The effect of reactive gel catalysts in food packaging for extended shelf life
The effect of reactive gel catalysts in food packaging for extended shelf life
Introduction
With the rapid development of the food industry, food packaging technology is also constantly improving. Food packaging is not only to protect food from external pollution, but more importantly, to extend the shelf life of food and maintain the freshness and nutritional value of food. In recent years, reactive gel catalysts have gradually emerged in the field of food packaging as a new material. This article will introduce in detail the principles, product parameters, application effects and their extended shelf life effects in food packaging.
1. Principles of reactive gel catalysts
1.1 Basic concepts of reactive gel catalysts
Reactive gel catalyst is a catalytically active gel material that can induce or accelerate chemical reactions under certain conditions. Its unique gel structure makes it have high specific surface area, good adsorption properties and controllable catalytic activity. In food packaging, reactive gel catalysts mainly extend the shelf life of food by regulating the gas composition in the packaging, inhibiting microbial growth and delaying food oxidation.
1.2 Working principle of reactive gel catalyst
The working principle of reactive gel catalysts is mainly based on their catalytic activity center and gel network structure. The catalytic active center can react with gases or ingredients in food products to regulate gases in the packaging. The gel network structure provides good adsorption performance and can adsorb harmful gases or microbial metabolites in the packaging, thereby inhibiting the growth of microorganisms and oxidation of food.
2. Product parameters of reactive gel catalyst
2.1 Product Parameter Overview
The product parameters of reactive gel catalysts mainly include catalytic activity, gel strength, adsorption performance, thermal stability and biocompatibility. These parameters directly affect their application effect in food packaging.
2.2 Detailed explanation of product parameters
2.2.1 Catalytic activity
Catalytic activity is the core parameter of reactive gel catalysts, which determines its ability to regulate gas composition in the packaging. Catalytic activity is usually measured by the rate of catalytic reactions per unit time in mol/(g·h).
| Catalytic Activity Level | Catalytic rate (mol/(g·h)) |
|---|---|
| Low | 0.1-1.0 |
| in | 1.0-10.0 |
| High | 10.0-100.0 |
2.2.2 Gel Strength
Gel strength reflects the mechanical properties of the reactive gel catalyst, which determines its stability and durability in packaging. Gel strength is usually measured by compression modulus in MPa.
| Gel Strength Level | Compression Modulus (MPa) |
|---|---|
| Low | 0.1-1.0 |
| in | 1.0-10.0 |
| High | 10.0-100.0 |
2.2.3 Adsorption properties
Adsorption performance is an important parameter of reactive gel catalysts and determines its ability to adsorb harmful gases or microbial metabolites in the packaging. Adsorption performance is usually measured by adsorption capacity in units of mg/g.
| Adsorption performance level | Adsorption capacity (mg/g) |
|---|---|
| Low | 10-100 |
| in | 100-1000 |
| High | 1000-10000 |
2.2.4 Thermal Stability
Thermal stability reflects the stability of the reactive gel catalyst in high temperature environments and determines its applicability in food processing and storage. Thermal stability is usually measured by the thermal decomposition temperature in °C.
| Thermal Stability Level | Thermal decomposition temperature (°C) |
|---|---|
| Low | 100-200 |
| in | 200-300 |
| High | 300-400 |
2.2.5 Biocompatibility
Biocompatibility reflects reactive gel inducedThe safety of the chemical agent when in contact with food determines its application scope in food packaging. Biocompatibility is usually measured by cytotoxicity assays in cell survival (%).
| Biocompatibility level | Cell survival rate (%) |
|---|---|
| Low | 50-70 |
| in | 70-90 |
| High | 90-100 |
3. The application effect of reactive gel catalyst in food packaging
3.1 Adjust the gas composition in the packaging
Reactive gel catalysts can adjust the gas composition in the packaging through catalytic reactions, thereby extending the shelf life of food. For example, by catalyzing the reaction of oxygen with ingredients in food, the oxygen concentration in the packaging is reduced, thereby delaying the oxidation of food.
| Food Type | Oxygen concentration in the package (%) | Shelf life extension effect (%) |
|---|---|---|
| Meat | 0.5-1.0 | 20-30 |
| Vegetables | 1.0-2.0 | 15-25 |
| Fruit | 2.0-3.0 | 10-20 |
3.2 Inhibition of microbial growth
Reactive gel catalysts can inhibit the growth of microorganisms by adsorbing harmful gases or microbial metabolites in the packaging, thereby extending the shelf life of food. For example, by adsorbing carbon dioxide in the package, the growth rate of microorganisms is reduced.
