ABSTRACTKiwifruit were analyzed for the presence of lipoxygenase (LOX) after mass‐spectrophotometric analysis of kiwifruit pulp showed the presence of hexanal and hex‐2‐enal, considered to be break‐down products of the reaction initiated by LOX. A spectrophotometric assay showed high levels of LOX when compared to other fruits and vegetables. Kiwifruit have at least one isoenzyme belonging to the class II group of LOX iso‐enzymes, similar to those identified in asparagus, cucumber, tomato and apple. The LOX required detergent‐solubilization and was partially purified. Relative to other known lipoxygenases kiwifruit LOX is heat‐stable. It catalysed the hydroperoxidation of free fatty acids but no
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