Unripe apples – source of natural organic acids

Abstract

Research has focused on determining titratable acidity in unripe apples of 4 varieties: Coredana, Golden Rezistent, Rewena and Reglindis. Other physicochemical indices were also determined. These were picked between June – July 2020. The fruits were harvested during development at 45th, 58th, 71st, 84th and 97th days after the full bloom. The extract was obtained from these fruits and were determined some physicochemical indices. The titratable acidity (expressed in malic acid) in the extracts was determined by titration with NaOH (of 0.1 N).