This study was carried out upon a means for stably maintaining both O
2 and CO
2 concentrations within storage atmosphere in closed CA system.
In a clrosed CA system, the storage atmosphere is recirculated by an air pump through a scrubber. Exess CO
2 in CA chamber is removed by the scrubbing of the storage atmosphere.
Level of O
2 in CA chamber is controlled by means of the ventilation of fresh air. However, intermitent ventilation of air results in fluctuation in the concentration of O
2. Fundamental tests were carried out upon O
2 concentration in CA chamber.
The strongest correlation was observed between O
2 concentrations within modified atmospheres and O
2 contents of water under them.
It was clear that a part of O
2 within water have been discharged into modified atmosphere when water under air was touched low-oxygen atmosphere. In general, a scrubber using water makes possible a means for continuously removing the excess CO
2 in storage atmosphere.
Authors were found that water became a very usefull method to maintain both O
2 and CO
2 concentrations in CA chamber of closed system.
Such a laboratory apparatus had been designed as a approach Uota′s apparatus and used successfully in controlled atmosphere studies on eggplants. In new closed CA system, N
2 gas was introduced into the CA chamber to reduce the O
2 concentration at the first. Eggplants, as a result, were reduced the respiration rate. The most of CO
2 produced their respiration during the storage was removed by the water in the gas-exchanger. The O
2 being consumed with their respiration was supplied from O
2 of current water through the gas-exchanger, simultaneously. The scrubbing of atmosphere by a large amount of water would provide uniform levels of O
2 and CO
2 in CA chamber and the keeping quality of eggplants after three weeks had been well evaluated.
View full abstract