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Antioxidants University of Tennessee PowerPoint Presentation

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Slide 1 - Antioxidants BHA BHT TBHQ Propyl Gallate Ascorbic Acid
Slide 2 - Antioxidants 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
Slide 3 - Antioxidants 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
Slide 4 - Antioxidants Stability of Bakery Products (AOM – Days of stability)
Slide 5 - Antioxidants 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)
Slide 6 - Antioxidants 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
Slide 7 - Natural Antioxidants Rosmariquinone
Slide 8 - Natural Antioxidants Sesame Contains sesamol. Reported to be more effective in lard than BHA or BHT.
Slide 9 - 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.
 

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