NUTR 3210 Lecture Notes - Lecture 4: Calorimeter, Antoine Lavoisier, Max Rubner
9 Feb 2018
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Cellular source of energy = atp: sustains physical energy, anabolism (synthesis of complex molecules), active transport, etc, this cellular source of energy is supplied by the macronutrients in the diet. So, what is the energy value of a food: calorie (cal): measure of heat kcal = 1000 calories = 1 calorie = 1 cal (1 kilocalorie = 1 food calorie) *important! Energy required to raise the temperature of 1kg (1l) of water by 1 c. Antoine lavoisier (mid 1700s: compared heat produced by a guinea pig w/ the production of co2. Ice calorimeter (heat produced estimated by the amount of ice that melts: co2 formed from the reaction b/n oxygen and organic matter. Justin liebig recognized that protein, carbohydrates, and fats are oxidized by the body. Max rubner measured energy values of certain foods to determine caloric content. Use heat as an indicator of the amount of energy stored in the chemical bonds of foods (carbon-hydrogen bonds)
