However, in this study, the titratable acidity (TA) of pineapple core extract (0.18% TA, pH 5.8) was lower that that of the peel (0.53% TA, pH 3.9) and pulp (0.41% TA, pH 4.3) extract but the core extract retarded browning of the fruit rather than the peel and pulp extracts.