What is the meaning of European Pharmacopoeia descriptions equal, less, greater, between and next of a LICO instrument?

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Dokument-ID TE12647

Veröffentlichungsdatum

Veröffentlichungsdatum 22.12.2021
Frage
What is the meaning of European Pharmacopoeia descriptions equal, less, greater, between and next of a LICO instrument?
Zusammenfassung
meaning of European Pharmacopoeia descriptions equal, less, greater, between and next of a LICO instrument
Antwort
On the Lico instrument specified scale has to be selected for measuring Ph.Eur. system:


A scale is specified (e.g. B). The identifier of the reference solution whose colour is closest to that of the sample within the specified scale (i.e. the reference solution with the smallest colour difference DE* to the sample within the specified scale) is displayed.
If a scale is specified (e.g. scale B), one of the following five signs is used to define the correlation between the measurement results and the scale more precisely:

= equal: The colour of the sample is equal to the color of the reference solution. A sample is considered as "equal (=)" or “the same as” if the colour difference DE* to the nearest three-dimensional CRS is less than the given " DE* equal" - limit of this CRS (see nominal values of the CRS, page 13).

< less: The colour number of the sample is less than that of the reference solution

> greater: The colour number of the sample is greater than that of the reference solution

<> between: The colour number of the sample lies between those of two reference solutions

-> next: The sample colour lies outside the tolerance ranges of the selected colour scale. In this case, the system gives the Ph.Eur.-solution whose colorimetric values are the closest to that of the measured sample. For instance, "-> B5" means that the location of the sample colour is outside scale B, but reference solution B5 is the one with the smallest colour distance DE* to the sample.

The limits of the descriptive terms "equal, less etc." is stipulated for each colour reference solution
(CRS). These limits are three-dimensional spheres around each CRS. For better understanding, fig.
5 shows these limits as two-dimensional ellipses, although not true to scale.


A sample is considered as "equal (=)" or “the same as” if the colour difference DE* to the nearest three-dimensional CRS is less than the given " DE* equal"-limit of this CRS (see nominal values of the CRS, p. 13). For a colour difference greater than " DE* equal" but less than the first " DE*"-limit the sample is assessed with greater (higher hue value) or less (smaller hue value).
 

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