Emerging Dairy Processing Technologies: Opportunities for the Dairy Industry(IFST Advances in Food Science)

Fluid milk processing is energy intensive, with high financial and energy costs found all along the production line and supply chain. Worldwide, the dairy industry has set a goal of reducing GHG emissions and other environmental impacts associated with milk processing. Although the major GHG emissions associated with milk production occur on the farm, most energy usage associated with milk processing occurs at the milk processing plant and afterwards, during refrigerated storage (a key requirement for the transportation, retail and consumption of most milk products). Sustainable alternatives and designs for the dairy processing plants of the future are now being actively sought by the global dairy industry, as it seeks to improve efficiency, reduce costs, and comply with its corporate social responsibilities. Emerging Dairy Processing Technologies: Opportunities for the Dairy Industry presents the state of the art research and technologies that have been proposed as sustainable replacements for high temperature-short time (HTST) and ultra-high temperature (UHT) pasteurization, with potentially lower energy usage and greenhouse gas emissions. These technologies include pulsed electric fields, high hydrostatic pressure, high pressure homogenization, ohmic and microwave heating, microfiltration, pulsed light, UV light processing, and carbon dioxide processing. The use of bacteriocins, which have the potential to improve the efficiency of the processing technologies, is discussed, and information on organic and pasture milk, which consumers perceive as sustainable alternatives to conventional milk, is also provided. This book brings together all the available information on alternative milk processing techniques and their impact on the physical and functional properties of milk, written by researchers who have developed a body of work in each of the technologies. This book is aimed at dairy scientists and technologists who may be working in dairy companies or academia. It will also be highly relevant to food processing experts working with dairy ingredients, as well as university departments, research centres and graduate students.

Table of Contents:
About the IFST Advances in Food Science Book Series xi List of Contributors xiii Preface xv 1 Crossflow Microfiltration in the Dairy Industry 1 Peggy M. Tomasula and Laetitia M. Bonnaillie 1.1 Introduction 1 1.1.1 Membrane Types 1 1.1.2 MF Membranes 3 1.1.3 Pilot Plant Testing 6 1.2 MF Principles and Models 8 1.2.1 Gel Polarization Models 10 1.2.2 Osmotic Pressure Model 11 1.2.3 Resistance–in-Series Model 12 1.3 Applications of MF 13 1.3.1 Production of Concentrated Micellar Casein and Whey Proteins 13 1.3.2 Extended Shelf Life Milk 15 1.3.3 Cold Processing MF of Milk 20 1.3.4 Separation and Fractionation of Milk Fat from Whole Milk or Buttermilk 21 1.3.5 Separation of Milk Bioactive Compounds 22 1.3.6 Other Applications 23 1.4 Membrane Modifications to Increase Performance 23 1.5 Microsieves 23 1.6 Conclusions 24 Acknowledgements 25 Disclaimer 25 References 25 2 Novel Thermal Methods in Dairy Processing 33 Vijay K. Mishra and Lata Ramchandran 2.1 Introduction 33 2.2 Ohmic Heating 36 2.2.1 Principles 37 2.2.2 Factors Affecting OH 37 2.2.3 Applications and Influence of OH on Dairy Product Quality 40 2.3 Microwave Heating (MWH) and Radio Frequency Heating (RFH) 42 2.3.1 Principles 43 2.3.2 Factors Affecting MWH and RFH 44 2.3.3 Applications and Influence on Quality of Milk and Milk Products 48 2.4 Aspects of Microbiological Safety of Dairy Products 55 2.5 Conclusions 60 References 61 3 High-Pressure Processing of Milk and Dairy Products 71 Daniela D. Voigt, Alan L. Kelly, and Thom Huppertz 3.1 Introduction to High-Pressure Processing 71 3.2 Effects of High Pressure on Food Constituents: Basic Considerations 