lipid oxidation n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Lipid Oxidation PowerPoint Presentation
Download Presentation
Lipid Oxidation

Loading in 2 Seconds...

play fullscreen
1 / 14

Lipid Oxidation - PowerPoint PPT Presentation


  • 104 Views
  • Uploaded on

Lipid Oxidation. FDSC400. Types of Rancidity. Hydrolytic rancidity Lipase Free fatty acids provide aroma Oxidative rancidity Radical oxidation Aldehydes and other compounds provide aroma. Oxidative Rancidity. Part 1: Form lipid hydroperoxides Part 2: Break down lipid hydroperoxides.

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

PowerPoint Slideshow about 'Lipid Oxidation' - brady-fry


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
types of rancidity
Types of Rancidity
  • Hydrolytic rancidity
    • Lipase
    • Free fatty acids provide aroma
  • Oxidative rancidity
    • Radical oxidation
    • Aldehydes and other compounds provide aroma
oxidative rancidity
Oxidative Rancidity
  • Part 1: Form lipid hydroperoxides
  • Part 2: Break down lipid hydroperoxides
oxidative rancidity1
Oxidative Rancidity
  • Initiation
    • A radical is formed
  • Propagation
    • Radicals react and transfer their unpaired electron to other compounds
  • Termination
    • Two radicals combine to stop the reaction
the pentadiene structure
The Pentadiene Structure

RH R

H

.

…Radical Migration

addition of oxygen propagation
Addition of Oxygen - Propagation -

.

.

R +O2 ROO

ROO +RH ROOH +R

.

.

Each methylene interrupter can lead to three possible lipid hydroperoxides!

factors affecting rate
Factors affecting rate
  • Fatty acid composition
  • Temperature
  • Water activity
  • Metal ions
  • Oxygen
  • Light
antioxidants
Metal chelatorscitrate, EDTA

Radical scavengers (primary and secondary)

BHA, BHT, tocopherol

Antioxidants
e g w 3 pufa supplemented yogurt
e.g.: w3 PUFA Supplemented Yogurt

water

w3 oil

Homogenize

Pasteurize

Store/ship

w3 emulsion

milk

Culture ingredients

Pasteurize Homogenize Pack Ferment Store