“…Recently, natural (e.g., starch, cellulose, and gelatin) hydrogels have attracted much interest for alleviating environmental pollution [ 1 ]. Among them, gelatin derived from denatured collagen has been widely used in the food industry as an emulsifier, gelling and water retention agent, and in drug delivery because of its non-toxicity, storage stability, and cost-effectiveness [ 3 , 4 , 5 ].…”