Respiration rate model for mature green capsicum (Capsicum annum L.)
under closed aerobic atmospheric conditions
Ranjeet Singh1*, S. K. Giri1, K.V. R. Rao2
1Agro-Produce Processing Division, Central Institute of Agricultural Engineering, Nabi-Bagh, Berasia Road, Bhopal-462 038, India
2Precision Farming Development Centre,Central Institute of Agricultural Engineering, Nabi-Bagh, Berasia Road, Bhopal-462 038, India
The respiration rate of green capsicum cv. ‘Swarna’ fruits harvested at mature green stage were determined under closed system at 10, 15 and 20 ºC temperatures. A simple Michaelis-Menten kinetic modelcoupled with Arrhenius-type equation, which describes temperature as a function of respiration rate, was used to model the respiration rate of capsicum. The respiration rate model parameters at defined temperature were estimated by fitting the model to the experimental set of data by non-linear regression analysis method. The respiration rate of green mature capsicum was influenced by the temperature. The Arrhenius equation well described the relationship between enzyme kinematics model parameters and temperature. The values of Michaelis-Menten constant for oxygen (Kmo2) and carbon dioxide (Kmco2)were found to vary from 2.14 to 3.92 and 1.33 to 3.24, respectively at different temperature. Experimental and predicted RRO2 values for mature green capsicum was found to be ranged from 9.54 to 14.54 and 11.81 to 17.52 mg/kg-h, respectively. Whereas, the experimental and predicted RRCO2 were 20.1 to 38.51 and 22.15 to 39.83 mg/ kg-h, respectively.
Keywords: Capsicumfruit, respiration rate, enzyme kinematic model and validation