Nominal Value
The assumed activity of an endotoxin preparation, dilution, or "spike"; based on label-claim information.(TR82)
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Naturally Occurring Endotoxin (NOE)
Endotoxin prepared from Gram-negative bacteria produced under defined conditions and with minimal nonchemical processing, e.g., centrifugation and filtration.(TR82)
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Measured Values
Those values where activity is confirmed by interpolation from a reference standard curve.(TR82)
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Masking
A type of interference that may result in low endotoxin recovery.(TR82)
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Low Endotoxin Recovery (LER)
The inability to recover ≥50% activity over time when known amount of endotoxin is added to an undiluted product. LER cannot be overcome by dilution.(TR82)
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Reference Standard Endotoxin (RSE)
The primary standard from USP, EDQM, JP and WHO for use in the harmonized compendial bacterial endotoxins test (BET). The current 3rd International Standard (WHO), USP, and EDQM RS are lyophilized formulation that contains highly purified LPS that is chemically extracted and purified from E. coli strain O113:H10:K(-) and further formulated with stabilizers and excipients.(TR82)
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Control Standard Endotoxin (CSE)
Endotoxin preparations other than the international or national reference standards that are traceable in their calibration to the international endotoxin reference standard. A CSE is a secondary or tertiary standard, commonly purified from Escherichia coli, and is usually manufactured and certified by an LAL reagent manufacturer for use with a specific lot of reagent under defined assay conditions.(TR82)
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Activity
Ability of endotoxin (LPS) to initiate the LAL cascade in the compendial bacterial endotoxins test (BET) assay, or the ability to elicit a pyrogenic response in a compendial pyrogen test (2,10). Activity can be measured by other assays such as the monocyte activation test (MAT) or recombinant Factor C tests (rFc), if such tests have been validated, to demonstrate that decisions made from the results are comparable to or superior to the compendial assay. Activity is measured in endotoxin units (EU). In terms of activity, one EU = one IU, regardless of the source. Activity is generally expressed as a concentration, usually EU/mL.(TR82)
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Potency
The measure of the biological activity using a suitably quantitative biological assay, based on the attribute of the product that is linked to the relevant biological properties. (TR57)
An expression of the activity of a secondary calibration standard to relate units of weight (ng/ vial or ng/mL) to units of activity (EU/ng) in a preparation.(TR82)
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Lipopolysaccharide
A component of the cell wall of Gram-negative bacteria.(TR3)
Component of the outer cell wall of Gram-negative bacteria that is pyrogenic. (TR69)(TR82)
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