It is common for kelp to bubble after soaking, mainly because it belongs to algae food and contains a lot of polysaccharides.
All kelp sold in the market is cut. When soaking or steaming, the protein in the polysaccharide will dissolve into the water from the broken segment, and foam will be generated. Therefore, bubbling kelp can be safely eaten. When the kelp is washed, there will be fewer blisters.
Under normal circumstances, after the bought kelp is soaked, the protein in the polysaccharide will dissolve into the water from the broken section, resulting in foam. If you soak in hot water or stir it a little, more bubbles will be produced.
Extended data:
Kelp belongs to algae food and contains a lot of polysaccharide, which is a kind of dietary fiber. Kelp (fresh) is suitable for people: most people can eat it.
Suitable for iodine deficiency, goiter, hypertension, hyperlipidemia, coronary heart disease, diabetes, arteriosclerosis, osteoporosis, dystrophic anemia, and sparse hair;
Especially suitable for people with energy deficiency, iodine deficiency, qi and blood deficiency, ascites due to liver cirrhosis and neurasthenia;
People with spleen and stomach deficiency and cold should eat carefully, and those with hyperthyroidism and iodine excess should not eat;
Pregnant women and lactating women should not eat kelp excessively;
Used for cooling and relieving summer heat: kelp, wax gourd and mung bean are appropriate, and soup is made.
Kelp has a high iodine content and many other special nutritional and medicinal values. It also contains a variety of essential trace elements, such as calcium, phosphorus, carotene and vitamin b 1.
Suitable for people: the general population can eat it. It is especially suitable for iodine deficiency, goiter, hypertension, hyperlipidemia, coronary heart disease, diabetes, arteriosclerosis, osteoporosis, dystrophic anemia, hair thinning, ascites due to liver cirrhosis, neurasthenia, etc.
References:
Kelp (Plant) Baidu Encyclopedia