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Qiu Y, Zhang T, Zhang P. Fate and environmental behaviors of microplastics through the lens of free radical. JOURNAL OF HAZARDOUS MATERIALS 2023; 453:131401. [PMID: 37086675 DOI: 10.1016/j.jhazmat.2023.131401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/04/2023] [Accepted: 04/11/2023] [Indexed: 05/03/2023]
Abstract
Microplastics (MPs), as plastics with a size of less than 5 mm, are ubiquitously present in the environment and become an increasing environmental concern. The fate and environmental behavior of MPs are significantly influenced by the presence of free radicals. Free radicals can cause surface breakage, chemical release, change in crystallinity and hydrophilicity, and aggregation of MPs. On the other hand, the generation of free radicals with a high concentration and oxidation potential can effectively degrade MPs. There is a limited review article to bridge the fate and environmental behaviors of MP with free radicals and their reactions. This paper reviews the sources, types, detection methods, generation mechanisms, and influencing factors of free radicals affecting the environmental processes of MPs, the environmental effects of MPs controlled by free radicals, and the degradation strategies of MPs based on free radical-associated technologies. Moreover, this review elaborates on the limitations of the current research and provides ideas for future research on the interactions between MPs and free radicals to better explain their environmental impacts and control their risks. This article aims to keep the reader abreast of the latest development in the fate and environmental behaviors of MP with free radicals and their reactions and to bridge free radical chemistry with MP control methodology.
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Affiliation(s)
- Ye Qiu
- College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, 38 Tongyan Rd., Tianjin 300350, China; Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macao Special Administrative Region of China
| | - Tong Zhang
- College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, 38 Tongyan Rd., Tianjin 300350, China.
| | - Ping Zhang
- Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macao Special Administrative Region of China.
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2
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Akrivi EA, Vlessidis AG, Kourkoumelis N, Giokas DL, Tsogas GZ. Gold-activated luminol chemiluminescence for the selective determination of cysteine over homocysteine and glutathione. Talanta 2022; 245:123464. [PMID: 35460979 DOI: 10.1016/j.talanta.2022.123464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/02/2022] [Accepted: 04/05/2022] [Indexed: 12/17/2022]
Abstract
This work reports a chemiluminescence assay for the highly selective determination of cysteine in biological fluids without separation techniques. The method is based on the ability of cysteine to selectively enhance the metal-catalyzed chemiluminescence generated by the oxidation of luminol from gold tetrachloride anions under alkaline conditions. The selectivity of the method stems from the fact that, under strongly alkaline conditions, the formation of the four-membered ring transition state of cysteine is less favorable as compared to the formation of the respective 5- and 9- membered ring transition states of homocysteine and glutathione, respectively. These transition states exert stronger hindrance and hydrophobic interactions repelling the negatively charged luminol dianion and possibly exhibit lower reducing ability for dissolved oxygen, towards the formation of superoxide radicals, thus reducing the oxidation of luminol. Under the optimum experimental conditions, the linear range of the method extended from 0.5 to 20 μΜ while cysteine could be determined at concentrations as low as 0.5 μM, with good reproducibility (<3.5%) and recoveries between 80 and 93% in artificial and real biological fluids.
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Affiliation(s)
- E A Akrivi
- Department of Medical Physics, School of Health Sciences, University of Ioannina, 45110, Ioannina, Greece; Neurology Clinic, University Hospital of Ioannina, 45110, Ioannina, Greece
| | - A G Vlessidis
- Department of Chemistry, School of Natural Sciences, University of Ioannina, 45110, Ioannina, Greece
| | - N Kourkoumelis
- Department of Medical Physics, School of Health Sciences, University of Ioannina, 45110, Ioannina, Greece
| | - D L Giokas
- Department of Chemistry, School of Natural Sciences, University of Ioannina, 45110, Ioannina, Greece.
| | - G Z Tsogas
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, GR-54124, Thessaloniki, Greece.
