Yes, you can put olive oil in a plastic bottle, and many commercial olive oil brands utilize dark plastic for packaging to limit light exposure. However, for optimal preservation of olive oil's quality, flavor, and beneficial properties, plastic bottles are generally not the most effective choice for long-term storage.
Understanding Olive Oil Degradation
Olive oil is susceptible to degradation from several factors, primarily light, heat, and air (oxygen). These elements can accelerate the process of oxidation, leading to rancidity, a loss of flavor, and a decrease in its healthy compounds. To delay this process, it's crucial to store olive oil in containers that offer maximum protection.
Commercial brands often package olive oil in materials like opaque metal, dark plastic, and tinted glass. While dark plastic helps block light, studies indicate that plastic bottles, especially those made with polyethylene, are less effective at protecting olive oil from oxidation compared to other materials. This means that olive oil stored in plastic may degrade more quickly over time, even if the plastic is dark. The permeability of some plastics can also allow more air to interact with the oil, further contributing to oxidation.
Optimal Containers for Olive Oil Storage
To ensure your olive oil stays fresh and flavorful for as long as possible, selecting the right storage container is key. Here are the preferred options:
- Dark Glass Bottles: Tinted or dark-colored glass (such as green or amber) is an excellent choice as it effectively blocks harmful UV rays that accelerate oxidation. Glass is also non-reactive and does not leach chemicals into the oil.
- Stainless Steel Containers: Opaque and durable, stainless steel completely blocks light and is non-reactive. These are often used for bulk storage or in professional kitchens.
- Ceramic Crocks: Similar to stainless steel, ceramic crocks are opaque, protect against light, and can help maintain a stable temperature. They also offer an aesthetic appeal for countertop storage.
Comparative Look at Olive Oil Containers
| Container Type | Pros | Cons | Best Use Case |
|---|---|---|---|
| Dark Plastic | Lightweight, less prone to breaking, blocks some light | Less effective at preventing oxidation (e.g., polyethylene), potential for air permeation | Short-term commercial packaging, quick consumption |
| Dark Glass | Excellent light protection, non-reactive | Heavier, breakable | General household storage, daily use |
| Stainless Steel | Completely opaque, durable, non-reactive, airtight | Can be harder to gauge oil level | Bulk storage, long-term preservation, professional |
| Ceramic | Opaque, good temperature insulation, often aesthetically pleasing | Heavier, breakable, can be costly | Decorative storage, countertop, moderate-term storage |
Practical Tips for Storing Olive Oil
Beyond the container material, proper storage conditions significantly impact olive oil's shelf life:
- Keep it Cool and Dark: Store olive oil in a pantry, cupboard, or another cool, dark place. Avoid locations near heat sources like stoves, ovens, or sunny windows. Heat is a major catalyst for rancidity.
- Seal Tightly: Always ensure the bottle or container is tightly sealed after each use. Minimizing air exposure is crucial for preventing oxidation.
- Avoid Clear Containers: If you purchase olive oil in a clear plastic or glass bottle, consider transferring it to an opaque container for long-term storage, especially if you won't use it quickly.
- Buy Appropriate Sizes: Purchase olive oil in sizes you'll use within a reasonable timeframe (typically 6-12 months after opening) to ensure freshness.
By understanding how different materials and conditions affect olive oil, you can make informed decisions to preserve its quality and enjoy its full benefits.
