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  • 1
    Keywords: Science (General). ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (666 pages)
    Edition: 1st ed.
    ISBN: 9781493925780
    Series Statement: Food Engineering Series
    DDC: 664/.028
    Language: English
    Note: Intro -- Preface -- Acknowledgements -- Contents -- Contributors -- The State ofWater andIts Impact onPharmaceutical Systems: Lipid-Based Drug Delivery Systems andAmorphous Solids -- 1 Introduction -- 2 Molecular Dynamics Simulations -- 3 Water Uptake, Distribution, andEffects onDrug Solubility inLipid Vehicles Composed ofTriglycerides andMonoglycerides -- 4 Water Uptake andIts Implications inanAmorphous Glass (PVP) -- 5 Water Distribution, Mobility, andEffects onTransbilayer Diffusion ofPermeants inLipid Bilayers -- 6 Conclusions -- References -- Food Preservation by Nanostructures-Water Interactions Control -- 1 Introduction -- 2 Parameters of Stability -- 2.1 Water Activity (aw) -- 2.2 Glass Transition Temperature (Tg) -- 3 Thermodynamic Parameters -- 4 Water Confined in Nanostructures -- 5 Minimum Entropy and Cooperatively Rearrangement Regions -- 6 Potential Application of Nanostructuration to Foods -- 7 Description of Food Morphology -- 8 Conclusions -- References -- Water and Food Appearance -- 1 Introduction -- 2 Potential Causes of Transparency/Opacity Changes -- 2.1 Dehydration or Rehydration -- 2.2 Appearance/Disappearance of Particles (Crystals/Bubbles Formation or Solids Dissolution) -- 3 Materials and Methodology for the Study of Appearance Properties -- 3.1 Materials -- 3.2 Chromatic Attributes -- 3.3 Opacity -- 3.4 Translucence -- 4 Translucence Changes -- 4.1 Fruit Products -- 4.2 Cereal Products -- 4.2.1 Transparentization by Refractive Index Matching -- 4.2.2 Correlation Between Reflectance and Chemical Markers of the Maillard Reaction -- 5 Conclusions -- 6 Future Work -- References -- Maillard Reaction inLimited Moisture andLow Water Activity Environment -- 1 Introduction -- 2 Materials andMethods -- 2.1 Preparation ofModel System -- 2.2 Color Parameters andAbsorbance Measurements -- 2.3 Kinetic Studies. , 2.4 Experimental Design andStatistical Analysis -- 3 Results andDiscussion -- 3.1 Preliminary Results -- 3.1.1 Color Development inControl -- 3.1.2 Determination ofSpectrumPeak -- 3.1.3 Effect ofMoisture Content intheColor Development -- 3.1.4 Color Parameters -- 3.1.5 Reaction Rate andKinetic Order -- 3.1.6 Reactivity ofReducing Sugars inMaillard Reaction -- 4 Conclusion andRecommendations forFuture Research -- References -- Carbohydrates andProteins asNonequilibrium Components of Biological Materials -- 1 Introduction -- 2 Dielectric andMechanical Relaxation Times -- 3 Fluidness Characteristics -- 4 Fluidness inFood Processing andStorage -- 4.1 Effects onMicrostructure -- 4.2 Stickiness andRelaxation Times -- 4.3 Component Crystallization -- 5 Conclusions -- References -- Low-Temperature Mobility of Water in Sugar Glasses: Insights from Thermally Stimulated Current Study -- 1 Introduction -- 2 Materials and Methods -- 2.1 Materials -- 2.2 Thermally Stimulated Current -- 2.3 Differential Scanning Calorimetry (DSC) -- 3 Results -- 4 Discussion -- 5 Conclusions -- References -- Functional Behavior ofDifferent Food Components