T.V.E FOOD TECHNOLOGY Q4 REVIEWER

• Food Drying - It is a method of food preservation in which food is dried.
• The Nutritive Value of food is affected by the dehydration process.
• Blanching - Vegetables are treated using steam or water blanching prior to drying and freezing.
• Food Dehydration - It is a process of reducing moisture of food to low levels for improved shelf life.
• Enzymes - These are substances in food which promote a chemical reaction.
• Pre-treatment - Fruits and vegetables are pre-treated before drying to help slow such enzymatic reaction.
• Tools

  • Trays and Racks

  • Oven Thermometer

  • Kitchen Scale

  • String

  • Mesh Screen
• Materials

  • Zip Bags
  • Glass Jars
  • Permanent Marker
• Equipment/Dryers

  • Spray Dryers
  • Tray Dryers
  • Drum Dryers
  • Tunnel Dryers
  • Freeze Dryers
  • Solar Dryers
  • Food Dehydrator
• Selecting and preparing fruit and vegetables

  Fruit must be:

  • Firm
  • Mature
  • No bruises

  Vegetables must be:

  • Low moisture content
  • Absence of defects
• Types of Blanching

  • Syrup Blanching
  • Steam Blanching
• Pre-treatment methods

  • Blanching
  • Ascorbic Acid
  • Sulfuring
• Food Additives - These are natural substances added to food to preserve flavor or enhance taste.
• Food Preservatives - Substances, both natural and artificial, that are added to a variety of goods.
• Air temperature and circulation - Must be controlled during the drying process.
• Air Flow - It's extremely important in removing moisture from food.
• Ventilation - Place a fan outside the oven door to aid air circulation.
• After Drying - Even when a food tests dry, it may not be uniformly dry.
• Conditioning - It is the process used to equalize, or evenly distribute, moisture left in the food after drying.
• Caution - If any sign of mold growth occurs, destroy the product.
• Drying methods

  • Sun Drying
  • Solar Drying
  • Oven Drying
  • Electric Dehydrator
• Sun Drying - It is the evaporation of water from products by sun or solar heat.
• Solar Drying - Is a modification of sun drying in which the sun's rays are collected inside a specially designed unit with adequate ventilation for removal of moist air.
• Air Drying - It is an alternative to sun drying. The material is tied into bunches or strung on a string and suspended out of the sun until dry.
• Less Tender Herbs

  • Rosemary
  • Sage
  • Thyme
  • Summer Savory
  • Parsley
• Tender Leaf Herbs

  • Basil
  • Oregano
  • Tarragon
  • Lemon Balm
  • Mints
• Oven Drying - By combining the factors of heat, low humidity and air current.
• Types of Dehydrators

  • Solar Dehydrator
  • Electric Dehydrator