In the past two days, the hottest fruit is not a cherry, not a strawberry, but a sugar orange that looks ordinary and makes people's mouths stop.
# No bag of sugar oranges can stay overnight #, # Sugar oranges eat too much skin will really turn yellow # and other topics frequently rush to the hot search, why can we be conquered by this small fruit, in fact, there is a certain truth in this.
Human sweetness is genetically attached, which is difficult to change, and compared with other citrus, sugar oranges do taste sweeter. More importantly, it is a small head, easy to peel, and easy to eat one by one. So the question is, why are sugar oranges so sweet?
1
Why are sugar oranges so sweet?
1. High fructose and glucose content
The overall sugar content of sugar oranges is about 10-13%, and the sugar content of oranges is also 10-11%, so compared with other citrus fruits, the sugar content of sugar oranges is not very prominent.
However, the sweetness of the fruit is not only related to the sugar content, but also related to the type of sugar contained, of which the fructose is the sweetest, the glucose tastes good, and the sucrose accumulation fruit flavor is lighter, such as peach. Sugar oranges are precisely higher in fructose and glucose, so its overall taste is very good.
What is more frightening is that the sugar orange will be put for a long time, the sweeter it is, in the process of storage, glucose and fructose rise all the way, glucose can rise from 46.63mg/g just picked to 57.5mg/g, fructose can be from 42.47mg/g to 70.2mg/g.
2. Low content of citric acid
What affects the sweetness of the fruit is the sour-sweet ratio. Like hawthorn, who would have thought that its sugar content can reach about 22%, it is precisely because it contains a lot of organic acids, overshadowing the sweetness, so we mention hawthorn, the first reaction is sour rather than sweet.
In sugar oranges, there are also organic acids such as citric acid, but compared with other citrus counterparts, its organic acid content is relatively low, and in the storage process, the citric acid content in sugar oranges will be reduced all the way, from 6.9mg/g to 3.7mg/g.
The content of citric acid has nearly doubled, and the content of fructose has risen by more than half, and it is unreasonable that sugar oranges are not sweet.
3. Low temperatures will also make it sweeter
Fructose has two molecular configurations: α and β. α fructose is 3 times sweeter than β fructose, and when some β fructose is converted into α fructose at low temperatures, the sweetness will increase.
This leads to a property of fructose: the lower the temperature, the higher the sweetness, reaching up to 1.73 times that of sucrose.
And now it is a cold winter, the low temperature also gives sugar oranges a certain blessing, think about the iced watermelon, and the sugar orange in the ice and snow, is there a similarity.
2
Afraid of turning yellow? Afraid of fire, sugar oranges can not eat more!
Because the sugar oranges are so delicious, many people find themselves "yellow" after drying a box in one go.
This condition is actually "hypercaroteneemia". Sugar oranges are rich in carotene, and a sufficient amount of carotene is conducive to protecting our eyes, and can also synthesize a certain amount of vitamin A in our body.
However, if you consume too much carotene at a time, the body cannot be metabolized in time, and the content in the blood is too high, which may lead to yellowing of the skin, especially the palms and soles of the feet.
As long as we stop eating some orange fruits and vegetables such as oranges, mangoes, carrots, etc., after a week or two, the skin will return to natural.
At the same time, many netizens said that they ate too much sugar oranges, and there will be symptoms of "fire", which is actually brought about by fruit acid and sugar.
Excessive intake of fruit acid will cause irritation to our gums and oral mucosa, which may lead to problems such as redness and swelling of the gums and mouth ulcers. Excessive sugar intake will increase the cellular osmotic pressure, and the throat may be dry and astringent. If the mouth is not cleaned in time, it may also be used by bacteria, which can cause inflammation.
Studies have found that there are some special pro-inflammatory substances and sensitizing substances in citrus. Therefore, many infants and young children who eat complementary foods will have redness and swelling around their mouths after eating oranges.
So, sugar oranges are delicious, but you still have to control them. The "Dietary Guidelines for Chinese Residents" recommends that the daily intake of fruits in the general population should be controlled at 200-400g, and if converted into ordinary-sized sugar oranges, it is about 7-14.
If you really can't control it, it is recommended that you buy too many sugar oranges at a time, and try to diversify when buying fruits!
Resources:
WANG Lijuan. Study on quality changes during growth and development and storage period of Nanfeng mandarin orange[D].Huazhong Agricultural University,2011.
Yang Haijun. Characteristics of fructose syrup and its application in food industry[J].Cold drink and quick-frozen food industry,2002(02):39-41+44.
The picture originates from the Internet, invaded and deleted!