asAffected by Water andPhysical State -- 1 Introduction -- 2 The Impact ofWater, Physical State, andMolecular Weight ontheDissolution ofCarbohydrates -- 3 The Impact ofWater andStructure onDissolution ofProteins -- 4 Conclusions -- References -- Effect ofDifferent Components ofEdible/Biodegradable Composite Films onWater Relationships inthePolymer Matrix -- 1 Introduction -- 2 Effect ofFilm Plasticizers onFilm Water Sorption Behavior -- 3 Effect ofLipids onWater Sorption Behavior ofHydrocolloid Films -- 4 Effect ofFilm Components onPhase Transitions -- 5 Final Remarks -- References -- Glass Transition Observed withCross-Linked Dextrans Containing aSmall Amount ofWater -- 1 Introduction -- 2 Materials andMethods -- 2.1 Materials. , 2.2 Sample Preparation -- 2.3 DSC Measurement -- 3 Results -- 4 Discussion -- 5 Conclusions -- References -- Sensorially and Instrumentally Detected Antiplastizicing Effect of Water in Cornflakes -- 1 Introduction -- 2 Materials and Methods -- 2.1 Samples -- 2.2 Glass Transition Measurement -- 2.3 Molecular Mobility -- 2.4 Mechanical Properties -- 2.5 Oral Texture Profile -- 3 Results and Discussion -- 3.1 Glass Transition and Molecular Mobility -- 3.2 Mechanical Properties -- 3.3 Oral Texture Measurements -- 3.4 Integrated Results -- 4 Conclusions -- References -- Characterization of a Hydrate-Dehydrate System with Critical Transitions in theTypical Range of Processing and Storage Conditions -- 1 Introduction -- 2 Materials andMethods -- 3 Results andDiscussion -- 4 Conclusions -- References -- Viscoelastic Sorption Behavior ofStarch andGluten -- 1 Introduction -- 2 Materials andExperimental Methods -- 3 Model -- 3.1 Viscoelastic Diffusion -- 3.2 Boundary Conditions andIsotherm -- 3.3 Rheological Model -- 4 Results andDiscussion -- 4.1 Isotherms -- 4.2 Dynamical Sorption -- 5 Conclusions -- References -- Molecular Weight Effects onEnthalpy Relaxation andFragility ofAmorphous Carbohydrates -- 1 Introduction -- 2 Materials andMethods -- 2.1 Differential Scanning Calorimetry (DSC) -- 3 Results andDiscussion -- 3.1 Glass Transition Temperature vs.Aging Conditions -- 3.2 Molecular Weight Dependence ofEnthalpy RelaxationTime -- 3.3 Fragility ofAmorphous Carbohydrates -- 4 Conclusions -- References -- Effect ofDehydration Conditions ontheBulk andSurface Properties oftheResulting Dehydrated Products -- 1 Introduction -- 2 Materials andMethods -- 2.1 Materials -- 2.2 Preparation oftheHydrate, Dehydrated, andAnhydrous Forms -- 2.3 Preparation ofAnhydrousForm -- 2.4 X-ray Powder Diffraction (XRPD) -- 2.5 Differential Scanning Calorimetry (DSC). , 2.6 Scanning Electronic Microscopy (SEM) -- 3 Results andDiscussion -- 4 Conclusions -- References -- Moisture Sorption Isotherms of Foods: Experimental Methodology, Mathematical Analysis, and Practical Applications -- 1 Introduction -- 2 Moisture Sorption Isotherms -- 2.1 Monolayer Moisture Content -- 2.2 Temperature and Composition Effects on Moisture Sorption Properties -- 2.2.1 Chemical Composition and Moisture Sorption Properties -- 2.2.2 Effect of Temperature on Sorption Isotherms -- 3 Experimental Methods for the Determination of Moisture Sorption Isotherms -- 3.1 Static Methods -- 3.2 Dynamic Methods -- 3.2.1 Dynamic Vapor Sorption Method (DVS) -- 3.2.2 Dynamic Dew