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Confectionery and Chocolate Engineering: Principles and Applications [Anglais] [Relié]

Ferenc Mohos

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Table des matières

Preface. Acknowledgements. Part I Theoretical introduction. Chapter 1 Principles of food engineering. 1.1 Introduction. 1.2 The Damköhler equations. 1.3 Investigation of the Damköhler equations by means of similarity theory. 1.4 Analogies. 1.5 Dimensional analysis. 1.6 The Buckingham Π theorem. Further reading. Chapter 2 Characterization of substances used in the confectionery industry. 2.1 Qualitative characterization of substances. 2.2 Quantitative characterization of confectionery products. 2.3 Preparation of recipes. Chapter 3 Engineering properties of foods. 3.1 Introduction. 3.2 Density. 3.3 Fundamental functions of thermodynamics. 3.4 Latent heat and heat of reaction. 3.5 Thermal conductivity. 3.6 Thermal diffusivity and Prandtl number. 3.7 Mass diffusivity and Schmidt number. 3.8 Dielectric properties. 3.9 Electrical conductivity. 3.10 Infrared absorption properties. 3.11 Physical characteristics of food powders. Chapter 4 The rheology of foods and sweets. 4.1 Rheology: its importance in the confectionery industry. 4.2 Stress and strain. 4.3 Solid behaviour. 4.4 Fluid behaviour. 4.5 Viscosity of solutions. 4.6 Viscosity of emulsions. 4.7 Viscosity of suspensions. 4.8 Rheological properties of gels. 4.9 Rheological properties of sweets. 4.10 Rheological properties of wheat fl our doughs. Chapter 5 Introduction to food colloids. 5.1 The colloidal state. 5.2 Formation of colloids. 5.3 Properties of macromolecular colloids. 5.4 Properties of colloids of association. 5.5 Properties of interfaces. 5.6 Electrical properties of interfaces. 5.7 Theory of colloidal stability: the DLVO theory. 5.8 Stability and changes of colloids and coarse dispersions. 5.9 Emulsion instability. 5.10 Phase inversion. 5.11 Foams. Part II Physical operations. Chapter 6 Comminution. 6.1 Changes during size reduction. 6.2 Rittinger′s ′surface′ theory. 6.3 Kick′s ′volume′ theory. 6.4 The third, or Bond, theory. 6.5 Energy requirement for comminution. 6.6 Particle size distribution of ground products. 6.7 Particle size distributions. 6.8 Kinetics of grinding. 6.9 Comminution by fi ve–roll refi ners. 6.10 Grinding by a melangeur. 6.11 Comminution by a stirred ball mill. Chapter 7 Mixing/kneading. 7.1 Technical solutions to the problem of mixing. 7.2 Power characteristics of a stirrer. 7.3 Mixing–time characteristics of a stirrer. 7.4 Representative shear rate and viscosity for mixing. 7.5 Calculation of the Reynolds number for mixing. 7.6 Mixing of powders. 7.7 Mixing of fl uids of high viscosity. 7.8 Effect of impeller speed on heat and mass transfer. 7.9 Mixing by blade mixers. 7.10 Mixing rolls. 7.11 Mixing of two liquids. Chapter 8 Solutions. 8.1 Preparation of aqueous solutions of carbohydrates. 8.2 Solubility of sucrose in water. 8.3 Aqueous solutions of sucrose and glucose syrup. 8.4 Aqueous sucrose solutions containing invert sugar. 8.5 Solubility of sucrose in the presence of starch syrup and invert sugar. 8.6 Rate of dissolution. Chapter 9 Evaporation. 9.1 Theoretical background – Raoult′s law. 9.2 Boiling point of sucrose/water solutions at atmospheric pressure. 9.3 Application of a modifi cation of Raoult’s law to calculate the boiling point of carbohydrate/water solutions at decreased pressure. 9.4 Vapour pressure formulae for carbohydrate/water solutions. 9.5 Practical tests for controlling the boiling points of sucrose solutions. 9.6 Modelling of an industrial cooking process for chewy candy. Chapter 10 Crystallization. 10.1 Introduction. 10.2 Crystallization from solution. 