Bio and Food

Date: 9/10/2012

Title: Carbohydrates: monosaccharides & disaccharides

Objective: To investigate the physical, functional and sensual properties of carbohydrates

Introduction: Carbohydrates are the main energy source for human. There are different types of carbohydrates, monosaccharide, disaccharide and polysaccharide. Although different types of carbohydrates have different properties, they are important in human body, for example, glucose, glycogen, lactose, etc. This practical will examine the different properties of different types of carbohydrates.

Materials: As in the manual

Procedure: As in the manual

Result:
1) Relative Solubility of Carbohydrates, Glucose & Galactose

|Type of carbohydrates |Glucose |Galactose |
|The weight of beaker(g) |36.38 |34.61 |
|The weight of beaker with water(g)|46.51 |44.94 |
|The weight of water(g) |10.13 |10.33 |
|The weight of carbohydrates |5.55 |1.65 |
|added(g) | | |

Table showing the weight of carbohydrates used, the weight of beakers containing the carbohydrates, and the weight of water used to dissolve the carbohydrates

Saturation point of glucose: 5.55×1000÷10.13=547.88mg/ml
Saturation point of galactose: 1.65×1000÷10.33=159.73mg/ml

2) Relative Sweetness and Taste Threshold

Bottle no.1 has the lowest concentration of the carbohydrates while bottle no.10 has the highest concentration of the carbohydrates.

|Groupmate |1 |2 |3 |4 |5 |
|Bottle no. of sucrose |4 |4 |3 |3 |2 |
|solution | | | | | |
|Bottle no. of glucose |7