Fluorimetric quantitation of citalopram and escitalopram in plasma: developing an express method to monitor compliance in clinical trials.

Abstract:

BACKGROUND:Selective serotonin reuptake inhibitors (SSRIs) in general, and citalopram/escitalopram in particular, are widely used to treat clinical depression. However, SSRI bioavailability and non-compliance represent major issues, especially in the clinical trials setting. In this context, frequent drug-level measurements for compliance monitoring would be a desirable tool to improve clinical outcomes with SSRIs. However, the liquid chromatography techniques available are expensive, requiring excessive sample preparation, and suffer from high complexity. We sought to develop a rapid method for the measurement of citalopram/escitalopram levels in human plasma by fluorimetry. METHODS:A total of 34 frozen human plasma samples were thawed at room temperature and repeatedly centrifuged in cellulose to remove aggregates, proteins and solids. Fluorescence spectra were measured in the range 270-450 nm with excitation at 240 nm on a FluoroMax 3 spectrofluorimeter. Control samples contained known concentrations of SSRIs. RESULTS:SSRI absorbance spectra were recorded in the range 230-320 nm. The shape of the spectra and the absorbance of citalopram and escitalopram were very similar, with UV maximum absorbance at 239 nm. The maximum extinction coefficient was epsilon239=15,930 M-1 cm-1 for citalopram and epsilon239=13,630 M-1 cm-1 for escitalopram. The fluorescence spectra of SSRIs are unique and are characterized by the presence of two well-defined conjugated spectra with maxima at 300 and 382 nm. CONCLUSIONS:Fluorimetry is very suitable for assessment of plasma SSRI levels. This inexpensive and efficient technique can objectively and reliably quantify drug levels in biological fluids, thereby directly determining the level of patient adherence to the prescribed drug regimen. This method will be useful in a broad spectrum of applications, from compliance/bioavailability assessments in animal and human experiments to utilization in large-scale clinical trials.

journal_name

Clin Chem Lab Med

authors

Serebruany V,Malinin A,Dragan V,Atar D,van Zyl L,Dragan A,Lexapro Compliance Task Force.

doi

10.1515/CCLM.2007.108

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

513-20

issue

4

eissn

1434-6621

issn

1437-4331

journal_volume

45

pub_type

杂志文章
  • Non-coding RNAs: the cancer genome dark matter that matters!

    abstract::Protein-coding genes comprise only 3% of the human genome, while the genes that are transcribed into RNAs but do not code for proteins occupy majority of the genome. Once considered as biological darker matter, non-coding RNAs are now being recognized as critical regulators in cancer genome. Among the many types of no...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章,评审

    doi:10.1515/cclm-2016-0740

    authors: Ling H,Girnita L,Buda O,Calin GA

    更新日期:2017-05-01 00:00:00

  • Discrepancies between apolipoprotein E phenotyping and genotyping in the elderly.

    abstract::We estimated the frequencies of phenotype (isoelectric focusing; IEF) vs. genotype (PCR/Hhal) discordance in a sample of an aged population (> 65 years). Both phenotype and genotype techniques have been used in the study of apolipoprotein E (apoE) polymorphism in 125 elderly subjects. The discordance between phenotype...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2001.065

    authors: Dupuy AM,Badiou S,Ritchie K,Mas E,Descomps B,Cristol JP,Touchon J

    更新日期:2001-05-01 00:00:00

  • A standardised FACS assay based on native, receptor transfected cells for the clinical diagnosis and monitoring of β1-adrenergic receptor autoantibodies in human heart disease.

    abstract:BACKGROUND:Autoantibodies against β1-adrenergic receptors (β1AR) that stimulate cardiac cAMP-production play a causal role in the pathogenesis of human heart failure. Patients can be subjected to specific therapies, if the presence of potentially cardio-noxious β1AR-autoantibodies is reliably diagnosed. This requires a...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2015-0603

    authors: Bornholz B,Benninghaus T,Reinke Y,Felix SB,Roggenbuck D,Jahns-Boivin V,Jahns R,Boege F