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3
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Jayaram R, Jones M, Reilly S, Crabtree MJ, Pal N, Goodfellow N, Nahar K, Simon J, Carnicer R, DeSilva R, Ratnatunga C, Petrou M, Sayeed R, Roalfe A, Channon KM, Bashir Y, Betts T, Hill M, Casadei B. Atrial nitroso-redox balance and refractoriness following on-pump cardiac surgery: a randomized trial of atorvastatin. Cardiovasc Res 2022; 118:184-195. [PMID: 33098411 PMCID: PMC8752359 DOI: 10.1093/cvr/cvaa302] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 09/07/2020] [Accepted: 10/12/2020] [Indexed: 01/19/2023] Open
Abstract
AIMS Systemic inflammation and increased activity of atrial NOX2-containing NADPH oxidases have been associated with the new onset of atrial fibrillation (AF) after cardiac surgery. In addition to lowering LDL-cholesterol, statins exert rapid anti-inflammatory and antioxidant effects, the clinical significance of which remains controversial. METHODS AND RESULTS We first assessed the impact of cardiac surgery and cardiopulmonary bypass (CPB) on atrial nitroso-redox balance by measuring NO synthase (NOS) and GTP cyclohydrolase-1 (GCH-1) activity, biopterin content, and superoxide production in paired samples of the right atrial appendage obtained before (PRE) and after CPB and reperfusion (POST) in 116 patients. The effect of perioperative treatment with atorvastatin (80 mg once daily) on these parameters, blood biomarkers, and the post-operative atrial effective refractory period (AERP) was then evaluated in a randomized, double-blind, placebo-controlled study in 80 patients undergoing cardiac surgery on CPB. CPB and reperfusion led to a significant increase in atrial superoxide production (74% CI 71-76%, n = 46 paired samples, P < 0.0001) and a reduction in atrial tetrahydrobiopterin (BH4) (34% CI 33-35%, n = 36 paired samples, P < 0.01), and in GCH-1 (56% CI 55-58%, n = 26 paired samples, P < 0.001) and NOS activity (58% CI 52-67%, n = 20 paired samples, P < 0.001). Perioperative atorvastatin treatment prevented the effect of CPB and reperfusion on all parameters but had no significant effect on the postoperative right AERP, troponin release, or NT-proBNP after cardiac surgery. CONCLUSION Perioperative statin therapy prevents post-reperfusion atrial nitroso-redox imbalance in patients undergoing on-pump cardiac surgery but has no significant impact on postoperative atrial refractoriness, perioperative myocardial injury, or markers of postoperative LV function. CLINICAL TRIAL REGISTRATION https://clinicaltrials.gov/ct2/show/NCT01780740.
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Affiliation(s)
- Raja Jayaram
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Michael Jones
- Cardiology, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Svetlana Reilly
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Mark J Crabtree
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Nikhil Pal
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Nicola Goodfellow
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Keshav Nahar
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Jillian Simon
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Ricardo Carnicer
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Ravi DeSilva
- Cardiothoracic Surgery, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Chandana Ratnatunga
- Cardiothoracic Surgery, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Mario Petrou
- Cardiothoracic Surgery, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Rana Sayeed
- Cardiothoracic Surgery, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Andrea Roalfe
- Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
| | - Keith M Channon
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
| | - Yaver Bashir
- Cardiology, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Timothy Betts
- Cardiology, Oxford Heart Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Michael Hill
- Clinical Trial Service Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - Barbara Casadei
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, L6, West Wing, Oxford OX3 9DU, UK
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4
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A Porous Tantalum-Based Metal–Organic Framework (Tα-MOF) as a Novel and Highly Efficient Peroxidase Mimic for Colorimetric Evaluation of the Antioxidant Capacity. Catal Letters 2020. [DOI: 10.1007/s10562-020-03137-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Colorimetric evaluation of the hydroxyl radical scavenging ability of antioxidants using carbon-confined CoOx as a highly active peroxidase mimic. Mikrochim Acta 2019; 186:354. [DOI: 10.1007/s00604-019-3488-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 05/05/2019] [Indexed: 10/26/2022]
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6
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Wang YQ, Zhuang G, Li SJ. Multiple on-line screening and identification methods for hydroxyl radical scavengers in Yudanshen. J Pharm Biomed Anal 2018; 156:278-283. [DOI: 10.1016/j.jpba.2018.04.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 04/23/2018] [Accepted: 04/25/2018] [Indexed: 01/05/2023]
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7
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Gatselou V, Christodouleas DC, Kouloumpis A, Gournis D, Giokas DL. Determination of phenolic compounds using spectral and color transitions of rhodium nanoparticles. Anal Chim Acta 2016; 932:80-7. [DOI: 10.1016/j.aca.2016.05.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Revised: 05/17/2016] [Accepted: 05/20/2016] [Indexed: 10/21/2022]
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8
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Murillo Pulgarín JA, García Bermejo LF, Carrasquero Durán A. Determination of Antioxidant Activity of Hibiscus Flowers by Flow Injection Analysis with Chemiluminescence Detection. ANAL LETT 2016. [DOI: 10.1080/00032719.2016.1167216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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10
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Saifullah B, Hussein MZB. Inorganic nanolayers: structure, preparation, and biomedical applications. Int J Nanomedicine 2015; 10:5609-33. [PMID: 26366081 PMCID: PMC4562743 DOI: 10.2147/ijn.s72330] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Hydrotalcite-like compounds are two-dimensional inorganic nanolayers also known as clay minerals or anionic clays or layered double hydroxides/layered hydroxy salts, and have emerged as a single type of material with numerous biomedical applications, such as drug delivery, gene delivery, cosmetics, and biosensing. Inorganic nanolayers are promising materials due to their fascinating properties, such as ease of preparation, ability to intercalate different type of anions (inorganic, organic, biomolecules, and even genes), high thermal stability, delivery of intercalated anions in a sustained manner, high biocompatibility, and easy biodegradation. Inorganic nanolayers have been the focus for researchers over the last decade, resulting in widening application horizons, especially in the field of biomedical science. These nanolayers have been widely applied in drug and gene delivery. They have also been applied in biosensing technology, and most recently in bioimaging science. The suitability of inorganic nanolayers for application in drug delivery, gene delivery, biosensing technology, and bioimaging science makes them ideal materials to be applied for theranostic purposes. In this paper, we review the structure, methods of preparation, and latest advances made by inorganic nanolayers in such biomedical applications as drug delivery, gene delivery, biosensing, and bioimaging.
