Title page for ETD etd-06252003-133915


Type of Document Master's Thesis
Author Hartman, Angela Danielle
URN etd-06252003-133915
Title The Efficacy of Antimicrobials for the Control of Alicyclobacillus acidoterrestris in Fruit and Vegetable Juices
Degree Master of Science
Department Food Science and Technology
Advisory Committee
Advisor Name Title
Williams, Robert C. Committee Chair
Sumner, Susan S. Committee Member
Zoecklein, Bruce W. Committee Member
Keywords
  • juices
  • Alicyclobacillus acidoterrestris
  • antimicrobials
Date of Defense 2003-06-12
Availability unrestricted
Abstract
The efficacy of antimicrobials for control of A. acidoterrestris spoilage in juices was analyzed. Apple and tomato juices were inoculated with 4 log spores/ml. Antimicrobials were added at: 1000, 500 and 250 ppm (sodium benzoate, potassium sorbate, and sodium metabisulfite); 500, 250, and 125 ppm (cinnamic acid, dimethyl dicarbonate, and ascorbic acid); 125, 75 and 25 ppm (lysozyme); and 5, 3, and 1 IU/ml (nisin).

In apple juice, A. acidoterrestris population reductions were caused by the following antimicrobials (reduction in log CFU/ml): lysozyme - all levels and nisin - 5 IU/ml (5.1), nisin - 3 IU/ml (4.2), cinnamic acid - 125 ppm (3.1), cinnamic acid - 250 ppm (2.6), potassium sorbate - 250ppm (2.5), nisin - 1 IU/ml (2.4), potassium sorbate - 500 and 1,000 ppm (2.3), dimethyl dicarbonate - 500 ppm (1.9), cinnamic acid - 500 ppm (1.4). In tomato juice, A. acidoterrestris population reductions were caused by the following antimicrobials (reduction log CFU/ml): nisin - all levels and lysozyme - 125 ppm and 75 ppm (4.4), lysozyme - 25 ppm (3.8), potassium sorbate - 500 ppm (2.6), cinnamic acid - 500 ppm (2.5), cinnamic acid - 250 ppm (2.4), cinnamic acid - 125 ppm (2.1), potassium sorbate - 1,000 ppm (1.9), and potassium sorbate - 250 ppm (1.6).

Antimicrobial treatments: nisin - ¡Ý 1 IU/ml, lysozyme - ¡Ý 25 ppm, cinnamic acid - ¡Ý 125 ppm, and potassium sorbate - ¡Ý 250 ppm may be appropriate controls to prevent A. acidoterrestris spoilage in juices or juice containing beverages.

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