.
The results indicate that ethanol fumigation can extend the shelf-life of fresh-cut burdock by inhibiting the phenolic metabolism that causes browning.
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