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Jantra J, Teepoo S, Thananimit S. Smartphone-based imaging colorimetric assay for monitoring the quality of curcumin in turmeric powder. ANAL SCI 2024:10.1007/s44211-024-00562-2. [PMID: 38607598 DOI: 10.1007/s44211-024-00562-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 03/16/2024] [Indexed: 04/13/2024]
Abstract
This research developed a colorimetric assay for semi-quantitative curcumin detection. The screening test was performed using a ferric chloride to form a brownish color which was further used to evaluate the amount of curcumin in the turmeric powder samples. The quantitative assay was performed based on the color intensity of the curcumin target using a smartphone digital image colorimetry with a developed lightbox constructed with a white light-emitting diodes (LED) light source as the measurement device. Images in red, green, and blue (RGB) color were processed to obtain relevant colors from the image and the color values were used to analyze curcumin concentrations. The intensity of the ΔB was correlated to the concentration of curcumin with high sensitivity. The method showed a linear range between 0.25 and 5 mg L-1 with the LOD and LOQ of 0.12 and 0.41 mg L-1, respectively. Sample analysis was carried out in turmeric powders. Curcumin in turmeric powder samples was simply extracted using acetonitrile followed by dilution 100 times for sample preparation. The accuracy was tested by spiking 0.25, 1.00, and 4.00 mg L-1 of standard curcumin into the turmeric sample solution. The average percentage recoveries were acceptable in all samples (90-104%). The method was validated by comparing the results obtained from the proposed method and high-performance liquid chromatography (HPLC). There was no statistically significant difference between the two methods (P = 0.05).
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Affiliation(s)
- Jongjit Jantra
- King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon Campus, Chumphon, 86160, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani, 12110, Thailand
| | - Suchera Thananimit
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Songkhla, 90110, Thailand.
- Center for Genomics and Bioinformatics Research, Faculty of Science, Prince of Songkla University, Songkhla, 90110, Thailand.
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Jantra J, Arsawiset S, Teepoo S, Keeratirawee K. Rapid colorimetric assay based on the oxidation of 2,2-azino-bis(3-ethylbenzothiazoline)-6-sulfonic acid-diammonium salt for nitrite detection in meat products. J Environ Sci Health B 2024; 59:72-80. [PMID: 38146233 DOI: 10.1080/03601234.2023.2297639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
This work developed a rapid colorimetric method for nitrite detection in meat products. The detection was based on the reaction of nitrite with 60 mM HCl to produce radicals which further oxidized ABTS (50 µM) to form a water-soluble blue-green product (ABTS•+). The absorbance was measured at a maximum absorption wavelength of 412.5 nm. Parameters such as concentration of HCl, concentration of ABTS and reaction time were evaluated. The absorbance was linearly proportional to the concentration of nitrite (0.1-20 µM) with the limit of detection of 0.34 µM. The proposed method was a time-saving assay since it required only 2 min to complete one measurement. There was no effect of the interference produced by other ions. The assay was robust with 2.5%RSD (n = 50). In meat product samples, high accuracy was observed with the recoveries between 100 ± 2.2% and 105 ± 3.7%. The amount of nitrite in meat products detected by the ABTS method was found in the range of 5.41 - 7.62 mg/kg. The conventional Griess method was applied to determine nitrite in the same meat products. There was no statistically significant difference between the two methods (P = 0.05).
