Understanding Ingredients. Fats and Oils
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1 Understanding Ingredients Fats and Oils
2 Topics Types of Fats and Oils Structures of Fats and Oils Nutritive Value of Fats and Oils Choice and Storage of Fats and Oils Uses of Fats and Oils in Cooking / Diet Food and Nutrition Labelling of Fats and Oils 2
3 Types of Fats and Oils 3
4 Types of Fats and Oils Fats and oils in cooking can be grouped into two categories: animal fats and plant oils Fats from animal source, e.g. lard, butter, margarine Oil from plant source, e.g. peanut oil, coconut oil, olive oil, corn oil, canola oil, sesame oil 4
5 Types of Fats and Oils Some fats are visible, some fats are invisible Visible fat, e.g. chicken skin, chicken feet, beef steak, salmon Invisible fat, e.g. deep-fried food, sausage, cream cake, biscuit with cream filling, pastry, chips, peanut 5
6 Other categories of fats and oils Rendered fat Rendered fat is the solid, usable fat derived from animal fat after it is heated and freed from connective tissue Food manufacturers render hog fat and process it to become lard (43% saturated fatty acids), or cattle fat to become tallow (48% saturated fatty acids) Both lard and tallow are used in food manufactures as ingredients because of their textural and flavour characteristics Lard is used in pastry to produce a highly desirable, flaky pie crust 6
7 Other categories of fats and oils Hydrogenated oil Hydrogenation is the process of adding hydrogen to unsaturated fatty acids to reduce the number of double bonds. Hydrogenation serves two purposes: To convert liquid oils to semisolid To increase the stability and shelf life of the fat Hydrogenation of unsaturated fatty acid is adding hydrogen gas to oil with catalyst, temperature and pressure control As the reaction progresses, trans fatty acids are produced gradually Trans fatty acids increase the melting point of the fat or oil and create a more solid product Studies have shown that intake of trans fatty acids is associated with increased risk of coronary artery disease Examples of hydrogenated oil: shortening and margarine 7
8 Other categories of fats and oils SOLUTION Liquid oil is too soft to spread Animal fat is too hard to spread Add hydrogen into liquid oil Spreadable hydrogenated oil 8
9 Other categories of fats and oils Margarine Fat content is the same as butter Produced from a range of vegetable fats and oils Used for a variety of food products to: assist aerating enhance flavour retain moisture in food create the crumbly and flaky texture of pastry Contains vitamin E Fortified margarine also contains vitamins A and D 9
10 Structures of Fats and Oils 10
11 Structures of Fats and Oils Lipid is the term that includes fats and oils Fats Animal source High proportion of saturated fatty acid Higher melting point Solid at room temperature (exception is salmon fish oil) Saturated fatty acids are precursors for making cholesterol in our body, they may increase risk of cardiovascular diseases Oils Plant source High proportion of polyunsaturated fatty acid Lower melting point Liquid at room temperature (exceptions are palm oil, coconut oil) Monounsaturated fatty acids are found to help reduce blood cholesterol, it may be helpful to prevent cardiovascular diseases 11
12 Structures of Fats and Oils Fats and oils are triglycerides, the major constituent of lipids In general, lipid includes the triglycerides, phospholipids and sterols 12
13 Structures of Fats and Oils Glycerides Include monoglycerides, diglycerides, and triglycerides The first two act as emulsifiers in foods More than 95% of fatty substance in food is triglycerides Fatty acid chain Glycerol Triglyceride 13
14 Structures of Fats and Oils Phospholipids The structure of phospholipids is similar to triglycerides but contain only two fatty acids It also contains lecithin, the same component that is found in egg yolk The primary source of lecithin is soybean A phospholipid forms a bridge between fat and water, therefore emulsification can be seen between two immiscible substances 14
15 Structures of Fats and Oils Sterols Sterols are round in shape Cholesterol is the primary animal sterol Cholesterol is vital to animal cell membrane structure and function as a precursor to fat-soluble vitamins and steroid hormones 15
16 Structures of Fats and Oils Fatty acids Fatty acids are long hydrocarbon chains with a methyl group (CH 3 ) at one end of the chain and a carboxylic acid group (COOH) at the other Most natural fatty acids contain from 4 to 24 carbon atoms and most contain an even number of carbon atoms in the chain Animal fats typically have 18 carbons in the fatty acid chain These long chains are made of various fatty acids and are chiefly saturated 16
