The More The Merrier

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The More The Merrier

  1. 1. THE MORETHE MERRIER Bacterial Fermentation AZFATINI BT NAWI D20081032320 ZETY LIYANA BT ZAINALABIDIN D20081032351 SYAFIQAH SHAARI D20091034832 YIP SOOK HAN D20091034841
  2. 2. SCIENTIFIC CONCEPT  Fermentation is the conversion of a carbohydrate such as sugar into an acid or alcohol.  Fermentation can be performed by yeast and some types of bacteria.  Milk is contaminated by bacteria even before it leaves the udder, although at this point they are harmless and few in numbers.  The two main groups of bacteria in milk are Lactic acids and coliforms. Lactic acid is the normal bacteria present in milk and dairy products. Coliforms are the main reason for milk spoilage.
  3. 3. ENGAGE Before After 1 day A glass of fresh milk was left for one day. It smells sour and even foul after that. What happen to the milk?
  4. 4. ENGAGE Planning and Doing Experiment – observation of the change in pH when the milk is left for 1 day.
  5. 5. EMPOWER Result Time (hour) pH Time (hour) pH 1 5.442 13 5.186 2 5.442 14 5.174 3 5.442 15 5.158 4 5.380 16 5.149 5 5.360 17 5.142 6 5.340 18 5.133 7 5.299 19 5.121 8 5.278 20 5.117 9 5.258 21 5.112 10 5.237 22 5.096 11 5.230 23 5.074 12 5.197 24 5.063
  6. 6. EMPOWER Graph 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 pH Time (hour) pH versus Time (hour) pH
  7. 7. EMPOWER Discussion 1. Observe and explain the change of pH after starting the experiment from the graph given. 2. What causes the reduction in the pH of milk? 3. Describe the speed of change in pH the whole experiment period? 4. Calculate the extent of change in pH obtained in the process.
  8. 8. ENHANCE School Milk Program has to be postponed for a time being because the food poisoning case among students due to milk spoilage. Based on your opinion, what are the factors that cause the milk spoilage?
  9. 9. UNIQUE FEATURES By using data logger, we do not need to make a constant observation. The slightly changes in the pH values are able to be observed. We do not need to use pH test papers during the whole experiment.
  10. 10. REFERENCE Measuring the pH of Milk. Retrieved on 31st August 2010 from http://www.picotech.com/experiments/ ph_of_milk/ph_of-milk.html
  11. 11. The End Thank You

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