pH has an important effect on pigments (e.g., chloro- phyll, carotenoids, anthocyanins, myoglobin, etc.) respon- sible for the color of fruits, vegetables and meats. The color compounds of processed fruits and vegetables can change during processing due to the presence of microorganism and the inactivation or not of enzymes, which can result in undesired chemical reactions (both enzymatic and non- enzymatic) in the food matrix.