    更新日期:2016-04-01 00:00:00

  • Evaluation of serum levels of p53 in hepatocellular carcinoma in Egypt.

    abstract::Hepatocellular carcinoma (HCC) is one of the most common causes of cancer-induced death. Somatic mutation of the p53 gene is the most common genetic abnormality so far described in human cancer and there is evidence that supports a high level of p53 alterations in HCC. The aim of this study was to investigate serum le...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2006.091

    authors: El Far MA,Atwa MA,Yahya RS,El Basuni MA

    更新日期:2006-01-01 00:00:00

  • Comparison of Freelite™ and N Latex serum free light chain assays in subjects with end stage kidney disease on haemodialysis.

    abstract:BACKGROUND:Quantification of serum free light chains (FLC) is important in the diagnosis of plasma cell diseases where an abnormal kappa:lambda ratio infers a population of monoclonal plasma cells. The Freelite™ and N Latex assays have been validated in populations without kidney disease but there is a paucity of data ...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2015-0799

    authors: Kennard A,Hawley C,Tate J,Klingberg S,Pretorius C,Hutchison C,Mollee P

    更新日期:2016-06-01 00:00:00

  • Cytokines as plasma markers of abdominal aortic aneurysm.

    abstract:UNLABELLED:The pathogenesis of abdominal aortic aneurysms (AAA) is a complex process in which atherosclerosis and inflammation play a leading role. Cytokines are important mediators of both processes. The aim of our study was to determine whether plasma levels of cytokines which are most involved in AAA pathogenesis ca...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2000.178

    authors: Treska V,Topolcan O,Pecen L

    更新日期:2000-11-01 00:00:00

  • Laboratory testing in pharmacies.

    abstract::Point-of-care testing (POCT) is traditionally defined as laboratory diagnostics performed at or near the site where clinical care is delivered. POCT thereby combines sample collection, analysis, and reporting of results into a robust integrated testing structure, with a simple user interface. The availability of relia...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章,评审

    doi:10.1515/CCLM.2010.184

    authors: Lippi G,Plebani M,Favaloro EJ,Trenti T

    更新日期:2010-07-01 00:00:00

  • Holotranscobalamin as a predictor of vitamin B12 status.

    abstract::We report on the performance of a new test, holotranscobalamin, as compared to well established markers of vitamin B12 deficiency (plasma cobalamins, methylmalonic acid, and homocysteine). Holotranscobalamin was analyzed in 143 samples by a competitive radiobinding assay (Axis-Shield). Employing a cut-off value of 50 ...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2003.228

    authors: Hvas AM,Nexo E

    更新日期:2003-11-01 00:00:00

  • Phospholipases A2 in gastric juice of Helicobacter pylori--positive and negative individuals.

    abstract::Gastric juice is known to have phospholipase A2 catalytic activity. Helicobacter pylori (H. pylori) has been reported to produce phospholipase A2, which is believed to hydrolyse the protective layer of gastric mucosal phospholipids and to promote mucosal damage. The current study aimed at identifying secretory phospho...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 临床试验,杂志文章

    doi:10.1515/CCLM.1999.009

    authors: Huhtinen HT,Grönroos JM,Haapamäki MM,Nevalainen TJ

    更新日期:1999-01-01 00:00:00

  • A candidate reference method using ICP-MS for sweat chloride quantification.

    abstract:BACKGROUND:The aim of the study was to develop a method for sweat chloride (Cl) quantification using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to present to the Joint Committee for Traceability in Laboratory Medicine (JCTLM) as a candidate reference method for the diagnosis of cystic fibrosis (CF). METHODS...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2015-0506

    authors: Collie JT,Massie RJ,Jones OA,Morrison PD,Greaves RF

    更新日期:2016-04-01 00:00:00

  • Genotyping mitochondrial DNA single nucleotide polymorphisms by PCR ligase detection reactions.