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Affiliation(s)
- Bullo Saifullah
- Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Serdang, Malaysia
| | - Mohd Zobir B Hussein
- Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Serdang, Malaysia
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11
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Determination of Glucose and Cholesterol Using a Novel Optimized Luminol- CuO Nanoparticles-H2O2 Chemiluminescence Method by Box–Behnken Design. J Fluoresc 2015; 25:861-70. [DOI: 10.1007/s10895-015-1566-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2014] [Accepted: 04/09/2015] [Indexed: 10/23/2022]
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12
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Christodouleas DC, Giokas DL, Garyfali V, Papadopoulos K, Calokerinos AC. An automatic FIA-CL method for the determination of antioxidant activity of edible oils based on peroxyoxalate chemiluminescence. Microchem J 2015. [DOI: 10.1016/j.microc.2014.08.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Nalewajko-Sieliwoniuk E, Malejko J, Święczkowska M, Kowalewska A. A study on the selection of chemiluminescence system for the flow injection determination of the total polyphenol index of plant-derived foods. Food Chem 2014; 176:175-83. [PMID: 25624221 DOI: 10.1016/j.foodchem.2014.12.053] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 12/04/2014] [Accepted: 12/13/2014] [Indexed: 11/19/2022]
Abstract
Different chemiluminescence systems based on luminol, permanganate, manganese(IV) and cerium(IV) reagents were compared regarding their sensitivity and selectivity to determine plant polyphenols. Among the seventeen systems tested, Mn(IV)-formaldehyde-hexametaphosphate was considered to be the most suitable for polyphenols detection. The developed flow injection method (FI-CL) based on enhancing effect of polyphenols on Mn(IV) chemiluminescence is characterised by low detection limit of gallic acid (0.02μgL(-1)) and high precision (RSD=1.7%). The calibration graph was linear from 0.1 to 100μgL(-1). The selectivity studies revealed that the FI-CL method ensures accurate determination of the total polyphenols content in food samples. The method was successfully applied to analysis of a variety of plant-derived foods (wine, tea, cereal coffee, fruit and vegetable juices, herbs and spices). The proposed method is superior to conventional spectrophotometric assays due to its higher sample throughput (195samplesh(-1)), simplicity, sensitivity and, above all, higher selectivity.
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Affiliation(s)
- Edyta Nalewajko-Sieliwoniuk
- Department of Analytical Chemistry, Institute of Chemistry, University of Białystok, Hurtowa 1, 15-399 Białystok, Poland
| | - Julita Malejko
- Department of Analytical Chemistry, Institute of Chemistry, University of Białystok, Hurtowa 1, 15-399 Białystok, Poland.
| | - Marta Święczkowska
- Department of Analytical Chemistry, Institute of Chemistry, University of Białystok, Hurtowa 1, 15-399 Białystok, Poland
| | - Agata Kowalewska
- Department of Analytical Chemistry, Institute of Chemistry, University of Białystok, Hurtowa 1, 15-399 Białystok, Poland
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14
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Choleva TG, Kappi FA, Giokas DL, Vlessidis AG. Paper-based assay of antioxidant activity using analyte-mediated on-paper nucleation of gold nanoparticles as colorimetric probes. Anal Chim Acta 2014; 860:61-9. [PMID: 25682248 DOI: 10.1016/j.aca.2014.12.025] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 12/08/2014] [Accepted: 12/12/2014] [Indexed: 02/06/2023]
Abstract
With the increasing interest in the health benefits arising from the consumption of dietary products rich in antioxidants, there exists a clear demand for easy-to-use and cost-effective tests that can be used for the identification of the antioxidant power of food products. Paper-based analytical devices constitute a remarkable platform for such expedient and low-cost assays with minimal external resources but efforts in this direction are still scarce. In this work we introduce a new paper-based device in the form of a sensor patch that enables the determination of antioxidant activity through analyte-driven on-paper formation of gold nanoparticles. The principle of detection capitalizes, for the first time, on the on-paper nucleation of gold ions to its respective nanoparticles, upon reduction by antioxidant compounds present in an aqueous sample. The ensuing chromatic transitions, induced on the paper surface, are used as an optical "signature" of the antioxidant strength of the solution. The response of the paper-based sensor was evaluated against a large variety of antioxidant species and the respective dose response curves were constructed. On the basis of these data, the contribution of each species according to its chemical structure was elucidated. For the analysis of real samples, a concentration-dependent colorimetric response was established against Gallic acid equivalents over a linear range of 10 μM-1.0 mM, with detection limits at the low and ultra-low μM levels (i.e. <1.0 μM) and satisfactory precision (RSD=3.6-12.6%). The sensor has been tested for the assessment of antioxidant activity in real samples (teas and wines) and the results correlated well with commonly used antioxidant detection methods. Importantly, the sensor performed favorably for long periods of time when stored at moisture-free and low temperature conditions without losing its activity thus posing as an attractive alternative to the assessment of antioxidant activity without specialized equipment. The use of the sensor by non-experts for a rapid assessment of natural products in field testing is envisioned. Importantly, we demonstrate for the first time that analyte-mediated growth of nanomaterials directly on the paper surface could open new opportunities in paper-based analytical devices.
