In addition, the pH value of the blanching solution
changed, from about 6.2 before blanching to 4.3 after blanching.
These values decreased within the range of pH favoring zinc
complex formation suggested by LaBorde and von Elbe (1990).
Organic acids released from fruit cells during thermal heating (La-
Borde and von Elbe 1994a) would be the main explanation for this
decrease in pH values of the blanching solutions.