It is well known that the excessive heating of food products causes considerable losses in the organoleptic quality of food. Blanching inactivates chlorophyllase and enzymes responsible for senescence and rapid loss of green color. However, chlorophyll degradation is initiated by damaged tissue during blanching and other processing steps [58, 142]. There is general agreement that the main cause of green vegetable discoloration during processing is the conversion of chlorophylls to pheophytins by the influence of pH. The green color of vegetables turns to an olive green when heated or placed in acidic conditions [50, 52]. During this reaction, hydrogen ions can transform the chlorophylls to their corresponding pheophytins by sub- stitution of the magnesium ion in the porphyrin ring [90]. The conversion of chlorophyll to pheophytin and pheo- phorbide results in a change from bright green to dull olive green or olive yellow, which is ultimately perceived by the consumer as a loss of quality [53, 151].