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Affiliation(s)
- Jongjit Jantra
- King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon Campus, Pathio, Chumphon, Thailand
| | - Supattra Arsawiset
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology, Thanyaburi, Pathum Thani, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology, Thanyaburi, Pathum Thani, Thailand
| | - Kanchalar Keeratirawee
- King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon Campus, Pathio, Chumphon, Thailand
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Teepoo S, Jantra J, Panapong K, Ajayi DT. A highly sensitive hyperbranched Au plasmonic blackbody immunochromatographic assay for detection of leucomalachite green in fish and shrimp. Anal Chim Acta 2024; 1285:342031. [PMID: 38057063 DOI: 10.1016/j.aca.2023.342031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 11/12/2023] [Accepted: 11/13/2023] [Indexed: 12/08/2023]
Abstract
A novel immunochromatographic assay (ICA) based on hyperbranched Au plasmonic blackbodies (AuPBs) with a smartphone readout was fabricated for the detection of leucomalachite green (LMG) in fish and shrimp products. The ICA was carried out in a competitive immunoassay format with AuPBs as labels. The developed AuPBs-ICA allowed for the LMG detection with a low detection limit (0.15 μg L-1) within 5 min by the smartphone reader. With the label-AuPBs ICA, the color intensity response was linearly related to the concentrations of the LMG (0.2 -1.7 μg L-1). The test line signal could be clearly distinguished at a 1.7 μg L-1 LMG as a cut-off level by the naked eye, which is lower than the conventional colloidal gold nanoparticle (2 μg L-1) and star-shaped nanoparticles (1.9 μg L-1) labeling. LMG contamination in samples was determined with the proposed AuPBs-ICA and the enzyme-linked immunosorbent (ELISA). The AuPBs-ICA results showed good agreement with those from the ELISA. The proposed AuPBs-ICA has the potential to be used as a rapid, sensitive, and simple device for the analysis of LMG residues in fish and shrimp samples.
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Affiliation(s)
- Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand.
| | - Jongjit Jantra
- King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon, Pathiu, Chumphon, 86160, Thailand
| | - Khaunnapa Panapong
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
| | - David Taiwo Ajayi
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
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Arsawiset S, Sansenya S, Teepoo S. Nanozymes paper-based analytical device for the detection of organophosphate pesticides in fruits and vegetables. Anal Chim Acta 2023; 1267:341377. [PMID: 37257977 DOI: 10.1016/j.aca.2023.341377] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/10/2023] [Accepted: 05/14/2023] [Indexed: 06/02/2023]
Abstract
In this work, copper oxide nanoparticles (CuONPs) nanozymes paper-based analytical device was designed for the rapid detection of organophosphate pesticides in fruits and vegetables. The paper-based analytical device was modified with silica oxide nanoparticles to enhance the assay sensitivity. CuO nanozymes displayed peroxidase-like activity and catalyzed the oxidation of o-dianisidine in the presence of H2O2 from the hydrolysis of acetylthiocholine. This results in the formation of a brown-colored product. In the presence of organophosphate pesticides such as malathion, acetylcholinesterase activity was inhibited, resulting in reduced color intensity production, and which was measured with a smartphone. The proposed nanozymes paper-based analytical device exhibited a good linear detection range (0.1-5 mg L-1), a low detection limit of 0.08 mg L-1, and the analysis time was only about 10 min for malathion detection under optimal conditions. Moreover, the CuONPs had excellent catalytic activity and higher stability than peroxidase. Finally, this device can be applied to detect organophosphate pesticides in fruits and vegetables with rapidity, accuracy, portability, and ease of handling in the field.
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Affiliation(s)
- Supattra Arsawiset
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
| | - Sompong Sansenya
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand.
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Sannok T, Wechakorn K, Jantra J, Kaewchoay N, Teepoo S. Silica nanoparticle-modified paper strip-based new rhodamine B chemosensor for highly selective detection of copper ions in drinking water. Anal Bioanal Chem 2023:10.1007/s00216-023-04754-z. [PMID: 37222793 DOI: 10.1007/s00216-023-04754-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/27/2023] [Accepted: 05/12/2023] [Indexed: 05/25/2023]
Abstract
A new rhodamine B derivative (RDB) was synthesized and utilized for the colorimetric detection of copper ions (Cu2+). This chemosensor utilized a paper strip as a support and a smartphone as a detector for on-site quantitative detection of Cu2+ in water samples. Silica nanoparticles (SiNPs) were investigated as the modifier nanoparticles to achieve uniform color on the paper strip and showed a color response 1.9-fold higher than the one without SiNPs. The RDB chemosensor-based paper strip provided high selectivity toward Cu2+ with a detection limit of 0.7 mg/L, and the working concentrations for Cu2+ ranged from 1 to 17 mg/L. Parallel analyses of eight drinking water samples were conducted by inductively coupled plasma optical emission spectroscopy. The results were in good agreement, indicating the practical reliability of the established method with a short assay time and high selectivity. These indicate its great potential for on-site detection of Cu2+.
