Extraction of gelatin from aquatic processing waste with the approach of edible use

First the required amount (150 kg) of waste were collected from fish processing centers and transferred to the laboratory. In the next step, it is washed with tap water, soda solution in a ratio of 1 to 10 for 2 hours, then were removed the solution and prepared to be placed in acetic acid solution in a ratio of 1 to 10 for three hours. After washing, the residue were thoroughly washed with tap water, in a ratio of 1 to 10 combined with distilled water in a steel container and placed inside the oven at a temperature of 60 degrees celsius. After 8 hours, the container was removed and the residue separated from it using a filter and cotton. The gelatin solutions were reduced to half volume using heat and concentrated, then the concentrated solution was poured into steel trays and placed in a dryer at a temperature of 50 degrees celsius. At the end, the dried gelatin flakes were transferred to the mill and powdered. In the final stage, they were sent to the standard laboratory for analyses. The obtained results indicated that the gelatins of sturgeon skin, head of sturgeon, and head of gidder fish have a more suitable physico-chemical, sensory and standard quality than other wastes and have the ability to be produced on a larger scale.