1
|
Abstract
Antioxidants are compounds that prevent or delay the oxidation process, acting at a much smaller concentration, in comparison to that of the preserved substrate. Primary antioxidants act as scavenging or chain breaking antioxidants, delaying initiation or interrupting propagation step. Secondary antioxidants quench singlet oxygen, decompose peroxides in non-radical species, chelate prooxidative metal ions, inhibit oxidative enzymes. Based on antioxidants’ reactivity, four lines of defense have been described: Preventative antioxidants, radical scavengers, repair antioxidants, and antioxidants relying on adaptation mechanisms. Carbon-based electrodes are largely employed in electroanalysis given their special features, that encompass large surface area, high electroconductivity, chemical stability, nanostructuring possibilities, facility of manufacturing at low cost, and easiness of surface modification. Largely employed methods encompass voltammetry, amperometry, biamperometry and potentiometry. Determination of key endogenous and exogenous individual antioxidants, as well as of antioxidant activity and its main contributors relied on unmodified or modified carbon electrodes, whose analytical parameters are detailed. Recent advances based on modifications with carbon-nanotubes or the use of hybrid nanocomposite materials are described. Large effective surface area, increased mass transport, electrocatalytical effects, improved sensitivity, and low detection limits in the nanomolar range were reported, with applications validated in complex media such as foodstuffs and biological samples.
Collapse
|
2
|
Luconi F, Rochette A, Grad R, Hallé MC, Chin D, Habib B, Thomas A. A multifaceted continuing professional development intervention to move stroke rehabilitation guidelines into professional practice: A feasibility study. Top Stroke Rehabil 2020; 27:401-441. [PMID: 31960782 DOI: 10.1080/10749357.2019.1711339] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
INTRODUCTION Rehabilitation post-stroke is critical for maximizing patient outcomes. This study assessed the feasibility of implementing and evaluating a continuing professional development (CPD) intervention aimed at increasing the uptake of stroke best practice guidelines among physiotherapists (PTs), occupational therapists (OTs) and speech-language pathologists (SLPs) in six university-affiliated stroke rehabilitation centers in Quebec, Canada. METHOD Twelve stroke best practice recommendations with reflective tools were sent weekly by e-mail. Participants' eligibility criteria included: a) profession; b) practicing more than 1 year in a stroke rehabilitation program; c) fluency in French or English; and d) basic computer literacy. Feasibility (operationalized via participation, satisfaction and relevance), cognitive impact, perceived application in practice and expected patient outcomes were measured over 24 weeks using three questionnaires and analyzed using descriptive statistics. RESULTS The sample totaled 62 of 133 eligible (47%) clinicians. Satisfaction, relevance and cognitive impact of delivered information varied across disciplines and recommendations. Agreement with the recommendations was high across disciplines. On average, three-interdisciplinary recommendations (related to post-stoke depression, post-stoke fatigue and patients' and caregivers' learning needs) were rated as the most relevant for at least one patient. The majority of clinicians would use the recommendations for a specific patient and expected health benefits by applying those recommendations. CONCLUSION This study demonstrated the feasibility of assessing the impact of a CPD intervention in stroke rehabilitation uptake and informed the design of a research program aimed at increasing the use of stroke evidence-based rehabilitation interventions.
