Quality Change of Asparagus Spears Stored with Snow Cooling

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  • Nikaido Kana
    Graduate School of Environmental Science, Hokkaido University
  • Jishi Tatsuru
    Kamikawa Agricultural Experiment Station, Hokkaido Research Organization
  • Maeda Tomoo
    Faculty of Agriculture and Life Science, Hirosaki University
  • Suzuki Takashi
    Research Faculty of Agriculture, Hokkaido University
  • Araki Hajime
    Field Science Center for Northern Biosphere, Hokkaido University

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  • 雪冷熱を利用した貯蔵におけるアスパラガス若茎の品質変化

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Abstract

Asparagus has a short shelf life. A temperature of 0–2°C with a relative humidity of 95–100% is well known as the ideal storage environment for asparagus spears. The quality of spears stored in a snow vault and snow mount (Snow) was compared with those stored in an electric refrigerator (Refrigerator). Asparagus spears of ‘Grande’ and ‘Gijnlim’ were stored in Snow and Refrigerator for 0, 2, 5, 10, and 20 days; then, 1) physical and external appearance characteristics such as hardness, weight, and surface color, and 2) features of internal quality such as Brix, sugar, ascorbic acid, and rutin content in the spears were investigated. Although temperature and relative humidity fluctuated largely in the ranges of 3–6°C and 65–85% in Refrigerator, those in Snow were almost completely stable at 0–1°C and 100%. In ‘Grande’, the weight of the spears stored in Refrigerator decreased dramatically compared with that of spears stored in Snow. The external appearance of ‘Gijnlim’ spears was preserved until the 10th day, but loose tips were observed on the spears in both Snow and Refrigerator on the 20th day. ‘Grande’ spears stored in Refrigerator turned slightly brown and wilted at the surface of the basal part compared with Snow-stored spears. No loose tips were observed on ‘Grande’ spears. There was also no significant difference in the internal quality of spears between those stored in Snow and Refrigerator, in both varieties. CO2 emissions in snow storage were reduced to half of those in refrigerator storage in LCA analysis and no CO2 emissions were identified during the storage period in Snow. From the perspectives of energy utilization and quality preservation, snow appears to be one of the better alternatives for spear preservation than use of a refrigerator.

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