Point Isotherm Method (DDI) -- 4 Modeling Sorption Isotherms -- 4.1 Brunauer-Emmett-Teller (BET) Equation (Brunauer et al. 1938) -- 4.2 Guggenheim, Anderson, and De Boer (GAB) Equation (van den Berg and Bruins 1981) -- 4.3 Halsey Equation (Halsey 1948) -- 4.4 Henderson Equation (Henderson 1952) -- 4.5 Kühn Equation (Kühn 1964) -- 4.6 Oswin Equation (Oswin 1946) -- 4.7 Lewicki Equation (Lewicki 1998, 2000) -- 4.8 Smith Equation (Smith 1947) -- 4.9 Peleg Equation (Peleg 1993) -- 5 Analysis of Applicability for Modeling of Food Sorption Isotherms -- 6 Models Used to Describe Food Moisture Sorption Isotherms -- 7 Thermodynamic Properties: Sorption Heat, Enthalpy (DeltaH), and Entropy (DeltaS) -- 8 Applications of Moisture Sorption Isotherms -- 9 Sorption Isotherms and Shelf Life Predictions Considering Parameter Variability -- 10 Final Remarks -- References -- Understanding Cryopreservation of Oyster Oocytes from a Physical Chemistry Perspective -- 1 Introduction -- 2 Effect of Rate of Cooling -- 2.1 Cryopreservation of Oyster Oocytes -- 2.1.1 Assessment of IIF by Cryomicroscopy -- 2.1.2 Assessment of IIF by Transmission Electron Microscopy (TEM). , 2.1.3 The Effect of Cooling Rates, Holding Times, and Plunging Temperatures on IIF and Post-Thaw Fertilization -- 2.2 Liposomes as a Membrane Model System for Freezing Studies -- 2.2.1 Effect of Freezing Temperatures and Cooling Rates on the Stability of EPC LUV -- 2.2.2 EPC at Various Holding Temperatures -- 2.2.3 Effect of Freezing Temperatures and Cooling Rates on the Stability of DPPC LUV -- 2.2.4 DPPC LUV at Various Holding Temperatures -- 3 Overall Summary -- References -- The Role ofWater intheCryopreservation ofSeeds -- 1 Introduction -- 2 Relationships Between Seed Structure andStorage Behavior -- 3 Mechanisms Implicated inDesiccation Tolerance ofSeeds -- 4 Subzero Storage Temperatures ofSeeds -- 5 Cryopreservation ofCitrus Seeds: A Case Study -- 6 Conclusions -- References -- Water Activity and Microorganism Control: Past and Future -- 1 Introduction -- 2 Microbial Growth and aw -- 3 Microbial Survival/Inactivation and Impact of aw -- 4 Mechanism of Action of Osmotic Stress -- 5 Water Activity Control: Future -- References -- On Modeling theEffect ofWater Activity onMicrobial Growth andMortality Kinetics -- 1 Introduction -- 2 Microbial Growth Curves -- 3 Chemical Changes andMicrobial Inactivation -- 4 Probabilistic Models -- 5 Concluding Remarks andFuture Challenges -- References -- Importance of Halophilic and Halotolerant Lactic Acid Bacteria in Cheeses -- 1 Introduction -- 1.1 Water Activity and Chemical Composition of Cheeses -- 1.2 Models Involving Salt Concentration in Cheeses -- 1.3 General Roles of Salt in Cheese -- 1.4 Halophilic and Halotolerant Microorganisms -- 1.5 Halophilic Lactic Acid Bacteria in Cheeses -- 2 Halotolerant Lactic Acid Bacteria in Mexican Cheeses -- 3 Modeling of Halotolerance -- 4 Conclusions -- References -- Influence of Water Activity and Molecular Mobility on Peroxidase Activity in Solution. , 1 Introduction.
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  • 2
    Online Resource
    Online Resource
    New York, NY :Springer,
    Keywords: Fruit-Processing. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (543 pages)
    Edition: 1st ed.
