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Application Notes

Water activity measurement (ERH%) in food & bakery products
Water activity measurement ( ERH %)  in food and bakery products is a useful tool for determining shelf-life by understanding  microbial growth potential moisture migration and stability of ingredients or finished  products. This applies especially to long shelf-life food products like cakes, breads, muffins, pastries as well as ingredients including  biscuit, creams, fondants, custards and fruit fillings . It is important to use  a water activity meter that is capable of sample temperature control and one with resilience to the effects of non aqueous volatiles including : sorbitol, glycerol, acetic and citric acids, all commonly used as preservatives in baking.

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Water activity measurement  (ERH %) in toothpaste products
Modern toothpaste manufacture is heading towards the use of solvent based silica products rather than traditional water based calcium. This new technology results in the need for quality control procedures that employ water activity ( ERH %) as an essential tool to maintain stability and prolong shelf life of the product. The main challenge in testing  for water activity  is the presence of glycerine  in these modern toothpastes for which a specialised sample temperature controlled  water activity meter needs to be used to ensure reliable and consistent readings, working to an established Standard Operating Procedure ( SOP) which needs to be produced with guidance from the water activity meter manufacturer.

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Water activity measurement (ERH%) in antibiotics and film coated pharmaceutical tablets
Water activity measurement in film coated tables for pharmaceutical manufacture, and antibiotics in particular provides helpful information about the long term stability of the finished product or it’s component parts. Quality control procedures that are FDA regulated often include water activity ( ERH % ) as an essential  QA parameter. Sample temperature control, resilience to non aqueous volatiles and the dust from powder based samples is essential for reliable sample testing. A Standard Operating Procedure (SOP) that can be validated within your quality system, and produced with guidance from the water activity meter manufacturer, can increase consistency of readings and lead to better quality of measurements, especially for multinational manufacturers of pharmaceuticals.

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Water activity measurement (ERH%) in oil & gas drilling industry products
Water activity measurement (ERH %) is becoming widely used in the oil and gas industry now that the benefits of moisture migration within drilling muds and brines are being better understood and better controlled. Both  drilling muds and brines for the drilling industry can be of  improved quality and performance by controlling water activity during research and development as well as during manufacture and use. Measuring water activity in drilling muds and brines can be a challenge. However due to the nature of the environment of use, as well as volatiles in the products, a robust meter with sample temperature control and a special sensor and filtering system should be employed so that a true representation of water activity can be achieved and long term reliability.

Please click here for the full article on application notes water activity in oil and gas industries.