Discussion
Which one of the following absorbents is NOT used as an ethylene absorber in active packaging of fruits and vegetables?
Answer: C
The one not used as an ethylene absorber is calcium hydroxide.
Calcium hydroxide reacts with carbon dioxide to form calcium carbonate, so it is used as a CO2 absorber in packaging, for example for coffee and for produce that releases CO2. It does not remove ethylene.
Potassium permanganate oxidises ethylene and is the most common scavenger, usually carried on an inert porous support such as silica gel, alumina or zeolite in sachets. Activated carbon, often with a palladium catalyst, adsorbs and breaks down ethylene. These are standard ethylene-control materials.
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