Preservatives possess antimicrobial activity, which makes them suitable for use in various food products to inhibit the growth of yeasts, molds, and bacteria. Among them, sorbates and benzoates are the most widely used preservatives, particularly in soft drinks and other beverages.
Permitted Levels of Food Additives
The permissible levels of food additives are regulated by specific safety standards that define the maximum allowable concentrations (MPLs) for each food category. When used beyond these limits, preservatives may pose potential health risks. Reported side effects from excessive exposure include metabolic acidosis (an imbalance between acids and bases in body fluids), seizures, and allergic reactions, as observed in both animal studies and human cases.
Sweeteners
The increasing prevalence of obesity in developed countries and growing awareness of high-calorie diet risks have driven widespread adoption of artificial sweeteners. Additionally, the global rise in diabetes prevalence has further contributed to the use of these sugar substitutes. Saccharin, one of the earliest artificial sweeteners, is approved for use in the European Union and is commonly added to soft drinks. The Scientific Committee on Food (SCF) has set its acceptable daily intake (ADI) at 0–5 mg/kg body weight.
To ensure food safety, the European Commission, following recommendations by the European Food Safety Authority (EFSA), has issued three major directives regulating the maximum permitted levels (MPLs) of sweeteners, colors, and miscellaneous additives. Member States are required to report annual usage data for all authorized additives. EFSA assigns an Acceptable Daily Intake (ADI) to each approved additive — defined as the amount that can be consumed daily over a lifetime without appreciable health risk. MPLs are established to prevent intake beyond these safety limits. Although some animal studies have linked saccharin to bladder cancer in male rats, no conclusive evidence has been found associating ADI-level saccharin consumption with cancer in humans.
Caffeine
Caffeine is a trimethylxanthine compound and remains one of the most widely consumed psychoactive substances globally. It also serves as a flavoring component, present in approximately 70% of carbonated beverages in the United States. While moderate caffeine intake is generally safe, excessive consumption may lead to adverse health effects. Studies highlight the importance of consumer awareness regarding caffeine content in beverages and recommend monitoring average daily caffeine intake. A reliable analytical method for determining benzoic acid, sorbic acid, caffeine, and saccharin in soft drinks and nectars is High-Performance Liquid Chromatography (HPLC) combined with UV detection.