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Affiliation(s)
- Tatiana G Choleva
- Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
| | - Foteini A Kappi
- Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
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15
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Christodouleas DC, Fotakis C, Papadopoulos K, Calokerinos AC. Evaluation of total reducing power of edible oils. Talanta 2014; 130:233-40. [PMID: 25159404 DOI: 10.1016/j.talanta.2014.06.058] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 06/24/2014] [Accepted: 06/26/2014] [Indexed: 11/28/2022]
Abstract
The lipophilicity of untreated edible oils narrows the application of most published methods for the determination of antioxidant activity to hydrophilic extracts of oils. This research addresses the issue of the estimation of the total antioxidant properties of untreated edible oils by modifying two widely applied analytical methods, the Fe-Phenanthroline and the CUPRAC assays, to be used in untreated oils. The modifications pertain to the selection of mixture of solvents (ethanol-butanol in 3:1 v/v ratio), and the optimization of the reaction conditions (reagents concentration and reaction time). The developed methods were applied to a number of hydrophilic and lipophilic standard compounds and different types of commercial edible oils, as well as their corresponding aqueous or organic extracts. This implementation elucidated the differences in the antioxidant content of edible oils. All the results were compared to those of the DPPH and Folin-Ciocalteu methods and the analytical figures of merit for the methods have been estimated. Lastly, it was concluded that the modified CUPRAC assay has higher sensitivity compared to the Fe-Phenanthroline assay.
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Affiliation(s)
- Dionysios C Christodouleas
- Laboratory of Analytical Chemistry, Department of Chemistry, School of Sciences, National and Kapodistrian University of Athens, Panepistiomiopolis, 15771 Athens, Greece; Division of Physical Chemistry, IAMPPNM, NCSR Demokritos, Agia Paraskevi Attikis, 15310 Athens, Greece
| | - Charalambos Fotakis
- Laboratory of Analytical Chemistry, Department of Chemistry, School of Sciences, National and Kapodistrian University of Athens, Panepistiomiopolis, 15771 Athens, Greece
| | - Kyriakos Papadopoulos
- Division of Physical Chemistry, IAMPPNM, NCSR Demokritos, Agia Paraskevi Attikis, 15310 Athens, Greece
| | - Antony C Calokerinos
- Laboratory of Analytical Chemistry, Department of Chemistry, School of Sciences, National and Kapodistrian University of Athens, Panepistiomiopolis, 15771 Athens, Greece.
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16
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Tsogas GZ, Giokas DL, Vlessidis AG. Ultratrace Determination of Silver, Gold, and Iron Oxide Nanoparticles by Micelle Mediated Preconcentration/Selective Back-Extraction Coupled with Flow Injection Chemiluminescence Detection. Anal Chem 2014; 86:3484-92. [DOI: 10.1021/ac404071v] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- George Z. Tsogas
- Laboratory of Analytical
Chemistry, Department of Chemistry, University of Ioannina, Ioannina, Epirus 45110, Greece
| | - Dimosthenis L. Giokas
- Laboratory of Analytical
Chemistry, Department of Chemistry, University of Ioannina, Ioannina, Epirus 45110, Greece
| | - Athanasios G. Vlessidis
- Laboratory of Analytical
Chemistry, Department of Chemistry, University of Ioannina, Ioannina, Epirus 45110, Greece
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17
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Wang J, Tan X, Song Z. Comparison of uric Acid quantity with different food in human urine by flow injection chemiluminescence analysis. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2013; 2013:854041. [PMID: 24251067 PMCID: PMC3819757 DOI: 10.1155/2013/854041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Accepted: 09/05/2013] [Indexed: 06/02/2023]
Abstract
Based on the inhibitory effect of uric acid (UA) on luminol-Co(2+) chemiluminescence (CL) system, a sensitive method for the determination of UA at nanomolar level by flow injection (FI) CL was proposed. The proposed method was successfully applied to real-time monitoring of UA excretion in human 24 h urine with different food intake, showing that meats, vegetables, and porridge intake caused differential UA excretions of 879, 798, and 742 mg, respectively. It was also found that UA concentrations in urine under the three kinds of food intake simultaneously reached maximum at 2 h after meals with the values of 417, 318, and 288 μg mL(-1), respectively. The UA concentration in human serum was also determined by this approach, and the possible mechanism of luminol-Co(2+)-UA CL reaction was discussed in detail.
