Effects of Precooling and Packaging Methods on Quality of Asparagus Spears during Simulated Distribution
2018
Yoon, H.S., Kangwon National University, Chuncheon, Republic of Korea | Choi, I.L., Kangwon National University, Chuncheon, Republic of Korea | Han, S.J., Kangwon National University, Chuncheon, Republic of Korea | Kim, J.Y., Kangwon National University, Chuncheon, Republic of Korea | Kang, H.M., Kangwon National University, Chuncheon, Republic of Korea
This study was conducted to determine effects of precooling and storage methods on asparagus spears’ quality such as changes of fresh weight and color during simulated export distribution. Two types of precooling methods, air cooling and hydrocooling, were applied prior to packaging by comparing with no precooling as a control. Asparagus spears were packed with oxygen transmission rate (OTR) film for modified atmosphere packaging (MAP) and perforated (PF) film for a conventional packaging. All treatments were stored at 8o C for 20 hours, and subsequently at 4o C by final storage day, which is simulated distribution temperature condition from Yanggu, Korea to Shimonoseki, Japan. The half cooling time was 12 minutes for air cooling and 15 seconds for the hydrocooling, indicating precooling process of asparagus spears faster with the hydrocooling. Rates of respiration and ethylene production were lowest with hydrocooling. Fresh weight loss was higher, approximately 11%, at the control condition in conventional storage, compared with the MAP, less than 0.5%. Carbon dioxide and oxygen content in the MAP was in the permissible ranges for asparagus spears under recommended CA/MA conditions under both the air cooling and hydrocooling. Ethylene content in the film package was lower with the precooling treatment. Firmness of stems was lowest with the hydrocooling prior to the MAP. Visual quality, off-odor, and hue angle value were best with hydrocooling prior to the MAP. In conclusion, the combination of hydrocooling with the MAP is effective in preserving quality during the export distribution process.
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