Effects of ozone exposure on 'Golden' papaya fruit by photoacoustic phase-resolved method: Physiological changes associated with carbon dioxide and ethylene emission rates during ripening

This work addresses the effects of ozone activity on the physiology of 'Golden' papaya fruit. Depth profile analysis of double-layer biological samples was accomplished using the phase-resolved photoacoustic spectroscopy. The feasibility of the method was demonstrated by singling out the s...

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Bibliographic Details
Published in:Journal of applied physics 2011-06, Vol.109 (11), p.114701-114701-7
Main Authors: Corrêa, Savio Figueira, Mota, Leonardo, Paiva, Luisa Brito, Couto, Flávio Mota do, Silva, Marcelo Gomes da, Oliveira, Jurandi Gonçalves de, Sthel, Marcelo Silva, Vargas, Helion, Miklós, András
Format: Article
Language:English
Subjects:
60 APPLIED LIFE SCIENCES
ALKENES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
EMISSION
ETHYLENE
FLUORESCENCE
FOOD
FRUITS
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
INSTALLATION
IRRADIATION
LAYERS
LIFETIME
LUMINESCENCE
MINIMIZATION
OPTIMIZATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOACOUSTIC SPECTROSCOPY
PHOTOCHEMICAL REACTIONS
PHOTON EMISSION
PHOTOSYNTHESIS
PIGMENTS
REACTOR COMPONENTS
REMOVAL
RIPENING
SPECTRA
SPECTROSCOPY
SYNTHESIS
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Summary:This work addresses the effects of ozone activity on the physiology of 'Golden' papaya fruit. Depth profile analysis of double-layer biological samples was accomplished using the phase-resolved photoacoustic spectroscopy. The feasibility of the method was demonstrated by singling out the spectra of the cuticle and the pigment layers of papaya fruit. The same approach was used to monitor changes occurring on the fruit during ripening when exposed to ozone. In addition, one has performed real time studies of fluorescence parameters and the emission rates of carbon dioxide and ethylene. Finally, the amount of pigments and the changes in waxy cuticle have been monitored. Results indicate that a fruit deliberately subjected to ozone at a level of 6 ppmv underwent ripening sooner (at least 24-48 h) than a fruit stored at ambient conditions. Moreover, ozone caused a reduction in the maximum quantum yield of photosynthetic apparatus located within the skin of papaya fruit.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3592353