    ISBN: 9781493933112
    Series Statement: Food Engineering Series
    DDC: 664.8
    Language: English
    Note: Intro -- Preface -- Contents -- Contributors -- Chapter 1: Consumer Perception of Novel Technologies -- 1.1 Introduction -- 1.2 Consumer Attitudes Towards New Technologies -- 1.3 Factors That Influence Consumer Attitudes Towards New Technologies -- 1.4 Strategies for Changing Consumer Attitudes Towards New Technologies -- 1.5 Conclusions and Remaining Challenges -- References -- Chapter 2: Safety Issues on the Preservation of Fruits and Vegetables -- 2.1 State of the Art -- 2.2 Microbial Hazards -- References -- Chapter 3: Nutritional and Functional Attributes of Fruit Products -- 3.1 Introduction -- 3.2 Carotenoids -- 3.2.1 Effects of Thermal Processing -- 3.2.2 Effects of Minimal Processing -- 3.2.3 Effects of High Pressure Processing -- 3.2.4 Effects of High-Intensity Pulsed Electric Field Processing -- 3.3 Vitamin C -- 3.3.1 Effects of Thermal Processing -- 3.3.2 Effects of Minimal Processing -- 3.3.3 Effects of High Pressure Processing -- 3.3.4 Effects of High-Intensity Pulsed Electric Field Processing -- 3.4 Flavonoids -- 3.4.1 Effects of Thermal Processing -- 3.4.2 Effects of Minimal Processing -- 3.4.3 Effects of High Pressure Processing -- 3.5 Folates -- 3.5.1 Effects of Processing -- References -- Chapter 4: Minimal Processing of Fruits -- 4.1 Introduction -- 4.2 Physiological Aspects Affecting the Postharvest Life of Fruits -- 4.3 Minimal Processing Technologies Used in Fruit Preservation -- 4.3.1 Washing and Sanitizing of Fruits -- 4.3.1.1 Chlorine -- 4.3.1.2 Chlorine Dioxide -- 4.3.1.3 Acidified Sodium Chlorite -- 4.3.1.4 Hydrogen Peroxide -- 4.3.1.5 Peracetic Acid -- 4.3.1.6 Peroxyacetic Acid -- 4.3.1.7 Trisodium Phosphate -- 4.3.1.8 Electrolyzed Water -- 4.3.1.9 Ozone -- 4.3.2 Minimal Processing Methods to Extend Shelf-Life of Fresh-Fruits -- 4.3.2.1 Refrigeration -- 4.3.2.2 Natural Preservatives -- 4.3.2.2.1 Organic Acids. , 4.3.2.2.2 Essential Oils -- 4.3.2.3 Blanching -- 4.3.2.4 Ultraviolet Light -- 4.3.2.5 Irradiation -- 4.3.2.6 Pulsed Light -- 4.3.2.7 Ultrasound -- 4.3.2.8 High Hydrostatic Pressure -- 4.3.2.9 Food Packaging -- 4.3.2.9.1 Controlled Atmospheres -- 4.3.2.9.2 Modified Atmospheres -- 4.3.2.9.3 Edible Films and Coatings -- 4.4 Final Remarks -- References -- Chapter 5: The Hurdle Concept in Fruit Processing -- 5.1 Introduction -- 5.2 The Hurdle Concept -- 5.2.1 Basic Aspects -- 5.2.2 Most Commonly Used Hurdle Combinations -- 5.3 Research and Commercial Application: Examples of Combined Traditional and Novel Stressors -- 5.3.1 Cut and Whole Fruits -- 5.3.2 Juices -- 5.4 Recommendations -- 5.4.1 Microbial Behavior in Response to Stressors -- 5.4.2 Engineering Solutions -- 5.4.3 Support Studies for the Design of Preservation Techniques -- 5.5 Future Trends -- References -- Chapter 6: Cooling and Freezing of Fruits and Fruit Products -- 6.1 Cooling of Fruits -- 6.1.1 Introduction -- 6.1.2 Precooling Treatments and Refrigeration -- 6.1.2.1 Precooling -- 6.1.2.2 Refrigeration -- 6.1.3 Controlled and Modified Atmosphere -- 6.1.3.1 Carbon Dioxide and Oxygen -- 6.1.3.2 Other Atmospheres -- 6.1.3.2.1 Atmospheres with O2 at Super-Atmospheric Concentrations -- 6.1.3.2.2 Hypobaric Storage -- 6.1.3.2.3 Use of Other Gases -- 6.1.4 Novel Technologies: Thermal Treatments, UV-C Irradiation -- 6.1.4.1 Thermal Treatments (Heat Treatment, Heat Shock) -- 6.1.4.2 UV-C Irradiation -- 6.1.5 Minimally Processed Fruits -- 6.1.6 Edible Coatings -- 6.2 Freezing of Fruits -- 6.2.1 The Freezing Process: Ice Formation -- 6.2.2 Homogeneous and Heterogeneous Nucleation -- 6.2.3 Crystal Growth -- 6.2.4 Freezing Curves -- 6.2.5 Initial Freezing Point -- 6.2.6 State Diagram -- 6.2.7 Freezing Rate -- 6.2.8 Structure of Vegetable Tissue -- 6.2.9 Intracellular and Extracellular Ice Formation. , 6.2.10 Freezing Times -- 6.2.11 Freezing Equipment -- 6.2.12 Effect of Freezing and Frozen Storage on Quality Changes in Fruits -- 6.2.12.1 Physical Modifications -- 6.2.12.2 Chemical Modifications -- 6.2.13 Nutritional Quality of Frozen