Edible curcuminoid-stevia nanoparticles for stable sweetener delivery in acidic beverages

Overview

This solution leverages the natural self-assembly of curcuminoids and stevia into edible colloidal nanoparticles that remain stable and optically clear in acidic beverages at pH 2. At low pH, curcuminoids reach their most hydrophobic state, meaning only a small quantity is required to drive assembly and minimize impact on taste. The resulting nanoparticles are designed to dissolve when they encounter the higher temperature and pH of the tongue, releasing the stevia sweetener where it is needed. By tuning the stevia-to-curcuminoid ratio and controlling aggregate size, the system aims to deliver sweetness without compromising beverage clarity.

Technical specifications

• Self-assembly mechanism: Curcuminoids and steviol glycosides co-assemble through hydrophobic interactions; steviol's hydrophobic core enables association with other hydrophobic species in solution.
• pH-responsive behavior: Nanoparticles remain as a stable colloidal dispersion at pH 2 and dissolve upon a pH and temperature shift, enabling controlled sweetener release on the tongue.
• Optical clarity: Aggregate size is controlled to maintain transparency in the final beverage.
• Minimal taste impact: Low curcuminoid loading at acidic pH reduces flavor interference.
• Potential stability benefits: Intermolecular interactions between curcuminoids and stevia may help protect stevia from degradation under temperature and acidic pH stresses.
• Characterization toolkit: Holographic microscopy, turbidometry, electron microscopy, dynamic light scattering, NMR, mass spectrometry, liquid chromatography, and UV-vis spectrophotometry to validate colloidal stability, dissolution behavior, release kinetics, and degradation profiles.

Technology readiness level

The concept is at an early research stage, building on the lab's prior expertise in colloidal self-assembly. The proposed grant will fund the first round of hypothesis validation. Outstanding work includes characterizing colloidal stability as a function of pH and pressure (such as during can opening), confirming dissolution upon contact with a higher-pH, higher-temperature surface, quantifying stevia release from the nanoparticles, and measuring degradation under relevant storage and processing conditions. Further development and formulation work would be needed before commercial deployment.