ChillSafe ROS Technology – How does ROS work?

The ChillSafe® eco hygiene solution is a technology that absorbs moisture from the air to environmentally activate and release a reactive oxygen species (ROS) vapour into the refrigerated space. ROS are molecules which have an electron in an excited (active) state associated with oxygen atom(s) in the molecule. The active electron provides the energy which makes ROS particularly effective deodorising and disinfection agents. All ROS are present in the natural environment and perform important roles in atmospheric chemistry, water chemistry and plant and animal metabolism.

The ChillSafe process is continual in that as soon as a reactive oxygen (RO) molecule reacts with an organism it is removed from the vapour phase and decomposes into water and oxygen. However, RO vapours removed from the space are replaced from the reservoir of RO formed in our ChillSafe sachet and released into the space being treated.

In use, the reactive oxygen species released from the ChillSafe sachet attack and break down bacterial cell walls at a cellular level when it comes into contact with them. The reactive and volatile molecules of ethylene are attacked by RO vapour which reacts with the carbon double bond (C=C) in ethylene, and under the right conditions, oxidises to carbon dioxide and water.

Coolsan selected hydrogen peroxide as the preferred ROS for the ChillSafe sachet for use in cool rooms due to the ease of use, the inherent control provided by low vapour pressure and the decomposition products that are created when the molecule decomposes on contact with bacteria (water and oxygen) or ethylene (water and carbon dioxide) molecules.

Another advantage of the ChillSafe ROS technology, contrary to most other sanitation technologies available to sanitise refrigerated spaces, is that a safe[a], steady, continuous supply of sanitation vapour is applied to the area being treated, without the need for complex and/or expensive distribution equipment. In addition, the chemicals used have general approval for use in food storage and other sensitive areas.

[a] Hydrogen Peroxide Safety Resources

The effects of ROS on a bacteria cell

The outer membrane is broken by the transfer of active electrons from the RO molecules to the cell wall.

The performance of our technology

The chart below shows the accumulative effects on microbial loads utilising the ChillSafe process over three independent establishments.

ChillSafe results graph

The chart below highlights the positive effects the ChillSafe technology has in the reduction of ethylene in a refrigerated space. The blue line shows the ‘control’ fridge under normal conditions without ChillSafe, the red line shows the fridge treated with ChillSafe. Overall we reduced ethylene by 75%, a 41% improvement on normal conditions in a 24 hour period.

ChillSafe ethylene reduction graph