Cellulose Nanomaterial Coatings for Fruit Moisture Barrier
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Solution Overview
Problem
There is a need for improved compositions and coatings that can enhance the shelf-life and pre-harvest integrity of perishable foods, as existing technologies face challenges such as insufficient moisture and gas barrier, and poor adhesion onto fruit surfaces.
Innovation Solution
The development of a coating composition comprising cellulose nanomaterials, such as cellulose nanocrystals or nanofibrils, combined with an emulsion system including a hydrophobic agent like oleic acid and a surfactant like sucrose ester of a fatty acid, which can be used to coat food items like bananas, improving their storage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing coating technologies are used on fruit surfaces, then some level of protection is provided, but the coating suffers from insufficient moisture and gas barrier properties and poor adhesion
Solution Approach 1:
The patent employs a composite coating system combining cellulose nanomaterials (CNC or CNF) with hydrophobic agents (fatty acids) and surfactants. This composite approach creates a coating that simultaneously provides excellent moisture and gas barrier properties while maintaining good adhesion to fruit surfaces, resolving the contradiction between reliability and complexity by integrating multiple functional components into a unified system
Solution Approach 2:
The patent modifies the chemical and physical parameters of the coating composition by adjusting the molecular weight, degree of crystallinity, and surface chemistry of the cellulose nanomaterials. These parameter changes enable the coating to achieve optimal barrier properties and adhesion characteristics without requiring overly complex formulation approaches
2Reliability
If existing coating technologies are used on fruit surfaces, then some level of protection is provided, but the coating suffers from poor adhesion onto fruit surfaces
Solution Approach 1:
The patent introduces surfactants as intermediary substances that facilitate adhesion between the hydrophilic cellulose nanomaterials and the hydrophobic fruit surface. The surfactant acts as a molecular bridge, with its amphiphilic structure allowing it to interact with both the coating matrix and the fruit surface, thereby improving adhesion without significantly increasing formulation complexity
Solution Approach 2:
The patent adjusts the surface energy and chemical composition parameters of the coating by incorporating fatty acids and surfactants. These parameter modifications enable the coating to match the surface properties of the fruit, improving wetting and adhesion characteristics through controlled changes in the coating's interfacial properties
3Duration of action of stationary object
If bananas are left uncoated, then they maintain natural properties, but they suffer from short shelf-life due to physiological disorder, postharvest diseases, and senescence
Solution Approach 1:
The patent applies a protective coating to bananas before they are subjected to storage conditions that would normally cause physiological disorders and senescence. This preliminary protective action creates a barrier that prevents water loss, reduces gas exchange, and blocks pathogen entry, thereby counteracting the harmful effects of storage before they can occur
Solution Approach 2:
The patent uses a thin film coating composed of cellulose nanomaterials that forms a flexible protective shell around the banana surface. This thin film is sufficient to provide barrier protection against moisture loss and gas exchange while remaining permeable enough to allow the fruit to breathe, thereby extending shelf-life without causing physiological stress
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed coating composition effectively delays ethylene biosynthesis, reduces chlorophyll degradation, and minimizes weight loss and firmness loss in bananas, thereby enhancing their marketability and storability during ambient storage.
Implementation Method 1
an emulsion system, comprising a hydrophobic agent (e.g., a fatty acid) and a surfactant
Implementation Method 2
The coating compositions can be used to coat a foodstuff, such as a plant or plant part
Implementation Method 3
a hydrophobic agent (e.g., a fatty acid)
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Disclosed herein are embodiments of a coating composition comprising cellulose nanomaterials and emulsion systems. The coating compositions provide improved moisture barrier and wettability onto fruit surfaces and can control physiological activity and enhance storability of food products, such as fruits during ambient storage. Also disclosed herein are embodiments of dried and substantially dried coatings, films, products made with the coating compositions, and methods of making and using the coating compositions described herein.