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Affiliation(s)
- Jiajia Wang
- Key Laboratory of Synthetic and Natural Functional Molecule, Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, China
| | - Xijuan Tan
- Key Laboratory of Synthetic and Natural Functional Molecule, Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, China
| | - Zhenghua Song
- Key Laboratory of Synthetic and Natural Functional Molecule, Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, China
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18
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Zargoosh K, Ghayeb Y, Azmoon B, Qandalee M. Simple and fast PO-CL method for the evaluation of antioxidant capacity of hydrophilic and hydrophobic antioxidants. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 112:1-6. [PMID: 23665483 DOI: 10.1016/j.saa.2013.04.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 03/19/2013] [Accepted: 04/02/2013] [Indexed: 06/02/2023]
Abstract
A simple and fast procedure is described for evaluating the antioxidant activity of hydrophilic and hydrophobic compounds by using the peroxyoxalate-chemiluminescence (PO-CL) reaction of Bis(2,4,6-trichlorophenyl) oxalate (TCPO) with hydrogen peroxide in the presence of di(tert-butyl)2-(tert-butylamino)-5-[(E)-2-phenyl-1-ethenyl]3,4-furandicarboxylate as a highly fluorescent fluorophore. The IC50 values of the well-known antioxidants were calculated and the results were expressed as gallic equivalent antioxidant capacity (GEAC). It was found that the proposed method is free of physical quenching and oxidant interference, for this reason, proposed method is able to determine the accurate scavenging activity of the antioxidants to the free radicals. Finally, the proposed method was applied to the evaluation of antioxidant activity of complex real samples such as soybean oil and sunflower oil (as hydrophobic samples) and honey (as hydrophilic sample). To the best of our knowledge, this is the first time that total antioxidant activity can be determined directly in soybean oil, sunflower oil and honey (not in their extracts) using PO-CL reactions.
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Affiliation(s)
- Kiomars Zargoosh
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
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19
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Evaluation of Antioxidant Capacity of Hydrophilic and Hydrophobic Antioxidants Using Peroxyoxalate Chemiluminescence Reaction of the Novel Furandicarboxylate Derivative. FOOD ANAL METHOD 2013. [DOI: 10.1007/s12161-013-9625-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Giokas DL, Christodouleas DC, Vlachou I, Vlessidis AG, Calokerinos AC. Development of a generic assay for the determination of total trihydroxybenzoate derivatives based on gold-luminol chemiluminescence. Anal Chim Acta 2012; 764:70-7. [PMID: 23374217 DOI: 10.1016/j.aca.2012.12.025] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 12/07/2012] [Accepted: 12/14/2012] [Indexed: 11/24/2022]
Abstract
A selective assay for the determination of one of the most important class of phenolic compounds, namely trihydroxybenzoates (monomeric and polymeric compounds having at least one gallate moiety) based on their enhancing effect on the chemiluminogenic reaction between gold ions and luminol is described for the first time. In the presence of trihydroxybenzoate derivatives, the light emission generated when alkaline luminol is oxidized by gold ions is amplified several orders of magnitude compared to other common phenolic compounds which exhibit minor reactivity or no reactivity at all (e.g. hydroxycinnamates, flavonols, benzenediols). Based on this property, the experimental conditions were optimized in order to enable the determination of total trihydroxybenzoates in complex mixtures without resorting to separation techniques. The method was applied to samples of different composition (teas, herbal infusions and wines) with satisfactory analytical features yielding detection limits at the 10(-7) mol L(-1) level, intra-day precision of 3.1%, inter-day precision less than 10% and recoveries between 88.7 and 97.6%. The strengths and weaknesses of the method were identified and discussed in relation to its application in real samples.
