Abstract
The paper presents optimum conditions for separation and determination of three dimethyl derivatives of ES-silanates by capillary isotachophoresis. The following were considered in the study: 1-[(N,N-dimethyl)aminiomethyl]-spirobi(1-sila-2,5-dioxacyclopentan-3-on)at, 1-[(N,N-dimethyl)aminiomethyl]-spirobi(1-sila-2,5-dioxa-4-methylcyclopentan-3-on)at, and 1-[(N,N-dimethyl)aminiomethyl]-spirobi(1-sila-2,5-dioxa-4,4-dimethylcyclopentan-3-on)at. An aqueous solution of 4,4'-bis{1-[(N,N-dimethyl)aminiomethyl]spirobi(1-sila-2,5-dioxacyclopentan-3-on)at} was proposed as a terminating electrolyte in the determination process. The optimum time of analysis did not exceed 7 min. The limit of identification of ES-silanates was 2.0 µg · L−1 and the limit of quantification was 6.6 µg · L−1. The newly developed method allows for a more extensive research on the biological activity of hypercoordinated compounds belonging to ES-silanates and increases their applicability (e.g., as terminating electrolytes).
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