Food Dehydration - PowerPoint PPT Presentation

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Title:

Food Dehydration

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Reverse Osmosis. Flash Evaporator. Thin Film Evaporator. Ultra-filtration & Reverse Osmosis. Changes During Concentration. Cooked flavor. Darkening of product ... – PowerPoint PPT presentation

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Title: Food Dehydration


1
CHAPTER 10
  • Food Dehydration
  • Concentration

2
Water is Removed
  • Under natural field conditions
  • grains, raisins, seeds
  • Cooking/baking
  • Controlled dehydration processes

3
Dehydration vs. Concentration
  • Dehydration - almost complete removal of water
  • dried milk, coffee, corn flakes
  • Concentration
  • condensed milk, syrups, flavorings

4
Dehydration Principle
  • Apply Heat / Remove Water
  • Enhanced by
  • Increased surface area
  • Increased temperature
  • Increased air velocity
  • Reduced humidity
  • Reduced pressure (vacuum)

5
Drying Methods Equipment
  • Air convection driers
  • Drum or Roller drying
  • Vacuum drying

6
Air Convection Driers
7
Cabinet or Tray Drier
8
Tunnel Drier
9
Fluidized Bed Drier
10
Spray Drier
11
Drum or Roller Driers
12
Vacuum Belt Drier
13
FOOD CONCENTRATION
14
Concentration Benefits(similar to dehydration
benefits)
  • Form of preservation (maybe)
  • Reduces weight
  • Reduces volume

15
Methods of Concentration
  • Solar
  • Open Kettles
  • Flash Evaporators
  • Thin Film Evaporators
  • Vacuum Evaporators
  • Freeze Concentration
  • Reverse Osmosis

16
Flash Evaporator
17
Thin Film Evaporator
18
Ultra-filtration Reverse Osmosis
19
Changes During Concentration
  • Cooked flavor
  • Darkening of product
  • Nutritional changes
  • Some microbial destruction possible
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