2. Flow chart presentation

The aim of industrial preparation is to break down insoluble collagen into soluble gelatin. To achieve this, two gelatin production routes are available, depending on the nature of the raw materials used: either pig skins (class A), or bovine bones and ossein (class B). The gelatin manufacturing process relies on progressive extractions based on a succession of operations designed to extract pure gelatin, freeing it from fat, proteins other than gelatin, and any minerals present. The pork gelatin chain, which accounts for the majority of the market, is presented here (figure 3 ).