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Boulgakov AA, Moor SR, Jo HH, Metola P, Joyce LA, Marcotte EM, Welch CJ, Anslyn EV. Next-Generation TLC: A Quantitative Platform for Parallel Spotting and Imaging. J Org Chem 2020; 85:9447-9453. [PMID: 32559382 DOI: 10.1021/acs.joc.0c00349] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A high-throughput screening approach for simultaneous analysis and quantification of the percent conversion of up to 48 reactions has been developed using a thin-layer chromatography (TLC) imaging method. As a test-bed reaction, we monitored 48 thiol conjugate additions to a Meldrum's acid derivative (1) in parallel using TLC. The TLC elutions were imaged using a cell phone and a LEGO brick-constructed UV/vis light box. Further, a spotting device was constructed from LEGO bricks that allows simple transfer of the samples from a well-plate to the TLC plate. Using software that was developed to detect "blobs" and report their intensity, we were able to quantitatively determine the extent of completion of the 48 reactions with one analysis.
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Affiliation(s)
- Alexander A Boulgakov
- Center for Systems and Synthetic Biology/Institute for Cellular and Molecular Biology, Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Sarah R Moor
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Hyun Hwa Jo
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Pedro Metola
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Leo A Joyce
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Edward M Marcotte
- Center for Systems and Synthetic Biology/Institute for Cellular and Molecular Biology, Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Christopher J Welch
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Eric V Anslyn
- Center for Systems and Synthetic Biology/Institute for Cellular and Molecular Biology, Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
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Solana-Altabella A, Sánchez-Iranzo M, Bueso-Bordils J, Lahuerta-Zamora L, Mellado-Romero A. Computer vision-based analytical chemistry applied to determining iron in commercial pharmaceutical formulations. Talanta 2018; 188:349-355. [DOI: 10.1016/j.talanta.2018.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/30/2018] [Accepted: 06/01/2018] [Indexed: 12/22/2022]
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3
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Bernard-Savary P, Poole CF. Instrument platforms for thin-layer chromatography. J Chromatogr A 2015; 1421:184-202. [DOI: 10.1016/j.chroma.2015.08.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 07/25/2015] [Accepted: 08/03/2015] [Indexed: 10/23/2022]
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Morlock GE. Miniaturized planar chromatography using office peripherals--office chromatography. J Chromatogr A 2014; 1382:87-96. [PMID: 25442326 DOI: 10.1016/j.chroma.2014.09.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 09/18/2014] [Accepted: 09/19/2014] [Indexed: 11/26/2022]
Abstract
Office chromatography (OC) harnesses the novel combination of miniaturized planar separation science and modern print & media technologies. Interdisciplinary knowledge is the essence: Printing of solutions on powerful miniaturized planar separation materials in combination with image capturing and evaluation tools enables an innovative analytical online system. Site-specific printing as lines or areas on defined sections of the layer comprises important steps like application of samples, feeding of the mobile phase as well as supply of the derivatization reagent. Also printing of bioassays can be combined for effect-directed detections and the homogeneous printing of the ultrathin layer itself, enabling tailor-made gradient-layer or multi-layer plates. OC exploits image-giving miniaturized chromatograms being captured and processed with a flatbed scanner or mini-camera. Thus, miniaturized separation materials are the core of OC. Monolithic, electrospun, nanostructured glancing angle deposition and carbon nanotube-templated microfabricated layers or even pillar arrays or polymer brush coated sub-μm silica particles were demonstrated, showing promising results. Layer thicknesses from 50 μm down to few micrometers were explored. A high-throughput capacity is given through the parallel development of as many as possible tiny-printed samples on the separation material. The migration time was reduced to a few minutes and the calculated analysis time per sample lasted few seconds. Considering a substantially reduced solvent consumption at short run times for parallel analysis of numerous samples at the same time, OC is an appropriate analytical technique for green chemistry. OC facilitates the whole planar separation process to be performed with no other equipment but a combined device of printer and flatbed scanner or mini-camera. At the same time, OC can be expected to become a widespread and economical technique with the user-friendliness of high-end office tools, appealing to users.
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Affiliation(s)
- Gertrud E Morlock
- Food Science, Justus Liebig University Giessen, Interdisciplinary Research Centre (IFZ) and Institute of Nutritional Science, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany.
