1
|
Rosa CE, Jorge FN, Luis GM, Juana CE, Edgar PD. 3D printed opto-microfluidic autonomous analyzer for photometric applications. HARDWAREX 2023; 14:e00406. [PMID: 36910021 PMCID: PMC9999204 DOI: 10.1016/j.ohx.2023.e00406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 02/08/2023] [Accepted: 02/17/2023] [Indexed: 06/18/2023]
Abstract
3D printed opto-microfluidic autonomous analyzer for photometric applications performs the automation of analytical micro-processes. The proposed device was designed under restrictions of small size and low energy consumption, which allow its portability for in-situ, on line and real time analysis. The autonomous process and auto-calibration consists of four functions: control and data acquisition; hydrodynamic: fluid pumping and flow injection; optical detection and wireless communication. All electronics systems where controlled with a virtual instrument interface. In the experiments carried out to measure fluorides, the results obtained were very close to those obtained with laboratory equipment. The consumption of reagents was 50% less and waste was reduced by 80%. The cost of the portable and autonomous microanalyzer is 75% less than large and robust laboratory equipment.
Collapse
Affiliation(s)
- Camarillo-Escobedo Rosa
- National Technological Institute of Mexico – La Laguna, Mechanic and Mechatronics Department, Blvd. Revolución & Calz. Cuauhtemoc S/N, Torreon, Coah., Mexico
- Universidad de Guadalajara-CUCEI, Translational Biomedical Engineering Department, Av. Revolución #1500, Guadalajara, Jal, Mexico
| | - Flores-Nuñez Jorge
- Universidad de Guadalajara-CUCEI, Translational Biomedical Engineering Department, Av. Revolución #1500, Guadalajara, Jal, Mexico
| | - García-Muñoz Luis
- National Technological Institute of Mexico – La Laguna, Computer System Department, Revolución & Calz. Cuauhtemoc S/N Torreon, Coah., Mexico
| | - Camarillo-Escobedo Juana
- National Technological Institute of Mexico – La Laguna, Electric and Electronic Department, Blvd. Revolución & Calz. Cuauhtemoc S/N, Torreon, Coah., Mexico
| | - Peña-Dominguez Edgar
- National Technological Institute of Mexico – La Laguna, Mechanic and Mechatronics Department, Blvd. Revolución & Calz. Cuauhtemoc S/N, Torreon, Coah., Mexico
| |
Collapse
|
2
|
González-Conde M, Vega J, López-Figueroa F, García-Castro M, Moscoso A, Sarabia F, López-Romero JM. Green Synthesis of Silver Nanoparticles and Its Combination with Pyropia columbina (Rhodophyta) Extracts for a Cosmeceutical Application. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1010. [PMID: 36985903 PMCID: PMC10054154 DOI: 10.3390/nano13061010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/06/2023] [Accepted: 03/09/2023] [Indexed: 06/18/2023]
Abstract
We report the green synthesis of silver nanoparticles (AgNPs) by using daisy petals (Bellis perennis), leek (Allium porrum) and garlic skin (Allium sativum) as reducing agents and water as solvent. AgNPs are obtained with high monodispersity, spherical shapes and size ranging from 5 to 35 nm and characterized by UV-Vis and TEM techniques. The obtained yields in AgNPs are in concordance with the total phenolic content of each plant. We also study the incorporation of AgNPs in combination with the red algae Pyropia columbina extracts (PCE) into cosmetic formulations and analyze their combined effect as photoprotective agents. Moreover, we carry out the inclusion of the PCE containing mycosporine-like amino acids (MAAs), which are strong UV-absorbing and antioxidant compounds, into β-cyclodextrin (βCD) and pNIPAM nanoparticles and analyze stability and release. The thermoresponsive polymer is grown by free radical polymerization using N-isopropylacrylamide (NIPAM) as the monomer, N,N'-methylenebisacrylamide (BIS) as the cross-linker, and 2,2'-azobis(2-methylpropionamidene) (V50) as the initiator, while βCD complex is prepared by heating in water. We evaluate the nanoparticle and βCD complex formation by UV-Vis and FT-IR, and NMR spectroscopies, respectively, and the nanoparticles' morphology, including particle size, by TEM. The cosmetic formulations are subsequently subjected to accelerated stability tests and photoprotective analyses: a synergistic effect in the combination of AgNPs and PCE in photoprotection was found. It is not related to a UV screen effect but to the antioxidant activity, having potential against photoaging.
Collapse
Affiliation(s)
- Mercedes González-Conde
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Julia Vega
- Andalusian Institute of Blue Biotechnology and Development (IBYDA) Experimental Center Grice Hutchinson, University of Málaga, Lomas de San Julián, 2, 29004 Malaga, Spain
| | - Félix López-Figueroa
- Andalusian Institute of Blue Biotechnology and Development (IBYDA) Experimental Center Grice Hutchinson, University of Málaga, Lomas de San Julián, 2, 29004 Malaga, Spain
| | - Miguel García-Castro
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Ana Moscoso
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Francisco Sarabia
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - J. Manuel López-Romero
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| |
Collapse
|
3
|
Kościelniak P. White calibration methods based on gradient techniques as a modern approach to quantitative flow analysis. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
4
|
Rocha FRP, Zagatto EAG. Chemical Derivatization in Flow Analysis. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27051563. [PMID: 35268664 PMCID: PMC8912107 DOI: 10.3390/molecules27051563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/17/2022] [Accepted: 02/24/2022] [Indexed: 11/16/2022]
Abstract
Chemical derivatization for improving selectivity and/or sensitivity is a common practice in analytical chemistry. It is particularly attractive in flow analysis in view of its highly reproducible reagent addition(s) and controlled timing. Then, measurements without attaining the steady state, kinetic discrimination, exploitation of unstable reagents and/or products, as well as strategies compliant with Green Analytical Chemistry, have been efficiently exploited. Flow-based chemical derivatization has been accomplished by different approaches, most involving flow and manifold programming. Solid-phase reagents, novel strategies for sample insertion and reagent addition, as well as to increase sample residence time have been also exploited. However, the required alterations in flow rates and/or manifold geometry may lead to spurious signals (e.g., Schlieren effect) resulting in distorted peaks and a noisy/drifty baseline. These anomalies can be circumvented by a proper flow system design. In this review, these aspects are critically discussed mostly in relation to spectrophotometric and luminometric detection.
Collapse
|
5
|
Green Nanotechnology: Plant-Mediated Nanoparticle Synthesis and Application. NANOMATERIALS 2022; 12:nano12040673. [PMID: 35215000 PMCID: PMC8878231 DOI: 10.3390/nano12040673] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 01/31/2022] [Accepted: 02/03/2022] [Indexed: 01/09/2023]
Abstract
The key pathways for synthesizing nanoparticles are physical and chemical, usually expensive and possibly hazardous to the environment. In the recent past, the evaluation of green chemistry or biological techniques for synthesizing metal nanoparticles from plant extracts has drawn the attention of many researchers. The literature on the green production of nanoparticles using various metals (i.e., gold, silver, zinc, titanium and palladium) and plant extracts is discussed in this study. The generalized mechanism of nanoparticle synthesis involves reduction, stabilization, nucleation, aggregation and capping, followed by characterization. During biosynthesis, major difficulties often faced in maintaining the structure, size and yield of particles can be solved by monitoring the development parameters such as temperature, pH and reaction period. To establish a widely accepted approach, researchers must first explore the actual process underlying the plant-assisted synthesis of a metal nanoparticle and its action on others. The green synthesis of NPs is gaining attention owing to its facilitation of the development of alternative, sustainable, safer, less toxic and environment-friendly approaches. Thus, green nanotechnology using plant extract opens up new possibilities for the synthesis of novel nanoparticles with the desirable characteristics required for developing biosensors, biomedicine, cosmetics and nano-biotechnology, and in electrochemical, catalytic, antibacterial, electronics, sensing and other applications.
