Fish skin is rich in protein and various trace elements, and its protein is mainly composed of macromolecular collagen and mucopolysaccharide, which is a good product for Ms. beauty beauty. Medical research has found that leucine, the white blood cell in "fish skin", has anti-cancer effect. Fish skin is rich in collagen. Every100g of dry shark skin contains 67. 1 g of protein and 0.5g of fat, and its protein is collagen.
It is good for beauty and calcium supplementation. An acid-soluble fish skin collagen is prepared by chopping fish skin, soaking in sodium chloride solution to remove impurities, and degreasing with ethanol and acetone. Then, the mixture of citric acid and acetic acid was soaked and extracted, and then the acid-soluble fish skin collagen solution was obtained by centrifugal separation, and then the acid-soluble fish skin collagen precipitate was obtained by NaCl solid salting out.
Finally, the acid-soluble fish skin collagen precipitate was dissolved in acetic acid solution, and then dialyzed in na 2 hpo 4(pH 8.6), or ultrafiltered by acetate hollow fiber membrane with molecular weight greater than 60,000, and the product was obtained by solid vacuum freeze-drying obtained by dialysis or ultrafiltration.
The product is white, tasteless and spongy after freeze-drying. The purity of collagen products is ≥97%. Collagen is rich in glycine, proline and hydroxyproline, and its hydrolysate also contains physiologically active peptides. The molecular weight of collagen exceeds 60,000.
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Nutrition of other parts of fish:
1, fish head.
Fish head contains a certain amount of EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), belonging to ω-3 polyunsaturated fatty acids, which is beneficial to the development of baby's nervous system and brain. Compared with fish, fish heads are more likely to be rich in harmful substances. In order to balance nutrition and safety, it is suggested to avoid eating some fish with high mercury content, such as tuna, swordfish and swordfish.
2, fisheye.
Fisheye has always been regarded as a good eyesight-improving product, which does contain omega-3 polyunsaturated fatty acids beneficial to retinal health, but the content is not outstanding, which can not achieve eyesight-improving effect. Fish eyes are completely edible, but don't expect them to improve your eyesight.
3. Fish gills.
Fish gill is an important respiratory organ of fish, which is rich in iron. This part is also very susceptible to pollution by harmful substances. If you want to eat, you should also avoid eating fish with high mercury content such as tuna and swordfish.
4. Fishbone.
Fish bones are rich in trace elements such as calcium, but if eaten directly, the amount that the human body can absorb and utilize is particularly small. If you want to get nutrition from fish bones, you can add vinegar to the soup and stew it for 2~4 hours.
5. Fish roe.
Fish roe contains quite a lot of lecithin, which is helpful to the development of nervous system. But lecithin is also a kind of fat, so it is easy to get fat if you eat too much. It is recommended that you control the amount when eating, so as not to increase the risk of obesity.
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