10.3 Crystallization from melts. 10.4 Crystal size distributions. 10.5 Batch crystallization. 10.6 Isothermal and non–isothermal recrystallization. 10.7 Methods for studying the supermolecular structure of fat melts. 10.8 Crystallization of glycerol esters: Polymorphism. 10.9 Crystallization of cocoa butter. 10.10 Crystallization of fat masses. 10.11 Crystallization of confectionery fats with a high trans–fat portion. 10.12 Modelling of chocolate cooling processes and tempering. Chapter 11 Gelling, emulsifying, stabilizing and foam formation. 11.1 Hydrocolloids used in confectionery. 11.2 Agar. 11.3 Alginates. 11.4 Carrageenans. 11.5 Furcellaran. 11.6 Gum arabic. 11.7 Gum tragacanth. 11.8 Guaran gum. 11.9 Locust bean gum. 11.10 Pectin. 11.11 Starch. 11.12 Xanthan gum. 11.13 Gelatin. 11.14 Egg proteins. 11.15 Foam formation. Chapter 12 Transport. 12.1 Types of transport. 12.2 Calculation of flow rate of non–Newtonian fluids. 12.3 Transporting dessert masses in long pipes. 12.4 Changes in pipe direction. 12.5 Laminar unsteady flow. 12.6 Transport of flour and sugar by air flow. Chapter 13 Pressing. 13.1 Applications of pressing in the confectionery industry. 13.2 Theory of pressing. 13.3 Cocoa liquor pressing. Chapter 14 Extrusion. 14.1 Flow through a converging die. 14.2 Feeders used for shaping confectionery pastes. 14.3 Extrusion cooking. 14.4 Roller extrusion. Chapter 15 Particle agglomeration: Instantization and tabletting. 15.1 Theoretical background. 15.2 Processes of agglomeration. 15.3 Granulation by fl uidization. 15.4 Tabletting. Part III Chemical and complex operations: Stability of sweets. Chapter 16 Chemical operations (inversion and caramelization), ripening and complex operations. 16.1 Inversion. 16.2 Caramelization. 16.3 Alkalization of cocoa material. 16.4 Ripening. 16.5 Complex operations. Chapter 17 Water activity, shelf life and storage. 17.1 Water activity. 17.2 Shelf life and storage. 17.3 Storage scheduling. Chapter 18 Stability of food systems. 18.1 Common use of the concept of food stability. 18.2 Stability theories: types of stability. 18.3 Shelf life as a case of marginal stability. 18.4 Stability matrix of a food system. Part IV Appendices. Appendix 1 Data on engineering properties of materials used and made by the confectionery industry. A1.1 Carbohydrates. A1.2 Oils and fats. A1.3 Raw materials, semi–fi nished products and fi nished products. Appendix 2 Solutions of sucrose, corn syrup and other monosaccharides and disaccharides. Appendix 3 Survey of fl uid models. A3.1 Decomposition method for calculation of fl ow rate of rheological models. A3.2 Calculation of the friction coeffi cient ξ of non–Newtonian fl uids in the laminar region. A3.3 Generalization of the Casson model. A3.4 Determination of the exponent n of the flow curve of a generalized Casson fluid. A3.5 Dependence of shear rate on the exponent n in the case of a generalized Casson fluid. A3.6 Calculation of the fl ow rate for a generalized Casson fluid. A3.7 Lemma on the exponent in the generalized Casson equation. Appendix 4 Fractals. A4.1 Irregular forms – fractal geometry. A4.2 Box–counting dimension. A4.3 Particle–counting method. A4.4 Fractal backbone dimension. Appendix 5 Introduction to structure theory. A5.1 General features of structure theory. A5.2 Attributes and structure: A qualitative description. A5.3 Hierarchical structures. A5.4 Structure of measures: A quantitative description. A5.5 Equations of conservation and balance. A5.6 Algebraic structure of chemical changes. A5.7 The technological triangle: External technological structure. A5.8 Conserved substantial fragments. Appendix 6 Technological lay–outs. Further reading. References. Index.

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