Many different microbes can also make cooking oils go bad. Cooking oils contain a chemical compound called triglycerides that have one glycerol molecule and three fatty acids.
Some microbes can break off the fatty acids from the triglyceride backbone. This leads to a rancid cooking oil solution. Practicing proper food safety techniques and hygiene will help prevent cooking oils from becoming rancid. The texture, color, and clearness of cooking oil may change with time. However, when the cooking oil goes bad, an awful odor and taste will be present. If a bad, wine smell or taste is developed, then the cooking oil container was probably not sealed completely.
If you feel like you need to throw up, then you can be sure that the cooking oil is rancid. Storing oils is in their original airtight containers in a dark, cool place like a pantry is the best way to store oils. An opened container of cooking oil will probably be fine in the pantry. However, many cooking oil containers will live a longer shelf life if it is refrigerated.
As previously stated, cooking oil may become cloudy in the fridge, but if left alone in room temperature for a short time before use, it will liquify quickly. Olive and other cooking oils are best left in the pantry. However, hazelnut, avocado, sesame and walnut oils should be stored in the fridge. There are many benefits of proper food storage such as: cutting food costs, eating healthier, and helping the environment by avoiding waste.
Also, avoid using plastic bottles. Plastic tends to strain chemicals over time which can affect the overall taste of cooking oil. If your oil came in a plastic bottle, then consider putting it in a glass jar or bottle with a tight-fitting lid. Avoid preserving cooking oils in containers made from copper or iron since these metals can create a chemical reaction when they come in contact with oil. It is important to know which types of oils can be stored at room temperature. The following types of oils can be stored at room temperature:.
Know which types of oils are best saved in a refrigerator. Some oils will spoil if they are not kept in a cool place. These oils should be kept in the fridge:. Avoid storing oil where it can be degraded. As previously stated, sunlight and constant temperature fluctuations can cause oil to go rancid.
Avoid keeping your cooking oil in the areas listed below:. It is important to understand that oil stays fresh for a short period of time. Cooking oil comes in two different types: refined and unrefined.
The label on the jar or bottle will reveal if the oil is unrefined or refined. Refined oils are processed. They typically have a little to no flavor or nutritional value. They will normally last six to twelve months if stored properly. Unrefined oils tend to be more nutritious and pure. They will normally last for three to six months if stored properly. For convenient use, an oil sprayer bottle is an excellent choice for storing fat. Soybean oil was the first vegetable oil used back in the s. During that period, vegetable oil was only used for cooking purposes.
But now vegetable oil is being used for many other purposes. Vegetable oil is now even more useful to cosmetics and skincare products.
Overall, vegetable oil has a lot of uses, such as it helps in making paints, perfumes, candles, etc. It is also used in baking as well as in salad dressing. Some of the commonly used vegetable oil includes canola oil , peanut butter oil, coconut oil , and olive oil. Now to the main question — does vegetable oil go bad? The answer is yes, Vegetable oil does go rancid. Almost all the edibles shelf life depends on its storage method. The shelf life of opened and unopened vegetable oil varies. So unopened vegetable oil seems to have a longer shelf life compared to open vegetable oil.
Unopened vegetable oil can last for about two years if stored properly. Keep the oil away from air and heat or store it in the kitchen pantry. However, it does not mean that it is dangerous to consume.
You can use it while cooking, but the oil will not be in its best quality. Oils like canola oil, sunflower seed oil, safflower oil, olive oil and blended vegetable oil lasts for about two years unopened. Their shelf life reduces to about a year once the bottle is opened. More delicate oils like corn oil, sesame oil and many nut oils have a shelf life of only a year unopened.
When opened, these oils will last for between four and nine months, if properly stored. Image used under Creative Commons from Mike Mozart. The most obvious sign that cooking oil has spoiled is rancidity. Rancid oil will have quite a strong unpleasant smell. You should always check your oil for rancidity before using. Consuming rancid oil can be damaging to your health in the long term, and is not recommended.
In the short time, rancid oil can cause digestive discomfort, and bring an unpleasant taste to your food.
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