Articles

THE POTENTIAL OF HOT WATER AND MOLYBDENUM DIPS TO INDUCE A SYNERGISTIC SUGAR-ASCORBIC ACID INTERACTION IN LEMON RIND DURING COLD STORAGE

Article number
934_121
Pages
905 – 910
Language
English
Abstract
Lemon fruit are sensitive to low temperature during cold storage, resulting in potential chilling injury.
This is particularly so where cold sterilization for phyto-sanitary purpose is required.
It has been reported that sugars in the rind play a role in stabilizing proteins and membranes under chilling conditions.
Ascorbic acid has been found to be major antioxidant during cold storage and can be produced from glucose.
Previous results have indicated that a combination of hot water (HWD) and molybdenum dips (Mo) has potential to mitigate chilling injury.
The purpose of this work was to investigate if sugars and ascorbic acid concentrations can be altered by such treatments and if there is a synergistic interaction between sugars and ascorbic acid during cold storage as a mechanism to enhance chilling resistance.
Fruit were obtained from two growing regions during the 2007 and 2008 growing seasons.
Treatments included HWD at 47 and 53°C for 2 min and 1 and 10 µM Mo for 30 min.
Fruit were then stored at -0.5°C for up to 28 days and evaluated weekly for chilling injury.
Sugars and ascorbic acid were extracted and analyzed by HPLC. The dominant sugar found was glucose, which was higher in fruit without chilling symptoms.
Hot water at 53°C and molybdenum resulted in a decrease in glucose content which was coupled by a slight increase in ascorbic acid concentration at 21 days of cold storage.
Fruit source also played a significant role in the sugar-ascorbic acid relationship and chilling susceptibility of lemon during cold storage.

Publication
Authors
J.P. Bower, N. Mathaba , I. Bertling
Keywords
ascorbic acid, chilling injury, Citrus limon, glucose, hot water, molybdenum
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