    abstract:BACKGROUND:The identification of human mitochondrial DNA (mtDNA) sequence variations, especially single nucleotide polymorphisms (SNPs), is important for many applications. The PCR-ligase detection reaction (LDR) method can reduce false-positives and eliminate the need for both post-PCR and post-ligation purifications ...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2010.097

    authors: Luo Y,Tang S,Gao W,Chen L,Yang X,Huang T,Gao Y

    更新日期:2010-04-01 00:00:00

  • Maillard reaction products: some considerations on their health effects.

    abstract::For several decades, researchers have been investigating the relations between the consumption of Maillard reaction products (MRPs) and biological activities, whether harmful or beneficial. Interest in this area is growing because the intake of these compounds has increased in parallel with the consumption of thermall...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章,评审

    doi:10.1515/cclm-2012-0823

    authors: Delgado-Andrade C

    更新日期:2014-01-01 00:00:00

  • Assessment of the clinical utility of adding common single nucleotide polymorphism genetic scores to classical risk factor algorithms in coronary heart disease risk prediction in UK men.

    abstract:BACKGROUND:Risk prediction algorithms for coronary heart disease (CHD) are recommended for clinical use. However, their predictive ability remains modest and the inclusion of genetic risk may improve their performance. METHODS:QRISK2 was used to assess CHD risk using conventional risk factors (CRFs). The performance o...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2016-0984

    authors: Beaney KE,Cooper JA,Drenos F,Humphries SE

    更新日期:2017-08-28 00:00:00

  • Mining of hospital laboratory information systems: a model study defining age- and gender-specific reference intervals and trajectories for plasma creatinine in a pediatric population.

    abstract:BACKGROUND:The knowledge of physiological fluctuation and variation of even commonly used biochemical quantities in extreme age groups and during development is sparse. This challenges the clinical interpretation and utility of laboratory tests in these age groups. To explore the utility of hospital laboratory data as ...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2014-0949

    authors: Søeby K,Jensen PB,Werge T,Sørensen S

    更新日期:2015-09-01 00:00:00

  • Performance characteristics of a microfluidic Lab-on-Chip electrophoresis system for high-density lipoprotein (HDL) subfraction separation and measurement.

    abstract:BACKGROUND:High-density lipoprotein (HDL) is believed to be protective against coronary heart disease (CHD). HDL is comprised of different subfractions. Of these, HDL 2b is believed to be the most important in preventing CHD. Current methods for HDL subfraction measurements are not standardized and often exhibit poor a...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2010.133

    authors: Yang DH,Konigshofer Y,Dike J,Chang E,Mueller O

    更新日期:2010-06-01 00:00:00

  • Age-related changes in serum amino acids concentrations in healthy individuals.

    abstract:BACKGROUND:Serum amino acids, part of a pool of free amino acids, are influenced by metabolism and disease. Few reports exist describing their function and concentrations in serum. Our study aimed to determine age- and gender-related differences in serum amino acid concentrations in healthy Japanese patients, focusing ...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2011-0846

    authors: Kouchiwa T,Wada K,Uchiyama M,Kasezawa N,Niisato M,Murakami H,Fukuyama K,Yokogoshi H

    更新日期:2012-01-04 00:00:00

  • Soluble guanylyl cyclase: physiological role as an NO receptor and the potential molecular target for therapeutic application.

    abstract::Nitric oxide (NO) activates soluble guanylyl cyclase, which results in an increased synthesis of cyclic guanosine 3',5'-cyclic monophosphate (cGMP), smooth muscle relaxation and vasodilation. The heme group in soluble guanylyl cyclase binds NO and allosterically activates the catalytic site. In addition, a second allo...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章,评审

    doi:10.1515/CCLM.2003.131

    authors: Nakane M

    更新日期:2003-07-01 00:00:00

  • The soluble transferrin receptor (sTfR)-ferritin index is a potential predictor of celiac disease in children with refractory iron deficiency anemia.

