title: Automated sample preparation coupled to sequential injection chromatography: on-line filtration and dilution protocols prior to separation.
abstract: Sequential injection chromatography (SIC) is a valuable tool in analytical chemistry as it can combine the automation capabilities of low pressure continuous flow techniques and the separation power of HPLC into a single instrumental configuration. The present study reports an automated SI setup allowing on-line filtration and dilution of the samples before separation through a short monolithic column. The applicability of the procedure was evaluated by studying the behavior of acyclovir formulations under forced degradation conditions. Minimal sample preparation is required prior to analysis. Thorough validation of the on-line dilution SIC assay was carried out and proved its validity in terms of critical parameters such as precision, accuracy and robustness. The results were evaluated by parallel experiments and analysis using the procedure recommended by the USP based on conventional HPLC using particulate-based column.
authors.affiliation: Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: Constantinos K
authors.initials: CK
authors.lastname: Zacharis
authors.forename: Aspasia
authors.initials: A
authors.lastname: Verdoukas
authors.forename: Paraskevas D
authors.initials: PD
authors.lastname: Tzanavaras
authors.forename: Demetrius G
authors.initials: DG
authors.lastname: Themelis
mesh_terms: D000212:Acyclovir / Q000032:analysis; D000998:Antiviral Agents / Q000032:analysis; D001331:Automation; D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D002853:Chromatography, Liquid / Q000379:methods*; D004355:Drug Stability; D005079:Excipients; D005374:Filtration; D007201:Indicator Dilution Techniques; D007202:Indicators and Reagents; D009862:Online Systems; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000998:Antiviral Agents; D005079:Excipients; D007202:Indicators and Reagents; D000212:Acyclovir