Collapse
|
6
|
Paluch J, Kozak J, Mermer K, Molęda I, Wieczorek M, Kalinowski S, Kościelniak P. Novel Integrated Flow-Based Steam Distillation and Titration System for Determination of Volatile Acidity in Wines. Molecules 2021; 26:molecules26247673. [PMID: 34946754 PMCID: PMC8708693 DOI: 10.3390/molecules26247673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/14/2021] [Accepted: 12/15/2021] [Indexed: 12/03/2022] Open
Abstract
Novel integrated flow-based steam distillation and titration system with spectrophotometric detection was developed for determination of volatile acidity in wines. Using the system, the distillation procedure was carried out in an automatic manner, starting with introducing into a heated steam distillation module a sample and subjecting it to steam distillation. Under selected conditions, all the analyte was transferred to the distillate; therefore, the system did not require calibration. The collected distillate and titrant were introduced into the next monosegments in varying proportions, in accordance with the developed titration procedure, and directed to the detection system to record the titration curve. The titration was stopped after reaching the end point of titration. Procedures for distillation and titration were developed and verified separately by distillation of acetic acid, acetic acid in the presence of tartaric acid as well as acetic acid, tartaric acid, and titratable acidity, with precision (relative standard deviation) and accuracy (relative error) for both procedures lower than 6.9 and 5.6%, respectively. The developed steam distillation and titration systems were used to determine volatile acidity in samples of white and rosé wines separately and as the integrated steam distillation and titration system, both with precision lower than 9.4% and accuracy better than 6.7%.
Collapse
Affiliation(s)
- Justyna Paluch
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.M.); (I.M.); (M.W.); (P.K.)
- Correspondence: (J.P.); (J.K.)
| | - Joanna Kozak
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.M.); (I.M.); (M.W.); (P.K.)
- Correspondence: (J.P.); (J.K.)
| | - Karolina Mermer
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.M.); (I.M.); (M.W.); (P.K.)
| | - Iwona Molęda
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.M.); (I.M.); (M.W.); (P.K.)
| | - Marcin Wieczorek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.M.); (I.M.); (M.W.); (P.K.)
| | - Sławomir Kalinowski
- Department of Chemistry, University of Warmia and Mazury, Plac Łódzki 4, 10-957 Olsztyn, Poland;
| | - Paweł Kościelniak
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.M.); (I.M.); (M.W.); (P.K.)
| |
Collapse
|
7
|
Brandão EG, Perdigão SRW, Reis BF. A new flow cell design for chemiluminescence detection using an improved signal transduction network. Determination of hydrogen peroxide in pharmaceuticals. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
8
|
Silva MLS. Microfluidic devices for glycobiomarker detection in cancer. Clin Chim Acta 2021; 521:229-243. [PMID: 34273337 DOI: 10.1016/j.cca.2021.07.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/07/2021] [Accepted: 07/12/2021] [Indexed: 12/20/2022]
Abstract
During oncogenesis, several alterations occur within cells, one of them being the abnormal glycosylation of proteins, resulting in the formation of glycoproteins with aberrant glycan structures, which can be secreted into the blood stream. Their specific association to tumour cells makes them useful indicators (biomarkers) of the oncogenic process and their detection in blood can be employed in different stages of tumour development for early detection, prognosis and therapeutic drug monitoring. Due to the importance of detecting cancer-associated glycoproteins with aberrant glycosylation in blood or serum, analytical methodologies with improved performance are required to ameliorate the laboratorial tests currently used for the detection of these analytes. Microfluidics was created to facilitate the implementation of simple and point-of-care analysis, away from a centralized laboratory. The massive use of microfluidic systems in clinical settings can be seen in pregnancy tests and diabetes control, for example. But what about other clinical domains, such as the detection of glycoproteins with aberrant glycans secreted by tumour cells? Are microfluidic systems helpful in this case? This review analyses the requirements of a microfluidic assay for the detection of low-abundant blood/serum cancer-associated glycoproteins with abnormal glycans and the progresses that have been made in the last years to develop integrated microfluidic devices for this particular application. The diverse microfluidic systems found in literature present, in general, the same analytical performance as the conventional assays but have additional advantages, namely a reduction in assay times, a decrease of sample and reagent consumption and lower costs. The review will also focus on the improvements that are still needed for better biosensing of this type of cancer biomarkers using microfluidic devices.
Collapse
Affiliation(s)
- M Luísa S Silva
- Centre of Chemical Research, Autonomous University of Hidalgo State, Carr. Pachuca-Tulancingo km 4.5, Pachuca, Hidalgo 42076, Mexico.
| |
Collapse
|
9
|
Automated liquid-liquid microextraction and determination of sulfonamides in urine samples based on Schiff bases formation in natural deep eutectic solvent media. Talanta 2021; 234:122660. [PMID: 34364468 DOI: 10.1016/j.talanta.2021.122660] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/22/2021] [Accepted: 06/24/2021] [Indexed: 12/13/2022]
Abstract
In this work, an automated liquid-liquid microextraction procedure for the determination of sulfonamides (sulfamethoxazole, sulfamethazine and sulfapyridine) in urine samples using natural deep eutectic solvent is presented for the first time. The mechanism for extraction of sulfonamides was based on the formation of colored Schiff bases in the presence of vanillin, which acted as a derivatization reagent and precursor of natural deep eutectic solvent (an extractant). In this procedure, thymol was used as both media for Schiff bases formation and as a second precursor of the natural deep eutectic solvent. The formation of the Schiff bases was confirmed by mass spectrometry. A Lab-In-Syringe concept was applied for the automation of the microextraction procedure. The procedure involved mixing the sample and natural deep eutectic solvent into a syringe of a flow system, formation and microextraction of colored Schiff base followed by UV-Vis detection. Under optimal automated conditions the limits of detection, calculated from a blank test based on 3s (sigma) were 0.06, 0.1, and 0.06 mg L-1 for sulfapyridine, sulfamethoxazole and sulfamethazine. The proposed automated procedure permitted the routine determination of one drug (sulfamethoxazole, sulfamethazine or sulfapyridine) in urine samples to be achieved in less than 10 min.
Collapse
|
10
|
Comprehensive Assessment of Flow and Other Analytical Methods Dedicated to the Determination of Zinc in Water. Molecules 2021; 26:molecules26133914. [PMID: 34206879 PMCID: PMC8271484 DOI: 10.3390/molecules26133914] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 06/16/2021] [Accepted: 06/24/2021] [Indexed: 02/04/2023] Open
Abstract
An original strategy to evaluate analytical procedures is proposed and applied to verify if the flow-based methods, generally favorable in terms of green chemistry, are competitive when their evaluation also relies on other criteria. To this end, eight methods for the determination of zinc in waters, including four flow-based ones, were compared and the Red–Green–Blue (RGB) model was exploited. This model takes into account several features related to the general quality of an analytical method, namely, its analytical efficiency, compliance with the green analytical chemistry, as well as practical and economic usefulness. Amongst the investigated methods, the best was the flow-based spectrofluorimetric one, and a negative example was that one involving a flow module, ICP ionization and MS detection, which was very good in analytical terms, but worse in relation to other aspects, which significantly limits its overall potential. Good assessments were also noted for non-flow electrochemical methods, which attract attention with a high degree of balance of features and, therefore, high versatility. The original attempt to confront several worldwide accepted analytical strategies, although to some extent subjective and with limitations, provides interesting information and indications, establishing a novel direction towards the development and evaluation of analytical methods.
