What is the primary advantage of bacterial batch culture?
Batch culture is closed cultivation system where microorganisms are inoculated once into finite volume containing all necessary nutrients and incubated without further medium addition or removal until growth ceases due to depletion. Simplicity reduces contamination risk from feed lines, pumps and effluent handling and allows precise temporal monitoring of lag, log, stationary and death phases via periodic optical density and viable counts for kinetic analysis. Environmental parameters such as temperature via incubator control, pH via buffers or automatic titration, aeration via shaking or sparging and initial substrate concentration can be tightly controlled and reproduced across replicates. Unlike continuous chemostat that maintains cells perpetually in exponential phase at fixed dilution rate eliminating stationary phase, or fed-batch extending growth via incremental feeding, batch inevitably progresses through complete growth cycle culminating in exhaustion of nutrients and accumulation of organic acids like acetate. Low cost and reproducible growth profiles make batch primary method for strain screening, minimum inhibitory concentration assays, teaching laboratories and quality control, not for indefinite nutrient supply or continuous removal of toxic metabolites which require open systems with inflow and outflow balances.
Ref: Madigan et al., Brock Biology of Microorganisms, 16th ed., Chapter 4: Batch Culture and Controlled Environmental Conditions.