Hi Yes, the work of the department is divided into the various areas of study that you list there "Chemistry" means the very detailed analysis of what is in the food. That might include investigation of the molecular structure of what is in the food: antioxidants, emulsifiers, stabilisers, thickeners, sweeteners, and so on I'm no expert, but here's an example of an antioxidant, as a chemist might see it. Dave Metabolite Glutathione, Wikipedia, public domain
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