current and future processing of whey...
TRANSCRIPT
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CDRUW
Current and Future Processing of Whey Ingredients
Karen Smith, Ph.D.Wisconsin Center for Dairy Research
Center for Dairy Research “Solution Based Research Backed by Experience, Passion and Tradition”
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Why Process the Whey?Distribution of Milk Components Between Cheese and Whey
50% of the solids are in the whey
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Options for the Use of Whey
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How is Whey Used?
Amount of whey that is not used for either feed or food is not well documented.
17%
*ADPI 2012 Dairy Ingredient Utilization
Self Reported Values for Whey Use in 2012*
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Distribution of Whey Products Used for Human Food in 2012
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WHEY COMPONENTS
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CDRUW Components of Whey
ProteinsWhey proteins
α-lactalbuminβ-lactoglobulin
“Minor proteins”lactoferrinlactoperoxidase
Lactose
FatPhospholipids
Minerals (ash)Calcium phosphate
Lactic acid
Non protein nitrogen
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Concentration of Whey
Components
Component Concentration (%)Water 93.5Fat 0.3
Phospholipid 0.12Whey protein 0.8
β-Lactoglobulin 0.32α-Lactalbumin 0.12Immunoglobulins 0.06Bovine serum albumin 0.04Proteose-peptone 0.07Lactoferrin 0.003Lactoperoxidase 0.002Glycomacropeptide 0.13
Lactose 4.9Minerals 0.5
Calcium 0.05Phosphorous 0.04Potassium 0.15
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Types of Whey and Handling Considerations
SweetEasiest whey to handle
AcidCalcium and lactic acid are a problemCan be made into WPCs but requires more effort
FermentedLactic acid issuesAccelerated Maillard browning potentialWPC and/or permeate drying issues
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Types of Whey and Handling Considerations (continued)
OrganicDepends on compositionPotentially higher value productMust be segregated/handled separately
Sheep, goat, mixed milksPotentially higher valueSmaller amounts increase processing costs
KosherMajority of whey processing plants are kosherNon kosher whey not accepted at kosher plants
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Acid and Greek Yogurt Whey
Component Sweet Acid GreekTotal solids (%) 6.3 6.4 5.7Protein (%) 0.8 0.5 0.3Lactose (%) 4.9 4.4 4.2Minerals (%) 0.5 0.6 0.7Calcium (mg/100g) 45 103 123pH ~ 6.0 < 5.5 4.2
The problem: Acid whey is tough to process because of the mineral and acid content but has protein for value. Greek yogurt whey has even more acid and minerals and virtually no protein.
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THE STARTING POINT
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Basics of Whey Processing
Fines removalWhey cream removalPasteurizationBleaching (optional)Storage
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Fines Removal
Undesired in wheyFines are insolubleFlavor issues
Presence adversely affects whey cream removal
Remove before whey creamRipped bags and undersized equipment are sources of fines in wheyLimit – less than 100 ppm
Fines
Whey
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Whey Cream Removal
Undesired flavor and functionality in whey productsNeed whey with:
Less than 0.08% fat to make WPC34Less than 0.04% fat to make WPC80
Typical targetApproximately 0.06% fat
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Pasteurization
Eliminate pathogensReduce activity of starter cultureInactivate rennetTime/temperature
<16.5% total solids – regular pasteurization times/temperatures>16.5% total solids – modified time/temp
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Bleaching
Most customers want white wheyBleaching to remove color
Hydrogen peroxideBenzoyl peroxide
IssuesIncomplete color removalPossible off flavor developmentPresence of benzoic acid and foreign markets
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Storage of Whey
Regulations dictate time/tempFood safety issue
Growth of pathogensProduction of heat stable toxin by Staph
Product quality issueAcid production and sticky whey
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Cheese Culture Growth in Whey
No growth in raw or pasteurized whey at 37 or 60 F
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Cheese Culture Growth in Whey (continued)
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End Results of Drying Problem Whey
Material sticking to dryer walls
Increased rate of Maillard browning
Scorch
Clumping
Blocked valve
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CATEGORIES OF WHEY PRODUCTS
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Whey
Single cell protein
Organic matter
Fermentation Chemicalconversion/
Fermentation
EthanolMethanolLactitol
Chemicals
ConvertConcentrate Fractionate
Chemicalconversion/
Fermentation
MethaneEthanol
Fuels
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Converting Example
Galacto-oliosaccharidesOliosaccharide – carbohydrate composed of 2 to 10 monomer sugar units linked togetherProduced from lactose
• Japan (mid 1980’s) and Europe (1995)
Functional food• Prebiotic• Added to infant formula• Many health claims made but lack well-conducted clinical
trials
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An Example of a Galacto-oliosaccharide
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What are the Issues with Conversions?
