Analysis of discoloration of laver;
The possibility of dyeing laver itself is very small. The discoloration of laver after soaking in water may be caused by the overflow of phycoerythrin from laver. Because of the differences of varieties, processing methods, processing temperature and storage methods, this pigment will be dissolved in different situations, but it is harmless to human body. The amount of dissolved laver can not be used as a standard to identify the quality of laver. If the public finds that the pigment overflows particularly badly, it may be oxidized by moisture during storage.
Tips for identifying the authenticity of laver;
1, first of all, we can observe the color of laver. Porphyra contains phycoerythrin, so the color of laver we usually buy should be dark brown or purple brown, with natural luster.
2. In order to save costs, some "black-hearted" manufacturers will sell cheap seaweed or seaweed as laver. The second method is to soak a small piece of laver in water for a period of time. The color of the water soaked by real laver has basically not changed. If the color of water turns bright purple and even has the same color as ink, it must be false;
3. Another method is to take a small piece of laver and bake it with fire. After baking, the laver with good quality should be green, just like the color of seaweed. If it turns yellow after baking, it is inferior laver;
4. The last method is to distinguish by taste. Some fake lavers are actually made of plastic film. There is nothing wrong with the color of the soaked water, but it will not be chewed in your mouth, and it is still very elastic when you tear it with your hands.
Introduction:
Porphyra is the algae body of algae, which is purple, generally 12 to 30 cm high, and the longest cultured Porphyra haitanensis is more than 4 meters. Distributed in Liaoning Peninsula, Shandong Peninsula and the coastal areas of Zhejiang and Fujian. North Korea and Japan are also produced.
Porphyra is a kind of red algae, which grows on shallow sea rocks. It has three colors: bonus purple, green purple and black purple. After drying, it is purple, so it is named Porphyra because it can be used as food. It is the thallus of Porphyra yezoensis, a plant of the family Brassica.
Porphyra has been recorded in China since before the Han Dynasty. It has always been regarded as one of the precious seafood, which is extremely delicious and deeply loved by people. Although laver is produced in coastal areas, it can be stored and transported for a long distance after being dried, and people can buy it everywhere and at any time.
You can carefully distinguish gloss, thickness and so on when choosing. The quality is thin, the surface is smooth, shiny, clean and free of impurities, and the water content is below 9%.
nutritive value
1. Porphyra has high nutritional value and contains many essential nutrients for human body. Its protein content is 9 times higher than that of fresh mushrooms, and every100g of laver contains 26.2g of protein.
2. Vitamins A, B, B, C and trace elements such as iodine, calcium and iron are also rich.
3. Its fat content is 8 times higher than that of kelp, calcium is 2 times higher than that of dried Tricholoma, niacin is 1 times higher than that of auricularia auricula, and riboflavin is 10 times higher than that of Lentinus edodes.
4. Rich in nutrition and high in iodine content, it can be used to treat goiter caused by iodine deficiency. Porphyra has the function of softening and resolving hard mass, and is also useful for other stasis lumps.
5. It is rich in choline, calcium and iron, which can enhance memory, treat anemia of women and children, and promote the growth and health care of bones and teeth; Contains a certain amount of mannitol, which can be used as an auxiliary food to treat edema.
6. The polysaccharide contained in laver can obviously enhance cellular immunity and humoral immunity, promote lymphocyte transformation and improve the immunity of the body; It can significantly reduce the total content of cholesterol in serum;
7. The inhibitory rate of effective components of laver on Ehrlich cancer is 53.2%, which is helpful for the prevention and treatment of tumors such as brain tumor, breast cancer, thyroid cancer and malignant lymphoma.
Applicable people
It is suitable for everyone to eat.
1. It is especially suitable for patients with goiter, edema, chronic bronchitis, cough, gall, gonorrhea, beriberi, hypertension, early stage of lung disease, cardiovascular diseases, various lumps, lobular hyperplasia of breast and various tumors.
2. It is not advisable to eat more, and people with poor digestive function and vegetarian spleen deficiency eat less, which can cause diarrhea. Abdominal pain loose stool fasted. People with spleen and stomach deficiency and cold should not eat.
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