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5
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LIU J, GONG Z. Determination of four Sudan dyes in chili oil by high performance liquid chromatography with on-line photochemical derivatization and fluorescence detection. Se Pu 2013; 30:624-9. [DOI: 10.3724/sp.j.1123.2012.01015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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6
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Zhang DS, Liu W, Li YP, Hu CQ. Establishment and optimization of an HPTLC method for the analysis of gatifloxacin and related substances by design of experiment. JPC-J PLANAR CHROMAT 2013. [DOI: 10.1556/jpc.26.2013.3.3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hoeltz M, Monezzi LP, Manfroi V, Noll IB, Dottori HA. Ocratoxina A: análise da qualidade de vinhos brasileiros e importados. BRAZILIAN JOURNAL OF FOOD TECHNOLOGY 2012. [DOI: 10.1590/s1981-67232012005000039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Estudos em diferentes partes do mundo mostraram que o vinho pode conter Ocratoxina A, uma micotoxina com propriedades nefrotóxicas e carcinogênicas. O objetivo deste trabalho foi avaliar a presença de Ocratoxina A em vinhos brasileiros e importados, utilizando-se a técnica de cromatografia em camada delgada com detector de carga acoplada. Foram analisadas 63 amostras de vinhos tintos brasileiros, argentinos, uruguaios e chilenos. O método se mostrou suficientemente sensível para análise da micotoxina em vinho, com recuperação de 99%. Os limites de detecção e quantificação foram 0,2 e 0,4 µg.L- 1, respectivamente. Não foi constatada a presença de Ocratoxina A em nenhuma das 63 amostras analisadas. A baixa ocorrência dessa micotoxina registrada neste estudo está de acordo com trabalhos semelhantes já realizados e contribui, de certa forma, para a comprovada qualidade do vinho, produzido principalmente no sul do Brasil, além de garantir a saúde da população consumidora desses produtos.
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Oko A, Jim S, Taschuk M, Brett M. Time resolved chromatograms in ultra-thin layer chromatography. J Chromatogr A 2012; 1249:226-32. [DOI: 10.1016/j.chroma.2012.05.090] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Revised: 05/23/2012] [Accepted: 05/24/2012] [Indexed: 11/17/2022]
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Lahuerta Zamora L, Pérez-Gracia MT. Using digital photography to implement the McFarland method. J R Soc Interface 2012; 9:1892-7. [PMID: 22337631 DOI: 10.1098/rsif.2011.0809] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The McFarland method allows the concentration of bacterial cells in a liquid medium to be determined by either of two instrumental techniques: turbidimetry or nephelometry. The microbes act by absorbing and scattering incident light, so the absorbance (turbidimetry) or light intensity (nephelometry) measured is directly proportional to their concentration in the medium. In this work, we developed a new analytical imaging method for determining the concentration of bacterial cells in liquid media. Digital images of a series of McFarland standards are used to assign turbidity-based colour values with the aid of dedicated software. Such values are proportional to bacterial concentrations, which allow a calibration curve to be readily constructed. This paper assesses the calibration reproducibility of an intra-laboratory study and compares the turbidimetric and nephelometric results with those provided by the proposed method, which is relatively simple and affordable; in fact, it can be implemented with a digital camera and the public domain software ImageJ.
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Affiliation(s)
- L Lahuerta Zamora
- Departamento de Química, Bioquímica y Biología Molecular, Facultad de Ciencias de la Salud, Universidad CEU Cardenal Herrera, 46113 Moncada, Spain.
