What are the risk factors for cardiovascular disease?

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What are the risk factors for cardiovascular
disease?
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(No Transcript)
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Vitamin C

• connective tissue
• bones
• teeth
• skin
• internal endothelial surfaces

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Arteriosclerosis
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Which foods contain Vitamin C?
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By the end of the lesson you should be able to

• describe how to investigate the vitamin C content
  of food and drink. (D/E)
• calculate the concentration of Vitamin C for
  various fruit based drinks. (B/C)
• explain why vitamin C is needed by humans with
  specific reference to CVD (A)

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Practical investigation
Determination of the concentration of vitamin C
by using DCPIP test
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DCPIP Dichlorophenol-indophenol
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Carton Orange Juice
Freshly squeezed orange juice
Orange Squash
Lemon Juice
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A few steps in titration
Juice titrates against DCPIP solution
DCPIP solution changes to pink colour
DCPIP solution changes to colourless
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Precaution
Drop size must be constant. Press the squeezing
syringe gently.
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During determination, the dropper must be held
vertical and the fruit juice should not flow down
the side of the test tube.
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At least three experimental trials must be taken
and the average number of drops calculated.
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Question
To decolourize the DCPIP solution
Which one gets more vitamin C in it ?
Answer juice A
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How to work out the concentration of vitamin C in
different juices?
Concentration of vitamin C in fruit juice
Volume of standard solution Volume of fresh
juice
Concentration of standard solution
X
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By the end of the lesson you should be able to

• describe how to investigate the vitamin C content
  of food and drink. (D/E)
• calculate the concentration of Vitamin C for
  various fruit based drinks. (B/C)
• explain why vitamin C is needed by humans with
  specific reference to CVD (A)

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Homework

• You will need to write this experiment up at
  home.
• Use the QIS Biology department website
• qisbiology.edublogs.org
• Then email your report to me at
• strachanm_at_qis.org