Principles of Enzymology for the Food Sciences (Food Science by John R. Whitaker

By John R. Whitaker

This moment variation explains the basics of enzymology and describes the position of enzymes in nutrients, agricultural and health and wellbeing sciences. between different themes, it presents new equipment for protein choice and purification; examines the radical thought of hysteresis; and furnishes new info on proteases, oxidases, polyphenol oxidases, lipoxygenases and the enzymology of biotechnology.

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However, if the raw material is not fresh, already hydrolyzed fatty acids may form soaps in the aqueous phase. Several further approaches Lipids from land animals 37 using enzymes are described but are rarely applied commercially, mainly due to the high cost. When lard and edible tallow are produced, wet rendering methods are preferably applied, because the milder conditions yield fats which are light in colour, mild in flavour, and low in free fatty acids compared to dry rendered fats. Water is commonly added in the form of live steam to the cut or ground fatty tissue.

4 Characteristics of typical animal derived fats. Butter Lard Neat’s-foot oil Beef tallow Mutton tallow Iodine value Saponification number Melting point [°C] 25–42 53–77 69–76 40–48 35–46 210–233 190–202 190–199 190–199 192–197 28–35 33–46 –4 40–48 44–51 Source: Dugan (1987). desaturation of stearic to oleic acid, which tremendously increases firmness of the lard (see Chapter 13). The melting point, however, is not the temperature at which all solid turns to liquid. Even at temperatures fairly below the melting points, the fats contain some liquid phase.

The fatty tissues obtained in the course of ‘dressing’, the part of the slaughter process in which the animal is separated into carcass, offal, and byproducts, are mainly the internal fats from the abdominal cavity. These fats are called slaughter fats, killing-floor fats, or killing fats. Adipose tissue obtained later during the butchering process, when the chilled carcasses are divided into prime cuts and the meat is further being prepared for final consumption, is subcutaneous and intermuscular fat.

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