Micronutrients:Vitamin C

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Sources:

  • fresh fruit and vegetables
  • citrus fruits (oranges, lemons, limes and tangerines)
  • cantaloupe melon,
  • strawberries
  • black currants
  • green peppers
  • tomatoes
  • broccoli
  • kiwi fruit
  • dark green leafy vegetables
  • peppers
  • potatoes - 90% of recommended daily intake of vitamin C

Functions:

  • required for growth & helps to make collagen - important protein found in skin liagments and the walls of blood vessels
  • essential for repair and maintenance  of cartilage, bones and teeth
  • repair and tissues including the healing of wounds and development of scar tissue
  • assists formation of red blood cells by helping the absorption of iron from the intestines - iron is an important building block of red blood cells
  • vital role in immune system & function of lymphocytes to fight infection
  • antioxidant works with vitamin E to block some of the damage caused by the free radicals, which are by product that result when the body converts food into energy- may reduce risk of coronary heart disease.

Deficiency:

  • prone to infection
  • slows metabolism
  • reduces appetite
  • wounds are slower to heal
  • dental and gum problems can develop
  • when body stores of vitamin C drop below 300 milligrams, spongy gums tooth loss and bleeding from all mucous membranes will develop.

Excess:

  • stomach pain & diarrhoea

Effects of storage, preparation and cooking:

  • all water soluble vitamins are easily dissolved in water and unstable and affected by a range of factors including; heat, light, alkalinity, oxygen, enzyme activity
  • most sensitive vitamin to destruction by these factors
  • fruit and veg good source but can be exposed to these factors thereby reducing their vitamin content

Storage:

  • conditions of the fruit- avoid purchasing bruised or damaged fruit and veg as cell walls are broken & enzymes released destroying vitamin C content. ascorbic acid oxidise is released by bruising, cutting, slicing and exposure to air. 
  • Age of fruits and vegetable- quantity of…

Comments

samlee

do u know anything about the Dcpip method for testing for testing for vitamin c

Really need it for my SCIENCE COURSEWORK CONTROLLED ASSESMENT!!!!!!:(

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