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WEEK: 8
Topic: Scientific study of foods.
Content:
- Measurement, units and accuracy
- Protein tests; (i) action of heat on complex protein (ii) foam test of alcohol on complex protein (iii) millions test.
Sub topic 1: Measurement, units and accuracy
Man at different stages in life requires different amounts of nutrients to get to the desired effects in the body. Different food nutrients need to be identified by carrying out some scientific tests in order to ascertain the different quantities in different foods.
Measurement:
This is the act or process of discovering exact size or amount of something.
Unit:
This is the standard measure which is used to express amounts. For example, gram me is a unit of weight.
Accuracy:
This is the means to be correct, exact and avoid mistakes. Measurement in foods and nutrition requires accuracy. This is the very essential so as to get good results.
Energy measurement in food nutrients
Energy value of foods or energy needs of the body are measured in calories or joules. A larger unit known as kilocalories can be used. The most common unit of measuring energy is known as the kilocalories.
For example:
1 gm of carbohydrate (glucose) =4 kcal of energy
1gm of protein (amino acids) =4 kcal of energy
1 gm of fat (fatty acids) =9 kcal of energy
1kcal is equivalent to 3.142kilojoules.
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