Abstract:

Objective: To choose an appropriate method to measure sodium benzoate(SB)and potassium sorbate(PS) in the fruitflavored beverages. Method: The content of SB and PS in the fruit-flavored beverages were determined by multiwavelength linear regression and iso-absorptive point double-wavelength UV spectrophotometry, and the performance of the two methods were compared. Results: Recovery of PS and SB by multiwavelength linear regression spectrophotometry was 99.75%－100.9% and 99.16%－101.1% respetively, and recovery of PS and SB by iso-absorptive point double-wavelength was 98.58%－99.38% and 98.42%－99.56% respetively. Conclusion: Multiwavelength linear regression is more suitable method to measure SB and PS in the fruit-flavored beverages.

Key words: multiwavelength linear regression, iso-absorptive point, ultraviolet spectrophotometry, sodium benzoate, potassium sorbate, fruit-flavored beverages