An integrated process for effective utilization of collagenous protein from raw hide trimmings: Valorization of tannery solid wastes

This study aimed to convert raw hide trimming waste into high-value collagenous products, thereby addressing solid waste problems and generating economic value. Processing parameters such as the effect of acid concentration on gelatin extraction and the effect of enzyme concentration/hydrolysis time on the extraction of collagen hydrolysate (CH) from raw trimming were optimized. These process parameters were then integrated to extract gelatin and CH sequentially from raw trimming wastes. The process produced ∼55% as gelatin with a gel strength of 230 ± 8 g and a molecular weight fraction ranged between 50 and 200 kDa. The remaining collagenous matrix (after gelatin extraction) was recovered as CH with a yield of 97% (based on available collagen) consisting of molecular weight fractions ranging from 598.31 to 6236.12 Da. The produced gelatin and CH met the requirements for high-value applications in the food, cosmetic, and pharmaceutical industries. The study demonstrates an efficient process for utilizing collagenous proteins from raw hide trimmings and valorizing tannery solid wastes. [Display omitted] •A novel process for valorizing tannery solid waste through recovering collagenous products from raw hide trimming waste.•Sequential extraction of gelatin and collagen hydrolysate from raw trimming waste with optimized processing parameters.•Produced gelatin matches commercial gelatin properties; collagen hydrolysate has high purity with poly-dispersed peptides.•The developed process provides high-value realization from tannery solid waste and offers a solution for its management.•Extracted collagenous products would suit the needs for high-value applications in the food, cosmetic, and pharma industries.