    abstract::The soluble transferrin receptor (sTfR) distinguishes iron deficiency anemia from other types of anemia. Refractory iron deficiency anemia is often the onset symptom in malabsorption-induced celiac disease. We evaluated whether sTfR levels distinguish celiac disease-associated iron deficiency anemia from iron deficien...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2005.005

    authors: De Caterina M,Grimaldi E,Di Pascale G,Salerno G,Rosiello A,Passaretti M,Scopacasa F

    更新日期:2005-01-01 00:00:00

  • Development of a new biochip array for APOE4 classification from plasma samples using immunoassay-based methods.

    abstract:BACKGROUND:Apolipoprotein E (APOE) is a key player in lipid transport and metabolism and exists in three common isoforms: APOE2, APOE3 and APOE4. The presence of the E4 allelic variant is recognized as a major genetic risk factor for dementia and other chronic (neuro)degenerative diseases. The availability of a validat...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2017-0618

    authors: Badrnya S,Doherty T,Richardson C,McConnell RI,Lamont JV,Veitinger M,FitzGerald SP,Zellner M,Umlauf E

    更新日期:2018-04-25 00:00:00

  • Testosterone is an independent determinant of bone mineral density in men with type 2 diabetes mellitus.

    abstract:BACKGROUND:Although many reports have elucidated pathophysiological characteristics of abnormal bone metabolism in patients with type 2 diabetes mellitus (DT2), determinants of bone mineral density (BMD) in patients with DT2 are still controversial. METHODS:We examined 168 Belarussian men 45-60 years of age. Plasma to...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2011.016

    authors: Vasilkova O,Mokhort T,Sanec I,Sharshakova T,Hayashida N,Takamura N

    更新日期:2011-01-01 00:00:00

  • Risk analysis of the preanalytical process based on quality indicators data.

    abstract:BACKGROUND:Improving quality and patient safety in the medical biochemistry laboratory accredited according to the International Standard Organization (ISO 15189:2012) requires the patient-centered evaluation of errors based on the implementation of quality indicators (QIs) across the total testing process. Our main go...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm-2016-0235

    authors: Flegar-Meštrić Z,Perkov S,Radeljak A,Kardum Paro MM,Prkačin I,Devčić-Jeras A

    更新日期:2017-03-01 00:00:00

  • Betaine: a key modulator of one-carbon metabolism and homocysteine status.

    abstract::Betaine serves as a methyl donor in a reaction converting homocysteine to methionine, catalysed by the enzyme betaine-homocysteine methyltransferase. It has been used for years to lower the concentration of plasma total homocysteine (tHcy) in patients with homocystinuria, and has recently been shown to reduce fasting ...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章,评审

    doi:10.1515/CCLM.2005.187

    authors: Ueland PM,Holm PI,Hustad S

    更新日期:2005-01-01 00:00:00

  • A two-step method for the extraction of high-quality RNA from endoscopic biopsies.

    abstract::The use of molecular techniques such as quantitative RT-PCR depends on the quality of cellular RNA. In particular, RNA extraction from endoscopic biopsies is difficult with respect to yield, and especially integrity. Endoscopic biopsies taken from the gastric antrum, corpus and duodenum were subjected to various RNA e...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2003.159

    authors: Wex T,Treiber G,Lendeckel U,Malfertheiner P

    更新日期:2003-08-01 00:00:00

  • Experience with post-market surveillance of in-vitro diagnostic medical devices for lay use in Germany.

    abstract:BACKGROUND:The European Directive 98/79/EC on in-vitro diagnostic medical devices (IVDs) regulates IVD marketing practices and post-market surveillance. IVD manufacturers have to inform the responsible Competent Authorities of any issues. In Germany, the Federal Institute for Drugs and Medical Devices (BfArM) is respon...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2007.058

    authors: Siekmeier R,Lütz J

    更新日期:2007-01-01 00:00:00

  • Isoenzymes of N-acetyl-beta-hexosaminidase in human pleomorphic adenoma and healthy salivary glands: a preliminary study.