Collapse
Affiliation(s)
- Francesca Luconi
- Continuing Professional Development (CPD), McGill University , Montreal, Quebec, Canada
| | - Annie Rochette
- CRIR - IUDPM, École de réadaptation, Université de Montréal , Montréal, Québec, Canada
| | - Roland Grad
- Department of Family Medicine, McGill University , Montréal, Québec, Canada
| | - Marie-Christine Hallé
- School of Physical and Occupational Therapy, McGill University , Montréal, Québec, Canada
| | - Diana Chin
- Chef d'administration de programme en réadaptation, CIUSSS Centre-Ouest-de-l'île-de-Montréal , Montréal, Québec, Canada
| | - Bettina Habib
- Continuing Professional Development, McGill University , Montréal, Québec, Canada
| | - Aliki Thomas
- School of Physical and Occupational Therapy, Centre for Medical Education, McGill University , Montréal, Québec, Canada
| |
Collapse
|
3
|
Charoenkitamorn K, Chaiyo S, Chailapakul O, Siangproh W. Low-cost and disposable sensors for the simultaneous determination of coenzyme Q10 and α-lipoic acid using manganese (IV) oxide-modified screen-printed graphene electrodes. Anal Chim Acta 2017; 1004:22-31. [PMID: 29329705 DOI: 10.1016/j.aca.2017.12.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 12/13/2017] [Accepted: 12/15/2017] [Indexed: 10/18/2022]
Abstract
In this work, for the first time, manganese (IV) oxide-modified screen-printed graphene electrodes (MnO2/SPGEs) were developed for the simultaneous electrochemical detection of coenzyme Q10 (CoQ10) and α-lipoic acid (ALA). This sensor exhibits attractive benefits such as simplicity, low production costs, and disposability. Cyclic voltammetry (CV) was used to characterize the electrochemical behavior of the analyte and investigate the capacitance and electroactive surface area of the unmodified and modified electrode surfaces. The electrochemical behavior of CoQ10 and ALA on MnO2/SPGEs was also discussed. Additionally, square wave anodic stripping voltammetry (SWASV) was used for the quantitative determination of CoQ10 and ALA. Under optimal conditions, the obtained signals are linear in the concentration range from 2.0 to 75.0 μg mL-1 for CoQ10 and 0.3-25.0 μg mL-1 for ALA. The low limits of detection (LODs) were found to be 0.56 μg mL-1 and 0.088 μg mL-1 for CoQ10 and ALA, respectively. Moreover, we demonstrated the utility and applicability of the MnO2/SPGE sensor through simultaneous measurements of CoQ10 and ALA in dietary supplements. The sensor provides high accuracy measurements, exhibiting its high potential for practical applications.
Collapse
Affiliation(s)
- Kanokwan Charoenkitamorn
- Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE), Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Patumwan, Bangkok 10330, Thailand
| | - Sudkate Chaiyo
- Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE), Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Patumwan, Bangkok 10330, Thailand
| | - Orawon Chailapakul
- Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE), Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Patumwan, Bangkok 10330, Thailand; Center of Excellent of Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Patumwan, Bangkok 10330, Thailand.
| | - Weena Siangproh
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand.
| |
Collapse
|
4
|
|
5
|
Li D, Deng W, Xu H, Sun Y, Wang Y, Chen S, Ding X. Electrochemical Investigation of Coenzyme Q10 on Silver Electrode in Ethanol Aqueous Solution and Its Determination Using Differential Pulse Voltammetry. ACTA ACUST UNITED AC 2016; 21:579-89. [DOI: 10.1177/2211068216644442] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Indexed: 11/15/2022]
|
6
|
Abstract
In the last few years the importance of Coenzyme Q10 (CoQ10) determination has gained clinical relevance. CoQ10 is a redox-active, lipophilic substance integrated in the mitochondrial respiratory chain which acts as an electron carrier for the production of cellular energy. In addition, it is recognized as a primary regenerating antioxidant playing an intrinsic role against oxidative damage. There are some reports of low CoQ10 levels in a number of disorders, such as cancer, muscular, neurodegenerative, cardiological, and reproductive diseases. Therefore, it is a priority to develop analytical methodologies for evaluating CoQ10 in matrices of greater importance for the correct diagnosis of diseases, simple enough to be used in routine clinical laboratories. In this chapter two recently developed techniques, capillary electrophoresis and microHPLC, for the analysis of CoQ10 in biological matrices, are studied.
Collapse
|
7
|
Ziyatdinova G, Budnikov H. Electroanalysis of antioxidants in pharmaceutical dosage forms: state-of-the-art and perspectives. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-014-1376-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
8
|
An electrochemical glutathione biosensor: Ubiquinone as a transducer. Talanta 2013; 110:15-20. [DOI: 10.1016/j.talanta.2013.03.038] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 03/09/2013] [Accepted: 03/14/2013] [Indexed: 11/20/2022]
|
9
|
Kondo T, Sakai K, Watanabe T, Einaga Y, Yuasa M. Electrochemical detection of lipophilic antioxidants with high sensitivity at boron-doped diamond electrode. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.02.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
10
|
Turkowicz MJ, Karpińska J. Analytical problems with the determination of coenzyme Q10 in biological samples. Biofactors 2013; 39:176-85. [PMID: 23303649 DOI: 10.1002/biof.1058] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 09/13/2012] [Indexed: 11/08/2022]
Abstract
The article discusses analytical problems related to the determination of coenzyme Q10 in biological samples. The assaying of coenzyme Q10 in complex samples, such as plasma, tissues, or food items requires meticulous sample preparation prior to final quantification. The process typically consists of the following steps: deproteinization, extraction, and ultimately reduction of extract volumes. At times drying under a gentle stream of neutral gas is applied. In the case of solid samples, a careful homogenization is also required. Each step of the sample preparation process can be a source of analytical errors that may lead to inaccurate results. The main aim of this work is to point to sources of analytical errors in the preparation process and their relation to physicochemical properties of coenzyme Q10. The article also discusses ways of avoiding and reducing the errors.