Collapse
|
11
|
A Review on Green Synthesis, Characterization and Anticancer Application of Metallic Nanoparticles. Appl Biochem Biotechnol 2021; 193:2357-2378. [PMID: 34114200 DOI: 10.1007/s12010-021-03598-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 05/28/2021] [Indexed: 10/21/2022]
Abstract
Cancer is one of the leading causes of death worldwide and also the main obstacle of accelerating anticipation. It is globally recognized as overwhelmingly challenging in terms of clinical management. Cancer is taken into account because a prime lethal disease affects different organs of the body. Even with the rapid improvements in the medical sciences, there are no proper medicines to treat specific kinds of cancer. One of the fundamental issues within the malignant growth treatment is the side effect because of conventional treatment systems. Nanotechnology might be an extremely encouraging field for the therapeutic and drug areas; thus, it assumes a crucial part in improving humankind's satisfaction. In the infield of nanotechnology, a plant-mediated fusion of metal nanoparticles has been developed as a substitute to defeat the limitations of traditional synthesis approaches similar to physical and synthetic strategies. These tunable properties of nanomaterials make them progressed apparatuses in the biomedical platform particularly for the improvement of new diagnostics and focused on therapeutics for malignancy.This review incorporates the characterization of nanoparticles with size and shape and features critical uses of biosynthesized green nanomaterials in cancer theranostics.
Collapse
|
12
|
Automated analytical procedure using multicommuted flow analysis and organic solvent extraction controlled by an Arduino Due board for photometric determination of zinc in water. Microchem J 2021. [DOI: 10.1016/j.microc.2021.105918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
13
|
Lai WH, Hong CY, Tseng HH, Wey MY. Fabrication of waterproof gas separation membrane from plastic waste for CO 2 separation. ENVIRONMENTAL RESEARCH 2021; 195:110760. [PMID: 33493535 DOI: 10.1016/j.envres.2021.110760] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 01/08/2021] [Accepted: 01/13/2021] [Indexed: 06/12/2023]
Abstract
In this study, waste polystyrene (wPS) plastic was used to prepare gas-separation membranes with hot-pressing technology to reduce the accumulation of plastic waste. Polystyrene is a commonly used polymer for the production of plastic products, and it is also used in the synthesis of membranes for gas separation. Compared to the traditional synthesis process, hot-pressing is environmentally friendly because it does not require organic solvents. The mobility of the polymer chain and the integrity and free volume of the membrane are affected by the temperature, pressure, duration, and annealing environment of the hot-pressing process, thereby altering the performance of the membrane. Additionally, when the wPS contained polybutadiene, the gas separation membranes showed a selectivity of 17.14 for CO2/N2. The membranes also exhibited ideal waterproof performance when the membranes were operated under water pressures of 1-5 bar. Therefore, membranes derived from wPS through hot pressing are waterproof and can be used for gas separation. Furthermore, they are expected to maintain their separation performance in complex environments.
Collapse
Affiliation(s)
- Wen-Hsiung Lai
- Department of Environmental Engineering, National Chung Hsing University, Taichung, 402, Taiwan, ROC
| | - Chen-Yao Hong
- Department of Environmental Engineering, National Chung Hsing University, Taichung, 402, Taiwan, ROC
| | - Hui-Hsin Tseng
- School of Occupational Safety and Health, Chung Shan Medical University, Taichung, 402, Taiwan, ROC; Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung, 402, Taiwan, ROC.
| | - Ming-Yen Wey
- Department of Environmental Engineering, National Chung Hsing University, Taichung, 402, Taiwan, ROC.
| |
Collapse
|
14
|
Bisht GS, Dunchu TD, Gnanaprakasam B. Synthesis of Quaternary Spirooxindole 2H-Azirines under Batch and Continuous Flow Condition and Metal Assisted Umpolung Reactivity for the Ring-Opening Reaction. Chem Asian J 2021; 16:656-665. [PMID: 33464707 DOI: 10.1002/asia.202001418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 01/19/2021] [Indexed: 11/06/2022]
Abstract
An efficient and new approach for the synthesis of spirooxindole 2H-azirines via intramolecular oxidative cyclization of 3-(amino(phenyl)methylene)-indolin-2-one derivatives in the presence of I2 and Cs2 CO3 under batch/continuous flow is described. This method is mild and facile to synthesize a variety of spirooxindole 2H-azirines derivatives in gram-scale. Furthermore, we have synthesized spiroaziridine derivatives from spirooxindole 2H-azirines derivatives via addition of Grignard reagent. In addition, we discloses an metal assisted attack of Grignard nucleophile at N-centre rather than C- of the spirooxindole 2H-azirines, which concurrently underwent ring opening of transient aziridines to afford N-substituted Z-3-(aminophenyl)indolin-2-one. A plausible mechanism for azirination and ring-opening reaction is also presented.
Collapse
Affiliation(s)
- Girish Singh Bisht
- Department of Chemistry, Indian Institute of Science Education and Research, 411008, Pune, India
| | - Tenzin Dolkar Dunchu
- Department of Chemistry, Indian Institute of Science Education and Research, 411008, Pune, India
| | - Boopathy Gnanaprakasam
- Department of Chemistry, Indian Institute of Science Education and Research, 411008, Pune, India
| |
Collapse
|
15
|
|
16
|
Somboot W, Jakmunee J, Kanyanee T. Environmentally friendly liquid medium for a cost-effective long-path absorption liquid core waveguide with a gas diffusion flow analysis system. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
17
|
Jin H, Yoon Y, Liles MR, Chua B, Son A. A simple reagent-less approach using electrical discharge as a substitution for chelating agent in addressing genomic assay inhibition by divalent cations. Analyst 2020; 145:6846-6858. [PMID: 33000771 DOI: 10.1039/d0an01666g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Electrical discharge treatment was shown to be a viable substitution for chelating agent in genomic assays. Divalent cation Mg2+ inhibits the performance of DNA hybridization based genomic assays by binding to the DNA and disrupting DNA hybridization. Until now, chelating agents such as ethylenediaminetetraacetic acid (EDTA) was the only option to address the presence of Mg2+ in samples. However, EDTA is a well-known environmental contaminant. In this work, we successfully employed electrical discharge instead of EDTA to render Mg2+ insipid. Its preliminary efficacy was first observed via circular dichroism (CD) and zeta potential analyses. After electrical discharge treatment, the reduction in CD shift at 280 nm was significant for samples with 10-3 and 10-8 M Mg2+. The zeta potential of Mg2+ laden samples were also restored from -4.71 ± 1.38 to -20.59 ± 6.37 mV after electrical discharge treatment. Both CD shift and change in zeta potential suggested that 2 min of electrical discharge treatment could prevent Mg2+ from binding to DNA. The complete efficacy of electrical discharge treatment was demonstrated with the performance recovery (within ∼15% of the control) of a genomic assay variant (NanoGene assay) while analyzing Mg2+ laden samples (10-5-10-3 M). Assuming 10 million samples are analyzed annually, the proposed electrical discharge treatment (∼50 mW per sample) would allow us to trade environmental contamination by ∼50 kg of hazardous EDTA with a single 250 W STC (standard test conditions) solar panel.
