But bromelain and some glycosides are really the culprit of "numbness" when eating pineapple, but soaking in salt water will not inactivate this enzyme and protect the mouth.
Because bromelain is very active, it can be kept active for a long time at room temperature, and the active temperature range can reach 40-60℃, so it can be kept during long-distance transportation until it reaches your mouth.
However, the common protein denaturing reagents do contain salts. But it is not salt (the main component of NaCl). As the main group metal, the sodium ion in salt and sodium chloride is quite stable, and almost no chemical changes occur, nor can it inhibit the activity of enzymes. What can directly denature protease is some transition metals on the periodic table of elements, such as Cu2+, Fe3+, Hg2+ and so on.
When the salt solution of these transition metals meets the enzyme, it will form coordination bonds with the enzyme. These new chemical bonds will strongly affect the structure and morphology of the enzyme, making it unable to combine with the target reactant, or deform normally, or even replace the original metal ions in the enzyme, which is manifested as "inactivation" of the enzyme on the macro level.
Therefore, if you want to eat pineapple without numbness, the best way is to heat it for a while at a temperature above 60, so that you can really eat it with peace of mind. Of course, since the PH activity range of the enzyme is 4.0-8.0, it is also possible to bubble with vinegar, provided that you can accept the smell? .
Extended data
Pineapple? Pineapple (scientific name: Ananascomosus (Linn.) Merr.) has a short stem. Leaves are numerous, arranged in rosettes, sword-shaped, tapering at the top, whole or with sharp teeth, green on the ventral surface, green on the back flour, with brownish red edges and tips. Leaves born at the top of inflorescence become smaller and often red.
Inflorescence is pulled out from the leaves, like a pine ball; Bracts are green at the base, reddish in the upper part and triangular-ovate; Sepals are broadly ovoid, fleshy and reddish at the top; Petals are oval, pointed, purplish red in the upper part and white in the lower part. Juhuaguo is fleshy. Flowering period is from summer to winter. ?
China, Fujian, Guangdong, Hainan, Guangxi and Yunnan are cultivated. Native to tropical America. Commonly known as pineapple, it is one of the famous tropical fruits.
reference data
Baidu Encyclopedia of Pineapple