Natural antibacterial agents to extend the shelf-life of fruits and vegetables
Lactic acid bacteria (LAB) fermentation technology producing natural antimicrobial metabolites—organic acids, GABA, and nisin—to inhibit pathogenic bacteria and extend the shelf life of fresh and minimally processed fruits and vegetables.
Overview
This technology leverages lactic acid bacteria (LAB) fermentation to generate natural antibacterial agents that inhibit pathogenic bacteria on fresh and minimally processed fruits and vegetables. The culture filtrate, containing LAB metabolites such as organic acids, gamma-aminobutyric acid (GABA), and nisin, serves as a bio-based preservative that extends shelf life while reducing reliance on synthetic chemical treatments. Prior validation on table grapes demonstrated statistically significant improvements over untreated controls, including reduced weight loss, lower decay rates, delayed maturity and senescence, and better sensory evaluations.
Technical specifications
Key features:
- LAB fermentation produces a culture filtrate rich in organic acids, GABA, and nisin
- Natural antimicrobial metabolites inhibit pathogenic bacterial colonization on produce surfaces
- Compatible with both raw and minimally processed fruits and vegetables
- Demonstrated efficacy in reducing weight loss, decay rate, and delaying senescence in table grape trials
- Supports improved sensory quality during storage
Research approach:
- Fermentation scale-up to produce sufficient filtrate volumes for application testing
- Comprehensive metabolite analysis of culture filtrate to characterize active antimicrobial compounds
- Pathogen inhibition assays to quantify antibacterial effectiveness
- Shelf-life evaluation including biochemical property analysis and sensory evaluation during storage
Technology readiness level
The technology has completed initial proof-of-concept validation, with published results confirming that LAB supernatant-treated grapes outperformed untreated controls across multiple preservation metrics. The research team is now seeking partnerships to advance scale-up fermentation, conduct expanded biochemical and sensory evaluations during storage, and fund key personnel. The proposed validation timeline is approximately one year, after which the technology will be positioned for broader pilot and commercial application development in the fresh produce industry.
About Michigan State University
Michigan State University is a major public land‑grant research university with a comprehensive academic portfolio and a large research enterprise. Industry partners engage through an on‑campus U.S. Department of Energy national user facility and shared core laboratories with user access. The university provides a chemical process scale‑up pilot plant on Michigan’s lakeshore, a research and technology park, and a Grand Rapids health innovation campus linking researchers with clinical partners. A statewide extension network supports field deployment and workforce training across Michigan’s manufacturing corridor. Research is backed by competitive federal funding from NSF, NIH, DOE, USDA, and DoD, while dedicated tech transfer and corporate engagement teams—supported by an affiliated research foundation—accelerate IP, licensing, startups, and sponsored research.
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