| Food Type | Carbon dioxide concentration in the packaging (%) | Shelf life extension effect (%) |
|---|---|---|
| Meat | 5-10 | 25-35 |
| Vegetables | 10-15 | 20-30 |
| Fruit | 15-20 | 15-25 |
3.3 Delaying food oxidation
Reactive gel catalysts can delay oxidation of food through catalytic reactions, thereby extending the shelf life of food. For example, by catalyzing the reaction of unsaturated fatty acids in foods with oxygen, the oxidation rate of foods is reduced.
| Food Type | Oxidation rate (mg/g·h) | Shelf life extension effect (%) |
|---|---|---|
| Meat | 0.1-0.5 | 30-40 |
| Vegetables | 0.5-1.0 | 25-35 |
| Fruit | 1.0-2.0 | 20-30 |
IV. Practical application cases of reactive gel catalysts in food packaging
4.1 Meat Packaging
In meat packaging, reactive gel catalysts inhibit microbial growth and delay meat oxidation by adjusting the oxygen and carbon dioxide concentrations in the packaging, thereby significantly extending the shelf life of meat.
| Meat Type | Oxygen concentration in the package (%) | Carbon dioxide concentration in the packaging (%) | Shelf life extension effect (%) |
|---|---|---|---|
| Beef | 0.5-1.0 | 5-10 | 30-40 |
| Pork | 1.0-2.0 | 10-15 | 25-35 |
| Chicken | 2.0-3.0 | 15-20 | 20-30 |
4.2 Vegetable packaging
In vegetable packaging, reactive gel catalysts inhibit microbial growth and prolongation by adjusting the oxygen and carbon dioxide concentrations in the packagingSlows the oxidation of vegetables, thereby significantly extending the shelf life of vegetables.
| Vegetable Types | Oxygen concentration in the package (%) | Carbon dioxide concentration in the packaging (%) | Shelf life extension effect (%) |
|---|---|---|---|
| Spinach | 1.0-2.0 | 10-15 | 20-30 |
| Carrot | 2.0-3.0 | 15-20 | 15-25 |
| Tomatoes | 3.0-4.0 | 20-25 | 10-20 |
4.3 Fruit Packaging
In fruit packaging, the reactive gel catalyst inhibits the growth of microorganisms and delays the oxidation of fruits by adjusting the oxygen and carbon dioxide concentrations in the packaging, thereby significantly extending the shelf life of the fruit.
| Fruit Type | Oxygen concentration in the package (%) | Carbon dioxide concentration in the packaging (%) | Shelf life extension effect (%) |
|---|---|---|---|
| Apple | 2.0-3.0 | 15-20 | 20-30 |
| Banana | 3.0-4.0 | 20-25 | 15-25 |
| Grapes | 4.0-5.0 | 25-30 | 10-20 |
V. Future development direction of reactive gel catalysts
5.1 Improve catalytic activity
In the future, one of the research and development directions of reactive gel catalysts is to improve their catalytic activity, thereby further improving their application effect in food packaging. By optimizing the composition and structure of the catalytic active center, higher catalytic rates and lower reaction temperatures can be achieved.
5.2 Enhance gel strength
Enhance the gel strength of the reactive gel catalyst can improve theIts stability and durability in packaging. By optimizing the gel network structure, higher compression modulus and better mechanical properties can be achieved.
5.3 Improve adsorption performance
Improving the adsorption performance of reactive gel catalysts can further improve their application effect in food packaging. By optimizing the distribution and number of adsorption sites, higher adsorption capacity and faster adsorption rate can be achieved.
5.4 Improve thermal stability
Improving the thermal stability of reactive gel catalysts can expand its application range in food processing and storage. By optimizing the heat resistance of the material, higher thermal decomposition temperatures and better thermal stability can be achieved.
5.5 Improve biocompatibility
Improving the biocompatibility of reactive gel catalysts can ensure their safety in food packaging. By optimizing the biocompatibility of the material, higher cell survival and better biocompatibility can be achieved.
Conclusion
Reactive gel catalysts, as a new material, have wide application prospects in food packaging. By regulating the gas composition in the packaging, inhibiting microbial growth and delaying food oxidation, reactive gel catalysts can significantly extend the shelf life of food. In the future, with the continuous advancement of reactive gel catalyst technology, its application effect in food packaging will be further improved, providing strong support for the development of the food industry.
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