A respiration –diffusion model for ‘Conference’ pears. II. Simulations and relation to core breakdown
J. Lammertyn , N. Scheerlinck, P. Jancsók, B. E. Verlinden and B. M. Nicolaï
Postharvest Biology and Technology Volume 30, Issue 1 , October 2003, Pages 43-55
2003
บทคัดย่อ
Arespiration –diffusion model for ‘Conference’ pears was used to simulate three-dimensional internal O2 and CO2 concentration profiles for intact pears as a function of the storage conditions. Although the skin was the major barrier to gas transport, the internal gas gradients in thefruitcould not be neglected. Especially at high temperatures, when therespirationrate is high, the internal gradients increased considerably. A sensitivity analysis was carried out to assess the effect of biological variability present on therespirationand diffusion parameters, and on the gas concentration profiles. It was found that at room temperature, the O2 concentration underneath thefruitskin is mainly determined by the O2 transfer coefficient and consumption rate. However, for typical storage temperatures this dependency is less pronounced. A comparison of simulated gas concentration contours of pears stored with delayed controlled atmosphere and those immediately stored under controlled atmosphere (CA), illustrated the importance of an appropriate storage management right after harvest. When CA storage was applied immediately after harvest, the O2 and CO2 concentrations reached very low and very high values, respectively, possibly causing irreversible membrane damage and inducing core breakdown. These values were not found for delayed controlled atmosphere. A model validation experiment on affected pears indicated that the diffusion andrespirationparameters for affected tissue were different from those for healthy tissue.