Studies On Respiration Rate Model Of Mung Bean Sprout In Modified Atmosphere Packaging

In this essay, we conduct experimental and theoretical research on the respiration rate model and breathing charecteristics of mung bean sprouts, by determinating the respiration rate of bean sprout at different temperature, aiming to provide some experimental and theoretical basis for the design of modified atmosphere packaging of bean sprouts. Concrete research content is as follows:1. This study calculated the change of concentration of mung bean sprouts storaged in air-tight jars at 8℃、13 ℃、 18 ℃、23 ℃ and 28 ℃, as well as the respiration rate values of mung bean sprouts. The results showed that the respiration rate of bean sprouts is rising as the temperature rises, and the rate of O2 is higher than that of CO2 during storage. It is also found that the relationship between the initial respiration rate of bean sprouts and temperature is in accordance with the Arrhenius equation.2. Under five test temperatures separately, this study established the second-order polynomial equations based on biostatistics theory, the Michaelis-Menten equations based on enzyme kinetics theory, as well as the chemical kinetics equations based on chemical kinetics theory. The predictive ability of the three kinds of respiration rate models of bean sprouts were verified at 5℃ and 15 ℃. The results show that a unified rule is not found in the individual parameter values for the second-order polynomial equations, and both the maximum respiration rate from Michaelis-Menten equations and the respiration rate constant k from chemical kinetics equations were found following the relationship of Arrhenius equation. Compared with other two models, the respiration rate models based on chemical kinetics has better fitting effect in the verification test.3. The result of determination on the permeability coefficients of LDPE film at the five test temperature point by selected, show that the permeability coefficient and permeability coefficient ratio of the selected film increases with increasing test temperature. In addition, the relationship between the permeability coefficient of the film with temperature obeys the Arrhenius equation.4. The bean sprouts packed by LDPE film was placed at different temperatures. The determinination of CO2 and O2 concentrations of headspace in the LDPE film packages, was calculated for the respiration rates of bean sprouts by C program. The test results were similar to air-tight jars. As the temperature increases, the respiration rates of bean sprouts increasing. In addition, with the rise of CO2 concentrations and the decrease of O2 concentration, the respiration rate of bean sprouts was decreasing. The chemical kinetics model equation fitted to the respiration rate of bean sprouts, the approximation between the initial respiration rate of bean sprouts calculated by equation and that of experiment was less than 10%.5. The respiration rate models and the permeability coefficients of LDPE film were researched in this paper, as well as the description of the specific application of the models. All of these results can guide the design of MAP in theory.