Fruits -- 6.2.14 Microbial Stability of Frozen Foods -- 6.2.15 Preparatory Operations for Freezing -- 6.2.16 Pre-freeze Treatments -- 6.2.16.1 Pretreatments of Fruits Using Sugar Syrups -- 6.2.16.2 Dehydrofreezing -- 6.2.17 Recommended Packaging and Industrial Freezing Methods for Fruits -- 6.2.18 Shelf-Life of Frozen Fruits -- 6.2.19 New Trends in Freezing Technology -- References -- Chapter 7: Thermal Drying of Foods -- 7.1 Introduction -- 7.2 Drying Mechanisms -- 7.3 Drying Equipment and Design -- 7.4 Drying Limitations of Conventional Dryers -- 7.5 Challenges in Drying R& -- D -- 7.6 R& -- D Opportunities in Drying -- 7.6.1 Development of Innovative Drying Technologies -- 7.6.2 Process Improvements of Existing Drying Technologies -- 7.6.2.1 Airflow -- 7.6.2.2 Temperature -- 7.6.2.3 Relative Humidity -- 7.6.2.4 Design and Operational Practices -- 7.7 Modelling and Optimisation -- 7.8 Future Directions -- References -- Chapter 8: Membrane Technologies for Fruit Juice Processing -- 8.1 Introduction -- 8.2 Membrane Processes -- 8.2.1 Pressure-Driven Membrane Processes -- 8.2.2 Electrical Membrane Processes -- 8.2.3 Concentration-Driven Membrane Processes -- 8.2.4 Interests and Limits -- 8.3 Applications of Membrane Processes to Fruit Juices -- 8.3.1 Potentialities of Membrane Processes Applied to Fruit Juices -- 8.3.2 Water Removal: Concentration -- 8.3.2.1 Concentration by Pressure-Driven Membrane Processes -- 8.3.2.2 Concentration Using Membrane Contactors -- 8.3.2.3 Concentration Using Direct Osmosis -- 8.3.3 Solid/Liquid Separation: Clarification and Microbial Stabilization -- 8.3.3.1 Impact on Quality. , 8.3.3.2 Engineering Aspects and Costs -- 8.3.3.3 Membrane Cleaning -- 8.3.4 Modification of Solutes Composition -- 8.3.4.1 Acidity Modulation -- 8.3.4.2 Phenolic Profile Modulation -- 8.3.5 Recovery of Functional Compounds from Juices or by-Products -- 8.3.5.1 Carotenoids -- 8.3.5.2 Phenolics -- 8.3.5.3 Aroma Compounds -- 8.3.6 Endogenous Enzyme Inhibition -- 8.4 Conclusion -- References -- Chapter 9: Decision Aid Tools for the Preservation of Fruits by Modified Atmosphere Packaging -- 9.1 Introduction -- 9.2 Constitution of Databases -- 9.2.1 Database on Fresh Fruits -- 9.2.1.1 Data on Optimal Storage Conditions -- 9.2.1.2 Data on Respiration -- 9.2.1.3 Data on Transpiration and Ethylene Production -- 9.2.2 Database on Packaging Materials -- 9.3 MAP Optimization Procedure -- 9.3.1 Mass Balance Model for Gas Exchanges -- 9.3.2 Mass Balance Model for Moisture Exchanges -- 9.3.3 Implementation of Temperature Variation -- 9.3.4 Implementation of Material Structures -- 9.4 Computing Advances to Develop Decision Aid Tool -- 9.5 Concluding Remarks -- References -- Chapter 10: Frying of Foods -- 10.1 Introduction -- 10.1.1 The Savory Snack Products Market and new Trends -- 10.1.2 Traditional Processing Technologies of Savory Snacks -- 10.1.3 Regular Fried Snacks -- 10.1.4 Novel Fried Snacks -- 10.2 Deep-Fat Frying of Food -- 10.2.1 History -- 10.2.2 The Frying Process -- 10.2.3 Frying Equipment -- 10.2.4 Oil Absorption Kinetics -- 10.2.5 Effect of Processing Conditions on Food and Oil Quality -- 10.2.5.1 Composite Structure Development -- 10.2.5.2 Beneficial Compounds Degradation and Development of Toxic Compounds -- 10.2.5.3 Color and Acrylamide Formation -- 10.2.5.4 Frying Oil Degradation -- 10.3 Vacuum Frying of Foods -- 10.3.1 History -- 10.3.2 Industrial Equipment -- 10.3.3 Vacuum and Atmospheric Frying Comparison. , 10.3.4 Oil Absorption During Vacuum Frying -- 10.3.5 Effect of Vacuum Frying Processing Conditions on the Quality of Food and Frying Oil -- 10.3.5.1 Composite Structure Development -- 10.3.5.2 Important Nutritional Compounds and Natural Color Preservation -- 10.3.5.3 Color and Acrylamide Formation -- 10.3.5.4 Sensory Properties of Vacuum-Fried Products -- 10.3.5.5 Frying Oil Degradation -- 10.3.6 New Trends -- References -- Chapter 11: Power Ultrasound Treatment of Fruits and Fruit Products -- 11.1 Introduction -- 11.2 Principles of Power Ultrasound Treatment -- 11.2.1 Ultrasound Generation -- 11.2.2 Ultrasound