Respiration Rate of Sweet Cherries: ‘Burlat’, ‘Sunburst’ and ‘Sweetheart’ Cultivars

Abstract

Oxygen depletion and CO 2 formation were measured using a closed system method at various temperatures. No CO 2 inhibition effect was observed. Respiration rates were related to O 2 concentration by a simple Michaelis-Menten equation. Lineweaver-Burk plots of respiratory rate versus O 2 concentration were nonlinear over the whole O 2 concentration range explored. However, this type of analysis allowed us to differentiate two O 2 concentration intervals (above and below 10%) in which the double reciprocal plots are linear. Respiration rates decreased with decreasing temperature following the Arrhenius law. The Michaelis-Menten equation constants V m and K m for the 3 cultivars at 2, 5, and 20°C are tabulated.

Respiration rate of banana fruit under aerobic conditions at different storage temperatures

“…A close observation of the plot showed that the plot actually appeared to have two regions. Similar results were also observed by Song et al (1992) and Jaime et al (2001). This was attributed to a change in the rate limiting enzymatic action, as each enzyme may be affected differently by changes in temperature.…”

Mathematical modeling of the influence of temperature and gas composition on the respiration rate of shredded carrots

“…This system of measurement has been largely reported in the literature (Cameron et al, 1989;Hagger et al, 1992;Morales-Castro et al, 1994;Ratti et al, 1996;Lee and Lee, 1996;Jacxsens et al, 2000;Jaime et al, 2001;Hong and Kim, 2001;Mahajan and Goswami, 2001;Fonseca et al, 2002;Song et al, 2002;Lencki et al, 2004;Thiele et al, 2006;Techavuthiporn et al, 2008 andBhande et al, 2008). Four replicates (0.15 kg each sample) were used at a time for each temperature and for each gas composition tested.…”

Armazenamento de pitanga sob atmosfera modificada e refrigeração: I-transformações químicas em pós-colheita

“…A redução da temperatura de armazenamento é o meio mais eficiente em prolongar a vida útil de produtos colhidos (Kays, 1997); no entanto, a sensibilidade a baixas temperaturas pode resultar em danos pelo frio, restringindo o tempo de armazenamento e a vida útil pós-colheita de frutos (Morris, 1982). A modificação da atmosfera tem sido bastante utilizada com o objetivo de minimizar as perdas e prolongar a vida útil pós-colheita de frutos e hortaliças (Jaime et al, 2001). O estabelecimento de uma composição gasosa diferente da do ar, pela redução do nível de O 2 e elevação de CO 2 no interior da embalagem, pode resultar na redução da atividade metabólica do produto (Beaudry, 2004), sendo mais evidenciada quando associada à refrigeração (Kays, 1997).…”