character: Professor Smith
topic: Applications of Food Additives in Preservation
grade: 11
subject: Chemistry
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character: Dr. Johnson
topic: Chemical Processes in Food Preservation
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: Natural vs Synthetic Food Preservatives
grade: 11
subject: Chemistry
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character: Mr. Patel
topic: Role of Antioxidants in Extending Shelf Life
grade: 11
subject: Chemistry
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