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

Abstract

Photorespiration and temperature dependence of oxygen evolution in tomato plants monitored by open photoacoustic cell technique Rev. Sci. Instrum. 74, 706 (2003); 10.1063/1.1517753 Effect of heat treatment on ethylene and CO 2 emissions rates during papaya (Carica papaya L.) fruit ripening Rev. Sci. Instrum. 74, 703 (2003); 10.1063/1.1517752Photoacoustic measurements for catalytic effects of perovskite electrodes in a sealed-off CO 2 discharge tube 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.

Atividade Respiratória Em Mitocôndrias Isoladas Da Polpa Do Mamão Uenf/Caliman 01 E Tainung 01 Na Conservação Do Fruto Em Pós-Colheita

“…A perda de firmeza pelos frutos é um fator limitante para o manejo dos frutos e para a aceitação pelos consumidores (cuQueL et al, 2012 não foi possível observar a ocorrência de um pico na respiração total, a partir dos modelos de regressão utilizados, como seria esperado para o mamão (FONSECA et al, 2006;SOUZA et al, 2009;CORRÊA et al, 2011) por se tratar de um fruto climatérico. Todavia, registrou-se a maior taxa de RT no terceiro dia de armazenamento, apesar de não significativa, sugerindo que a avaliação se deu próxima ao pico climatérico ou que o pico climatérico é atípico ou pouco intenso.…”

Photoacoustic Spectroscopy and Hyperglycemia in Experimental Type 1 Diabetes

“…14 It is possible to separate the components of spectra that are spliced due to signal/noise ratio through the phase-resolved method (PRM) applied to the PAS. 15…”

Monitoring of ammonia concentrations from coir-husk litter of Brazilian poultry house using diode laser photoacoustic spectroscopy

“…In photoacoustic sensors, however, the absorbed light is directly measured (Hodgkinson & Tatam, 2013 ), ensuring greater sensitivity. Already consolidated in science, photoacoustics has been used to detect gases (according to the radiation source used) and different applications (Bueno et al, 2015 ; Corrêa, 2011 ; Filho et al, 2008 ; Linhares et al, 2019 ; Pereira et al, 2009 ; Pinheiro et al, 2019 ; Schmohl et al, 2002 ; da Silva et al, 2003 ; Sthel et al, 2011 , 2012 ; Webber et al, 2005 ). Nonetheless, photoacoustics combined with the use of QW-DFB lasers as a radiation source is a novelty at monitoring NH employed to indoor gas samples from broiler raising in Brazil, in which electrochemical and simple commercial infrared sensors are generally used—as the Chillgard RT—which tend to have lower selectivity and accuracy (Li et al, 2015 ).…”