In one line: a stability chamber holds a fixed temperature and relative humidity by running conditioned air in a continuous loop past a heater, a refrigeration coil and a humidifier, with a PLC trimming each one against sensors mounted in…
Answer first Three pharmacopoeias describe the same measurement and they are not interchangeable. USP General Chapter <791> pH, Ph. Eur. 2.2.3 and IP 2.4.24 do not appear on either of the Pharmacopoeial Discussion Group harmonisation tables that USP publishes, so a…
Direct answer Sterilization kills organisms. Depyrogenation destroys or removes the endotoxin those organisms leave behind. A dead Gram-negative cell still carries the lipopolysaccharide that causes a pyrogenic response, so a container can be sterile and still fail a parenteral release…
In one paragraph Gas chromatography separates a mixture by repeatedly partitioning volatile components between an inert carrier gas (the mobile phase) and a liquid or solid film coated inside a capillary column (the stationary phase). Components that spend more time…
Short answer An SOP for fumigation of microbiology lab is only defensible if the cycle is validated and if re-entry is decided by a measured fumigant concentration — never by smell or by elapsed time. Fumigation is whole-room bio-decontamination, not…
The short answer Calibrating a volumetric Karl Fischer titrator means determining the water equivalence factor (F) of the titrant — how many milligrams of water one millilitre of reagent consumes. Sodium tartrate dihydrate is the standard of choice because it…
Short answer HPLC separates the components of a mixture by pumping the sample, dissolved in a liquid mobile phase, through a column packed with a solid stationary phase under high pressure. Each component partitions between the two phases to a…
Technical reference · Reviewed and updated 27 August 2026 · Dimensions and operating limits quoted from USP General Chapter 801 The short answer A dropping mercury electrode (DME) is a mercury electrode formed by a sequence of mercury drops falling…
Liquid filling machine validation parameters are one of the most critical activities in pharmaceutical manufacturing because it directly determines the correct dose, sterility (for injectables), and consistency of every unit released to patients. Inadequate validation of liquid filling machine parameters…
Short answer. Under Ph. Eur. 2.9.5 a powder for parenteral administration with an average mass above 40 mg is tested by weighing 20 containers: not more than 2 may deviate from the average by more than 10%, and none by more…