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Affiliation(s)
- Dimosthenis L Giokas
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
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Ma AJ, Chang YT, Lin WY. A kinetic treatment of stopped-flow time courses for multiple chemiluminescence of the KIO4-luminol-Mn2+system. LUMINESCENCE 2012; 28:355-62. [DOI: 10.1002/bio.2389] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Revised: 05/01/2012] [Accepted: 05/06/2012] [Indexed: 11/08/2022]
Affiliation(s)
- Ai-Jay Ma
- Department of Chemistry; National Taiwan University; Taipei; 106; Taiwan
| | - Yu-Tang Chang
- Department of Chemistry; National Taiwan University; Taipei; 106; Taiwan
| | - Wann-Yin Lin
- Department of Chemistry; National Taiwan University; Taipei; 106; Taiwan
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22
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Kim KM, Kim YH, Oh SH, Lee SH. A chelate complex-enhanced luminol system for selective determination of Co(II), Fe(II) and Cr(III). LUMINESCENCE 2012; 28:372-7. [DOI: 10.1002/bio.2392] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/26/2012] [Accepted: 05/11/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Kyung Min Kim
- Department of Chemistry; Kyungpook National University; Daegu; 702-701; Korea
| | - Young Ho Kim
- Research Institute of Advanced Energy Technology; Kyungpook National University; Daegu; 702-701; Korea
| | - Sang-Hyub Oh
- Center for Gas Analysis; Korea Research Institute of Standards and Science; Daejeon; 305-600; South Korea
| | - Sang Hak Lee
- Department of Chemistry; Kyungpook National University; Daegu; 702-701; Korea
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23
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Popa CV, Lungu L, Savoiu M, Bradu C, Dinoiu V, Danet AF. Total Antioxidant Activity and Phenols and Flavonoids Content of Several Plant Extracts. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2012. [DOI: 10.1080/10942912.2010.498545] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Fan H, Zheng T, Chen Y, Yang GZ. Chemical constituents with free-radical-scavenging activities from the stem of Fissistigma polyanthum. Pharmacogn Mag 2012; 8:98-102. [PMID: 22701280 PMCID: PMC3371445 DOI: 10.4103/0973-1296.96549] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 06/15/2011] [Accepted: 05/23/2012] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Fissistigma polyanthum is a liane belonging to the Annonaceae family and it is one of the most important crude drugs in traditional Chinese medicine. OBJECTIVE The objective was to describe the structural elucidation and the free-radical-scavenging activities of the isolated compounds from Fissistigma polyanthum. MATERIAL AND METHODS The chemical constituents were isolated and purified by normal, reverse column chromatography and HPLC. Their structures were identified by spectroscopic methods ((1)H NMR and (13)C NMR) and by comparison with literature values, and the free-radical-scavenging activities of these two compounds were also evaluated through three in vitro model systems (DPPH, trolox equivalent antioxidant capacity (TEAC) and Co (II) EDTA-induced luminol chemiluminescence by flow injection). RESULTS Two known compounds, named kanakugiol (1) and teutenone A (2), were isolated from the stem of Fissistigma polyanthum for the first time, and compound 1 exhibited moderate free-radical-scavenging activity. CONCLUSION Fissistigma polyanthum, which has traditionally been used as an important Chinese medicine, showed a certain free-radical-scavenging activity.
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Affiliation(s)
- Hua Fan
- Department of Natural Products, College of Pharmacy, South Central University for Nationalities, Wuhan, P.R., China
| | - Tong Zheng
- Department of Natural Products, College of Pharmacy, South Central University for Nationalities, Wuhan, P.R., China
| | - Yu Chen
- College of Chemistry and Material Sciences, South Central University for Nationalities, Wuhan, P.R, China
| | - Guang-Zhong Yang
- Department of Natural Products, College of Pharmacy, South Central University for Nationalities, Wuhan, P.R., China
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25
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Fassoula E, Economou A, Calokerinos A. Development and validation of a sequential-injection method with chemiluminescence detection for the high throughput assay of the total antioxidant capacity of wines. Talanta 2011; 85:1412-8. [DOI: 10.1016/j.talanta.2011.06.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 06/02/2011] [Accepted: 06/11/2011] [Indexed: 10/18/2022]
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26
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CHEN WEIJUN, ZHU QING, XIA QIUYU, CAO WEI, ZHAO SONGLIN, LIU JIANGKANG. REACTIVE OXYGEN SPECIES SCAVENGING ACTIVITY AND DNA PROTECTING EFFECT OF FRESH AND NATURALLY FERMENTED COCONUT SAP. J Food Biochem 2011. [DOI: 10.1111/j.1745-4514.2010.00506.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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27
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Use of the Attenuation of Luminol-Perborate Chemiluminescence with Flow Injection Analysis for the Total Antioxidant Activity in Tea Infusions, Wines, and Grape Seeds. FOOD ANAL METHOD 2011. [DOI: 10.1007/s12161-011-9246-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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28
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Huang TY, Lin WY. A stopped-flow study of the dual chemiluminescence for the luminol-KIO4-Mn2+ system in strong alkaline solutions. LUMINESCENCE 2011; 26:118-24. [DOI: 10.1002/bio.1193] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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29
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Chen Y, Fan H, Yang GZ, Jiang Y, Zhong FF, He HW. Two Unusual Xanthones from the Bark of Garcinia xanthochymus. Helv Chim Acta 2011. [DOI: 10.1002/hlca.201000287] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Wang Z, Xu H, Qian J, Ye J, Yang Z, Sun H, Shi Y. A flow-injection chemiluminescent method for the evaluation of the antioxidant activity of 5'-nucleotides. LUMINESCENCE 2011; 25:300-6. [PMID: 19536768 DOI: 10.1002/bio.1149] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In the present work, a simple chemiluminescence (CL) method coupled with flow-injection analysis for the evaluation of antioxidant activity of 5'-nucleotides (5'-AMP, 5'-CMP, 5'-GMP, 5'-UMP) was proposed. It is based on inhibition effect of the studied substances on CL emission of luminol-potassium ferricyanide-pyrogallol. Experiments were performed to evaluate the nature of the inhibition by 5'-nucleotides of the CL reaction and their antioxidant activities. Based on the experimental results, it was observed that 5'-nucleotides are available antioxidants that could effectively scavenge superoxide anion free radicals in a concentration-dependent way. This will provide a basis for further development of the use of nucleotides.