Collapse
Affiliation(s)
- Monika Joanna Turkowicz
- Voivodship Sanitary-Epidemiological Station in Bialystok, Food Examination Unit, Białystok, Poland.
| | | |
Collapse
|
11
|
|
12
|
Piepel G, Pasquini B, Cooley S, Heredia-Langner A, Orlandini S, Furlanetto S. Mixture-process variable approach to optimize a microemulsion electrokinetic chromatography method for the quality control of a nutraceutical based on coenzyme Q10. Talanta 2012; 97:73-82. [PMID: 22841049 DOI: 10.1016/j.talanta.2012.03.064] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 03/12/2012] [Accepted: 03/24/2012] [Indexed: 11/19/2022]
Abstract
In recent years, multivariate optimization has played an increasing role in analytical method development. ICH guidelines recommend using statistical design of experiments to identify the design space, in which multivariate combinations of composition variables and process variables have been demonstrated to provide quality results. Considering a microemulsion electrokinetic chromatography method (MEEKC), the performance of the electrophoretic run depends on the proportions of mixture components (MCs) of the microemulsion and on the values of process variables (PVs). In the present work, for the first time in the literature, a mixture-process variable (MPV) approach was applied to optimize a MEEKC method for the analysis of coenzyme Q10 (Q10), ascorbic acid (AA), and folic acid (FA) contained in nutraceuticals. The MCs (buffer, surfactant-cosurfactant, oil) and the PVs (voltage, buffer concentration, buffer pH) were simultaneously changed according to a MPV experimental design. A 62-run MPV design was generated using the I-optimality criterion, assuming a 46-term MPV model allowing for special-cubic blending of the MCs, quadratic effects of the PVs, and some MC-PV interactions. The obtained data were used to develop MPV models that express the performance of an electrophoretic run (measured as peak efficiencies of Q10, AA, and FA) in terms of the MCs and PVs. Contour and perturbation plots were drawn for each of the responses. Finally, the MPV models and criteria for the peak efficiencies were used to develop the design space and an optimal subregion (i.e., the settings of the mixture MCs and PVs that satisfy the respective criteria), as well as a unique optimal combination of MCs and PVs.
Collapse
Affiliation(s)
- G Piepel
- Applied Statistics and Computational Modeling, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington, USA
| | | | | | | | | | | |
Collapse
|
13
|
Michalkiewicz S. Anodic oxidation of oxidized forms of coenzymes Q10 and Q0 on carbon electrodes in acetic acid solutions. Bioelectrochemistry 2011; 82:103-11. [DOI: 10.1016/j.bioelechem.2011.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 05/23/2011] [Accepted: 06/12/2011] [Indexed: 10/18/2022]
|
14
|
Voltammetric techniques for the assay of pharmaceuticals—A review. Anal Biochem 2011; 408:179-96. [DOI: 10.1016/j.ab.2010.09.027] [Citation(s) in RCA: 276] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Revised: 09/17/2010] [Accepted: 09/18/2010] [Indexed: 11/20/2022]
|
15
|
Michalkiewicz S, Skorupa A. Anodic oxidation of 3,4-dihydroxyphenylacetic acid on carbon electrodes in acetic acid solutions. Bioelectrochemistry 2010; 79:57-65. [DOI: 10.1016/j.bioelechem.2009.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2009] [Revised: 10/29/2009] [Accepted: 11/19/2009] [Indexed: 10/20/2022]
|
16
|
Lucangioli S, Sabrina F, Mario C, Valeria T. A capillary electrophoretic system based on a novel microemulsion for the analysis of coenzyme Q10 in human plasma by electrokinetic chromatography. Electrophoresis 2009; 30:1899-905. [DOI: 10.1002/elps.200800783] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|