Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jpba.2009.09.028
Title: A sensitive LC/MS/MS bioanalysis assay of orally administered lipoic acid in rat blood and brain tissue
Authors: Chng, H.T.
New, L.S. 
Neo, A.H.
Goh, C.W.
Browne, E.R.
Chan, E.C.Y. 
Keywords: Alzheimer's disease
Diabetes polyneuropathy
Endogenous
LC/MS/MS
Lipoic acid
Issue Date: 5-Feb-2010
Citation: Chng, H.T., New, L.S., Neo, A.H., Goh, C.W., Browne, E.R., Chan, E.C.Y. (2010-02-05). A sensitive LC/MS/MS bioanalysis assay of orally administered lipoic acid in rat blood and brain tissue. Journal of Pharmaceutical and Biomedical Analysis 51 (3) : 754-757. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jpba.2009.09.028
Abstract: A sensitive liquid chromatography tandem mass spectrometry (LC/MS/MS) bioanalytical method was developed and validated to analyze lipoic acid (LA) in rat blood and brain samples. Ten mobile phase combinations were investigated during method development. Mobile phase combination of 0.1% acetic acid (pH 4 adjusted with ammonia solution)/acetonitrile was most optimum in terms of sensitivity and peak shape of LA and the internal standard, valproic acid. Sample extraction method was explored using liquid-liquid extraction and protein precipitation methods. Protein precipitation yielded the highest recovery of the analytes from blood and brain ranging from 92 to 115%. The lower limit of quantitation (LLOQ) of LA was 0.1 ng/mL (0.485 nM) in both blood and brain while on-column lower limit of detection (LLOD) was 0.03 pg. The precision (% R.S.D.) ranged from 1.49 to 26.39% and 1.49 to 10.89% for intra- and inter-day assays, respectively. The accuracy ranged from 91.2 to 116.17% for intra-day assay and 102.68 to 114.33% for inter-day assay. © 2009 Elsevier B.V. All rights reserved.
Source Title: Journal of Pharmaceutical and Biomedical Analysis
URI: http://scholarbank.nus.edu.sg/handle/10635/105592
ISSN: 07317085
DOI: 10.1016/j.jpba.2009.09.028
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