Collapse
Affiliation(s)
- Hyowon Jin
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
| | | | | | | | | |
Collapse
|
18
|
Novel approach to determination of Fe(II) using a flow system with direct-injection detector. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02649-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Abstract
This paper presents a novel, automatic, simple approach to stop-flow photometric determination of Fe(II) in wastewater and wine samples using a multi-pumping flow system with a direct-injection detector. The basis for the determination was the reaction of Fe(II) with 1,10-phenanthroline, which was carried out in the reaction chamber of the direct-injection detector. The research included a selection of appropriate parameters of the proposed analytical procedure and method validation. Under optimized conditions, linear calibration curves were obtained in two concentration ranges of Fe(II) 0.07–1.00 and 1.00–7.00 mg/dm3, with the quantification limit of 0.07 mg/dm3. The procedure was validated by studying the accuracy (8.2%, RE) and precision (9.6 and 14.8%, RSD, for higher and lower concentration range, respectively). The proposed method was successfully employed in Fe(II) determination in spiked wastewater and wine samples with recovery of 95.8–104.5%. Using the procedure, time of a single analysis (for three independently measured signals) was about 300 s and sample and reagent consumptions were 240 and 60 mm3, respectively.
Graphic abstract
Collapse
|
19
|
Marques TL, Sasaki MK, Nunes LC, Rocha FRP. Flow-Batch Sample Preparation for Fractionation of the Stress Signaling Phytohormone Salicylic Acid in Fresh Leaves. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2020; 2020:8865849. [PMID: 32724704 PMCID: PMC7382727 DOI: 10.1155/2020/8865849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 07/01/2020] [Indexed: 06/11/2023]
Abstract
Salicylic acid (SA) is an important stress signaling phytohormone and plays an essential role in physiological processes in plants. SA fractionation has been carried out batchwise, which is not compatible with the high analytical demand in agronomical studies and increases susceptibility to analytical errors. In this context, a novel flow-batch sample preparation system for SA fractionation on fresh plant leaves was developed. It was based on microwave-assisted extraction with water and conversion of the conjugated species to free SA by alkaline hydrolysis. Free and total SA were quantified by fluorimetry after separation by sequential injection chromatography in a C18 monolithic column. The proposed procedure is directly applicable to plant leaves containing up 16 mg kg-1 SA, with a limit of detection of 0.1 mg kg-1 of SA, coefficient of variation of 3.0% (n = 10), and sampling rate of 4 samples h-1. The flow-batch sample preparation system was successfully applied to SA fractionation in sugarcane, corn, and soybean leaves without clogging or increasing in backpressure. The proposed approach is simple, less time-consuming, and more environmentally friendly in comparison to batchwise procedures.
Collapse
Affiliation(s)
- Thiago L. Marques
- Center for Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário, 303, 13416-000 Piracicaba, SP, Brazil
| | - Milton K. Sasaki
- Center for Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário, 303, 13416-000 Piracicaba, SP, Brazil
- Federal University of Rio Grande do Sul, Avenida Bento Gonçalves, 91540-000 Porto Alegre, RS, Brazil
| | - Lidiane C. Nunes
- Center for Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário, 303, 13416-000 Piracicaba, SP, Brazil
| | - Fábio R. P. Rocha
- Center for Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário, 303, 13416-000 Piracicaba, SP, Brazil
| |
Collapse
|
20
|
Automated liquid–liquid extraction procedure for the photometric determination of nanogram levels of Hg(II) in soil and sediment extracts. Microchem J 2020. [DOI: 10.1016/j.microc.2020.104978] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
21
|
Mantim T, Chaisiwamongkhol K, Uraisin K, Hauser PC, Wilairat P, Nacapricha D. Dual-Purpose Photometric-Conductivity Detector for Simultaneous and Sequential Measurements in Flow Analysis. Molecules 2020; 25:E2284. [PMID: 32414012 PMCID: PMC7287826 DOI: 10.3390/molecules25102284] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 04/27/2020] [Accepted: 05/07/2020] [Indexed: 01/29/2023] Open
Abstract
This work presents a new dual-purpose detector for photometric and conductivity measurements in flow-based analysis. The photometric detector is a paired emitter-detector diode (PEDD) device, whilst the conductivity detection employs a capacitively coupled contactless conductivity detector (C4D). The flow-through detection cell is a rectangular acrylic block (ca. 2 × 2 × 1.5 cm) with cylindrical channels in Z-configuration. For the PEDD detector, the LED light source and detector are installed inside the acrylic block. The two electrodes of the C4D are silver conducting ink painted on the PEEK inlet and outlet tubing of the Z-flow cell. The dual-purpose detector is coupled with a sequential injection analysis (SIA) system for simultaneous detection of the absorbance of the orange dye and conductivity of the dissolved oral rehydration salt powder. The detector was also used for sequential measurements of creatinine and the conductivity of human urine samples. The creatinine analysis is based on colorimetric detection of the Jaffé reaction using the PEDD detector, and the conductivity of the urine, as measured by the C4D detector, is expressed in millisiemens (mS cm-1).
Collapse
Affiliation(s)
- Thitirat Mantim
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumwit 23 Road, Bangkok 10110, Thailand
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| | - Korbua Chaisiwamongkhol
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
- Center of Chemical Innovation for Sustainability (CIS), Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Kanchana Uraisin
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| | - Peter C. Hauser
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland;
| | - Prapin Wilairat
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- National Doping Control Centre, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| | - Duangjai Nacapricha
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| |
Collapse
|
22
|
Yeerum C, Ayutthaya PIN, Kesonkan K, Chaiyakhan A, Vongboot M. Down-scaling Sample Preparation Using Polyurethane Foam and Colorimetric Technique for the Chromium Assay in Accessories. ANAL SCI 2020; 36:1137-1140. [PMID: 32336727 DOI: 10.2116/analsci.20n003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A simple alternative colorimetric assay of chromium in accessories is proposed. A miniature part of a sample was dissolved by acid digestion. With dithiooxamide (DTO) complexes, metal interferences are retained in polyurethane foam synthesized in the lab, while chromium ions present in the eluate. A 100-μL volume of the eluate was measured for the absorbance using a handy spectrometer. The proposed method was successful for chromium assay and the results obtained agreed with the reference (FAAS) method. The amounts of chromium in accessories were found in the range of 100 to 390 mg g-1.
Collapse
Affiliation(s)
- Chonnipa Yeerum
- Department of Chemistry, Faculty of Sciences, King Mongkut's University of Technology Thonburi
| | | | - Kullapon Kesonkan
- Department of Chemistry, Faculty of Sciences, King Mongkut's University of Technology Thonburi
| | - Apidech Chaiyakhan
- Department of Chemistry, Faculty of Sciences, King Mongkut's University of Technology Thonburi
| | - Monnapat Vongboot
- Department of Chemistry, Faculty of Sciences, King Mongkut's University of Technology Thonburi
| |
Collapse
|
23
|
Automatic On-Line Purge-and-Trap Sequential Injection Analysis for Trace Ammonium Determination in Untreated Estuarine and Seawater Samples. Molecules 2020; 25:molecules25071569. [PMID: 32235335 PMCID: PMC7180869 DOI: 10.3390/molecules25071569] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 03/25/2020] [Accepted: 03/27/2020] [Indexed: 11/22/2022] Open
Abstract
An innovative automatic purge-and-trap (P&T) system coupled with fluorimetric sequential injection (SI), for the on-line separation and preconcentration of volatile compounds, is presented. The truth of concept is demonstrated for the ammonium fluorimetric determination in environmental water samples with complex matrices without any pretreatment. The P&T flow system comprises a thermostated purge-vessel where ammonium is converted into gaseous ammonia and a trap-vessel for ammonia collection. This configuration results in matrix removal as well as analyte preconcentration, avoiding membrane-associated problems. All the main parameters affecting the efficiency of a P&T system were studied and optimized. The proposed method is characterized by a working range of 2.7–150.0 μg L−1 of NH4+, with a detection and quantification limit of 0.80 and 2.66 μg L−1, respectively, for a 10-mL sample consumption. The accuracy of the method was assessed by recovery assays in seawater, estuarine, and lake water samples as well as by the analysis of standard reference material.
