The dragon fruit contain betalains, which is naturally pink-red in colour. While extracting the juice of dragon fruit, the fruit juice is pink in colour. How to measure the titratable acidity through titration method, where the end point is pink in colour?
Arun Padhye
Try to include a blank and a slight change towards intense pink hue should be considered as the endpoint of titration. Also carry out titration with extreme dilution. May be 50 to 100 ml distilled water can be added to both blank and sample so as to increase the accuracy of endpoint detection. For more accuracy choose potentiometric titration method.
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