We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byElijah Shier
Modified about 1 year ago
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
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 RHR H. …Radical Migration
Addition of Oxygen - Propagation - R+O 2 ROO ROO +RHROOH+R.... Each methylene interrupter can lead to three possible lipid hydroperoxides!
Part 2: Hydroperoxide Breakdown (1) (2)
Factors affecting rate Fatty acid composition Temperature Water activity Metal ions Oxygen Light
Antioxidants Metal chelators citrate, EDTA Radical scavengers (primary and secondary) BHA, BHT, tocopherol
Radical Scavenging Antioxidants
e.g.: 3 PUFA Supplemented Yogurt w3 oil water w3 emulsionmilkCulture ingredients Pasteurize Homogenize Pack Ferment Store Pasteurize Store/ship Homogenize
Antioxidants. Oxidation of food Oxidation reactions can occur when food is exposed to oxygen in the air. Foods containing fats or oils are at the greatest.
TY 2003 Organic Mechanism 3 Reaction of Chlorine with Methane.
N ATURE ’ S C HEMISTRY Oxidation of Food. A LCOHOLS Alcohols make up a group of organic compounds which contain the -OH group, called the hydroxyl group.
Chemical Reactions. 4 Basic Types of Chemical Rxns Synthesis Decomposition Single Replacement Double Replacement.
Chemical Reaction Types. 5 Reaction Types Synthesis Decomposition Combustion Single Replacement Double Replacement.
Photosynthesis The Flow of Energy. ATP adenosine triphosphate chemical compound used by living things to store energy When the bond between two.
Copyright 2009, John Wiley & Sons, Inc. Unit 2: Biochemistry and Cells Review.
True or false? A food industry food chain can be represented as… sun producer primary consumer secondary consumer 1.
End Show 2–3 Carbon Compounds Slide 1 of 37 Copyright Pearson Prentice Hall Macromolecules Four groups of organic compounds found in living things are:
Major Classes of Reactions If you can classify a reaction into one of five major categories by recognizing patterns that occur, you already know a lot.
Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Energy in Living Systems Directly or indirectly, almost all of the.
Chapter 2, Section 2. Interactions of Atoms Compounds – Atoms of more than one type of element that have been chemically bonded together – Often have.
Organic Chemistry Chemistry of Carbon Molecules. Carbon 4 electrons in outer energy level. Needs to form four covalent bonds to become stable. Can form.
First Semester Fall Mr. Retzbach. Get to know each other What is expected of you. What you can expect from me. Syllabus/Textbooks.
7.2 Ionic Bonds and Ionic Compounds > 1 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. Chapter 7 Ionic and Metallic Bonding.
Acids, Bases, and Solutions A hydrogen ion (H + ) is an atom of hydrogen that has lost its electron. An acid is any substance that produces hydrogen ions.
Chapter 25: Metabolism. Introduction to Cellular Metabolism Figure 25–1 Formation of Organic Molecules Energy production begins in cytosol Energy is captured.
1 Amino Acids, Proteins, and Enzymes Enzymes Enzyme Action Factors Affecting Enzyme Action Enzyme Inhibition.
Introduction – all forms of life depend directly or indirectly on light energy captured during photosynthesis – glucose molecules are broken down back.
1 AUTOMOTIVE BATTERIES Battery function Battery parts Chemical actions Discharge cycle Charge cycle Battery ratings Battery Maintenance Charging Jumping.
Microbial Nutrition Cell metabolism. Nutritional Categories of Microorganisms Microorganisms are often grouped according to the sources of energy they.
Organic Synthesis Notation Chemistry Advanced Higher.
Chemistry in Biology 6. The Big Idea Atoms are the foundation of biological chemistry and the building blocks of all living things.
Chapter 8.3 The Reaction of Photosynthesis. The Chloroplast Site of photosynthesis.
Chapter 6 Chemistry in Biology 6.1 Atoms, Elements & Compounds 6.2 Chemical Reactions 6.3 Water and Solutions 6.4 The Building Blocks of Life.
Copyright © 2012 Pearson Education, Inc. 8 C H A P T E R Nutrients Involved in Antioxidant Function and In Depth.
ELAINE N. MARIEB EIGHTH EDITION 2 Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings PowerPoint ® Lecture Slide Presentation by.
Chemistry in Biology. Elements in the Human Body (CHON 96%)
Oxidation-Reduction Reactions “Redox” LEO SAYS GER.
© 2016 SlidePlayer.com Inc. All rights reserved.