Enzymatic crosslinking of sweet proteins for improved stability
A natural enzymatic process to enhance the stability of sweet proteins (Brazzein, Monellin, Thaumatin) against extreme pH and temperature, enabling broader use in food and beverage applications.
Overview
This research introduces a natural enzymatic crosslinking approach to improve the stability of sweet proteins such as Brazzein, Monellin, and Thaumatin. By using food-grade enzymes including transglutaminase, tyrosinase, and laccase, new covalent bonds are formed within the protein structure. These bonds, which naturally occur in biological systems, are more resistant to low pH and high or low temperatures than standard peptide bonds. The result is sweet proteins with enhanced functional stability for use in challenging food and beverage formulations.
Technical specifications
Key features:
- Enzymatic crosslinking using transglutaminase, tyrosinase, and laccase to introduce non-peptide covalent bonds
- Applicable to multiple natural sweet proteins including Brazzein, Monellin, and Thaumatin
- Natural, efficient, and sustainable processing approach using food-grade enzymes
- Stability characterization at pH 2, 3, and 4 through chemical and instrumental analyses
- Sensory evaluation conducted through a dedicated sensory evaluation center to confirm sweetness retention
- Builds on existing USDA NIFA-funded expertise in enzymatic crosslinking of food proteins
Technology readiness level
The approach is at an early-to-mid research stage. The lab has prerequisite expertise from a related USDA NIFA-funded project on enzymatic crosslinking of proteins for higher stability. Future validation will involve optimizing catalysis conditions for each enzyme and protein combination, followed by characterization of pH and temperature stability and sensory evaluation. The work is positioned to advance toward practical application in food and beverage product development.
About Penn State University
Penn State University is a comprehensive public land‑grant research university with a large multi‑campus footprint across Pennsylvania. Industry engages through a research and technology park adjacent to the flagship campus that houses corporate R&D, co‑located labs, and flexible collaboration space, as well as a statewide extension network that enables field testing, demonstration, and workforce reach. Integration with a major hospital system supports clinical translation, and an applied research laboratory fosters mission‑driven partnerships with government and industry sponsors. Research is supported by competitive federal funding from agencies such as NSF, NIH, DOE, USDA, DoD, and NASA. A dedicated technology transfer office manages IP, licensing, and startup formation to accelerate commercialization.
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