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Polarographic pO2-measurement in cruciferous vegetables stored at stable or changing O2-concentrations.

Praeger, U.; Weichmann, J.;

Acta Horticulturae Year: 2000 Issue: No. 518 Pages: 167-173 Ref: 12 ref.

2000

บทคัดย่อ

Polarographic pO2-measurement in cruciferous vegetables stored at stable or changing O2-concentrations.

Broccoli (cv. Marathon) spears and Brussels sprouts (cv. Boxer) buds harvested in July and October, respectively, were stored for 4 weeks at 2 deg C under linearly increasing, decreasing or stable O2-concentrations. CO2 concentration was kept below 4%. Oxygen partial pressures (pO2) were measured in the plant tissues at harvest and during storage to determine whether there was any correlation between pO2 in plant tissues and the O2 concentration of the storage atmosphere. Needle electrodes were used to measure pO2 by polarographic method in the plant tissue. The pO2 values showed significant differences depending on the O2-concentrations of the storage atmosphere. The highest values were found directly after harvesting and after storage in air. The lowest values were measured for the variants between 1% and 5% O2, at stable as well as at changing O2 concentrations of the storage atmosphere. Between 2 and 4 weeks' storage, the pO2-values of the tissues corresponded only partly to decreasing or in

creasing O2 levels of the atmosphere. The correlation coefficient (r) of pO2 values in the tissue and O2 concentration in the atmosphere after 2 and 4 weeks was 0.97 for Brussels sprouts and broccoli. CO2 production by broccoli was reduced after 4 weeks' storage in low O2 concentrations in comparison to storage in 21% O2, but this effect was not observed with Brussels sprouts.