![]() These residues are usually discarded directly into the environment causing contamination problems, despite these residues contain proteins and are rich in essential amino acids 4. However, its processing generates a large amount of waste, such as head, tail, scales, fins, swimming bladder, cartilage, guts, and skin 2, 3. The acoupa weakfish ( Cynoscion acoupa) is a widely commercialized fish in Brazil, being the fourth most caught species in the last 10 years 1. These results indicate that the processes studied can be used to produce gelatin with suitable technological and functional properties for several applications. The gelatins obtained had gel strength of 298.00 and 507.33 g and emulsion activity index of 82.46 and 62.77 m 2/g in the combined and convective methods, respectively, and protein content above 90%. Infrared radiation at 70 ☌ for 2.0 h and convective drying at 70 ☌ for 3.5 h were the best condition of the combined process. The desirability function results show the convection hot air as the most effective method when conducted at 59.14 ☌ for 12.35 h. The gelatin obtained from the optimized conditions were characterized based on their physical, chemical, technological, and functional properties. This study aims to optimize drying methods such as convection hot air alone and combined with infrared radiation to obtain gelatin from acoupa weakfish skin by using composite central rotational designs 2 2 and 2 3 and response surface methodology. Therefore, it is relevant to understand the influence of drying conditions on the final product. Different technologies have been studied for drying gelatin. It can satisfy consumers with specific socio-cultural and religious needs. ![]() ![]() Fish skin is a raw material used for gelatin production. ![]()
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