If you soak sea cucumber in tap water or water with insufficient purity, the skin will be melted. Different ways of soaking will cause loss of nutrients in dried sea cucumber. The loss rate of copper, iron, zinc, calcium, magnesium and phosphorus caused by normal temperature water rising is between 73.25%-73.81%, the loss rate of high temperature water rising is 92.17%-92.95%, the loss rate of normal temperature alkaline rising is 76.79% (except magnesium ions), and the loss rate of all other chemical elements is 93.38%-95.24%.

In addition, all the three ways of rising cause the loss of lysine, histidine and arginine in the dried sea cucumber, the loss rate of lysine was 61.63% in normal temperature hydrofluidization, 72.61% in high temperature hydrofluidization, 79.46% in normal temperature alkalinefluidization, the loss rate of histidine was 15.24%, 52.86%, 35.71%, and the loss rate of arginine was 26.11% in the following order, 54.68%, 70.14%.

Look at the color, black or not. A good sea cucumber should be gray-brown or black-brown, with a shiny surface and gray, white intestines. Inferior sea cucumbers laced with sugar are instead dark and dark in color, and the intestines will turn red or black.?

Look at the shape and pinch it. A good sea cucumber has a well-proportioned body, firm flesh, sharp and intact thorns, and is hard to the touch and does not bend easily. Sugar-laced sea cucumbers are the opposite; their bodies bend easily, but their spines are straight.

Baidu Encyclopedia - Sea Cucumber