Rice germ oil is still relatively unknown in this country. The sustainably produced oil can be used in a variety of ways in the kitchen and cosmetics.
How is rice germ oil obtained?
Rice germ oil is obtained from rice bran. Rice bran is the seed coat, embryo and pericarp of the rice grain. The rice bran is the part of the rice grain that is husked away in the production of white rice. By processing the rice bran into rice germ oil, the actual waste product can still be recycled.
Depending on the rice variety, rice bran contains between 16 and 32 percent oil, which can be either pressed or solvent extracted. It is important for the production of high-quality rice bran oil that the oil manufacturer processes the rice bran as quickly as possible after it has been husked.
Rice bran naturally contains fat-splitting enzymes, lipases. Lipases release individual fatty acids that give the oil a rancid taste. To prevent this, the rice bran is briefly heated to 130 degrees Celsius to deactivate the fat-splitting enzymes. Not only do enzymes decompose at this temperature, vitamins are also lost.
What are the ingredients of rice germ oil?
Native rice germ oil is rarely found commercially because it has a very distinctive smell. Refined rice germ oil, on the other hand, is almost odorless with a slightly yellowish hue. In the course of refining, the oil manufacturer removes the unwanted free fatty acids from the rice germ oil.
But ingredients that are said to have a positive health effect are also lost in the process. For example, refined rice germ oil has less than five percent of its original gamma-oryzanol content. As an antioxidant, gamma-oryzanol protects the body from free radicals and is used to improve blood lipid levels due to its cholesterol-lowering effect. The proportion of vitamin E also decreases in the course of oil refining.
The composition of rice germ oil is similar to that of argan oil. The dominant fatty acids are oleic acid, linoleic acid and palmitic acid. All of these fatty acids are saturated and monounsaturated fatty acids. Rice germ oil has only a small proportion of oxidation-prone polyunsaturated fatty acids, so it can be kept for up to twelve months.
Where is rice germ oil used?
The cosmetics industry often uses rice germ oil in sunscreens and skin protection creams. For this purpose, the refined rice germ oil is again enriched with the y-oryzanols lost during refining. These protect the skin from the sun by absorbing UVA and UVB rays. The likewise high proportion of phytosterols ensures that rice germ oil is also effective against skin irritation and itching. Rice germ oil can also be used to make soft soaps with a creamy foam.
You can also use rice germ oil in the kitchen as frying oil. Because it’s refined, it can be heated to high temperatures, so you can use it to sear and deep-fry food. Rice germ oil is relatively tasteless and is therefore particularly suitable for the production of mayonnaise.
From a sustainability point of view, rice germ oil is recommended because it is a recycled waste product. In order to avoid long transport routes, you should make sure that the rice used was grown in Europe and processed into oil there. Despite everything, domestic oils such as rapeseed oil remain better than rice germ oil.