Collapse
|
24
|
Marinho OR, Lima MJA, Reis BF. Automatic multicommuted flow-batch setup for photometric determination of mercury in drinking water at ppb level. Talanta 2020; 206:120207. [PMID: 31514857 DOI: 10.1016/j.talanta.2019.120207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 11/24/2022]
Abstract
Herein, a multicommuted flow-batch setup and a photometric procedure for the determination of mercury at the ppb level in aqueous samples are described. The setup was designed to implement a versatile solvent extraction and pre-concentration strategy by combining flow-batch and multicommuted flow analysis approaches. The photometric method was based on Hg(II) reaction with dithizone in a chloroform medium, which was also used as the extracting organic solvent. The flow analysis system was composed of a homemade syringe pump module, a set of solenoid valves, two Aquarius mini-pumps, and a flow-batch chamber. The homemade photometer was comprised of a light emitting diode (LED), photodiode, and homemade flow cell (50 mm length). The flow system and photometer were controlled using an Arduino Due board, running custom-written software. After optimizing the operational conditions, the effectiveness of the developed system was evaluated for the determination of the mercury concentration in drinking water. For accuracy assessment, samples were analyzed using a spiking methodology and an independent method, yielding a recovery ranging from 92% to 108%. Other important characteristics of the proposed method were found as follows: linear response range, 0.5-10.0 μg L-1 (r = 0.9984); limit of detection 0.38 μg L-1 Hg(II); consumption of dithizone and chloroform, 1.85 μg L-1 and 0.8 mL per analysis, respectively; coefficient of variation, 2% (n = 10); sampling throughput, 20 determinations per h.
Collapse
Affiliation(s)
- Oziel R Marinho
- Department of Chemistry, Federal University of São Carlos, São Carlos, SP, 13560-970, Brazil; Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, 13416-000, Brazil.
| | - Manoel J A Lima
- Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, 13416-000, Brazil.
| | - Boaventura F Reis
- Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, 13416-000, Brazil.
| |
Collapse
|
25
|
Rocha FR, Zagatto EA. Flow analysis during the 60 years of Talanta. Talanta 2020; 206:120185. [DOI: 10.1016/j.talanta.2019.120185] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 07/26/2019] [Accepted: 07/27/2019] [Indexed: 01/01/2023]
|
26
|
Zagatto EA, Rocha FR. The multiple facets of flow analysis. A tutorial. Anal Chim Acta 2020; 1093:75-85. [DOI: 10.1016/j.aca.2019.09.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 09/03/2019] [Accepted: 09/09/2019] [Indexed: 12/16/2022]
|
27
|
Abstract
Background:
Green chemistry is the application of methodologies and techniques to reduce
the use of hazardous substances, minimize waste generation and apply benign and cheap applications.
Methods:
In this article, the following issues were considered: greener solvents and reagents, miniaturization
of analytical instrumentation, reagent-free methodologies, greening with automation, greener
sample preparation methods, and greener detection systems. Moreover, the tables along with the investigated
topics including environmental analysis were included. The future aspects and the challenges
in green analytical chemistry were also discussed.
Results:
The prevention of waste generation, atomic economy, use of less hazardous materials for
chemical synthesis and design, use of safer solvents, auxiliaries and renewable raw materials, reduction
of unnecessary derivatization, design degradation products, prevention of accidents and development
of real-time analytical methods are important for the development of greener methodologies.
Conclusion:
Efforts should also be given for the evaluation of novel solid phases, new solvents, and
sustainable reagents to reduce the risks associated with the environment. Moreover, greener methodologies
enable energy efficient, safe and faster that reduce the use of reagents, solvents and preservatives
which are hazardous to both environment and human health.
Collapse
Affiliation(s)
| | - Onur Yayayürük
- Department of Chemistry, Faculty of Science, Ege University, İzmir, Turkey
| |
Collapse
|
28
|
Marques TL, Nóbrega JA, Rocha FR. Flow-based solid sample preparation: Advantages, limitations, and challenges. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
29
|
Wei X, Hao Y, Huang X, Hu Y, Xiong B. Automated solid phase extraction and electrospray chip based on programmatic pneumatic micro-valves. Talanta 2019; 198:404-411. [DOI: 10.1016/j.talanta.2019.01.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 01/22/2019] [Accepted: 01/24/2019] [Indexed: 12/28/2022]
|
30
|
Highly sensitive procedure for determination of Cu(II) by GF AAS using single-drop microextraction. Microchem J 2019. [DOI: 10.1016/j.microc.2019.04.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
31
|
Néri-Quiroz J, Canto F, Guillerme L, Couston L, Magnaldo A, Dugas V. Microfluidic ballistic regime for the generation of linear gradients inside a capillary column: Proof-of-concept and application to the miniaturized acid-base volumetric titration. Talanta 2019; 196:237-242. [PMID: 30683358 DOI: 10.1016/j.talanta.2018.12.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/11/2018] [Accepted: 12/14/2018] [Indexed: 10/27/2022]
Abstract
This work details a simple and original approach for the generation of linear gradients inside straight cylindrical microchannels such as a capillary column. The concept takes advantage of an oft-overlooked regime of dispersion of flowing liquids inside narrow channels: the ballistic regime. The ballistic regime is a pure convective regime and is produced by imposing a high velocity flow in a pre-filled capillary thus limited diffusion takes place. This is obtained by forcing the injection of a plug of solution on a short time scale t, much shorter than t<110×D/r2, D is the diffusion coefficient and r the capillary radius. The result is a stretched solution of a given length or depth of penetration, inside the capillary column. This leads to a linear mean concentration field through the mixing zone forming a linear gradient. In miniaturized systems, this transient regime is followed by mainly radial diffusion of the solution inside the capillary due to the short characteristic diffusion time of narrow channels. A convection-diffusion simulation was used to model the gradient formed under this ballistic regime. A specific experimental prototype set-up was designed to investigate this ballistic regime and the formation of a linear gradient of titrant NaOH solution inside a capillary tubing of 500 µm inner diameter and 35-cm total length pre-filled with nitric acid solution. With this prototype, the linear gradient was then pushed in a non-ballistic regime over a confocal fluorescence point detection system in order to measure the fluorescence emission of a fluorescent dye added to the solutions. Considering strong acid-base reaction, fluorescein was used due to its strong fluorescence dependency with pH near its pKa, i.e 6.4. A first set of experiments was realized to demonstrate the validity of such an approach and to determine the optimal condition for the formation of a linear gradient over 300 mm of the 350-mm capillary length. An injection pressure of 1000-mbars over 0.75 s was chosen. The first result was the stability of the system in its ability to produce reproducible linear gradients. As further proofs of feasibility, samples of different nitric acid concentrations were titrated with a 0.25 M NaOH solution. The result was rapid and reproducible titration curves obtained with a fully automated system that consumes less than approximately 70 µL of sample solution.
