Introduction to table salt
Table salt: one of the most commonly used seasonings in cooking, scientific name is sodium chloride (chemical formula NaCl), white crystal, strong hygroscopicity, should be stored and dried. Table salt is also an indispensable substance for normal physiological activities of the human body, 3 to 5 grams per person per day. Table salt is widely distributed in nature. Seawater is rich in table salt. Salt is also found in salt wells and salt mines in the lake. China has extremely rich salt resources.
In ancient times, there were many types of salt, and there were many colors: snow, peach blossom, blue, purple, white and so on. From the point of view: sea salt is made of sea brine, well salt is made of well brine, alkali salt is made by scraping and frying, pool salt is dried from pool brine, and cliff salt is born between earth cliffs. Sea salt, well salt, and alkali salt come from people, and pool salt and cliff salt come from heaven. The "History of Ming" records: "The salt feng shui of Xiezhou, the salt of Ningxia is scraped to the ground, the salt of Huai and Zhejiang is boiled, the salt of Sichuan and Yunnan is drawn from the well, the salt of Fujian and Guangdong is salt, the salt of Huainan is fried, the salt of Huaibei is dried, and the salt of Shandong is fried and sunburned. "The Southern Dynasty Tao Hongjing's "Famous Doctors' Catalogue" records: East Sea Salt, North Sea Salt, South Sea Salt, Hedong Salt Pond, Liang Yi Salt Well, Xiqiang Mountain Salt, Huzhong Tree Salt, different colors, hedong is the winner.
Nutritional value of table salt
The main component of table salt is the nature of sodium chloride sodium chloride: white crystal, easily soluble in water. Solubility does not vary much with temperature. Salty and edible (experiments have potassium iodate mixed in). The color reaction is yellow (the physical property of sodium ions). His aqueous solution can react with silver nitrate solution to form a white precipitate that is not allowed to dilute nitric acid, (the chemical properties of chloride ions) is mostly solid at room temperature, and the solubility in water is different.
The edible effect of table salt
1. Sterilization
Brine has sterilization, preservation and antiseptic effects. It can be used to clean up wounds to prevent infection, sprinkled on food can be kept fresh for a short time, and used to pickle food can also prevent deterioration.
2. Seasoning
Salt seasoning, can multi-form greasy freshness, remove the fishy smell, so that food to maintain the original taste of raw materials.
3. Promote the metabolism of the skin
The use of salt to remove the keratin and dirt on the surface of the skin, so that the skin presents a fresh, transparent and beautiful feeling can promote the metabolism of the whole body skin, prevent and treat some skin diseases, and play a better role in self-care.
Consumption of salt is contraindicated
1. Cough thirst quenching, edema patients should not eat.
2. Patients with hypertension, kidney disease, cardiovascular disease should limit their intake, it is best to replace salt with salt substitute (potassium chloride) or unsalted soy sauce to promote appetite.
3. Avoid putting iodized salt when making soup with stir-fry dishes. When stir-frying pan, iodized salt is added, the iodine consumption rate is only 10%, the intermediate iodized salt consumption rate is 60%; when the pot is put iodized salt is 90%; the consumption rate of iodized salt when cold mixed vegetables can reach 100%.
4. Iodine will be destroyed after binding with acidic substances. According to tests, if vinegar is added at the same time when stir-frying, the consumption rate of iodine will drop by 40% to 60%. In addition, when iodized salt meets sour vegetables (such as sauerkraut), the consumption rate will also decrease.
Purchase of table salt
High-quality table salt: the color is white; the crystals are neat and consistent, hard and smooth, transparent or translucent; no agglomeration, no anti-halogen moisture absorption phenomenon, no impurities; no odor, with a pure salty taste.
Storage of table salt
Table salt is corrosive and hygroscopic, and it is best to store it in a well-sealed crock pot. Try not to use metal utensils to hold, over time will corrode metal utensils, not good for the human body.
Source: Sichuan Salt Industry Corporation