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Lecture notes

BioChemistry

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Lecture notes of 2 pages for the course BioChemistry at BU (BioChemistry)

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  • May 25, 2022
  • 2
  • 2020/2021
  • Lecture notes
  • Marke jebri
  • All classes
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hamzaelmansouri
Caloric Value of Food
Value of food is expressed in calories per gram. A calorie (written with a
small c) is the amount of heat required to raise temperature of 1 gram of
water by 1oC (more specifically from 15oC to 16oC). The large calories
(written with a capital C) or Kilocalarie is equal 1000 calories. In the
discussion of energy metabolism it is kilocalorie or Calorie (abbreviated
as Cal) which is used.

In order to determine amount of energy contained in various foodstuffs a
sample known weight is blace in a bomb calorimeter which is a metabolic
chamber having an arrangement for producing electric sparks. The bomb
calorimeter is surrounded by a known amount of water whose
temperature is noted down. A spark is produced and the foodstuff is
ignited. The combustion of the foodstuff produces heat which serves to
raise the temperature of the surrounding water. The temperature of water
is again noted and rise in its temperature found out. From the rise in the
temperature of the water the total heat given off in this process can be
easily found out. Average values of the heat combustion for different
food stuffs are given below:

Carbohydrate ------ 4.1 Cals/gram
Fat ------ 9.4 Cals/gram
Protein ------ 5.6 Cals/gram

The heats of combustion of carbohydrates and fats as determined by this
method are found to the same as that produced within the human body.

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