Treatment Apparatus -- 11.2.3 Mode of Action -- 11.3 Surface Decontamination -- 11.4 Postharvest Quality Enhancement -- 11.5 Ultrasound in Fruit Juice Processing -- 11.5.1 Microbial Inactivation -- 11.5.2 Enzyme Inactivation -- 11.5.3 Effects of Ultrasound Treatment on Juice Quality -- 11.6 Ultrasound-Assisted Drying of Fruits -- 11.7 Extraction of Value-Added Chemicals from Fruit and Fruit Products -- 11.8 Other Applications -- 11.8.1 Pest Control -- 11.8.2 Blanching -- 11.9 Conclusion -- References -- Chapter 12: Fruit Preservation and Design of Functional Fruit Products by Vacuum Impregnation -- 12.1 Introduction -- 12.2 Mass Transfer Mechanisms in Vacuum Impregnation Processes -- 12.3 Factors Affecting Impregnation Process Effectiveness -- 12.3.1 Effect of Pressure and Temperature on Vacuum Impregnation Effectiveness -- 12.4 Solution Composition and the Impregnation Process -- 12.4.1 Impregnation with Sugars and Salts -- 12.4.2 Impregnation with Minerals -- 12.4.3 Impregnation with Phenolic Compounds -- 12.4.4 Impregnation with Vitamins -- 12.4.5 Impregnation with Microorganisms -- 12.5 Final Remarks -- References -- Chapter 13: High Pressure Processing of Fruit Products -- 13.1 Introduction. , 13.2 Principles of High Pressure Processing (HPP).
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  • 3
    Keywords: Food science ; Agriculture ; Chemistry ; Trockenlebensmittel ; Pulver ; Lebensmitteltechnologie
    Type of Medium: Online Resource
    Pages: Online-Ressource (XVI, 372 p, digital)
    ISBN: 9780387276137
    Series Statement: Food Engineering Series
    RVK:
    Language: English
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  • 4
    Keywords: Food science ; Chemistry ; Lebensmittelverfahrenstechnik ; Lebensmitteltechnologie ; Biotechnologie
    Type of Medium: Online Resource
    Pages: Online-Ressource (digital)
    ISBN: 9780387754307
    Series Statement: Food Engineering series
    RVK:
    Language: English
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  • 5
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Heat, high hydrostatic pressure (HHP) and high pulsed electric field (PEF) inactivations of Zygosaccharomyces bailii ascospores and vegetative cells suspended in apple, orange, pineapple, cranberry and grape juices were investigated. The ascospores exhibited a heat resistance that was more than 5–8 times greater than the vegetative cells. After 5 min of pressurization at 300 MPa, the population of vegetative cells decreased almost 5 log cycles, while the population of ascospores decreased between 0.5-1 log cycles. In each fruit juice studied, two pulses of 32–36.5 kV/cm decreased the population of vegetative cells or ascospores 3.5 to 5 log cycles.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food processing and preservation 19 (1995), S. 0 
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pulsed electric fields of very high field strength and short duration are effective in the inactivation of E. coli. Nine log reduction in E. coli viability was achieved using a stepwise pulsed electric field treatment where E. coli suspensions were treated repeatedly in batches. It was demonstrated that high-strength pulsed electric field treatment is adequate for pasteurization of liquid foods.A 40,000 volt pulse generator was constructed to supply high voltage electric pulses to a treatment chamber with two parallel plate stainless steel electrodes where fluid food was contained. the gap between electrodes was 0.51 cm and the chamber volume was 14 ml. Pulse electric field strength ranged from 35 to 70 kV/cm. Pulse width was selected at 2 μs. Number of pulses per treatment varied from 1 to 80. E. coli were suspended in a simulated milk ultra-filtrate (SMUF) and treated with pulsed electric fields in a batch mode. the suspension fluid was maintained at constant temperatures of 7, 20, or 33C. Maximum temperature change occurring during each pulse was 0.3C measured by a fiber optics temperature probe. E. coli viability before and after treatment were assayed by counting colony forming units (cfu).