Fermentations are never easyLow rates of conversionTypically must still purify What is the end product? Who is it for? What is the market for the ingredient?Alcohol is main conversion but hard to compete against corn
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Concentrating
No additional value to componentsCost savings for shipping through water removalExamples
Whole whey powderRO/Evaporated whey
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CDRUW Whole Whey Powder
• All components of whey except water
• Equipment required– Evaporator– Crystallizer/cooling– Spray dryer– Packaging equipment
• Byproducts– COW water
Fluid Whey
Clarificationand Separation
Clarified Whey
Pasteurization
Evaporation/Reverse Osmosis
Spray Dry
Whey Powder
CheeseFines
WheyCream
Crystallization
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Fractionating
Value added products produced by fractionatingMethod used to fractionate helps determine purity and cost of ingredient
Membranes versus chromatographyWPC versus purified lactoferrin
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FRACTIONATED WHEY
INGREDIENTS
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Whey Products
• Condensed/dried whey– sweet, acid
• Demineralized whey– 25, 50 and 90%
• Reduced lactose whey (mineral-concentrated)
• Whey protein concentrate– 34, 50, 60, 75 and 80%
• Whey protein isolate• Lactose hydrolyze whey• Protein hydrolyzed whey
• Lactose– industrial, food and
pharmaceutical• Lactose derivatives
– lactitol, lactulose and galacto- oligosaccharides
• Individual proteins– lactoferrin, lactoperoxidase
and glycomacropeptide• Dairy minerals• Permeate
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Dairy Ingredients Made From Whey
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Basic Assumptions
Assumptions for all whey for further processing:Cheese fines removedWhey cream removedWhey has been pasteurizedFinal product is to be dried
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Membrane Fractionation for WPCs
Tubular
Hollow fiber
Ceramic
Plate and frame
Spiral-wound
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PasteurizedFluid Whey
Concentration/Spray Drying
Ultrafiltration
PermeateWhey ProteinConcentrate
50 to 80WPC
Diafiltration
Whey Protein Concentrates and Permeate
PasteurizedFluid Whey
Concentration/Spray Drying
Ultrafiltration
PermeateWhey ProteinConcentrate
34 to 50WPC
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The Problem with Permeate (continued)
Courtesy of Todd Hutson, Filtration Engineering Co, Inc
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The Problem with Permeate (continued)
By product of WPC productionContains minerals and lactoseLarge volume
Original whey minus WPC volume (if no DF used)Low total solids (<5%)Costly to convert to dry productExpensive to ship if not concentratedHigh BOD if goes to sewerLimited ability to land apply
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Composition of Milk, Whey and Permeate
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Permeate Options
DryLactose (~60% yield) with DLP byproduct
DLP generally land applied, animal feedFuelFeedDigesterConversion
Oligosaccharides, hydrolysis
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Permeate (continued)
Equipment required to process permeate
EvaporatorCrystallizer
Expensive to process given value of final product
Evaporation/Reverse Osmosis
Crystallization
Permeate
Spray Drying
Permeate
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Yield for Products from Milk
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Additional Whey Ingredient Possibilities
Either not for beginners or small market products or both
Reduced lactose wheyLactose hydrolyzed wheyProtein hydrolyzed wheyDemineralized wheyIndividual proteinsDairy mineralsLactose
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HIGH PURITY PROTEINS
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CDRUWIndividual Whey
Proteins• Lactoferrin
– >90% purity• Lactoperoxidase
– 92% protein• Glycomacropeptide
– >90% purity• Lysozyme
– Isolated with lactoferrin and lactoperoxidase
Concentration/Spray Drying
DesorbedProteins
IonExchange
PasteurizedFluid Whey
Whey withselectedproteinsremoved
Selectedproteins
Spentcaustic/acidsolutions
Selectedproteins
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Chromatography Basics
ResinsBeads or granules of organic or sometimes inorganic materials which have the ability to absorb molecules under certain conditions
Column containing separating resin beadsAdd liquid containing two or more compounds to be separatedOne compound is attracted and flows slower than other compound thereby causing gradual separation
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Basic Steps in Ion Exchange Chromatography
Whey
Loading Rinse
- -
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-- -- -
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++
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--
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Rinsesolution
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---
Resin
