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Recap

Recap. Two foods that are rich in protein? Two foods that are rich in carbohydrates? How do we know cooking is a chemical reaction? What is the chemical name of baking powder? How does it help cakes to rise?. How did Christopher Columbus stop meat from going rotten on board his ship?.

clementine-giles
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Recap

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  1. Recap • Two foods that are rich in protein? • Two foods that are rich in carbohydrates? • How do we know cooking is a chemical reaction? • What is the chemical name of baking powder? • How does it help cakes to rise?

  2. How did Christopher Columbus stop meat from going rotten on board his ship?

  3. An experiment to start you thinking…. CO2 N2 O2 Vacuum What will happen to the apple in each of the tubes shown?

  4. An experiment to start you thinking…. CO2 N2 O2 Vacuum Answer: ONLY the one that contains oxygen shows signs of browning.

  5. An apple turns brown when left in the air. What is happening? Could we stop it doing this?

  6. Ingredients: Pork Sausages Pork shoulder (49%), pork belly (22%), pork fat (4%), water, rusk, sage, stabiliser (diphosphates), salt, wheat dextrose, thyme, preservative (sodium metabisulphite), white pepper, yeast extract, spice extracts, antioxidant (ascorbic acid), herb extracts. Reading the Label • What order do you think ingredients are listed in? • Which ingredient is there least of? • Is everything named on this list?

  7. Big picture… What do you think this is?

  8. Why are food additives used? 20 November 2014 MUST: give some examples of when food additives are used. SHOULD: Describe some advantages and disadvantages of using additives COULD: describe an example of intelligent food packaging

  9. Would you eat this? Water, sugar, cellulose, monosodium glutamade (E621), carotene (E160A), lycopene, riboflavin (E101), ascorbic acid (E300), citric acid (E330), malic acid (E296), oxalic acid, flavourings

  10. Would you eat this? Lecithins (E322), cephalins, lysophosphiatidyl, cholines, spingomyellins, cholesterol, amino acids, avidin, lutein (E161B), zeaxanthin, pyridoxine, cobalmin, biotin, cholecalciferol

  11. Chemicals in food • How much of the food you eat is chemicals? • Can you give some examples? • Video clip of Heston Blumenthal • All our food is made from chemicals. • We add chemicals (additives) to food for different reasons. • Sometimes these are natural additives, sometimes they are artificial additives.

  12. Stop food reacting with oxygen and “going bad” Makes food look more attractive Helps oil and water in foods to mix properly Makes food taste better

  13. Food Additives & Allergies : Web links http://news.bbc.co.uk/1/hi/health/2356163.stm- a 2002 news story about additives. http://www.faia.org.uk/foodallergy.php - the stats on food allergies Click here for screen shots of same sites: BBC news Food additives and allergies

  14. Click to return

  15. Click to return

  16. Food additives – good or bad?

  17. Find this bit of the poster. Use it to complete the next slide

  18. In your books ……. Write down FIVE sentences about food additives. Use the poster to help you.

  19. Food Additives: Their effect on health Additives can affect your health. S______ compounds with E numbers E220  E228 can destroy v______ . They can also trigger a_______ attacks Some chemicals were once used as fabric d_____ and are now found in food. A well known one is T________. They are used as colourings and may cause behaviour problems in young children. Many people are allergic to f____ as well as food additives. This is thought to be much more common Words to fill in: tartrazine, asthma, vitamins, sulphur, dyes, foods

  20. So…what do you know? • Use the ‘Additives’ poster to find out about sausages! • What type of additives are the following? • E450, E412, E300 & E307, E223, E128 • Reminder – what are the following used for in foods? • Flavourings, antioxidants, colours, emulsifiers Bonus question: How many kilos of food additives do we eat per year?

  21. Advantage or disadvantage? Some E-number chemicals have been found to cause asthma attacks in children.

  22. Advantage or disadvantage? Emulsifiers are added to ketchup to stop the oil and water ingredients separating.

  23. Advantage or disadvantage? Antioxidants help foods last longer before they “spoil”.

  24. Advantage or disadvantage? Tartrazine is a food colouring that can cause behaviour changes in young children.

  25. Advantage or disadvantage? Ascorbic acid is added to tinned fruit. It helps the fruit last longer.

  26. The Self Cooling Beer Can

  27. The Self Heating Coffee Can

  28. The oxygen absorber comes in the form of a sachet, self adhesive label or rigid thermoformed "Oxycap".

  29. Once a product has been sealed with the O2 absorber inside, the absorption process takes several hours to complete. At the end of this period, the level of oxygen within the packaging has been reduced from the 20.9% normally present in air to less than 0.01%. The absorber continues to work both on the oxygen present within the food itself and on any which permeates through the packaging until the food is used. As well as preventing bacterial growth the O2 absorber eliminates the oxidation which can adversely affect the flavour, odour, and colour of a product.

  30. A Time-Temperature Indicator is being used to monitor the temperature history of refrigerated salmon filets packed in foamed polystyrene boxes. 

  31. European Union (EU) legislation requires most additives used in foods to be labelled clearly in the list of ingredients, either by name or by an E number. This allows you to avoid foods containing specific additives if you wish. Giving an additive an E number means that it has passed safety tests and has been approved for use here and in the rest of the EU.

  32. Pros and cons of food additives

  33. Innocent's primary selling point is their exclusive use of pure, fresh ingredients in all of their drinks. The innocent promise states "...that anything innocent produces will always taste good and do you good. We promise we'll never use concentrates, preservatives, stabilisers, or any weird stuff in our drinks". Innocent claims to be "committed to running its business in a sustainable way" and runs programmes on recycling, ethical business, reducing carbon emissions and charity work.

  34. Can you now… • Give some examples of when food additives are used? • Say which is the best antioxidant for apple? • Describe some advantages and disadvantages of using additives.

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