Igor Andreev Jul 13, 2020:

Натали, католит и cathodic spacer по приведенной Вами же ссылке - разные вещи:
A special electrolyte solution has to be added to the sample, which is able to block electrophoretically the capillary segment between the catholyte and the detector. As a result, proteins will not be focused behind the detector. To avoid loss of acidic carrier ampholytes, a similar electrophoretic lock is required on the anodic side. As a consequence of addition of these electrolytes, the pH gradient is compressed because only a reduced capillary length is available for the formation of the pH gradient. This may lead to a reduction in resolution14. These electrolytes are called spacers and are added to the sample prior to a run.

М.б. это можно назвать раствор-разделитель? Русского перевода пока не нашел