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  • 7
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of pulsed electric fields (PEF), conventional heating (H) at 60 or 65C for 21 s and PEF + heat (PEFH) treatments on the total growth of aerobic bacteria and the shelf life of skim milk was investigated. The PEF-processed skim milk was equivalent to conventionally heat-treated skim milk. After 14 days of storage, PEF-processed skim milk exhibited a total bacteria count of 5.4 log cfu/mL when treated at 28, 32 and 36 kV/cm for 84 μs, whereas heat-treated skim milk exhibited 5.9 and 5.3 log cfu/mL. PEFH treatment of skim milk produced a superior product in bacterial and shelf-life quality compared to either PEF or conventional heating alone and prolonged the shelf life of skim milk to 30 days when stored at 4C. Thus, the shelf life of skim milk stored at 4C was extended beyond 14 days.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food processing and preservation 28 (2004), S. 0 
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: High hydrostatic pressure (HHP) (103 to 517 MPa) was applied for selected times (5 to 25 min) on peach puree with and without the addition of antibrowning agents (1000 ppm ascorbic acid or 300 ppm cysteine). Polyphenoloxidase (PPO) activity was assessed before and after HHP processing. Peach purees were stored at 3C for 13 days and then at 22C for 15 additional days. A zp value of 224 MPa, in a range from 207 to 517 MPa of pressure, was obtained for peach puree without the addition of antibrowning agents. PPO activation at 103, 207 and 310 MPa or inhibition at 414 and 517 MPa was observed in peach purees containing added ascorbic acid. More than 50% inactivation of PPO was observed after adding cysteine to the peach puree and 99% inhibition was observed after 517 MPa of pressure at the experimental times. The higher the pressure treatment and the longer the treatment time for inactivating PPO, the less the discoloration of the peach puree with and without antibrowning agents during storage at low temperatures.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food processing and preservation 27 (2003), S. 0 
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The ability of methylcellulose and methylcellulose-stearic acid coatings to preserve the quality of Anjou pear wedges stored at 4C and 78% relative himidity over a period of 12 days was assessed. The effect of some additives (ascorbic acid, calcium chloride, and sorbic acid) alone or in combination with the edible coatings was also evaluated. The use of edible coatings and additives prolonged the shelf life of treated samples by retarding browning and enhancing texture when compared to control samples. Methylcellulose-stearic acid coatings played an important role in avoiding weight loss, while methylcellulose-only coatings showed poor water vapor barrier properties. Pear wedges coated with the methylcellulose-stearic acid formulation contained higher amounts of hexyl acetate throughout the storage period, probably due to synthesis by wounded tissue from the stearic acid contained in the coating. No effect from the applied treatments on the titratable acidity, soluble solids content, and microbial load of treated pear wedges was found.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food processing and preservation 17 (1993), S. 0 
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pulses of high voltage electric fields (PEF) are potentially a most important cold pasteurization/sterilization food preservation technique to replace or partially substitute for thermal processes. During the PEF process, lysis of micro-organisms is caused by irreversible structural changes in the membranes, leading to pore formation and destruction of the semipermeable barrier of the membrane. Theories explaining electroporation of the cell membrane and applications of the nonthermal PEF process are reviewed in this paper.
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