Microbiology doesn't end when the fermentation stops. The final chapters of the text focus on recovery: filtration, centrifugation, cell disruption, and purification. If you want to know how to turn a vat of fermented broth into pure crystalline penicillin, Patel explains the steps perfectly.
Many textbooks stop at the fermentation tank. Patel continues to the end product. The PDF covers filtration, centrifugation, cell disruption (for intracellular products), and crystallization. For students of pharmaceutical microbiology, this section on the recovery of antibiotics and vitamins is invaluable. Industrial Microbiology By A H Patel.pdf
One line from the PDF stays with me (paraphrasing from memory): "The fermenter is not a machine. It is a domesticated ecosystem." Microbiology doesn't end when the fermentation stops
Downstream processing refers to the separation and purification of biosynthetic products from the fermentation broth. Patel emphasizes that DSP often accounts for a major share of total production costs. Many textbooks stop at the fermentation tank