Elutingsolution
- -
--
-- -- -
--
-+
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++
+
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Elution
-+ -+
-+
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-+-+
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Regeneration
Regenerationsolution
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Thoughts on Future for High Purity Proteins
Chromatography only large scale method for isolating individual proteins at this timeAside from one company, no one is rushing to adopt this process for feed streams of >1 million pounds per day
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Thoughts on Future for High Purity Proteins (continued)
Use of membranes in this area would require development of membranes with specific charges (similar to charged resin)Probably would need some adjustment to processing stream (pH, ionic strength, etc.) in conjunction with special membranesExtremely difficult to achieve this goal
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Range of Membrane Separations in the Dairy
Industry
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Enriched Protein Fractions
Specific proteins or groups of proteins in higher concentrations than typically present
Not 100% pureMembrane technology used
Polymeric MF membranesHot or coldRaw, pasteurized, whole, skim, whey, etc.
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Possibilities - General
Concentrates with different levels of protein, fat, lactose and minerals and depleted or enriched in certain protein fractionsSeparation of the milk ahead of cheese manufacture to produce native whey protein concentrates/isolates, reduced β-casein in milk/β-casein enriched whey fractionWPC80 with clarity and functionality of WPIControl of Maillard browning during storage
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An Example: Beta-Casein
Most surface active of all the milk proteinsSuperior foaming/emulsification
Possible replacement or substitute for imported sodium caseinate
β-casein is the key ingredient in sodium caseinateSource of numerous bioactive peptidesFortification of infant formula
Closer to human milk ratios of caseins
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MF for β-casein Reduction in Cheesemilk
Implicated in melt properties and delayed flavor development in cheeseGoal:
Retentate is partially depleted of β–caseinβ-casein with whey proteins in permeate fraction
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58
Beta-Casein Purification Process: Maintains beta-casein with high solubility
and functionality
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Comparison of Foaming Performance
Sample Overrun(%)
Stability(minutes)
5% WPC <800 < 8
1% Beta-casein 1380 32
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Options for Whey Proteins and β-casein
Multiple value added streams possible
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Chitosan and Color/Fat Removal
Chitosan is added to whey and binds to annattoA chitosan/fat/color complex is flocculated and removed by microfiltration
Damodaran, 1995, US Patent No. 5,436,014Hwang D-C and S. Damodaran. 1995. Selective
precipitation and removal of lipids from cheese whey using chitosan. Journal of Agriculture Food Chemistry 43: 33.
Untreated Chitosan
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Possibilities - Membranes
Finer fractionationα and β enhanced fractions
Membranes that fill the gap700 dalton NF (loose NF/tight UF)50 to 100 kdalton UF
NF membranes are the new opportunity
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Possibilities - Europe
More demineralized whey (NF)Due to high volume of acid whey from quark
Quotas removed in Europe next yearExtra milk supplyWill add cows despite high price of landMF protein productionIreland – not making cheese but powder insteadExample: Glanbia and Waterford
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Drivers
EuropeMore milk with quotas removedLess regulatory issues regarding MF products
Pepsi, Coke, etc.Want diversification into protein beveragesBeverages big driver but will the new products be seen as dairy beverages?
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Drivers (continued)
ChinaBigger consumer than people thinkInternal quality issuesWill not be exportingNot a consumer of fluid (drinking) milkInfant formula#1 dessert is ice cream
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Hurdles to Technology
RegulatoryFDA stance on MF vs UF for cheesemilk
Applications for end productsLow concentrations of some components and cost to produceWhat to do with the byproducts?
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Hurdles to Technology (continued)
Because the market for a new ingredient does not exist yet, marketing cannot supply demand numbers and without demand numbers project to produce the new ingredient cannot get approval but if there is no ingredient then how does the demand develop? – Catch 22
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Program funding provided by Wisconsin Milk Marketing Board and Dairy Management, Inc.