Sesame oil How is the "catalyst" of food safer?

Mixed vegetables and filling, sesame oil is a delicious "catalyst" that most families cannot do without; The stir-fry soup and a little sesame oil at the end are the finishing
touches.
In the dry and dry autumn season, the folk believe that eating sesame oil can also nourish the shade and dryness
.
How to buy, eat and store sesame oil, you can hear what the experts have to say
.

Shop Smell and read labels

Fragrant sesame oil is a unique traditional edible oil in China, with a rich flavor, the north of China often calls it sesame oil, and the south habits call it sesame oil
.

Wang Xingguo, executive vice president of the Oil and Fat Branch of the China Cereals and Oils Society and professor of the School of Food Science of Jiangnan University, said in an interview with the reporter of China Consumer News that the common sesame oil on the market at present has two kinds of small ground sesame sesame oil and sesame sesame oil, the difference is mainly related
to the production process.

Small ground sesame sesame oil, is the sesame seeds after roasting and stone grinding, and then using the water substitution method to produce the finished sesame oil
, the fragrance is very strong, generally used as cold seasoning oil.

The water substitution method has a history of more than 400 years in China, the sesame seeds are fried and ground into a sauce blank, and then a certain proportion of drinking water is poured into the sauce blank, using the characteristics of protein and cellulose in sesame seeds with different affinities for oil and water, and different specific gravity of oil and water, and naturally separates oil and water by stirring, precipitation, etc.
, which is a very wise traditional process
.

Sesame sesame oil, usually refers to the finished sesame oil prepared by pressing process after roasting sesame seeds, its aroma is slightly lighter than small ground sesame sesame oil, and the color is relatively light.

In addition to being used as cold seasoning oil, this sesame oil is also used in some places for stir-frying
.

How to choose good quality sesame oil, Wang Xingguo reminds consumers to pay attention to the following three points:

Read the label
carefully.
Pay attention to check the ingredient list, oil grade (according to the national standard, sesame oil has two grades, first and second grade), implementation standard, manufacturer, production license number, production date and shelf life and other identification information
.

It should be emphasized that the sesame oil ingredient list must only have sesame oil ingredients, or marked with sesame seeds as raw materials, and cannot contain other oils or other varieties of vegetable oil
.
Some edible oil products blended with sesame oil and other vegetable oils on the market can only be called edible plant blended oil, and its ingredient list can also have other vegetable oils in addition to sesame oil, and such products can not actually be counted as sesame oil
.

Observe the color
.
Small ground sesame sesame oil is pale red or orange-red; Sesame sesame oil is lighter in color than small ground sesame sesame oil, red with yellow; Edible vegetable blended oils containing sesame oil may be lighter in color
.

Smell the smell
.
Sesame oil has a pure, intense aroma, while edible plant blends containing sesame oil have a lighter flavor and other oily odors
.

Eat seasoning should avoid high temperature

"Vegetable oil should be strong, sesame oil should be fragrant, and cooking must be used at the same time
.
" This passage from the mid-Qing Dynasty cookbook "Tuning Ding Collection" is about the wonderful use
of sesame oil to add flavor and flavor to dishes.

Studies have shown that sesame oil not only tastes good, but also contains more nutrients that are beneficial to health
.
Such as linoleic acid, an essential fatty acid that is beneficial to heart and blood vessel health, and sesamol and sesamolin with
antioxidant effects.
At the same time, it is also rich in vitamin A, vitamin B and vitamin E
.
Traditional Chinese medicine believes that long-term consumption of sesame oil can not only "moisturize and replenish liquid", but also "eliminate the pleasantness, enhance appetite, refresh the mind and prevent aging"
.

However, such excellent sesame oil "acts" in the kitchen is very low-key, and "appearance" is often only a few drops and clicks
.
Can you "weigh on" sesame oil so that it can also be used for stir-frying like other edible vegetable oils?

Wang Xingguo said that compared with soybean oil, peanut oil and other vegetable oils, sesame oil is indeed a relatively special existence, and the reason why it is more suitable for seasoning rather than stir-frying is mainly due to the following two reasons:

The first is that sesame oil is rich in aroma, and when used for stir-frying, it will cover up the original taste of the dish, so that it "overwhelms the crowd"
.
At the same time, some sesame oil, especially small ground sesame oil, because the raw material itself is stir-fried at high temperature, there may be a faint paste when the stir-fry is heated, which affects the taste of the dish
.

Secondly, the high temperature during stir-frying will destroy the nutrients of sesame oil, and will also produce harmful oxidized fats and free radicals
.
In fact, the oil temperature is too high when stir-frying, which will not only lead to changes in the chemical structure of oil nutrients, affecting human digestion and absorption, but also destroy the fat-soluble vitamins A, D and E in the fat, resulting in a decrease
in nutritional value.

As for the online saying that drinking sesame oil directly before going to bed can moisturize the intestines and laxative, reduce inflammation and itching, beauty and even delay aging, Wang Xingguo believes that sesame oil does have a certain therapeutic health care effect, but it also varies from person to person
.

In addition, although sesame oil has the effect of lubricating the intestines, because of its large oil content, excessive intake may increase the burden on the gastrointestinal tract, especially in people with severe diarrhea
.
It is worth noting that people who are allergic to sesame seeds should avoid ingesting sesame oil, especially for infants and young children, so as not to induce allergic reactions
in the body.

Therefore, moderate consumption is the best choice
.

Storage preferably in glass packets

Compared with vegetable oil for stir-frying, sesame oil used for seasoning often takes longer after opening, and how to store it safely to prevent deterioration should be paid attention
to in daily life.

According to Wang Xingguo, the shelf life of sesame oil is generally 18 months, and it should not be stored at room temperature for more than 12 months
.
It should be noted that the quality reduction of sesame oil is a gradual process, most of the time, this gradual process can not be found simply by the nose and eyes, so it is recommended to buy small packages of sesame oil as much as possible and eat it
in a short time.
And if sesame oil has a smell such as hara, be sure not to eat
it again.

For the daily preservation of sesame oil, Wang Xingguo suggested that consumers pay special attention to the following points:

First of all, when storing sesame oil at room temperature, try to seal, low temperature, avoid light and dry, especially pay attention to stay away from higher temperature operating areas such as stovetops to avoid grease oxidation, resulting in quality reduction
.
Some people believe that sesame oil can be put in the refrigerator to prolong the shelf life, but doing so may cause the oil to crystallize, although it does not affect the consumption, the taste will deteriorate
.

Secondly, although sesame oil is placed in a compliant plastic bottle for a short time, there is no doubt about its safety, but from the actual use in daily life, it is recommended to give preference to glass bottles
for preserving sesame oil.
In addition, it is best not to use a rubber stopper for the bottle stopper of sesame oil, so as not to string flavors for a long time, if the bottle itself is a rubber stopper, you can use plastic wrap to make an isolation
.

Some netizens suggested that the shelf life can be extended by adding an appropriate amount of salt, that is, about 1 gram of refined salt per 500 grams of oil, and then the bottle mouth is plugged tightly, constantly shaken, and after it is fully dissolved, it is left in a cool place for two or three days to remove the precipitate, and then the clear sesame oil is poured into the
glass bottle.
It is said that doing so can effectively prevent the aroma of sesame oil from volatilizing or becoming odorless
.

Wang Xingguo believes that the principle of this method is to remove some substances in the oil that may produce taste through salting, but we must pay attention to the operation process and the hygiene of glassware to avoid grease being contaminated
.

(Reporter Li Jian)