17 Structures of Fats and Oils Fatty acids (cont d) In saturated fatty acids, there is only single carbon-tocarbon bonds, they have a linear shape Generally, saturated fatty acids are solid at room temperature and have high melting points 17
18 Structures of Fats and Oils 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Comparison of composition of dietary fat (Source: Canola Council of Canada) Saturated Fat Polyunsaturated Fat Alpha Linolenic Monounsaturated Fat 18
19 Structures of Fats and Oils Fatty acids (cont d) Fatty acids may also be unsaturated, containing one or more carbon-to-carbon double bonds Monounsaturated fatty acids contain only one double bond, such as oleic acid Polyunsaturated fatty acids contain two or more double bonds, such as linoleic and linolenic acids Generally, unsaturated fatty acids are liquid at room temperature and have low melting points 19
20 Structures of Fats and Oils Fatty acids (cont d) The double bonds in fatty acids occur in either cis or the trans configuration H \ / C = C / \ H Cis - the hydrogen atoms attached to the carbon atoms of the double bond are located on the same side of the double bond H H \ / C = C / \ H Trans - the hydrogen atoms are located on opposite sides of the double bond, across from one another 20
21 Nutritive Value of Fats and Oils 21
22 Nutritive Value of Fats and Oils Fat is a nutrient yielding high amount of energy The amount of energy provided by fats doubles the amount of energy provided by carbohydrates or protein of the same weight People enjoy fat in the diet due to its flavour mouthfeel, palatability, texture, and aroma 22
23 Choice and Storage of Fats and Oils 23
24 Choice and Storage of Fats and Oils Choose those that are well-packed and check the expiry date when buying Fats should be covered and stored in a refrigerator away from food with strong smells Oils should be stored at room temperature in airtight containers away from sunlight 24
25 Uses of Fats and Oils in Cooking / Diet 25
26 Uses of Fats and Oils in Cooking / Diet Function of fats and oils to human body: Provide energy to support daily activities and other physical activities as well as to keep the body warm Help to absorb fat-soluble vitamins (A, D, E and K) Precursor for synthesizing hormones to support normal function of the body 26
27 Uses of Fats and Oils in Cooking / Diet Functions of fats and oils in food preparation: Add or modify flavour, texture Aerate (leaven) batters and doughs Contribute flakiness Contribute tenderness Emulsify Transfer heat, such as in frying Prevent sticking 27
28 Food and Nutrition Labelling of Fats and Oils 28
29 Food and Nutrition Labelling of Fats and Oils Labelling of fats and oils is controlled in Hong Kong legislation: List of ingredients Prepackaged food shall be legibly marked or labelled with a list of ingredients List of allergenic substance If fats and oils contains allergenic substance, such as cereals containing gluten, peanuts, fish, soyabeans, and tree nuts, the name shall be specified in the list of ingredients Appropriate durability indication Indication of best before or use by date 29
30 Food and Nutrition Labelling of Fats and Oils Labelling of fats and oils is controlled in Hong Kong legislation: Nutrition labelling Prepackaged food shall be marked or labelled with its energy value and nutrient content Total fat, saturated fatty acids, and trans fatty acids are the nutrients associated with fats and oils that should be labelled on the package Nutrition claim If any nutrition claim is made on the food label or in any advertisement, the nutrient in concern shall be marked or labelled in the nutrition labelling 30
31 Food and Nutrition Labelling of Fats and Oils Legislative requirement on composition of milk and milk products Milk and milk products Lard Butter Margarine Legal requirement on fat percentage Not more than 1% of substances other than hog fat Not more than 1% of water Shall contain not less than 80% of milk fat, not more than 16% of water and not more than 4% of salt (sodium chloride) Shall contain neither more than 16% moisture nor more than 10% butter fat. 31
32 References Canola Council of Canada Hong Kong Legislation, Food and Drugs (Composition and Labelling) Regulations., Cap. 132W. Vickie A. Vaclavik, Elizabeth W. Christian. Essentials of food science. New York, NY: Springer, c
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