What conditions are favourable for plant oil storage？

Properly stored, cooking oil can last for a long time. However, incorrectly stored oil can quickly turn rancid, even before its expiration date. This article will show you how to store your cooking oil, including covering which containers to use, where to keep it, and for how long. It will also explain how to tell if your cooking oil has gone rancid.

Oil tank

Methods One:Using the Right Container
Keep the cap or lid on the oil bottle when you are not using it. One of the main causes of oil turning rancid is exposure to too much oxygen. When you are not using the oil, keep the cap or lid on the container.

Methods Two:Storing Cooking Oil Properly

Be familiar with which types of oils can be stored at room temperature. The following types of oils can be kept at room temperature:

    Ghee oil can last for several months.
    Palm oil can last for several months.
    Peanut oil (refined) will last for two years.
    Vegetable oil can last for a year or longer as long as it is tightly covered.
    Olive oil may be kept in the cupboard (at temperatures between 57°F and 70ºF (14°C and 21ºC) for up to 15 months.

Store the oil in a cool, dark cupboard or pantry. Do not store it near or above the stove. The frequent temperature changes will cause the oil to deteriorate.

Know which types of oils are best stored in the refrigerator. Some oils will spoil if they are not kept in a cold place. Refrigeration will cause most oils to turn cloudy and thick. Because of this, you will need to take the oil out one to two hours before you need it, and let it sit at room temperature, allowing the oil to return to its usual consistency. The following oils should be kept in the fridge:

    Avocado oil will last for 9 to 12 months.
    Corn oil will last up to 6 months.
    Mustard oil will last 5 to 6 months.
    Safflower oil will last for 6 months.
    Sesame oil will last for 6 months.
    Truffle oil will last for 6 months.

Know which oils can be stored at both room temperature or in the fridge. Some oils can be kept either in the fridge or in the cupboard. However, in most cases, refrigeration will prolong the oil's shelf life. Note that refrigeration will cause some oils to turn thick and cloudy. If this happens, take the oil out of the fridge one to two hours before you need it, allowing it to return to its usual consistency. The one exception to this is coconut oil, which is solid at room temperature. The following oils can be kept either in the fridge or in a cool, dark cupboard:

    Canola oil can be stored in the cupboard for 4 to 6 months, or in the fridge for 9 months.
    Chili oil can be stored in the cupboard for 6 months. It will last longer in the fridge.
    Coconut oil can be stored in the cupboard for months. It can last longer in the fridge but is difficult to use quickly from the refrigerator.
    Grapeseed oil can be stored in the cupboard for 3 months (up to 70ºF/21ºC), or in the fridge for 6 months.
    Hazelnut oil can be stored in the cupboard for 3 months. It will last in the fridge for up to 6 months.
    Depending on the type, lard can be stored either in the cupboard or in the fridge. Read the label for proper storing techniques.
    Macadamia nut oil can be stored in the cupboard for up to two years. It can last even longer in the fridge.
    Palm kernel oil can be stored in the cupboard for up to a year. It can last longer in the fridge.
    Walnut oil can be stored in the cupboard for 3 months. It will last in the fridge for up to 6 months.

Avoid storing oil where it can be damaged. Sunlight and frequent temperature changes can deteriorate oil and cause it to go rancid. Unfortunately, some of the most popular places to keep oil, such as windowsills and on the counter, are often the worst because the oil is subjected to too much sunlight and changes in temperature. Avoid keeping your oil in the places listed below, even if the oil can be kept at room temperature:

    Windowsills
    The back ledge of a stove
    In a cabinet above the stove
    Next to the stove or oven
    On the counter
    Next to the refrigerator (the external side of a fridge can get quite hot through a cupboard partition)
    Near cooking appliances such as kettles, waffle makers and toasters.
 

Following conditions are favourable for plant oil storage:
►low total impurities in the oil
►cool storage temperature
►avoiding temperature variations (and hence water-condensation)
►darkness (therefore metal tanks are better than plastic)
►for food oil production use a stainless steel container, with no cooper or steel materials, avoiding oxygen and water entry
►tanks should be easy to clean