When you eat it, it is also eating you. Do you dare to eat it directly after watching it?

Experts in this article: Fu Shufang, Master of Food Science and Nutrition Engineering of China Agricultural University, technicians of key laboratory of national cardiovascular disease

This fruit of pineapple is really love and hate.

Love its sweetness and sweetness, hate it "difficult to lit".

There is a legend about it on the rivers and lakes -when you eat it, it is also eating you ...

Why is pineapple so tapped? Want to eat pineapple, is there any other good way to soak salt water? There are really.

Why is pineapple "tag"?

Pineapple "mouth" is mainly caused by pineapple protease and calcium oxalate needle crystal.

Pineapple protease

Pineapple protease is a variety of protease mixtures squeezed from pineapple. It has the function of decomposing protein. The main ingredient of tender meat powder we usually use is protease.

Pineapple proteases can break down the protein in the oral mucosa, which induce tingling sensation and even bleeding.

In addition, pineapple protease can cause allergies of some people. Protein enzymes increase the permeability of gastrointestinal mucosa, and the exotic protein of macromolecular internal molecules in the gastrointestinal infiltration of the blood, causing an allergic reaction in the body.

#If it causes allergic reactions, it is not just as simple as "tie", it will seriously cause paroxysmal strenuous abdominal colic, vomiting, diarrhea, itching of the skin, numbness of limbs and tongue Difficulty, shock and other reactions.

Calcium oxalate needle crystal

Calcium oxalate is a white crystalline powder, which is difficult to dissolve in water, and calcium oxalate needle crystals are a hydrophilic crystal form of calcium oxalate.

Calcium oxalic acid needle crystal is actually a weapon that is formed by plants in the process of evolution. Pineapple, kiwi, and spinach contain calcium oxalic acid needle crystals.

These small needle -shaped crystals can pierce the oral mucosa, so they have a mouthful of mouth. Experiments show that after adding calcium oxalate needle crystals to apple mud, apple puree will also be tangled.

Avoiding salt water from "tie mouth" is actually useless?

As we all know, soak it with salt water before eating pineapple, it seems that it is not so tapped. What is the scientific basis?

As mentioned earlier, the pineapple mouth is mainly due to calcium oxalate needle crystals and pineapple proteases. The solubility of calcium oxalate needle crystals in salt water will increase, so it can reduce the content of calcium oxalate chlorpyrilic in some pineapple.

The activity changes of pineapple protease are mainly affected by temperature, strong acid and strong alkali and heavy metals. Salt water does not make protease completely inactive and can partially suppress its activity.

A study published in "Food Technology" in July 2015 found that the activity of pineapple protease was effectively suppressed with 7%sodium chloride solution for 10 minutes.

To reach 7%concentration, if 1 liter of water is added to 70 grams of salt, it is actually a very large amount. Many people usually do not reach this concentration when pineapple is soaked.

However, after soaking in salt water, it can cover the sourness and bitterness of pineapple, and it tastes more sweet, so the taste will be better.

In order to make pineapple proteases the easiest way to lose work is actually high temperature, proteases above 60 ° C can be changed, so there is no feeling of tagging after making pineapple, pineapple rice, pineapple gurgle, pineapple fried shrimp, these dishes They are common pineapple dishes.

If you want to eat fresh pineapple, you can also try to soak in hot water above 60 ° C or heat up for a small meeting. You can achieve the effect of avoiding pineapple allergies.

Do you want to soak in pineapple, do you need pineapple?

There is also a saying about "pineapple to soak salt water, pineapple does not need to soak saline". What is the difference between pineapple and pineapple?

In fact, from the perspective of botany, pineapple and pineapple are the same plant, both of which are pineapple pineapples, and pineapple is the common name that gradually evolved later.

The merchants calculate pineapple and pineapple as two kinds of fruits. The leaves of pineapple are not jagged. There is no inner thorns after peeling. However, pineapple can only be regarded as a different variety of pineapple.

The protease content of pineapple will be lower, and the taste is sweeter, so it tastes less tapped, and it can be accepted by most people without salt water.

How to choose pineapple?

Having said so much about eating pineapple, let's take a look at some tips for choosing pineapple. You can observe from the following aspects:

See color: The mature pineapple is generally pale yellow or bright yellow. Such pineapple can be eaten immediately. The lower the color, the lower the maturity. If you want to eat it for a few days, you can choose the color of light yellow and green, about seven or eight cooked.

Look at the leaves: Fresh pineapple is generally sold with leaves. The leaf grows lushly that the pineapple grows in a good condition. Pineapple without leaves may not be naturally mature, and the taste may not be good. In addition, the varieties with long leaves are relatively sweet.

Touching softness: When buying pineapple, you can gently press the pineapple with your hands. If the hard and non -elastic ones are not mature, this pineapple taste is not good. If you press down with a slight softness and elasticity, this pineapple maturity is good. However, if the peeling is very soft, and even the juice is out, it may have been mature or broken.

Smell: You can also judge the maturity of pineapple by smelling the rich aroma of pineapple. Generally, the pineapple with good maturity can smell the obvious pineapple aroma, and the unfamiliar pineapple has no smell. However, if you smell the aroma too rich and even have alcoholic taste, it is already cooked and it is not recommended to buy it.

Seem

There is a certain scientific reason for pineapple for side dishes

Microwave heating pineapple

You can try

Source: Science Popularization China (Fu Shufang)

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