Collapse
Affiliation(s)
- José Néri-Quiroz
- CEA Nuclear Energy Division, Research Department on Mining and Fuel Recycling Processes, Marcoule, F-30207 Bagnols-sur-Cèze, France; Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université Lyon 1 - 5, rue de la Doua, F-69100 Villeurbanne, France
| | - Fabrice Canto
- CEA Nuclear Energy Division, Research Department on Mining and Fuel Recycling Processes, Marcoule, F-30207 Bagnols-sur-Cèze, France
| | - Laurent Guillerme
- CEA Nuclear Energy Division, Research Department on Mining and Fuel Recycling Processes, Marcoule, F-30207 Bagnols-sur-Cèze, France
| | - Laurent Couston
- CEA Nuclear Energy Division, Research Department on Mining and Fuel Recycling Processes, Marcoule, F-30207 Bagnols-sur-Cèze, France
| | - Alastair Magnaldo
- CEA Nuclear Energy Division, Research Department on Mining and Fuel Recycling Processes, Marcoule, F-30207 Bagnols-sur-Cèze, France
| | - Vincent Dugas
- Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université Lyon 1 - 5, rue de la Doua, F-69100 Villeurbanne, France.
| |
Collapse
|
32
|
Sensitive Photochemically Induced Fluorescence Sensor for the Determination of Nitenpyram and Pyraclostrobin in Grapes and Wines. FOOD ANAL METHOD 2019. [DOI: 10.1007/s12161-019-01451-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
33
|
Mendonça DMH, Rocha DP, Dutra GSV, Cardoso RM, Batista AD, Richter EM, Munoz RAA. 3D‐printed Portable Platform for Mechanized Handling and Injection of Microvolumes Coupled to Electrochemical Detection. ELECTROANAL 2019. [DOI: 10.1002/elan.201800834] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | - Diego P. Rocha
- Federal University of UberlandiaInstitute of Chemistry 38400-902 Uberlandia, MG Brazil
| | - Gustavo S. V. Dutra
- Federal University of UberlandiaInstitute of Chemistry 38400-902 Uberlandia, MG Brazil
| | - Rafael M. Cardoso
- Federal University of UberlandiaInstitute of Chemistry 38400-902 Uberlandia, MG Brazil
| | - Alex D. Batista
- Federal University of UberlandiaInstitute of Chemistry 38400-902 Uberlandia, MG Brazil
| | - Eduardo M. Richter
- Federal University of UberlandiaInstitute of Chemistry 38400-902 Uberlandia, MG Brazil
| | - Rodrigo A. A. Munoz
- Federal University of UberlandiaInstitute of Chemistry 38400-902 Uberlandia, MG Brazil
| |
Collapse
|
34
|
Delgado-Blanca I, Ruiz-Medina A, Ortega-Barrales P. Novel sequential separation and determination of a quaternary mixture of fungicides by using an automatic fluorimetric optosensor. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2019; 36:278-288. [PMID: 30650038 DOI: 10.1080/19440049.2018.1564372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A versatile flow-through multi-optosensor is proposed for the separation and spectrofluorimetric determination of mixtures of four widely used pesticides: carbendazim, thiabendazole, carbaryl and o-phenylphenol at µg g-1 levels in fruits. The flow system is based on the online pre-concentration and separation of the pesticides on a solid sensing microzone, followed by the sequential measurement of their native fluorescence. The separation of the pesticides takes place on a solid support located in the same flow cell, on which analytes are temporarily immobilized and separated from the matrix due to their different retention/desorption kinetics when they interact with the C18 silica gel microbeads. Suitable analytical parameters were obtained for the selected analytes, with method detection and quantification limits ranging between 0.1-0.5 and 0.2-1.6 µg g-1, respectively. These values comply with the maximum residue limits (MRLs) established by the Codex Alimentarius for these commodities; in addition, carbendazim, thiabendazole and ortho-phenylphenol comply with the MRLs of The European Union. The developed method was applied to the analysis of citrus fruits by performing recovery studies. Recoveries between 85% and 115% were obtained in all cases, and the results were confirmed by a liquid chromatography-mass spectrometry reference method.
Collapse
Affiliation(s)
- I Delgado-Blanca
- a Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences , University of Jaén , Jaén , Spain
| | - A Ruiz-Medina
- a Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences , University of Jaén , Jaén , Spain
| | - P Ortega-Barrales
- a Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences , University of Jaén , Jaén , Spain
| |
Collapse
|
35
|
GAMA MARIANAR, MELCHERT WANESSAR, PAIXÃO THIAGOR, ROCHA FÁBIOR. An overview of the Brazilian contributions to Green Analytical Chemistry. ACTA ACUST UNITED AC 2019; 91:e20180294. [DOI: 10.1590/0001-3765201920180294] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 04/17/2018] [Indexed: 12/11/2022]
|
36
|
Kurbanoglu S, Unal MA, Ozkan SA. Recent developments on electrochemical flow injection in pharmaceuticals and biologically important compounds. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.04.217] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
37
|
Dias TR, Melchert WR, Kamogawa MY, Rocha FR, Zagatto EA. Fluidized particles in flow analysis: potentialities, limitations and applications. Talanta 2018; 184:325-331. [DOI: 10.1016/j.talanta.2018.02.072] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 02/09/2018] [Accepted: 02/15/2018] [Indexed: 12/18/2022]
|
38
|
Domínguez-Romero JC, Gilbert-López B, Beneito-Cambra M, Molina-Díaz A. Renewable chemiluminescence optosensors based on implementation of bead injection principle with multicommutation. Talanta 2018; 182:267-272. [PMID: 29501151 DOI: 10.1016/j.talanta.2018.01.091] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 01/24/2018] [Accepted: 01/30/2018] [Indexed: 10/18/2022]
Abstract
In this work, the implementation of Bead Injection with multicommutation-based flow systems is reported. A surface renewable chemiluminescence (CL) flow sensor is presented based on the use of CL reaction of luminol with H2O2. Dowex 1 × 8 beads with immobilized luminol onto them were injected in the flow system by means of a six-port rotary valve and were accommodated into a 1 mm optical glass flow cell placed just in front of the rectangular photosensor window with the same size than the cell wall. Automatic computer-controlled manipulation of both reagents and sample solutions was undertaken using a multicommutated flow system which comprises five three-way solenoid valves, a home-made electronic interface and a Java-written software. Once the chemiluminescence signal was registered, sensing beads were automatically discarded out with a six-port rotary valve without needing to reverse or stop the flow. As a proof of concept and example, the enhancement of the chemiluminescence signal produced by Co(II) on the luminol-H2O2 reaction in alkaline medium was used for illustrating this implementation determining vitamin B12 in pharmaceutical preparations (after mineralization for releasing Co(II)). The analytical performance of the approach was satisfactory, showing a linear dynamic range from 1.7 to 50 µg L-1, a detection limit of 0.5 µg L-1, RSD (%) of 5.3%, with a sampling frequency of 11 h-1. The proposed approach was applied to different samples and the results were consistent with those obtained with a reference method based on ICP-MS. Based on the same reaction (or re-configuring the system to accommodate it to reaction requirements) the approach can also be applied to the determination of other metal ions such as Cr(III) and Fe(II) and appropriately extended to molecules of bioanalytical interest based e.g. in CL immunoassays, given its versatility.
