Antioxygen
Chemical Additives 2025-03-18
Antioxidants: Protection Against Oxidation
1. Definition & Function
- Antioxidants are compounds that inhibit oxidation, preventing damage caused by free radicals and reactive oxygen species (ROS).
- They work by:
- ✅ Scavenging free radicals (chain-breaking antioxidants).
- ✅ Chelating metal ions that catalyze oxidation (e.g., iron, copper).
- ✅ Enhancing stability of food, fuels, plastics, and biological systems.
2. Key Mechanisms
| Mechanism | Example | Effect |
|---|---|---|
| Free Radical Scavenging | Vitamin E, BHA, BHT | Terminates lipid peroxidation chain reactions. |
| Oxygen Consumption | Ascorbic acid (Vitamin C) | Reduces available oxygen in food packaging. |
| Metal Chelation | EDTA, Citric acid | Prevents metal-catalyzed oxidation. |
3. Types of Antioxidants
| Type | Examples | Applications |
|---|---|---|
| Natural Antioxidants | Vitamin E, Polyphenols (e.g., flavonoids), Carotenoids | Food preservation, cosmetics, supplements. |
| Synthetic Antioxidants | BHA, BHT, TBHQ | Processed foods, oils, petrochemicals. |
| Enzymatic Antioxidants | Superoxide dismutase (SOD), Catalase | Biological systems (cellular protection). |
4. Applications
- Food Industry
- Prevents rancidity in oils, snacks, and meat products.
- Extends shelf life (e.g., BHA in cereals, rosemary extract in natural foods).
- Plastics & Fuels
- Protects polymers and lubricants from oxidative degradation.
- Cosmetics & Pharmaceuticals
- Stabilizes creams, serums, and drugs against oxidation.
- Health Supplements
- Vitamin C, E, and CoQ10 combat oxidative stress in the body.
5. Safety & Regulations
- FDA/EFSA-Approved Antioxidants: BHA, BHT, Tocopherols (subject to usage limits).
- Restrictions: Some synthetic antioxidants (e.g., TBHQ) have maximum permitted levels.
- Natural Alternatives: Growing demand for plant-derived antioxidants (e.g., rosemary extract, green tea polyphenols).
6. Benefits of Proper Use
- For Food Manufacturers:
- Longer shelf life → Reduced food waste & economic losses.
- For Consumers:
- Improved food safety & nutritional quality.