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Zamora LL, Mellado Romero AM, Calatayud JM. Quantitative Colorimetric Analysis of Some Inorganic Salts Using Digital Photography. ANAL LETT 2011. [DOI: 10.1080/00032719.2010.520394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Zamora LL, López PA, Fos GMA, Algarra RM, Romero AMM, Calatayud JM. Quantitative colorimetric-imaging analysis of nickel in iron meteorites. Talanta 2010; 83:1575-9. [PMID: 21238754 DOI: 10.1016/j.talanta.2010.11.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 11/05/2010] [Accepted: 11/22/2010] [Indexed: 10/18/2022]
Abstract
A quantitative analytical imaging approach for determining the nickel content of metallic meteorites is proposed. The approach uses a digital image of a series of standard solutions of the nickel-dimethylglyoxime coloured chelate and a meteorite sample solution subjected to the same treatment as the nickel standards for quantitation. The image is processed with suitable software to assign a colour-dependent numerical value (analytical signal) to each standard. Such a value is directly proportional to the analyte concentration, which facilitates construction of a calibration graph where the value for the unknown sample can be interpolated to calculate the nickel content of the meteorite. The results thus obtained were validated by comparison with the official, ISO-endorsed spectrophotometric method for nickel. The proposed method is fairly simple and inexpensive; in fact, it uses a commercially available digital camera as measuring instrument and the images it provides are processed with highly user-friendly public domain software (specifically, ImageJ, developed by the National Institutes of Health and freely available for download on the Internet). In a scenario dominated by increasingly sophisticated and expensive equipment, the proposed method provides a cost-effective alternative based on simple, robust hardware that is affordable and can be readily accessed worldwide. This can be especially advantageous for countries were available resources for analytical equipment investments are scant. The proposed method is essentially an adaptation of classical chemical analysis to current, straightforward, robust, cost-effective instrumentation.
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Affiliation(s)
- L Lahuerta Zamora
- Departamento de Química, Bioquímica y Biología Molecular, Universidad CEU-Cardenal Herrera, Moncada, Valencia, Spain
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Welke JE, Hoeltz M, Dottori HA, Noll IB. Quantitative analysis of patulin in apple juice by thin-layer chromatography using a charge coupled device detector. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2010; 26:754-8. [PMID: 19680947 DOI: 10.1080/02652030802662746] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
A method was developed and validated in-house for the detection and quantification of patulin in apple juice concentrate using a charge coupled device (CCD) on thin-layer chromatography (TLC) plates. Samples were extracted with ethyl acetate and then cleaned-up by extraction with a sodium carbonate solution. The method showed a mean recovery of 95%. The quantification and detection limit were 14 microg l(-1) and 0.005 microg per spot, respectively. The CCD camera is sufficiently sensitive to detect changes in spot fluorescence intensity caused by small differences in mycotoxin concentration under homogeneous illumination from a UV light source. The results of validation confirmed the efficiency of the method, which is sensitive enough to be used to quantify patulin in apple juice by producers or for government monitoring/survey programs. The method was applied to the analysis of 16 apple juice concentrate samples and patulin levels ranged from 15 to 46 microg l(-1). This study demonstrated the applicability of the TLC-CCD technique as a tool for monitoring patulin in apple juice.
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Affiliation(s)
- Juliane Elisa Welke
- Institute of Food Science and Technology, Federal University of Rio Grande do Sul, 91570-901 Porto Alegre, RS, Brazil.
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Welke J, Hoeltz M, Dottori H, Noll I. Rapid, simple, and economical method for quantification of ochratoxin a in red wine. JPC-J PLANAR CHROMAT 2010. [DOI: 10.1556/jpc.23.2010.2.5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hemmateenejad B, Mobaraki N, Shakerizadeh-Shirazi F, Miri R. Multivariate image analysis-thin layer chromatography (MIA-TLC) for simultaneous determination of co-eluting components. Analyst 2010; 135:1747-58. [DOI: 10.1039/c0an00078g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang B, Bergström ET, Goodall DM, Myers P. Capillary action liquid chromatography. J Sep Sci 2009; 32:1831-7. [DOI: 10.1002/jssc.200800723] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Multianalyte imaging in one-shot format sensors for natural waters. Anal Chim Acta 2009; 636:210-7. [DOI: 10.1016/j.aca.2009.01.044] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Revised: 01/19/2009] [Accepted: 01/22/2009] [Indexed: 11/18/2022]
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17
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Efficient method of cyclic imides synthesis under ozone influence by the example of ε-caprolactam oxidation reaction. HETEROATOM CHEMISTRY 2008. [DOI: 10.1002/hc.20492] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Affiliation(s)
- Joseph Sherma
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042
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Lancaster M, Goodall DM, Bergström ET, McCrossen S, Myers P. Quantitative ultraviolet measurements on wetted thin-layer chromatography plates using a charge-coupled device camera. J Chromatogr A 2008; 1182:219-25. [DOI: 10.1016/j.chroma.2008.01.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Revised: 12/07/2007] [Accepted: 01/07/2008] [Indexed: 11/24/2022]
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