74 3.3 Effects of High Pressure on the Constituents of Milk 74 3.3.1 Milk Salts 74 3.3.2 Milk Fat and Milk Fat Globules 75 3.3.3 Whey Proteins 75 3.3.4 Casein Micelles 76 3.3.5 Milk Enzymes 77 3.3.6 Viscosity and Rheological Properties 78 3.4 Effects of High Pressure on Dairy Microbiology 78 3.5 HP Treatment and Cheese 79 3.6 High-Pressure Processing and Yoghurt 83 3.7 High-Pressure Processing and Functional Dairy Products 83 3.8 Ice Cream 84 3.9 Conclusions and Perspectives for the Dairy Industry 85 References 85 4 Applications of High-Pressure Homogenization and Microfluidization for Milk and Dairy Products 93 John Tobin, Sinead P. Heffernan, Daniel M. Mulvihill, Thom Huppertz, and Alan L. Kelly 4.1 Introduction 93 4.2 Emulsion Stability and Instability 94 4.2.1 Effects of Homogenization 94 4.2.2 Principles of High-Pressure Homogenization 96 4.2.3 Microfluidization 98 4.3 Effects of High-Pressure Homogenization and Microfluidization on Milk Constituents 99 4.3.1 Milk Fat Globules 99 4.3.2 Milk Proteins 101 4.3.3 Milk Enzymes 102 4.3.4 Microorganisms 103 4.4 Applications of HPH and Microfluidization in the Manufacture of Dairy Products 103 4.4.1 Milk 103 4.4.2 Yoghurt Manufacture 104 4.4.3 Cheese 105 4.4.4 Ice Cream 106 4.4.5 Cream Liqueurs 107 4.5 Conclusions and Future Perspectives 108 References 108 5 Pulsed Electric Fields (PEF) Processing of Milk and Dairy Products 115 Fernando Sampedro and Dolores Rodrigo 5.1 Introduction 115 5.1.1 Technology Principles 115 5.1.2 Processing Equipment 117 5.2 Application of PEF for Milk Pasteurization 118 5.2.1 Microbiological Aspects 118 5.2.2 Quality Aspects 125 5.2.3 Bioactive Compounds 128 5.2.4 Shelf Life Extension 128 5.3 Application of PEF to Dairy Products 130 5.3.1 Fruit Juice–Milk Beverages 130 5.3.2 Soya Milk and Fruit Juice–Soya Milk Beverages 137 5.3.3 Yogurt-Based Beverages 138 5.3.4 Infant Formula Milk Beverages 138 5.3.5 Other Milk-Based Beverages 139 5.4 Commercial Applications of PEF for Milk Pasteurization 140 5.5 Conclusions 141 References 141 6 High Power Ultrasound Processing in Milk and Dairy Products 149 Bogdan Zisu and Jayani Chandrapala 6.1 Introduction: Ultrasound in Dairy 149 6.2 Ultrasonic Equipment 151 6.3 Effects of Sonication on Milk Fat: Homogenization and Creaming 152 6.3.1 Homogenization 152 6.3.2 Creaming 155 6.4 Degassing and Foam Reduction 155 6.5 Thermosonication to Reduce Microbial Load 156 6.6 Ultrasound Assisted Filtration 157 6.7 Sonocrystallization of Lactose from Whey 159 6.8 Solubility of Rehydrated Powders 161 6.9 Effects of sonication on Milk and Casein Systems 163 6.9.1 Effects of Sonication on the Casein Micelle 163 6.9.2 Applied Ultrasound to Control the Viscosity of Milk Concentrates 164 6.10 Effects of Sonication on the Physical and Functional Properties of Whey Proteins 167 6.10.1 Gelation and Viscosity 167 6.10.2 Understanding Whey Protein Changes Induced by Ultrasound 169 6.10.3 Heat Stability of Whey Proteins 169 6.11 Sensory Characteristics of Sonicated Milk and Whey 172 6.12 Conclusions 173 References 173 7 Ultraviolet and Pulsed Light Technologies in Dairy Processing 181 Nivedita Datta, Poornimaa Harimurugan, and Enzo A. Palombo 7.1 Introduction 181 7.2 Basic Principles of UV Processing 183 7.2.1 The UV Process 183 7.3 Available UV Treatment Equipment and Their Operation 185 7.3.1 UV Dose Determination 187 7.3.2 UV Dose Measurement 188 7.4 Effects of UV Treatment on Microorganisms 188 7.4.1 Mechanisms of Action 188 7.4.2 Inactivation of Bacteria in Milk and Dairy Products 189 7.4.3 Packaging and Surface Disinfection 192 7.5 Commercial Developments 192 7.6 Other Light Processing Technique using UV light 194 7.7 Basic Principle of PL Technology 195 7.8 Effects of PL on Microorganisms 196 7.8.1 Mechanisms of Action 196 7.8.2 Inactivation of Bacteria in Liquid and Dairy Products 196 7.9 Commercial Developments 199 7.10 Conclusions 199 Acknowledgements 200 References 