Case Studies

Potassium permanganate as an ethylene absorbent in polyethylene bags to delay ripening of bananas during storage

KJ Scott, WB McGlasson and EA Roberts

Abstract
Potassium permanganate reduced the concentration of ethylene and calcium hydroxide reduced the concentration of carbon dioxide in sealed polyethylene bags containing bananas. When the fruit that were not packed in sealed bags were ripe (16 days after the beginning of storage) all the fruit in sealed polyethylene bags were in a firm green condition and there was little difference between treatments in sealed polyethylene bags. After 29 days some of the fruit in sealed bags had softened, but fruit in bags containing potassium permanganate was firmer than fruit receiving other treatments, and this effect was more marked after 38 days. It was estimated that about two weeks additional storage life was obtained by packing potassium permanganate with the fruit.


Australian Journal of Experimental Agriculture and Animal Husbandry 10 (43) 237 - 240 Full text doi: 10.1071/EA9700237



Picture Source: UC Davis (USA)




Citrus

Navel Orange stored at 2°C (35°F) for 42 days in cooler then transferred to 20ºC (68°F) for 7 days With (right) and Without (left) Potassium Permanganate air purifier. Source: IATA



Citrus II

Nules Clementine stored 56 days at 2°C and transferred to 20 C for 7 days With (right) and Without (left) Potassium Permanganate air purifier. Source: IATA




Citrus III

Valencia Late Orange stored 4 months at 2°C (35°F) With (right) and Without (left) Potassium Permanganate air purifier. Source: IATA




Banana

Dwarf Cavendish Banana stored at 13°C (55°F) for 25 days with (left) and without (right) Ethylene Absorbent




Strawberries

Strawberries stored 5 days in cooler at 4°C (39°F) with (left) and without (right) Potassium Permanganate + Activated Carbon air purifier. Source: PhD V. Del Valle




Strawberries II

Strawberries stored 13 days in cooler at 4°C (39°F) with (left) and without (right) Potassium Permanganate + Activated Carbon air purifier. Source: PhD V. Del Valle