Rapeseed oil is one of the most popular edible oils on the market, so if you want to open a rapeseed oil mill, you first need to have a certain understanding of rapeseed oil. Do you know how to choose rapeseed oil? Next, Benteng Machinery will introduce to you the process of pressing rapeseed oil, as well as its efficacy, advantages, preservation methods, etc.
Ⅰ. Oil extraction process of rapeseed oil
1. Extrusion process
The pressing process is the process we usually use to extract rapeseed oil. Can retain the original nutrients and natural flavor of rapeseed. Generally, using our 6YL-100 rapeseed oil press machine can effectively improve the oil yield of rapeseed and the quality of rapeseed oil.
2. Leach type process
Through high-temperature extraction and chemical treatment, you can get extracted rapeseed oil, but it is not as good as pressed rapeseed oil in terms of nutrition and taste. Therefore, it is generally not recommended to choose this method to extract rapeseed oil.
Rapeseed oil is golden in color, sweet, pungent and warm in nature. The human body has a high absorption rate of rapeseed oil, up to 99%, so the unsaturated fatty acids such as linoleic acid and vitamin E and other nutrients it contains can be well absorbed by the body. Rapeseed oil is suitable for most people, especially people with high cholesterol can also eat it with confidence, because rapeseed oil contains little or almost no cholesterol. Moreover, rapeseed oil has a high content of Omega 3, which is also of great benefit to the human body. But still pay attention to the applicable amount, which should not exceed 30 grams per day.
1. The linoleic acid contained in rapeseed oil has the effect of softening blood vessels and delaying aging.
2. Since rapeseed is the seed of a plant, rapeseed oil contains a certain amount of seed phospholipids, which are very important for the development of blood vessels, nerves, and brain.
3. Rapeseed oil is rich in vitamin E, and vitamin E can increase the influence of local retinal cells, increase the cell nutrition of the ocular surface mucosa, soften blood vessels and avoid clinical manifestations such as fundus hemorrhage and subconjunctival hemorrhage.
4. For people with poor liver and gallbladder, eating rapeseed oil can promote the liver to secrete bile, achieving the effect of clearing the liver and benefiting the gallbladder. In ancient times, people often used rapeseed oil externally to treat some diseases, such as rheumatism and eczema. Chinese medicine believes that rapeseed oil can play a role in dispersing fire and reducing swelling
Ⅳ. How to choose rapeseed oil?
Choose rapeseed oil from the following four aspects：
Pure rapeseed oil is dark yellow or brown, while inferior rapeseed oil is brownish red, tan or brown.
Good-quality rapeseed oil has the aroma of rapeseed, but poor-quality oil has a very light taste, and may even smell musty, burnt, and licorice.
High-quality rapeseed oil is clear and transparent, while low-quality rapeseed oil will have suspended solids or even turbid liquid.
Put a little rapeseed oil on the tip of your tongue, and there is no peculiar smell except the spicy taste, which means it is pure rapeseed oil. If the taste is flat, or even sour, burnt, or bitter, the quality of such rapeseed oil is not good.
5. Frozen Identification
Put a little rapeseed oil in the freezer of the refrigerator and take it out after 6 hours. If it is still in a liquid state, it means that it is pure rapeseed oil. If it is frozen into ice, it means that add palm oil or other ingredients to the rapeseed oil.
Ⅴ. Preservation method of rapeseed oil
The shelf life of rapeseed oil can reach 18 months under the condition of below 25 ℃, dry, cool and dark. However, some components in rapeseed oil will react after contact with microorganisms in the air, so eat it as soon as possible after opening.
1. Away from the stove
Many people are used to keeping canola oil next to the stove for easy cooking. Generally speaking, for every 10 degrees increase in temperature, the oxidation reaction rate of rapeseed oil will double, so keep it away from the stove.
2 Avoid Metal Containers
Many households like to put large barrels of oil into metal cans, but metal ions will promote the decomposition of hydroperoxides and accelerate the activation of oxygen into singlet oxygen and free radicals. Therefore, it is recommended to choose brown glass bottles, which are easier to store in shade.
The larger the contact surface with the air and the longer the contact time, the more the rapeseed oil will accelerate oxidation and cause rancidity. Therefore, the oil drum cover should be closed in time after each oil use.
In the light, rapeseed oil will accelerate oxidative rancidity. Under the action of ultraviolet rays, ozone compounds will also be formed, producing unpleasant smells, so plastic oil drums should also be stored away from light. In addition, the mixing of water will also accelerate the hydrolysis and oxidative rancidity of rapeseed oil, and the cleaned oil storage container should be dried before use.
The above are some knowledge points about rapeseed oil. If you want to build a rapeseed oil mill, please contact me. I will offer you suitable machine and the best price.