Kokumi-enhanced cocoa: reducing bitterness through enzymatic hydrolysis and polyphenol conjugation
This innovative approach uses gamma-glutamyl transferase enzymes and protein-polyphenol conjugation to reduce bitterness in alkalized cocoa. The method enhances flavor profiles while maintaining functional properties, promising improved consumer acceptance and sensory experiences.
Overview
Kokumi-enhanced cocoa is an innovative solution aimed at improving the sensory profile of alkalized cocoa by reducing its inherent bitterness. This approach leverages the enzymatic activity of gamma-glutamyl transferase (GGT) and protein-polyphenol conjugation to achieve a more palatable and enjoyable cocoa product. By binding and modifying bitter compounds through enzymatic reactions, this method not only mitigates bitterness but also maintains the functional properties of cocoa. The result is a cocoa product with enhanced flavors that appeal to consumer preferences.
Technical specifications
- Gamma-glutamyl transferase (GGT) activity: Modifies bitter peptides by transferring gamma-glutamyl groups, altering their structure and taste perception.
- Protein-polyphenol conjugation: Utilizes proteins to bind and mask bitter polyphenols and peptides, reducing their sensory impact.
- Peptide preparation and characterization: Involves enzymatic hydrolysis and conjugation to generate gamma-glutamyl peptides, confirmed via LC Mass Spectrometry and in-vitro receptor activation assays.
- Prototype development: Modified cocoa undergoes drying and roasting, with volatile profiles analyzed using GC-MS and taste profiles screened through an electronic tongue system.
Technology readiness level
The technology is currently at TRL 4, indicating that it has been validated in a laboratory environment. Further development will involve prototype testing and potential human sensory evaluations to optimize formulations and validate taste perceptions.
About AgResearch
AgResearch is a New Zealand government research organization focused on the agricultural sector; formerly an independent Crown Research Institute, since July 1, 2025 it has operated as a group within the Bioeconomy Science Institute. With major campuses co‑located at Lincoln University and near Massey University, and shared spaces with FoodHQ partners, industry teams can access specialized labs and collaborative project space. Company‑owned research farms nationwide enable field validation and scale‑up alongside commercial partners. Research is supported by New Zealand Government investment through MBIE programmes such as the Strategic Science Investment Fund and National Science Challenges, complemented by competitive grants and contract research. A dedicated commercialisation team manages IP, patents, licensing, and MVP development, and connects through national commercialisation networks.
delivered to your inbox.