    abstract:BACKGROUND:Pleomorphic adenoma (PA) is a benign tumour of the salivary gland with a tendency to malignancy which creates many diagnostic problems. N-acetyl-beta-hexosaminidase (HEX) is a lysosomal exoglycosidase involved in degradation of oligosaccharide chains of glycoproteins, glycolipids and glycosaminoglycans, know...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2008.018

    authors: Borzym-Kluczyk M,Olszewska E,Radziejewska I,Lewszuk A,Zwierz K

    更新日期:2008-01-01 00:00:00

  • Serum levels of matrix metalloproteinase-2 and -9 and conventional tumor markers (CEA and CA 19-9) in patients with colorectal and gastric cancers.

    abstract:BACKGROUND:Matrix metalloproteinases (MMPs), especially MMP-2 and MMP-9, play an important role in tumor invasion and metastasis. This study aimed to determine the serum levels of MMP-2, MMP-9, 130- and 225-kDa gelatinolytic bands and conventional tumor markers, carcinoembryonic antigen (CEA) and cancer antigen (CA) 19...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2009.212

    authors: Emara M,Cheung PY,Grabowski K,Sawicki G,Wozniak M

    更新日期:2009-01-01 00:00:00

  • Serum lactate dehydrogenase levels significantly correlate with radiological extent of disease and spirometric values in patients with silicosis due to denim sandblasting.

    abstract:BACKGROUND:The aim of the present study was to investigate serum lactate dehydrogenase (LD) levels in patients with silicosis due to denim sandblasting (SDDS) and also to investigate possible correlations between serum LD levels and the degree of radiological extent of disease (RED) and pulmonary function tests. METHO...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/cclm.2011.795

    authors: Deniz O,Gumus S,Ors F,Yaman H,Battal B,Karaman B,Acikel CH,Ucar E,Cakir E,Tozkoparan E,Bilgic H

    更新日期:2012-01-31 00:00:00

  • From "clinical proteomics" to "clinical chemistry proteomics": considerations using quantitative mass-spectrometry as a model approach.

    abstract::Clinical Proteomics biomarker discovery programs lead to the selection of putative new biomarkers of human pathologies. Following an initial discovery phase, validation of these candidates in larger populations is a major task that recently started relying upon the use of mass spectrometry approaches, especially in ca...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章,评审

    doi:10.1515/CCLM.2011.744

    authors: Lehmann S,Poinot P,Tiers L,Junot C,Becher F,Hirtz C

    更新日期:2011-10-08 00:00:00

  • Comparison of two reverse transcription-polymerase chain reaction methods for detection of AML1/ETO rearrangement in the M2 subtype of acute myeloid leukaemia.

    abstract::Two reverse transcription-polymerase chain reaction methods to detect the AML1/ETO rearrangement in the M2 subtype of acute myeloid leukaemia those of Downing et al. (Blood 1993; 81: 2860-5) and Satake et al. (Br J Haematol 1995; 91: 892-8) were evaluated. Bone marrow samples, one at diagnosis and two in complete remi...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.1998.026

    authors: Barragán E,Bonanad S,López JA,Bolufer P,Sanz MA

    更新日期:1998-03-01 00:00:00

  • Significance of small dense low-density lipoproteins as coronary risk factor in diabetic and non-diabetic Korean populations.

    abstract::Small dense low-density lipoproteins (LDLs) have been associated with coronary heart disease (CHD) and type 2 diabetes in previous studies. However, the significance of small dense LDLs as a coronary risk factor for subjects with type 2 diabetes remains unclear. We measured mean LDL particle diameter by gradient gel e...

    journal_title:Clinical chemistry and laboratory medicine

    pub_type: 杂志文章

    doi:10.1515/CCLM.2005.076

    authors: Yoon Y,Song J,Park HD,Park KU,Kim JQ

    更新日期:2005-01-01 00:00:00