The present invention discloses a method for preparing
tuna skin gelatin, belonging to the technical field of
fish resources utilization. According to the invention,
skin tuna skin is subjected to pretreatment,
degreasing, acid and alkali treatment, and then is subjected to
gelatin extraction, and deodorization by filtering through
activated carbon, and
ion-exchange purification to remove heavy
metal ions, and then concentration under vacuum and spray-
drying to obtain finished products of
tuna skin
gelatin with quality meeting the edible gelatin standards specified in national standards. The tuna skin gelatin of the invention can be further processed for use and can be used in
medicine, food and cosmetic industries, achieving the purposes of turning waste into treasure, and comprehensively and efficiently developing high value-added tuna by-products. The method of the invention has advantages of: 1, a scientific and reasonable process is adopted, the temperature in the reaction process is low and easy to control, which saves energy and controls the molecular weight of the skin gelatin in a relatively
narrow range, and the quality of obtained gelatin is high; and 2,
activated carbon is used for filtering for deodorization, improving the taste of the product.