Tunable zwitterionic membranes for selective removal of flavor compounds

Overview

This solution offers tunable zwitterionic membranes designed for the selective removal of specific flavor compounds from coconut water. The technology addresses a key challenge in beverage processing: separating low-molar-mass solutes efficiently while resisting fouling from high-organic-content feeds.

The membranes are based on cross-linkable zwitterionic amphiphilic copolymers (cZACs). By customizing the copolymer composition, degree of cross-linking, and incorporation of charged groups, manufacturers can precisely tune the molecular weight cut-off (MWCO) and surface charge of each membrane. This enables selective separation of target flavor compounds based on both size and chemical interactions, offering a simple and energy-efficient alternative to conventional separation methods.

Technical specifications

Key features:

• Tunable molecular weight cut-off: Rejection of organic compounds can be adjusted by changing copolymer composition and cross-linking degree, with demonstrated sucrose rejection ranging from less than 25% to over 99.7%
• Charge-based selectivity: Incorporation of anionic groups enables tuning of salt rejection from less than 10% to over 95%, expanding separation capabilities beyond size-based filtering alone
• Fouling resistance: ZAC and cZAC membranes completely resist irreversible fouling even with challenging, high-organic-content feeds
• Scalable fabrication: The membrane platform is designed for scalable manufacturing
• Customizable selectivity: Membrane compositions can be matched to specific solute structures based on MWCO, charge, and chemical differences

Technology readiness level

The technology has been validated through laboratory demonstrations showing tunable rejection of organic compounds and salts across wide ranges. Cross-linked zwitterionic membranes with anionic groups have been confirmed to achieve variable NaCl rejection, and all membrane variants have demonstrated complete resistance to irreversible fouling.

Future validation will involve identifying key solutes in collaboration with industry partners, screening the most promising cZAC membrane compositions, and testing separation performance and fouling propensity using both synthetic mixtures and actual coconut water samples. A startup commercializing ZAC membranes for water treatment will provide feedback on scalability and potential commercialization pathways.