07-Proteins

07-Proteins - Average Fatty Acid Composition of Fats &...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 What’s with the OMEGA numbers? Nutritionists are interested in the end of the molecule farthest from the acid group So the “last carbon” is like the last letter of the Greek alphabet — ! They number in from the (omega) end until they come to the 1st double bond ! 9 ! 6 ! 3 Fats&Oils 16:0 18:0 18:1 18:2 18:3 Soybean 11 4 22 53 8 Canola 4 2 56 26 10 Sunflower 6 5 20 69 - Corn 13 3 31 52 1 Olive 10 2 78 7 1 Palm 44 4 40 10 - Lard 27 11 44 11 - Tallow 27 7 48 2 - Average Fatty Acid Composition of Fats & Oils (% by wt) Unsaturated fatty acids are unstable with oxygen Oxygen will attack the double bonds in an unsaturated fatty acid The reaction with oxygen can break a unsaturated fatty acid into smaller molecules which have more aroma (smell) than the original fatty acid. These fragments may have unwanted effects of health. The more unsaturated the fatty acid is (that is the more double bonds): the more reactive it is with oxygen. Lipid Oxidation Paradox Saturated fatty acids (no double bonds) Slow to oxidize (good) Increased risk of heart disease (bad) Polyunsaturated fatty acids (multiple double bonds) Rapidly oxidized (bad) Decreased risk of heart disease (good) Monounsaturated fatty acids good! (Oleic acid)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 New York City passes trans fat ban NYC to restaurants: No trans fat NEW YORK - The Board of Health voted Tuesday to make New York the nation’s first city to ban artery-clogging artificial trans fats at restaurants — from the corner pizzeria to high-end bakeries. Restaurants had to eliminate artificial trans fats from all of their foods by July 2008. Soy Bean Oil and Hydrogenation Soy bean oil contains a lot of poly- unsaturated fatty acids (which makes it an oil) To make a fat out of soy bean oil, the number of double bonds must be reduced. That is: these unsaturated fatty acids should be saturated with hydrogen! Hydrogenation C C H H + H 2 C C H H H H Unsaturated Saturated Hydrogen Gas But we do need to know a little more about Double Bonds Double Bonds • A double bond can exist in two ways, commonly referred to as CIS & TRANS double bonds
Background image of page 2
3 trans Fatty Acids are By-products of Hydrogenation C C H H Unsaturated & cis-fatty acid C C H H Unsaturated & trans-fatty acid By-product of Hydrogenation Even more about. .. Double Bonds Double Bonds Cis double bonds are formed in nature Trans double bonds are formed by synthetic chemistry processes called: Hydrogenation Trans fatty acids formed from “Hydrogenation” are Artificial “Synthetic” or “Un-Natural” Proteins, Amino Acids & Us Water accounts for 60-70% of our body weight, followed by amino acids (proteins) with 20%. Thus, a person weighing 50 kg consists of about 10 kg of proteins, which make up important tissues of the body such as muscles, gastrointestinal tract, internal organs, hemoglobin in the blood, and the collagen of our hair and skin.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

07-Proteins - Average Fatty Acid Composition of Fats &...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online