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Never soak wolfberry in a thermos cup
As the saying goes: "There are three treasures for middle-aged people, the wolfberry and jujube Thermos cup." After the beginning of winter, the temperature "drops off a cliff", and thethermos cup has become the standard for many middle-aged people.
But friends who like to drink like this should be careful, because if you are not careful, the thermos cup in your hand may turn into a "bomb"!
- In August 2020, a girl in Fuzhou, Fujian Province used a thermos cup to soak red dates but forgot to drink it. An "explosion" occurred when she unscrewed the thermos cup more than ten days later. The cup lid bounced up, causing the girl's right eyeball to rupture;
- In January 2021, Ms. Yang from Mianyang, Sichuan was preparing to eat when a thermos cup with wolfberry soaked in it suddenly exploded on the table, blowing a hole in the ceiling...
Why does a good thermos cup explode after soaking red dates and wolfberry? Which drinks are not suitable for putting in Thermos Cups? How should we choose a qualified and healthy thermos cup? Today, let’s talk to you about “insulated cups”.
01Why does soaking red dates and wolfberry in a thermos cup cause an explosion?
- The thermos cup explodes: mostly microorganisms are at work.
In fact, the explosion that occurred when red dates and wolfberries were soaked in a thermos cup was caused by excessive gas production by microbial fermentation.
There are many hygienic dead spots in our thermos cups, such as a large number of bacteria that may be hidden in the inner tank, gaps in the bottle cap, etc. Dried fruits such as red dates and wolfberries are rich in nutrients. After being soaked in water, the sugars and other components in them are dissolved, making it easier to used by microorganisms.
Therefore, in an environment with suitable temperature and sufficient nutrients, these microorganisms will ferment to produce a large amount of carbon dioxide and other gases, and the longer the time, the more gases are produced; the air pressure in the sealed thermos cup continues to increase, and once the cup lid is suddenly opened, This may cause hot water to gush out and cause an "explosion" to injure people.
- In addition to red dates and wolfberries, these foods also have the risk of explosion
From the above analysis, we can know that nutritious food suitable for microbial reproduction, placed in a thermos cup for a long time, is an important factor in causing explosions. Therefore, in addition to red dates and wolfberries, longan, white fungus, fruit juice, milk tea and other high-sugar and high-nutrition foods are best brewed and drunk immediately, and do not store them in a thermos cup for a long time.
In addition, effervescent tablets and other medicines will quickly release a large amount of carbon dioxide after contact with water, and carbonated drinks themselves contain a large amount of gas. This type of food will cause the air pressure in the cup to increase. If shaken, it is likely to cause the cup to explode, so it is best not to use a thermos cup for brewing or storage.
【Tips】
(1) When using a cup with good airtightness such as a thermos cup, it is best to preheat it with hot water and then pour it out before adding hot water to avoid excessive temperature difference, which may cause a sudden increase in air pressure and cause a "gushing" of hot water.
No matter what hot drinks are brewed in the thermos cup, they should not be left for a long time; it is best not to unscrew the cup lid all at once before drinking. You can release the gas by carefully opening and closing the cup lid repeatedly, and do not face the cup mouth when opening it. , to prevent injury.
02It’s best not to put these drinks in a thermos cup!
Since the thermos cup has outstanding heat preservation function and good sealing performance, many people not only use it to soak red dates and wolfberry, but also use it to make tea and hold milk and soy milk. Is this okay?
Experts say that using a thermos cup to hold these two types of drinks, although there is no hidden danger of explosion, may affect the nutrition and taste of the drink, and even shorten the service life of the thermos cup!
- Brewing tea in a thermos cup: loss of nutrients
Tea contains tea polyphenols, tea polysaccharides, caffeine and other nutrients, which have strong health care effects. When hot water is used to brew tea in a teapot or ordinary glass, the active substances and flavor substances in the tea leaves will quickly dissolve, making the tea fragrant and sweet.
However, if you use a thermos cup to make tea, it is equivalent to continuously boiling tea leaves with high-temperature water. The active substances and aromatic substances in the tea leaves will be destroyed due to excessive heat, resulting in nutrient loss, thick and dark tea color, and bitter taste.
- Milk and soy milk in thermos cups: prone to rancidity
High-protein drinks such as milk and soy milk are best stored in sterilized or low-temperature environments. If it is placed in a thermos cup for a long time after heating, the microorganisms in it will easily multiply, causing the milk and soy milk to go rancid, and even produce floc. After drinking, it will easily cause abdominal pain, diarrhea and other gastrointestinal discomfort symptoms.
In addition, milk contains acidic substances such as lactose, amino acids, and fatty acids. If stored in a thermos cup for a long time, it may chemically react with the inner wall of the thermos cup and cause some alloy elements to dissolve.
Suggestion: Try not to use thermos cups to hold hot milk, soy milk and other drinks, and do not leave them for too long. It is best to drink them within 3 hours.
03How to choose a qualified thermos cup?
From this point of view, although the thermos cup is powerful, it cannot hold everything, and it may cause hidden dangers if you are not careful! Of course, if you want to use a thermos cup safely, in addition to knowing who it is to be used for, you must also choose qualified and healthy products. So how do we choose? Here are 3 tips you can use:
- Look at the mark: identify the material of the liner
The inner tank material of the thermos cup is generally made of stainless steel. Now, there are three common stainless steel materials on the market, which can be identified by the marks on the bottle mouth or liner:
- 201 stainless steel: It is an industrial-grade stainless steel with poor corrosion resistance and cannot withstand acidic solutions. Rust spots will appear even in water, so it is not recommended to buy.
- 304 stainless steel: It is a recognized food-grade stainless steel with good processing performance and corrosion resistance. Generally, there will be SUS304, S304XX, 304, 18/8, 18-8 and other marks on the bottle mouth or inner tank.
- 316 stainless steel: It is medical grade stainless steel. It has better corrosion resistance than 304 stainless steel, but the price is a bit higher. Generally, there will be US316, S316XX and other marks on the bottle mouth or liner.
- Touch the bottom: check the thermal insulation performance
We can fill the thermos cup with boiling water and tighten the lid. After about 2 to 3 minutes, touch the surface of the cup body with your hand. If you find a warm feeling, it means that the thermos cup has lost its vacuum layer and the insulation effect of the inner tank is Not good.
- Pour it down: Check the tightness
We can fill the thermos cup with boiling water, tighten the lid, and then turn it upside down for five minutes. If the thermos cup leaks, it indicates that its sealing is not good.