FDSC 310 Lecture Notes - Lecture 11: Stoma, Gas Exchange, Respiratory Quotient
16 Dec 2017
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Document Summary
Achieved and maintained by selective permeability of the packaging film. Not a substitute, but a good supplement to. Ca/ma inside the package is achieved and maintained by selective diffusion of oxygen (in to the package) and carbon dioxide (out of package) At equilibrium, it represents a balance between produce respiration and package permeation. Temperature management is critical because both respiration and permeability depend on t. O2 and co2 are the two active components. Rest is nitrogen which is more a filler. Effect of o2 and co2 concentration on respiration rates. Map improves shelf-life of produce at all temperature, the best coming at the optimum storage temperature. Some examples of commodity generated ma (not controlled) Active process (gas flush) for a quick control of respiration, quick control of ethylene & vacuum to remove toxic gases. Passive process (produce respiration) is slow & results in some loss of quality.
