High-intensity sweeteners: what formulators need to know
This article continues our series on sweeteners based on the professional reference book All About Sweeteners. High-intensity sweeteners are not interchangeable: they differ in origin, sweetness potency, temporal profile, aftertaste, interactions and process stability.
Origin and regulatory status
Many high-intensity sweeteners are produced by chemical synthesis. Others, including thaumatin and steviol glycosides, can be obtained from plant-derived raw materials using physical, enzymatic or microbiological processes.
“Natural sweetener” is not a universal legal category, so origin claims should always be checked against the regulations applicable to the target market.
Sweetness potency depends on concentration
High-intensity sweeteners can be many times sweeter than sucrose, but a single potency number can be misleading. Relative sweetness changes with concentration and product matrix. At higher concentrations, perceived sweetness often increases less rapidly and may reach a plateau.
For meaningful comparison, sweetness potency should therefore be linked to the concentration range and application in which it was measured.
Sweetness profile and aftertaste
Sucrose has a familiar onset and decay curve. Many high-intensity sweeteners develop sweetness later and persist longer. Some can also introduce bitter, salty, metallic, medicinal, menthol-like or licorice-like aftertastes.
These effects can often be reduced through optimized dosage, blending and qualitative synergy between sweeteners and other ingredients.
Synergy
High-intensity sweeteners can act synergistically with one another and with polyols, bulking agents or residual sugars. Well-designed blends can improve economics while creating a sweetness curve closer to the sensory reference of sugar.
Interaction with flavor
Sweeteners can change how flavors are perceived. For example, aspartame is often associated with enhanced fruit and berry profiles, while neotame can influence fruit, mint, cinnamon and vanilla notes. The magnitude of the effect depends on the matrix and formulation, so sensory validation is essential.
Technological stability
Hydrolytic stability. This is particularly important in soft drinks, where the pH may be around 3. Acesulfame K, neohesperidin dihydrochalcone, sodium cyclamate and steviol glycosides are generally regarded as relatively stable in acidic aqueous systems.
pH stability. Most permitted high-intensity sweeteners are usable across a broad food-relevant pH range, but formulation-specific testing remains necessary.
Thermal stability. Many sweeteners tolerate common processing conditions well. Aspartame is more heat-sensitive and may lose functionality during severe thermal processing.
Maillard reactivity. Peptide sweeteners such as aspartame and alitame may participate in reactions that reduce sweetening performance under certain conditions.
Light and storage stability. Stability varies by compound. Dry sweeteners generally have good shelf stability when stored under the conditions specified by the supplier.
Sugar reduction with WM
Reducing sugar is a formulation problem, not simply an ingredient substitution. WM develops sweetening systems with consideration for legislation, product matrix, sensory profile, processing conditions and target cost.