Why do some fish glue shrink and some swell after stewing?

It has something to do with the variety of fish glue.

Some fish glue meat will keep its shape at the initial stage of stewing, and then it will gradually become smaller with stewing for a long time, because some of their nutrients and gums have entered the soup, and then the soup will become sticky, such as Xiaojinlong and eel glue, which will shrink after stewing;

Like red mouth, cod glue, etc. After the fish glue is stewed, the glue meat swells up and becomes different from the original appearance, and the soup is turbid.

In daily life, fish glue is the best choice for women to supplement collagen. Protein in human skin is 70% collagen, and the reticular structure supports the skin, making it look smooth, full, soft and elastic.

Extended data:

Types of fish glue:

1, gelatin

It is made of skin and scales left over from making fish fillets, and there is no viscera, blood, meat, etc. The raw materials are washed, soaked in lime water, acid leached to remove calcium phosphate from fish scales, rinsed, neutralized, gelled, filtered, frozen, sliced and dried. Gelatin has high purity, high transparency, high viscosity and strong freezing ability. Mainly used for making culture medium, offset printing plate, photographic film, etc. , can also be used in the food industry.

2. glue solution

Cleaning raw materials such as head, tail and bone mixed with blood, meat and viscera, heating with steam in a autoclave, filtering or high-speed centrifugal separation, removing impurities and fish oil, evaporating and concentrating to 50% concentration, and adding preservatives and spices. It does not freeze at room temperature and is convenient to use. It is an adhesive for wood, leather, etc. It is also a powder binder for making matches and grinding wheels.

3, swim bladder glue

1) After the swim bladder is washed with water to remove mucus and blood stains, the inner and outer membranes are peeled off, and the larger and thicker ones are dried separately to form flaky glue; Smaller and thinner pieces are stacked together, rolled into a circle or a belt, and after drying, they are called round glue or tape glue. Yellowish, translucent, tough and slightly fishy. It is used as a clarifier for beer and other drinks and a thickener for fruit juice jam.

2) In addition, high-quality large yellow croaker fillet glue, also called fish belly, is a traditional seafood. Yellow-lipped fish gum is a valuable tonic. As a clarifier of alcohol, fish glue has been used for a long time to clarify beer, improve the coolness, correspondingly improve the freezing stability, and play a certain role in shortening the after-ripening period.

Baidu encyclopedia-yujiao