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Affiliation(s)
- Zhouping Wang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
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31
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Christodouleas D, Papadopoulos K, Calokerinos AC. Determination of Total Antioxidant Activity of Edible Oils as well as Their Aqueous and Organic Extracts by Chemiluminescence. FOOD ANAL METHOD 2011. [DOI: 10.1007/s12161-010-9189-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Fan H, Yang GZ, Zheng T, Mei ZN, Liu XM, Chen Y, Chen S. Chemical constituents with free-radical-scavenging activities from the stem of Microcos paniculata. Molecules 2010; 15:5547-60. [PMID: 20714312 PMCID: PMC6257753 DOI: 10.3390/molecules15085547] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 08/02/2010] [Accepted: 08/04/2010] [Indexed: 11/16/2022] Open
Abstract
The free-radical-scavenging activities of various solvent extracts of Microcos paniculata were evaluated through in vitro model systems, such as 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS) and Co (II) EDTA-induced luminol chemiluminescence by flow injection. In all three of these systems the ethyl acetate (EtOAc) extract showed the highest free-radical-scavenging activity compared with the other three (n-BuOH, water and petroleum ether) extracts. Free-radical-scavenging assay-guided chromatographic separation of the EtOAc extract, using a normal-phase and reverse-phase silica gel column chromatography yielded five compounds: a new triterpene named methyl 3beta-O-p-hydroxy-E-cinnamoyloxy-2alpha,23-dihydroxyolean-12-en-28-oate (1), whose spectral data are presented for the first time, together with four known compounds, epicatechin (2), 3-trans-feruloyl maslinic acid (3), maslinic acid (4) and sucrose (5). All of the compounds were isolated from Microcos paniculata for the first time. The compounds were identified by spectroscopic methods. Among them, compound 2 displayed significant free-radical-scavenging activity which is similar to that of standard antioxidant ascorbic acid (V(C)) and therefore may be a promising natural antioxidant.
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Affiliation(s)
- Hua Fan
- College of Pharmacy, South Central University for Nationalities, Wuhan 430074, China
| | - Guang-Zhong Yang
- College of Pharmacy, South Central University for Nationalities, Wuhan 430074, China
| | - Tong Zheng
- College of Pharmacy, South Central University for Nationalities, Wuhan 430074, China
| | - Zhi-Nan Mei
- College of Pharmacy, South Central University for Nationalities, Wuhan 430074, China
| | - Xiang-Ming Liu
- College of Biomedical Engineering, South Central University for Nationalities, Wuhan 430074, China
| | - Yu Chen
- College of Chemistry and Material Sciences, South Central University for Nationalities, Wuhan 430074, China
| | - Su Chen
- College of Biomedical Engineering, South Central University for Nationalities, Wuhan 430074, China
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Nalewajko-Sieliwoniuk E, Tarasewicz I, Kojło A. Flow injection chemiluminescence determination of the total phenolics levels in plant-derived beverages using soluble manganese(IV). Anal Chim Acta 2010; 668:19-25. [DOI: 10.1016/j.aca.2010.01.031] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2009] [Revised: 01/12/2010] [Accepted: 01/14/2010] [Indexed: 10/19/2022]
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34
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Wada M, Kira M, Kido H, Ikeda R, Kuroda N, Nishigaki T, Nakashima K. Semi-micro flow injection analysis method for evaluation of quenching effect of health foods or food additive antioxidants on peroxynitrite. LUMINESCENCE 2010; 26:191-5. [PMID: 20309857 DOI: 10.1002/bio.1206] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Revised: 11/25/2009] [Accepted: 01/18/2010] [Indexed: 11/10/2022]
Abstract
A semi-micro flow injection analysis (SMFIA) method for evaluation of quenching effect of food additive antioxidants or health foods on peroxynitrite (ONOO(-)) is described. The injected sample was carried with phosphate buffer containing NaNO(2), mixed with a trigger solution to generate ONOO(-) and then detected CL generated after mixing with luminol solution. Selective chemiluminescence caused by ONOO(-) in this generation system was confirmed by catalase treatment. Ascorbic acid (ASA), Trolox and ascorbyl palmitate (ASP) were used as food additive antioxidants. EC(50) values of ASA, Trolox and ASP were 2.6, 6.4 and 43 µg/mL, respectively. The amount of reagents required for an assay by this SMFIA system could reduce the time by a third compared with the conventional method previously reported. Furthermore, as an application of the proposed method, the quenching effect of commercially available Noni (Morinda citrifolia) juices was evaluated.
