Determination of ascorbic acid in soft drinks and fruit juices. Part 2. Applicability of direct ultraviolet spectrophotometry with background correction

Abstract

The applicability of the proposed analytical procedure was investigated and the results indicated that it has a good repeatability and could be used over a wide working range. The interference effects of 50 fruit juice components were studied individually and collectively in suitable combinations as soft drink bases. No significant interferences were observed for most of the samples tested. The reliability of the method was established statistically by parallel determinations against established methods. The method was found to be applicable to most fruit juices and soft drinks except those that were unstable to alkaline treatment, had fine particles, were deeply coloured or contained high concentrations of caffeine, saccharin, caramel and tannic acid.