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A batch-to-batch variability results from the variation of process parameters inherent to a manufacturing process that is defined by a series of parameters (e.g. starting materials, solvents, temperature, order of manufacturing steps, etc.).
If the variation in a parameter is only due to batch-to-batch variability, then these are still considered as being the same nanoform. However, if there are deliberate changes to the process parameters, then these are different nanoforms.