MECHANISMS OF CARBON DIOXIDE GAS ADSORP-TION BY GRAINS AND ITS APPLICATION TO SKIN-PACKAGING

抄録

The data obtained with warburg's manometry have revealed that grains such as rice, wheat, corn, peanuts, soybeans, red beans, sesame seeds, and coffee beans and their flours can adsorb a significant amount of CO₂ gas. The mechanism of CO₂ adsorption phenomenon was examined. The results obtained are summarized as follows:
1. Solubility of CO₂ gas into the moisture and lipids of the grains is assumed to have a minor effect on this adsorption phenomenon.
2. Diffusion of CO₂ gas into the grain is important in this phenomenon. This adsorption phenomenon is very similar to that observed in sorp-tion of gases by charcoal and silica gel, which sorbe gases into their many pores. The CO₂ sorbed by the porous tissues of the grains is considered to remain in solid solution.
3. The amount of CO₂ gas adsorbed by brown rice under varying partial pressures follows the classic sorption isoterm of Freundlich.
4. Microautoradiographic experiments show that the radioactivity of ¹⁴CO₂ appears to be uniformly distributed throughout the tissues of germ and cotyledon.
The adsorption phenomenon has led to the development of a new techni-que for skin-packaging, the Carbon Dioxide Exchange Method (CEM). This method and two modifications are explained. The merit and useful-ness of these techniques are discussed.