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A relation of change in appearance to changes in sugar content and respiration rate in spinach during storage



A relation of change in appearance to changes in sugar content and respiration rate in spinach during storage



Journal of the Japanese Society for Food Science & Technology (Nippon Shokuhin Kogyo Gakkaishi) 36(12): 956-963



Spinach (Spinacia oleracea L. cv. Read) leaves cultivated at open-field and a greenhouse were stored at 0.degree., 10.degree., 20.degree. and 30.degree. C in the dark. The changes in respiration rate, sugar contents and appearance during storage at various temperatures were compared. (1) The sugar content of open-field grown spinach was two times higher than that of greenhouse grown spinach. The sugar content of spinach petiole was four times higher than that of spinach leaf blade. (2) The respiration rates of open-field grown spinach were 630 (CO2mg/kg .cntdot. h), 280, 123 and 42 mg when stored at 0.degree., 10.degree., 20.degree. and 30.degree. C in the dark, respectively. The respiration rates of greenhouse grown spinach were 343 (CO2mg/kg .cntdot. h), 163, 68 and 26 mg, respectively. The respiration rate of open-field grown spinach was 1.6 .apprx. 1.8 times higher than that of greenhouse grown spinach. (3) The sugar content of spinach decreased with increasing storage temperature. Decrease of sugar contents in outer leaves during storage was distinctly faster than that in inner leaves. (4) When spinach leaves were not yellowing, the ratio of measured sugar decrease to estimated sugar decrease from respiration was about 0.9, however. It decreased about 0.4 when spinach leaves were yellowing. (5) Yellowing of spinach leaves started when the sugar contents of the outer leaves dropped to 0.06 .apprx. 0.05 (g/100 g f.w.). The yellowing decreased the quality of bundled spinach. (6) The sugar content of open-field grown spinach was higher than that of greenhouse grown spinach. Respiration rate of spinach leaves cultivated at open-field were also higher than that cultivated at the greenhouse. There was little difference in shelf life between open-field grown and greenhouse grown spinach leaves.

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Accession: 006963287

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DOI: 10.3136/nskkk1962.36.12_956


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