Ceramic membrane microfiltration for reducing nonpolar compounds in fruit juices

Overview

This technology leverages tangential microfiltration with ceramic membranes to selectively retain nonpolar aromatic compounds in fruit juices, improving sensory quality without thermal processing. The approach is based on the discovery that nonpolar compounds such as benzothiazoles and lactones—which are often responsible for rancid off-flavors—bind to suspended insoluble solids (SIS) and fouling-layer components during microfiltration. By adjusting the characteristics of these insoluble solids, the retention of unwanted aroma compounds can be modulated. The process simultaneously achieves cold pasteurization and partial deodorization, making it particularly valuable for functional beverages like noni juice and coconut water where unpleasant flavors limit consumer acceptance.

Technical specifications

Key features:

• Tangential microfiltration using ceramic membranes for cold disinfection of fruit juices
• Selective retention of nonpolar aromatic compounds (benzothiazoles, lactones) responsible for rancid flavors
• Retention gradient correlated with compound polarity—nonpolar compounds are retained to a greater degree
• Adjustable retention through modification of suspended insoluble solids (SIS), including natural extracts of cellulose and lignin
• Patented process for partial deodorization of noni juice
• Compatible with addition of probiotics for functional beverage applications
• Aroma quality assessment via untargeted GC-MS metabolomics

Technology readiness level

The technology has been validated at laboratory scale across multiple fruit juice matrices, with results published in peer-reviewed scientific literature. A patented application for partial deodorization of noni juice has been developed. The team has also supported a Costa Rican SME (Siwajuice) in commercializing microfiltered coconut water with probiotics. Future validation will proceed at a semi-industrial pilot plant to assess aroma profile changes in coconut water before and after microfiltration, including the impact of adding natural cellulose and lignin extracts to modulate retention. This next phase will determine commercial feasibility and optimize process parameters for scale-up.