character: Dr. Johnson
topic: Biochemical Properties of Natural Preservatives
grade: 11
subject: Chemistry
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character: Ms. Adams
topic: Chemical Reactions of Food Preservatives
grade: 11
subject: Chemistry
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character: Mr. Smith
topic: The Role of Antioxidants in Food Preservation
grade: 11
subject: Chemistry
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character: Dr. Lee
topic: Natural vs. Synthetic Preservatives: A Comparative Study
grade: 11
subject: Chemistry
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