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Effect of Preservatives on Yeast

CSEF · 2016 Microbiology (General)

Amaya M. Bechler · Jacoby Creek Elementary School, Bayside, Humboldt County

Overview

Objectives/Goals The objective of this project was to determine the effect of specific preservatives on the growth of yeast (Saccharomyces cerevisiae.) Methods/Materials To set up the experiment the materials used were dry baker's yeast, petri dishes, a base for cultures and a variety of preservatives. Weight of cultures was recorded for several days as a measure of growth. Results The results show that some preservatives benefit the growth of yeast while others inhibit it. Conclusions/Discussion The results were partially in line with my hypothesis. The experiment showed that some preservatives have a positive effect on yeast whilst some have a negative effect. The project is of importance because it shows the effect of certain chemicals on eukaryotic cells, these being cells in human bodies along with other animals. Since humans often consume the preservatives, we should know of the effect on our cells.

Summary statement

Some preservatives benefit yeast growth while some inhibit its growth.

Help received

My science teacher, Diana Skiles, helped me with writing my conclusion coherently. Otherwise, I completed the experiment by myself.

Competition history

  • CSEF 2016 Microbiology (General) · Entry J1502

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