New Alconox Blog



Thursday, March 05, 2009

NEW from Alconox – Calculator for Residue Acceptance Criteria Limits - For Alconox Inc. Detergents

How can the calculator help you? What pieces of information does this calculator require in order to perform calculation?

As part of a cleaning validation, acceptable residue limits for the cleaner being used needs to be determined. This determination is made by calculating a safety based limit and comparing it to a 10 ppm carryover limit. The lower of these two limits calculated is the limit to adopt. In order to calculate the safety based acceptable residue limit, the acceptable daily intake (ADI) of the cleaner needs to be calculated. This requires several pieces of information including identification of the Alconox, Inc cleaner that is intended to be used as well as the typical weight of patients that will be exposed to the pharmaceuticals manufactured on the respective equipment being validated. An appropriate safety factor needs to be selected; usually the default is 1,000 unless it is a particularly hazardous material (1). The resulting ADI can then be used to calculate a safety based acceptance limit for cleaner residue by knowing the batch sizes to be manufactured, the surface area of the shared equipment being cleaned and largest daily patient dose of drug being manufactured. The result is the safety based limit. Next in order to calculate the 10 ppm carryover limit, you use the same batch size and equipment size used in the safety based limit to calculate the 10 ppm limit. The calculator automatically determines and displays the lower of the two limits calculated, either the safety based limit or the 10 ppm carryover limit. This is the residue acceptance criteria limit. The limit of quantitation for the analytical detection method you choose has to be below this limit so that the method is sensitive enough to detect at the residue acceptance limit.

To request the online link for the residue calculator please call technical support at 914-948-4040 ext 151 or email

For product information, visit

No comments: