antioxidants n.
Skip this Video
Download Presentation

Loading in 2 Seconds...

play fullscreen
1 / 9

Antioxidants - PowerPoint PPT Presentation

  • Uploaded on

Antioxidants. TBHQ. BHT. BHA. Ascorbic Acid. Propyl Gallate. Antioxidants. BHA

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Antioxidants' - otylia

Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript




Ascorbic Acid

Propyl Gallate

  • BHA
    • Butylated hydroxy anisole is a mixture of two isomers. Referred to as a 'hindered phenol' because of the proximity of the tertiary butyl group to the hydroxyl group. This may hinder the effectiveness in vegetable oils, but increase the 'carry through' potency for which BHA is known.
    • Uses: Lard, shortenings, vegetable oils, cereals, package liners, potato products, dry soups, chewing gum, etc. Usually in combination with other primary antioxidants.
  • Propyl Gallate
    • Three hydroxyl groups make it very reactive. Lower solubility. Tend to chelate trace minerals such as iron and form colored complexes. Are heat labile, especially under alkaline conditions.
    • Uses: Lard, shortening, vegetable oils, cereals, package liners, animal feeds, etc. Used alone and in combination with BHA or PG and citric acid.
  • BHT
    • Butylated hydroxy toluene is also a 'sterically hindered' phenol Susceptible to loss through volatilization in high temperature applications.
    • Uses: Lard, shortening, vegetable oils, cereals, animal feeds, etc. Usually used in combination with BHA or BHT and citric acid.
  • TBHQ
    • Tertiary-butylatedhydroquinone is an extremely potent antioxidant. Had been used extensively in non food applications prior to gaining approval in food.
    • Uses: Lard, cottonseed oil, potato chips, corn flakes
  • Combinations
    • Antioxidants are usually combined to take advantage of their differing properties.
    • For example BHA may be combined with PG and citric acid. The citrate chelates metals, the propyl gallate provides a high level of initial protection while the BHA has good carry through properties.
  • Reasons for Combinations
    • Take advantage of different properties
    • Allow for better control and accuracy
    • May provide synergistic effects
    • Combinations may provide more complete distribution in some foods
    • More convenient to handle

Stability of

Bakery Products

(AOM –

Days of stability)


Uses of Antioxidants

  • Fats and oils (less effective in higher polyunsaturates)
  • Foods made with fats (potato chips, nuts, candies, pre-mixes, frozen pies)
  • Foods with fatty constituents (peppers, other spices, cereals, dehydrated vegetables, citrus oils, chewing gum)

Natural Antioxidants

  • Should not cause off flavors or colors
  • Must be lipid soluble
  • Must be non toxic
  • Should have carry through properties
  • Must be cost-effective
natural antioxidants
Natural Antioxidants


natural antioxidants1
Natural Antioxidants


Contains sesamol. Reported to be more effective in lard than BHA or BHT.

natural antioxidants2
Natural Antioxidants
  • Oats Oats have been long recognized to have antioxidant properties. Over 25 phenolic compounds have been identified in oats. Many derived from caffeic and ferulic acid.