200 8 Carbon Dioxide: An Alternative Processing Method for Milk 205 Laetitia M. Bonnaillie and Peggy M. Tomasula 8.1 Introduction 205 8.2 Physicochemical Principles 206 8.2.1 Solubility of CO2 in Aqueous Solutions 207 8.2.2 Solubility of CO2 in Milk 208 8.3 Microbiological Action of High-Pressure and Supercritical CO2 209 8.3.1 Mechanism of Action of CO2 209 8.3.2 Influence of Processing Parameters: T, P, Agitation and Time 211 8.3.3 Inactivation of Different Microorganisms with CO2 211 8.3.4 Kinetics of Bacterial Inactivation with CO2 223 8.4 High-Pressure CO2 Treatment of Milk and Dairy Foods 223 8.4.1 Microbial Flora of Raw and Pasteurized Milk 223 8.4.2 Food Composition Affects the Bactericidal Action of CO2 225 8.4.3 Treatment of Milk with High-Pressure CO2 226 8.5 Low-Pressure CO2 Injection (Carbonation) to Extend the Shelf Life of Fluid Milk and Soft Dairy Products 228 8.5.1 Advantages of Carbonation 228 8.5.2 Does CO2 Treatment Affect the Quality and Functionality of Dairy Products? 229 8.5.3 Carbonated Raw Milk 230 8.5.4 Carbonated Pasteurized Milk 231 8.5.5 Cottage Cheese 232 8.5.6 Yogurt 233 8.5.7 Fermented and Flavoured Dairy Beverages 233 8.5.8 Butter, Sour Cream and Ice Cream 234 8.6 Other Dairy-Related Applications for CO2 234 8.6.1 Fractionation of Milk Lipids 234 8.6.2 Manufacture of Cheese from CO2-Treated Milk 236 8.6.3 Fractionation of Milk Proteins 237 8.7 Regulatory Status 239 Acknowledgements 240 References 240 9 Non-Thermal Pasteurization of Milk Using CHIEF Technology 251 Shaobo Deng, Paul Chen, Yun Li, Xiaochen Ma, Yanling Cheng, Xiangyang Lin, Lloyd Metzger, and Roger Ruan 9.1 Introduction 251 9.2 Principles 252 9.2.1 Biological Effects 252 9.2.2 Physical Principles 252 9.3 Equipment and Process Flow 255 9.4 Effects of the Process on Microorganisms and Quality 258 9.4.1 Microorganisms 258 9.4.2 Quality 259 9.5 Other Uses of CHIEF Technology 261 9.6 Future Development 261 9.6.1 Hardware Development 262 9.6.2 Evaluation of the Process 262 9.6.3 Hurdle Technology 262 Acknowledgements 263 References 263 10 Bacteriocins of Food Grade Lactic Acid Bacteria in Hurdle Technology for Milk and Dairy Products 267 John A. Renye, Jr and George A. Somkuti 10.1 Introduction 267 10.2 Bacteriocin Structure and Production 268 10.3 Application of Bacteriocins in Dairy Foods 273 10.3.1 Applications to Improve Food Safety 274 10.3.2 Sensory Effects of Bacteriocin Applications 275 10.3.3 Bacteriocin Resistance 276 10.4 Bacteriocins as Components of Hurdle Technology 277 10.4.1 Combined with Conventional Treatments 277 10.4.2 Combined with Emerging Technologies 280 10.5 Bacteriocins in Hurdle Technology for Dairy Food Safety 281 10.5.1 Bacteriocins Combined with Temperature Regulation 281 10.5.2 Bacteriocins Combined with Other Natural Preservatives 285 10.5.3 Bacteriocins and Pulsed Electric Fields 287 10.5.4 Bacteriocins and High-Pressure Processing 288 10.6 Conclusions 289 References 290 11 Leveraging the Beneficial Compounds of Organic and Pasture Milk 307 Michael H. Tunick, Diane L. Van Hekken, and Moushumi Paul 11.1 Introduction 307 11.2 Regulatory Status 307 11.2.1 Organic and Conventional Dairies 307 11.2.2 Nutritional claims 308 11.3 Bioactive Compounds in Milk 311 11.3.1 Peptides and Proteins 311 11.3.2 Fatty Acids 313 11.3.3 Vitamins and Minerals 314 11.4 Variations in Biologically Active Compounds 319 11.4.1 Pasture, Organic and Conventional Milk 319 11.4.2 Pasteurization and Homogenization 319 11.4.3 Feed Changes 320 11.5 The Future 321 11.5.1 Trends 321 11.5.2 Goals and Research Needs 322 Disclaimer 322 References 322 Index 333

About the Author :
Dr Nivedita Datta is a Lecturer in Food Science and Technology in the College of Health and Biomedicine at Victoria University, Melbourne, Australia. Dr Peggy M. Tomasula is Research Leader of the Dairy and Functional Foods Research Unit (DFFRU) at USDA/ARS/ERRC in Wyndmoor, Pennsylvania, USA.