Ascorbic Acid/Citric Acid Combinations in the Processing of Frozen Apple Slices CHARLES R. SANTERRE, J. N. CASH, and D. J. VANNORMAN ABSTRACT Sulfite replacement was investigated in a commercial apple freezing operation: Jonathan and Spy apple slices were vacuum:~mpregnatc~ in 0.5% or 1% ascorbic acid &AA) or D-araboascorbic acid (DAA). 0.25% or 0.5% citric acid (CA), 2h NaCl, and 0.25% CaCI,: Tread: ments with DAA gave color and sensory properties equal to LAA treatments. Slice color was not significantly diffcrcnt bctwccn 0.5% and 1.0% ascorbic acid isomers and 0.25% or 0.5% CA. Shear mca- surements of Jonathan slices wcrc significantly influenced by DAA and citric acid concentrations. Texture of Spy slices was not affected by treatment or storage. This study indicates that DAA may be sub- stituted for more expensive LAA for treating Spy and Jonathan slices prior to freezing.