On food and cooking the science and lore of the kitchen ( PDFDrive ) 1146

solid, or gel This behavior can be undesirable, for example when it causes some sauce to congeal on the plate But cooks also exploit it to make delightful jellies, a sort of solid sauce A gel forms when the gelatin concentration is sufficiently high, around 1% or more of the stock’s total weight At these concentrations, there are enough gelatin molecules in the stock that their long chains can overlap with each other to form a continuous network throughout the stock As the hot stock cools down to the melting temperature of gelatin, around 100ºF/40ºC, the extended gelatin chains begin to assume the coiled shape that they had in the original triple helix of the collagen fibers (p 597) And when coils on different molecules approach each other, they nest closely alongside each other and bond to form new double and triple helixes These reassembled collagen junctions give some rigidity to the network of gelatin molecules, and they and the water molecules they surround can no longer flow freely: so the liquid turns into a solid A 1% gelatin gel is fragile and quivery and breaks easily when handled; the more familiar and robust dessert jellies made with commercial gelatin are usually 3% gelatin or more The higher the proportion of gelatin, the more firm and rubbery the gel is Jellies are remarkable in two ways At their best they are translucent, glistening, beautiful on their own or as settings for the foods embedded in them And the temperature at which the gelatin junctions are shaken apart is right around body temperature: so gelatin gels melt effortlessly in the mouth to a fullbodied fluid They bathe the mouth in sauce No other thickener has this quality Protein-Thickened Sauces and Health Sauces thickened with proteins are very nutritious, and microbes can multiply rapidly in them They’re best held either ... commercial gelatin are usually 3% gelatin or more The higher the proportion of gelatin, the more firm and rubbery the gel is Jellies are remarkable in two ways At their best they are translucent, glistening, beautiful on their own or as settings for the. . .the water molecules they surround can no longer flow freely: so the liquid turns into a solid A 1% gelatin gel is fragile and quivery and breaks easily when handled; the more familiar and robust dessert jellies made with... beautiful on their own or as settings for the foods embedded in them And the temperature at which the gelatin junctions are shaken apart is right around body temperature: so gelatin gels melt effortlessly in the mouth to a fullbodied fluid