Combined Application of Antibrowning, Heat Treatment and Modified-Atmosphere Packaging to Extend the Shelf Life of Fresh-Cut Lotus Root

초록

This work aimed to determine the effects of different concentrations of antibrowning treatments (that is, distilled water [DW], 1% ascorbic acid [AA], 0.5% chamomile [CM], and 1% AA + 0.5% CM) and heat-treatment (55 degrees C for 45 s) combined with packaging under 4 different modified-atmosphere gas compositions (that is, air, vacuum, 100% CO2, 50% CO2/50% N-2) on the quality and microbiological characteristics of fresh-cut lotus root. The quality characteristics (that is, color, weight loss, texture, pH, polyphenoloxidase activity, and total phenolic content) of the AA + CM-dipped sample in 100% CO2 packaging were maintained significantly better than those of the other samples (P < 0.05). The microbiological counts observed in the DW-dipped sample during storage were higher than those of the AA, CM, and AA + CM samples, and heat-treatment retarded the microbiological deterioration of fresh-cut lotus root. Therefore, the results revealed that dipping in an antibrowning treatment (AA + CM), and 100% CO2 MAP with heat treatment effectively extend the shelf life of fresh-cut lotus root to 21 d at 5 degrees C. Practical Application Antibrowning treatments with MAP packaging were effective at the maintaining quality characteristic of fresh-cut lotus root and heat-treatment showed a significant effect on the suppression of the growth of microorganisms. AA+CM with 100% CO2 packaging and heat treatment showed the most suppressed browning reaction by decreased PPO activity and less total phenolic contents and was considered to be effective to extend the shelf life of fresh-cut lotus root while maintaining their quality characteristics and microbiological safety.

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