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Note to teacher

Note to teacher. You will need to requisition equipment to complete practical on testing washing powders on their ability to remove stains. Bell Work. What are enzymes and what do they do? Discuss your answer with the people on your table. B6g Lesson 1. Everyday uses of enzymes.

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Note to teacher

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  1. Note to teacher • You will need to requisition equipment to complete practical on testing washing powders on their ability to remove stains.

  2. Bell Work • What are enzymes and what do they do? • Discuss your answer with the people on your table.

  3. B6g Lesson 1 Everyday uses of enzymes • Lesson Objectives • To explain how enzymes work in different situations • Success Criteria • Explain how we can use enzymes • Explain how enzymes work • Complete practical using enzymes

  4. Where do we use enzymes? • Cheese making • Extract fruit from juice • Alter and improve flavour of food • In medical products such as reagent sticks that test for glucose in urine • In biological washing powders to break down food stains.

  5. Use of enzymes to sweeten food. • Sucrose (sugar) is the most common sort of sugar found in foods • Sucrose is a Disaccharide made up of two smaller sugars: fructose and glucose. • Sucrose can be broken down into the smaller sugars using the sucrase enzyme (sometimes called invertase)

  6. Breaking down sucrose • Fructose and glucose are much sweeter than sucrose and so they are very useful. • They are used to flavour desserts and sweets. sucrose Fructose + glucose sucrase

  7. The use of enzymes in biological washing powders. • Stain on clothes are made from large insoluble molecules which are hard to wash away. • Three types of enzyme are used to break down different stains so that they will easily wash out of clothes.

  8. The enzymes used.

  9. Optimum conditions for enzymes • Enzymes work best at low temperatures • Between 30oC – 40oC • They also work best at about pH7 • In areas which have very acidic or alkaline tap water, the enzymes don’t work as well. • This is because the shape of the enzyme is changed by the extreme pH and they can no longer function.

  10. How well do biological washing powders work • You will be given a range of washing powders and in groups need to design an investigation to see which one is the best at removing stains. • You need to think about your variables, your method and what equipment you will need. • Your teacher will let you know when you can start the investigation.

  11. What did you find out? • Which powder worked the best? • How do you know this? • How could you improve your investigation if you were to do it again?

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