Collapse
Affiliation(s)
- Juan C Domínguez-Romero
- Analytical Chemistry Research Group, Department of Physical and Analytical Chemistry, University of Jaén, E-23071 Jaén, Spain
| | - Bienvenida Gilbert-López
- Analytical Chemistry Research Group, Department of Physical and Analytical Chemistry, University of Jaén, E-23071 Jaén, Spain
| | - Miriam Beneito-Cambra
- Analytical Chemistry Research Group, Department of Physical and Analytical Chemistry, University of Jaén, E-23071 Jaén, Spain
| | - Antonio Molina-Díaz
- Analytical Chemistry Research Group, Department of Physical and Analytical Chemistry, University of Jaén, E-23071 Jaén, Spain.
| |
Collapse
|
39
|
Kuznetsov VV. Flow injection analysis: An approach via linear non-equilibrium thermodynamics. Talanta 2018; 187:237-245. [PMID: 29853041 DOI: 10.1016/j.talanta.2018.04.048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 03/17/2018] [Accepted: 04/16/2018] [Indexed: 11/26/2022]
Abstract
A novel approach to flow injection analysis (FIA) was proposed based on the main principles of linear non-equilibrium thermodynamics (LNET). The basic principles of I. Prigogine theory for dissipative structures, internal entropy production rates, thermodynamic forces and fluxes arising in flow systems were shown to be applicable to FIA. The practical application of this novel FIA approach allowed the use of the extent of analytical reaction and the entropy production rates for flow system optimization, and in-depth understanding of the steady state. The FIA approach was also found to be a suitable technique for and characterizes its quality, explaining the peculiarities of short-term and long-term steady states in a FIA system and their role for reproducibility of practical measurements. The practical application o the FIA approach was found to support its theoretical principles and allow formulating an original manner to derive a basic equation in FIA theory.
Collapse
Affiliation(s)
- Vladimir V Kuznetsov
- Department of Analytical Chemistry, Mendeleev University of Chemical Technology of Russia, 125047, Russia.
| |
Collapse
|
40
|
Kiwfo K, Wongwilai W, Paengnakorn P, Boonmapa S, Sateanchok S, Grudpan K. Noodle based analytical devices for cost effective green chemical analysis. Talanta 2018; 181:1-5. [PMID: 29426486 DOI: 10.1016/j.talanta.2017.12.056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 12/16/2017] [Accepted: 12/18/2017] [Indexed: 11/29/2022]
Abstract
Noodle based analytical devices are proposed for cost effective green chemical analysis. Two noodle based analytical platforms have been examined. Conditions for flow with laminar behaviors could be established. Detection may be via a webcam camera or a flatbed scanner. Acid-base reactions were chosen as a model study. The assays of acetic acid and sodium hydroxide were investigated. Apart from bromothymol blue, simple aqueous extract of butterfly pea flower was used as a natural reagent. Another model was the assay of copper (Cu2+) which was based on the redox reaction of copper (Cu2+) with iodide to produce tri-iodide forming brown/black product with starch which already exists in the noodle platform. Demonstration to apply the noodle platforms for real samples was made.
Collapse
Affiliation(s)
- Kanokwan Kiwfo
- Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Chemistry and, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Graduate program in Chemistry, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wasin Wongwilai
- Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand; Science and Technology Research Institute, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Pathinan Paengnakorn
- Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Sasithorn Boonmapa
- Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Chemistry and, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Graduate program in Chemistry, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Suphasinee Sateanchok
- Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Chemistry and, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Graduate program in Chemistry, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Kate Grudpan
- Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Chemistry and, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Science and Technology Research Institute, Chiang Mai University, Chiang Mai 50200, Thailand
| |
Collapse
|
41
|
Multicommuted Flow Injection Analysis Using Chemiluminescence Detection (MCFIA-CL) for Olive Oil Analysis. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1182-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
42
|
Godeffroy L, Chau F, Buriez O, Labbé E. Fast and complete electrochemical conversion of solutes contained in micro-volume water droplets. Electrochem commun 2018. [DOI: 10.1016/j.elecom.2017.12.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
43
|
Li T, Panther J, Qiu Y, Liu C, Huang J, Wu Y, Wong PK, An T, Zhang S, Zhao H. Gas-Permeable Membrane-Based Conductivity Probe Capable of In Situ Real-Time Monitoring of Ammonia in Aquatic Environments. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:13265-13273. [PMID: 29067813 DOI: 10.1021/acs.est.7b03552] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Aquatic ammonia has toxic effects on aquatic life. This work reports a gas-permeable membrane-based conductivity probe (GPMCP) developed for real-time monitoring of ammonia in aquatic environments. The GPMCP innovatively combines a gas-permeable membrane with a boric acid receiving phase to selectively extract ammonia from samples and form ammonium at the inner membrane interface. The rate of the receiving phase conductivity increase is directly proportional to the instantaneous ammonia concentration in the sample, which can be rapidly and sensitively determined by the embedded conductivity detector. A precalibration strategy was developed to eliminate the need for an ongoing calibration. The analytical principle and GPMCP performance were systematically validated. The laboratory results showed that ammonia concentrations ranging from 2 to 50 000 μg L-1 can be detected. The field deployment results demonstrated the GPMCP's ability to obtain high-resolution continuous ammonia concentration profiles and the absolute average ammonia concentration over a prolonged deployment period. By inputting the temperature and pH data, the ammonium concentration can be simultaneously derived from the corresponding ammonia concentration. The GPMCP embeds a sophisticated analytical principle with the inherent advantages of high selectivity, sensitivity, and accuracy, and it can be used as an effective tool for long-term, large-scale, aquatic-environment assessments.
Collapse
Affiliation(s)
- Tianling Li
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
| | - Jared Panther
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
- Goulburn-Murray Water , Tatura, VIC 3616, Australia
| | - Yuan Qiu
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
- Guangxi Vocational and Technical Institute of Industry , 37 Xiuling Road, Nanning, Guangxi 530005, China
| | - Chang Liu
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
- Department of Chemistry, Liaoning Medical University , 40 Songpo Road, Jinzhou, Liaoning 121001, China
| | - Jianyin Huang
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
- Division of Information Technology, Engineering and Environment, School of Natural and Built Environment, Mason Lakes Campus, University of South Australia , Adelaide, SA 5095, Australia
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences , 71 East Beijing Road, Nanjing, Jiangsu 210008, China
| | - Po Keung Wong
- School of Life Sciences, The Chinese University of Hong Kong , Shatin, NT, Hong Kong SAR, China
| | - Taicheng An
- Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology , Guangzhou, 510006, China
| | - Shanqing Zhang
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
| | - Huijun Zhao
- Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University , Southport, QLD 4222, Australia
| |
Collapse
|
44
|
Rocha DP, Anjos GTC, Neri TS, Tronto J, Pinto FG, Silva SG, Coelho NMM. A flow injection procedure using Layered Double Hydroxide for on line pre-concentration of fluoride. Talanta 2017; 178:102-108. [PMID: 29136791 DOI: 10.1016/j.talanta.2017.09.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Revised: 09/03/2017] [Accepted: 09/06/2017] [Indexed: 10/18/2022]
Abstract
This work showed a flow system designed with solenoid valves for preconcentration of fluoride using SPADNS method in water samples. The analyte was preconcentrated in a mini-column coated with Layered Double Hydroxides (LDH) used as adsorbent. Then, the fluoride ions were eluted with 0.5molL-1 sodium hydroxide and determined by spectrophotometry. The variables that affect the system such adsorbent mass, type of eluent, solutions flow rate, reagent concentration and pH effect were critically evaluated. Under optimized conditions, the detection limit, coefficient of variation, linear range and preconcentration factor were estimated at 15µgL-1 (99.7% confidence level), 0.8% (500µgL-1, n = 10), 50-500µgL-1 and 10, respectively. The accuracy of the method was evaluated by analysis of ALPHA APS 1076 (Simulated Rain Water) certified material, the values were not significantly different at a 95% level of confidence. The method was applied for fluoride determination in water samples and the levels found were below the maximum values established by Brazilian environmental and health legislations.
