Goal
Extend the shelf life of fresh produce by slowing water loss and oxidation.
Problem
Food spoilage caused by evaporative moisture loss, oxidation, mechanical damage, and biotic attack.
Concept Summary
A coating derived from plant cutin and fatty-acid esters is applied to the surface of fruits and vegetables. The coating forms a thin, invisible barrier that reduces water vapor transmission and oxygen diffusion, thereby slowing the biochemical processes that lead to spoilage.
Detailed Description
The invention isolates cutin-derived monomers, oligomers, and fatty-acid esters by treating cross-linked polyesters (naturally occurring cutin) with a strong acid and an alcohol (e.g., ethanol, methanol). After removal of the acid and alcohol, the resulting esters are applied as an edible coating to produce. The coating can be a solid powder or liquid that dries to a thin film. The process may involve heating (reflux) and neutralization steps. The coating is intended for direct application to edible substrates such as avocados, tomatoes, and other fresh produce.
Principles
- Edible barrier coating
- Chemical esterification of plant polyesters
- Control of water vapor and oxygen diffusion
Scientific Domains
Materials
- Cutin (plant polyesters)
- Fatty acid esters
- Strong acids (e.g., sulfuric acid, hydrochloric acid)
- Alcohols (ethanol, methanol, propanol, isopropanol, glycerol)
- Solvents (non-reactive secondary solvents)
Mechanisms of Action
- Physical barrier to moisture loss
- Barrier to oxygen diffusion
- Potential antioxidant activity from cutin-derived compounds
Energy Sources
Applications
- Fresh produce preservation
- Reduction of food waste
- Extended marketability of fruits and vegetables
Claimed Performance
The coating can double or possibly triple the shelf life of many types of produce.
Limitations
- Requires chemical processing (acid/alcohol treatment)
- Potential regulatory approval needed for edible coatings
- Scalability and cost not fully disclosed
