Analysis

Which are the needed analytical activities in the cosmetic field? Firstly, they should always be applied to raw materials employed in manufacturing; however, for many different reasons of economics or production rhythms nature, the raw materials analytical control is often reduced to the comparison between the batch analysis certificate and the technical sheet and to a brief evaluation of simple characteristics (aspect, colour, odour, identity). Even if these properties are relevant, they often have a secondary importance. A selection of suppliers following restrictive criteria is very helpful to reduce internal controls. A rational classification system applied to raw materials could be based on the microbiological contamination or identified chemical risk. These could be adopted to define priorities in analytical checks. For some raw materials, especially those possessing specific risks and deionised water, it is necessary to adopt frequent methodical checks (usually batch to batch). Furthermore, analytical controls must concern finished products, both to define the conformity to the approved reference and for an appropriate check of stability and compatibility with the packaging material. For some particular cosmetics, the microbial count of all the batches and the challenge-test, that are necessary to confirm the adequacy of the chosen preservative system, should be coupled with the analytical quantification of preservatives. Finally, a particular attention to impurities must be given, since they are often responsible for allergic reactions.