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• W2127907372 startingPage "9369" @default.
• W2127907372 abstract "Early stages of insulin aggregation, which involve the transient formation of oligomeric aggregates, are an important aspect in the progression of Type II diabetes and in the quality control of pharmaceutical insulin production. This study is the first to utilize capillary electrophoresis (CE) with ultraviolet (UV) detection to monitor insulin oligomer formation at pH 8.0 and physiological ionic strength. The lag time to formation of the first detected species in the aggregation process was evaluated by UV-CE and thioflavin T (ThT) binding for salt concentrations from 100 mM to 250 mM. UV-CE had a significantly shorter (5–8 h) lag time than ThT binding (15–19 h). In addition, the lag time to detection of the first aggregated species via UV-CE was unaffected by salt concentration, while a trend toward an increased lag time with increased salt concentration was observed with ThT binding. This result indicates that solution ionic strength impacts early stages of aggregation and β-sheet aggregate formation differently. To observe whether CE may be applied for the analysis of biological samples containing low insulin concentrations, the limit of detection using UV and laser induced fluorescence (LIF) detection modes was determined. The limit of detection using LIF-CE, 48.4 pM, was lower than the physiological insulin concentration, verifying the utility of this technique for monitoring biological samples. LIF-CE was subsequently used to analyze the time course for fluorescein isothiocyanate (FITC)-labeled insulin oligomer formation. This study is the first to report that the FITC label prevented incorporation of insulin into oligomers, cautioning against the use of this fluorescent label as a tag for following early stages of insulin aggregation." @default.
• W2127907372 created "2016-06-24" @default.
• W2127907372 creator A5017444844 @default.
• W2127907372 creator A5036773160 @default.
• W2127907372 creator A5055258964 @default.
• W2127907372 creator A5081790190 @default.
• W2127907372 date "2011-12-14" @default.
• W2127907372 modified "2023-10-18" @default.
• W2127907372 title "Monitoring Insulin Aggregation via Capillary Electrophoresis" @default.
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• W2127907372 doi "https://doi.org/10.3390/ijms12129369" @default.
• W2127907372 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3257135" @default.
• W2127907372 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22272138" @default.
• W2127907372 hasPublicationYear "2011" @default.
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