Collapse
Affiliation(s)
- Diego P Rocha
- Federal University of Uberlândia, Institute of Chemistry, Avenue João Naves de Ávila, 2121, Santa Mônica, Uberlândia, MG CEP 38400-902, Brazil
| | - Gabriel T C Anjos
- Federal University of Uberlândia, Institute of Chemistry, Avenue João Naves de Ávila, 2121, Santa Mônica, Uberlândia, MG CEP 38400-902, Brazil
| | - Thais S Neri
- Federal University of Uberlândia, Institute of Chemistry, Avenue João Naves de Ávila, 2121, Santa Mônica, Uberlândia, MG CEP 38400-902, Brazil
| | - Jairo Tronto
- Federal University of Viçosa, Campus de Rio Paranaíba, Institute of Exact and Technological Sciences, Rodovia MG-230 - Km 8, Rio Paranaíba, MG CEP 38810-000, Brazil
| | - Frederico G Pinto
- Federal University of Viçosa, Campus de Rio Paranaíba, Institute of Exact and Technological Sciences, Rodovia MG-230 - Km 8, Rio Paranaíba, MG CEP 38810-000, Brazil
| | - Sidnei G Silva
- Federal University of Uberlândia, Institute of Chemistry, Avenue João Naves de Ávila, 2121, Santa Mônica, Uberlândia, MG CEP 38400-902, Brazil
| | - Nívia M M Coelho
- Federal University of Uberlândia, Institute of Chemistry, Avenue João Naves de Ávila, 2121, Santa Mônica, Uberlândia, MG CEP 38400-902, Brazil.
| |
Collapse
|
45
|
da Silva Magalhães T, Reis BF. A Sensitive Photometric Procedure for Cobalt Determination in Water Employing a Compact Multicommuted Flow Analysis System. APPLIED SPECTROSCOPY 2017; 71:2154-2163. [PMID: 28593792 DOI: 10.1177/0003702817713749] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work, a multicommuted flow analysis procedure is proposed for the spectrophotometric determination of cobalt in fresh water, employing an instrument setup of downsized dimension and improved cost-effectiveness. The method is based on the catalytic effect of Co(II) on the Tiron oxidation by hydrogen peroxide in alkaline medium, forming a complex that absorbs radiation at 425 nm. The photometric detection was accomplished using a homemade light-emitting-diode (LED)-based photometer designed to use a flow cell with an optical path-length of 100 mm to improve sensitivity. After selecting adequate values for the flow system variables, adherence to the Beer-Lambert-Bouguer law was observed for standard solution concentrations in the range of 0.13-1.5 µg L-1 Co(II). Other useful features including a relative standard deviation of 2.0% (n = 11) for a sample with 0.49 µg L-1 Co(II), a detection limit of 0.06 µg L-1 Co(II) (n = 20), an analytical frequency of 42 sample determinations per hour, and waste generation of 1.5 mL per determination were achieved.
Collapse
Affiliation(s)
| | - Boaventura F Reis
- 2 Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba, SP, Brasil
| |
Collapse
|
46
|
A cost-effective assay for antioxidant using simple cotton thread combining paper based device with mobile phone detection. Talanta 2017; 177:171-175. [PMID: 29108572 DOI: 10.1016/j.talanta.2017.08.073] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 08/20/2017] [Accepted: 08/23/2017] [Indexed: 11/22/2022]
Abstract
A cost-effective assay for antioxidant using simple cotton thread combining paper based device with mobile phone detection has been investigated. Standard and sample solutions flow along a bunch of cotton thread treated with sodium hydroxide via microfluidic behaviors without external pumping. The analyte solution reacts with the reagents that have been immobilized on the paper strip fixed at the end of the cotton bunch. The developed platforms were used for the assays of total phenolic content and antioxidant capacity by employing Folin-Ciocalteu and 2, 2-diphenyl-1-picryhydrazyl (DPPH) respectively. Simple detection can be made by employing a mobile phone camera (iPhone 4S) with Image J or Photoshop for image processing and evaluation. Gallic acid was used as a reference standard in this work, as its polyphenol structures can be found in many plants. The total phenolic content is expressed as gallic acid equivalents (GAE) (mg/g material). Inhibition capacity is calculated by the equation: % I = [(Io - Is)/ Io] × 100, where Is is the relative magenta intensity (CMYK mode) of sample, and Io the relative magenta intensity of DPPH•. IC50 inhibition can be estimated from the graph and can be used for the antioxidant capacity consideration. Applications to the assay green tea samples were demonstrated. The total phenolic contents in the green tea samples were found to be 48-105mg/g, with %RSD of less than 10 for that of higher 50 GAE mg/g and IC50 values of the samples studied were 25-50mg/L. The results obtained by the developed methods agree with that of the standard methods.
Collapse
|
47
|
Murugesan S, Iyyaswami R. Low frequency sonic waves assisted cloud point extraction of polyhydroxyalkanoate from Cupriavidus necator. J Chromatogr B Analyt Technol Biomed Life Sci 2017. [DOI: 10.1016/j.jchromb.2017.06.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
48
|
Silva AR, Kamogawa MY, Melchert WR. A versatile and greener multicommuted flow-based system for exploiting relatively slow chemical reactions. Microchem J 2017. [DOI: 10.1016/j.microc.2017.03.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
49
|
Santos FG, Reis BF. A Highly Sensitive Multicommuted Flow Analysis Procedure for Photometric Determination of Molybdenum in Plant Materials without a Solvent Extraction Step. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2017; 2017:9361460. [PMID: 28357152 PMCID: PMC5357548 DOI: 10.1155/2017/9361460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/15/2017] [Indexed: 06/06/2023]
Abstract
A highly sensitive analytical procedure for photometric determination of molybdenum in plant materials was developed and validated. This procedure is based on the reaction of Mo(V) with thiocyanate ions (SCN-) in acidic medium to form a compound that can be monitored at 474 nm and was implemented employing a multicommuted flow analysis setup. Photometric detection was performed using an LED-based photometer coupled to a flow cell with a long optical path length (200 mm) to achieve high sensitivity, allowing Mo(V) determination at a level of μg L-1 without the use of an organic solvent extraction step. After optimization of operational conditions, samples of digested plant materials were analyzed employing the proposed procedure. The accuracy was assessed by comparing the obtained results with those of a reference method, with an agreement observed at 95% confidence level. In addition, a detection limit of 9.1 μg L-1, a linear response (r = 0.9969) over the concentration range of 50-500 μg L-1, generation of only 3.75 mL of waste per determination, and a sampling rate of 51 determinations per hour were achieved.
Collapse
Affiliation(s)
- Felisberto G. Santos
- Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Av. Centenário, 303 São Dimas, 13400 970 Piracicaba, SP, Brazil
| | - Boaventura F. Reis
- Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Av. Centenário, 303 São Dimas, 13400 970 Piracicaba, SP, Brazil
| |
Collapse
|
50
|
Lima MJ, Reis BF. A clean photometric method for the determination of losartan potassium in pharmaceuticals exploiting light scattering effect and employing a multicommuted flow analysis approach. Talanta 2017; 164:183-188. [DOI: 10.1016/j.talanta.2016.11.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/04/2016] [Accepted: 11/05/2016] [Indexed: 10/20/2022]
|