Yeast Reproduction in Sugar Substitutes Tracey Merz Grade 9 The Academy of Notre Dame de Namur

Problem Will yeast reproduce using different sugar substitutes?

Research

Hypothesis Yeast is a single-celled organism that produces carbon dioxide when it is fed sugar, and sugar substitutes have a very different chemical makeup than sugar, so yeast will not reproduce as much as it does with sugar while using sugar substitutes. The hypothesis states that using sugar substitutes will create less carbon dioxide than is created with normal sugar.

Materials -Yeast -Water -Sugar Substitutes/Sugar -Syringes -Graduated Cylinder -Thermometer -Bread Ingredients: -Water -Butter -Flour -Sugar/Sugar Substitute -Dry Milk -Salt -Yeast

Procedure Part One: First, the water was heated to 40 degrees Celsius. Then, yeast and water were combined, and stirred vigorously until foaming. Next, a yeast/sugar solution was made for each type of sugar to be tested. Each yeast solution contained 20 ml of water, 2 g of sugar or sugar substitute, and 10 ml of the yeast and water mixture. Next, the yeast/sugar solutions were mixed until combined. Then, a sampling of each yeast/sugar solution was pumped into a syringe to the top and the end was sealed with duct tape. The amount of carbon dioxide produced at 0 minutes, 10 minutes, 20 minutes, and 30 minutes was recorded. Part Two: All of the ingredients were added to the bread machine. The Basic Cycle was selected, as was the Light Crust option. When the baking cycle ended, the bread was allowed to cool to room temperature before slicing. The height of the bread, the shape, and the amount of air bubbles were observed.

Data

Conclusion

Thanks