The influence of oxygen concentration in the atmosphere on anaerobic metabolites produced by several apple cultivars
2001
Golias, J. | Nemcova, A. | Suderlova, L. | Balik, J. | Veverka, J. | Kyselakova, M. (Mendelova Zemedelska a Lesnicka Univ., Lednice na Morave (Czech Republic). Zahradnicka Fakulta)
Storage of Golden Delicious, Jonagold, Melrose, Idared apples (Malus domestica) in ultra-low oxygen (0.9 % O2), anaerobiosis (0.2 % O2) and regular atmosphere (21 % O2), plus 0.3 % CO2 and 0.03 % CO2 respectively, indicated that an exposure to ULO suppressed the production of metabolic compounds such as acetaldehyde, ethanol and ethyl acetate. Fruit tolerance to specific atmospheres yielding anaerobic products was determined. The tissue ethanol content in ULO and RA atmosphere ranged from 40 to 112 mg/l and from 4 to 7 mg/l, respectively. The concentration of ethanol in anaerobiosis reached 790-830 mg/l in 30 days. The oxygen stress also caused a high concentration of acetaldehyde. The gaseous metabolites released across the skin were measured in microg/kg per h being captured in the sorbent and then gas-chromatographically analysed for acetaldehyde, ethanol and ethyl acetate. As their accumulation in the liquid phase leads to their release into the environment, the variant RA could be dramatically distinguished from ULO and AN. There were only minimal differences between ULO and RA in nonvolatile compounds such as sucrose, glucose, fructose and malic acid. Tukey`s test could not distinguish between the means of individual cultivars and treatments. An increase in the consumption of malic acid was identified between the ULO and the AN storage. Pulp firmness was depressed only in RA.
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