Tolerance of plum (Prunus domestica) fruits stored in low-oxygen atmosphere
2004
Golias, J. | Nemcova, A. | Suderlova, L. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Poskliznove Technologie Zahradnickych Produktu)
The effect of storage atmosphere on the concentrations of ethanol, acetaldehyde, non-volatile compounds and texture was evaluated in plum fruits. Plum fruits of the cultivars Stanley and Valjevka picked at the beginning of climacteric phase were stored in atmospheres with different concentrations of CO2 and O2 for 31 days at 3 deg C. In anaerobic conditions (0.2 % of oxygen) ethanol concentration reached 1,109 mg/L for Valjevka and 628 mg/L for Stanley. Ethanol production followed a steeply increasing concave curve. After transfer to the air, there was a phase of a drop of the production rate. The ultra low oxygen concentration (0.9 %) did not cause any physiological harm to the tissues, but after 31 days of storage an ethanol increase to half concentration of that in cv. Valjevka fruits stored in anaerobic conditions was observed. From this aspect plums seem to be relatively sensitive to low oxygen. The senescence of fruits stored in the air caused an increase in ethanol production rate that was exponentially increased after 20 days of cold storage. The final concentration after 53 days was still higher for cv. Valjevka than for cv. Stanley (828 mg/L vs. 498 mg/L). The skin softened more rapidly in the cv. Valjevka than in cv. Stanley.
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