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Affiliation(s)
- Mitsuhiro Wada
- Graduate School of Biomedical Sciences, Course of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
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35
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Wu L, Ding XP, Zhu DN, Yu BY, Yan YQ. Study on the radical scavengers in the traditional Chinese medicine formula shengmai san by HPLC-DAD coupled with chemiluminescence (CL) and ESI-MS/MS. J Pharm Biomed Anal 2010; 52:438-45. [PMID: 20137877 DOI: 10.1016/j.jpba.2010.01.021] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Revised: 01/07/2010] [Accepted: 01/08/2010] [Indexed: 12/01/2022]
Abstract
Shengmai San (SMS) has been used for the treatment of cardiovascular disease in Asia for long-time. It has been reported that SMS can protect against oxidative stress and tune immune response in patients. In this paper, a high performance liquid chromatography-diode array detection-chemiluminescence (HPLC-DAD-CL) method for on-line detection was successfully applied to screen antioxidants in complex SMS extracts. The H(2)O(2) scavenging activity of every fraction of SMS extracts was measured to evaluate each contribution to the total anti-oxidative activities of the prescription, followed by structures identification of the main active components by LC/MS/MS. HPLC-DAD-CL method was also applied for comparing the scavenging rates of main active components between the individual herbs and SMS. Interestingly, we found that the scavenging activities of main components detected in the individual herbs were different from those in SMS. The experimental data indicated that drug interactions during decocting process could result in the changes of the antioxidants' solubility. This study demonstrated that HPLC-DAD-CL on-line assay was a useful technique for rapidly screening and identifying bioactive components from complex multi-herbal prescription.
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Affiliation(s)
- Lei Wu
- Department of Complex Prescription of TCM, China Pharmaceutical University, No. 24 Tongjia Lane, Nanjing 210009, China
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36
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Nobushi Y, Uchikura K. Selective Detection of Hydroxyl Radical Scavenging Capacity Based on Electrogenerated Chemiluminescence Detection Using Tris(2,2'-bipyridine)ruthenium(III) by Flow Injection Analysis. Chem Pharm Bull (Tokyo) 2010; 58:117-20. [DOI: 10.1248/cpb.58.117] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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37
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Development and validation of a chemiluminogenic method for the evaluation of antioxidant activity of hydrophilic and hydrophobic antioxidants. Anal Chim Acta 2009; 652:295-302. [DOI: 10.1016/j.aca.2009.08.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 07/31/2009] [Accepted: 08/12/2009] [Indexed: 11/23/2022]
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38
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Indirect chemiluminescence-based detection of mefenamic acid in pharmaceutical formulations by flow injection analysis and effect of gold nanocatalysts. Talanta 2009; 79:893-9. [DOI: 10.1016/j.talanta.2009.05.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 05/07/2009] [Accepted: 05/13/2009] [Indexed: 11/16/2022]
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39
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Ding XP, Qi J, Chang YX, Mu LL, Zhu DN, Yu BY. Quality control of flavonoids in Ginkgo biloba leaves by high-performance liquid chromatography with diode array detection and on-line radical scavenging activity detection. J Chromatogr A 2009; 1216:2204-10. [DOI: 10.1016/j.chroma.2008.08.115] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2008] [Revised: 08/29/2008] [Accepted: 08/29/2008] [Indexed: 01/17/2023]
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40
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Nalewajko-Sieliwoniuk E, Nazaruk J, Antypiuk E, Kojło A. Determination of phenolic compounds and their antioxidant activity in Erigeron acris L. extracts and pharmaceutical formulation by flow injection analysis with inhibited chemiluminescent detection. J Pharm Biomed Anal 2008; 48:579-86. [DOI: 10.1016/j.jpba.2008.05.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2007] [Revised: 05/21/2008] [Accepted: 05/21/2008] [Indexed: 11/29/2022]
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41
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Chen Y, Li S, Lin X, Luo H, Li G, Yao H. On-Line Screening and Identification of Radical Scavenging Compounds Extracted from Flos Lonicerae by LC-DAD–TOF-MS. Chromatographia 2008. [DOI: 10.1365/s10337-008-0695-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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42
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Teshima N, Nobuta T, Sakai T. Simultaneous Spectrophotometric Determination of Ascorbic Acid and Glutathione by Kinetic-Based Flow Injection Analysis. BUNSEKI KAGAKU 2008. [DOI: 10.2116/bunsekikagaku.57.327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Norio Teshima
- Department of Applied Chemistry, Aichi Institute of Technology
| | - Takuya Nobuta
- Department of Applied Chemistry, Aichi Institute of Technology
- (Present) Nitto Analytical Techno-Center Co., Ltd
| | - Tadao Sakai
- Department of Applied Chemistry, Aichi Institute of Technology
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