Pectin methylesterase activity and ascorbic acid content from guava fruit, cv. Predilecta, in different phases of development.

The guava pectin methylesterase (PME) specific activity and vitamin C were assayed in samples from different phases of guava fruit development. The PME enzyme from guava was extracted with borate-acetate buffer, 50 mol/l, pH 8.0, in the presence of NaCl 0.