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Affiliation(s)
- Tadcha Sannok
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, 12110, Pathum Thani, Thailand
| | - Kanokorn Wechakorn
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, 12110, Pathum Thani, Thailand
| | - Jongjit Jantra
- King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon, Chumphon, 86160, Pathiu, Thailand
| | - Netnapit Kaewchoay
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, 12110, Pathum Thani, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, 12110, Pathum Thani, Thailand.
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Rakkhun W, Jantra J, Cheubong C, Teepoo S. Colorimetric test strip cassette readout with a smartphone for on-site and rapid screening test of carbamate pesticides in vegetables. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Teepoo S, Sannok T, Arsawiset S. A portable device as a paper test strip platform with smartphone applicationfor detection of branched-chain amino acids in edible insects. Food Chem 2022; 405:134560. [DOI: 10.1016/j.foodchem.2022.134560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/18/2022] [Accepted: 10/07/2022] [Indexed: 11/04/2022]
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Teepoo S, Laochai T. Reusable Optical Biosensor Based on Poly (Vinyl) Alcohol - Chitosan Cryogel with Incorporated Magnetic Nanoparticles for the Determination of Sucrose in Sugar Cane and Sugar. ANAL LETT 2021. [DOI: 10.1080/00032719.2021.1968889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology, Thanyaburi, Pathum Thani, Thailand
| | - Thidarut Laochai
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology, Thanyaburi, Pathum Thani, Thailand
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Archanachai K, Teepoo S, Sansenya S. Effect of gamma irradiation on growth, proline content, bioactive compound changes, and biological activity of 5 popular Thai rice cultivars. J Biosci Bioeng 2021; 132:372-380. [PMID: 34380601 DOI: 10.1016/j.jbiosc.2021.06.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 05/24/2021] [Accepted: 06/28/2021] [Indexed: 10/20/2022]
Abstract
Gamma irradiation is the technique used to induce plant mutation and it has affected both the physiological and biochemical compounds of the plant. Some new rice lines are also created through the gamma-irradiation technique. We investigated the effect of gamma irradiation on plant growth, volatile compounds, and the biological activity of gamma-irradiated rice extract compared to non-gamma-irradiated rice extract. The results reveal that the gamma-irradiated rice growth was related to the proline content, as the low gamma dose induced rice growth and proline accumulation in gamma-irradiated rice. We induced the bioactive compounds, including the flavonoid content and phenolic content of gamma-irradiated rice, through the low gamma irradiation dose at 60-100 Gy. Interestingly, bioactive compounds were stimulated by a gamma dose similar to that of the biological activity (antioxidant activity and enzyme inhibition) of gamma-irradiated rice. The results suggest that gamma-irradiated rice extract's biological activity was closely related to the flavonoid and phenolic content of rice. We also identified the variety of volatile compounds in gamma-irradiated rice and they were also reported for the biological activity. Our results can generate a new rice line that exhibits high plant growth and is rich with bioactive compounds such as flavonoid and phenolic compounds which are related to the improvement of human health.
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Affiliation(s)
- Kannika Archanachai
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand
| | - Sompong Sansenya
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand.
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Nochit P, Sub-udom P, Teepoo S. Multiwalled Carbon Nanotube (MWCNT) Based Electrochemical Paper-Based Analytical Device (ePAD) for the Determination of Catechol in Wastewater. ANAL LETT 2021. [DOI: 10.1080/00032719.2021.1872591] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Phatchada Nochit
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, Thailand
| | - Paitoon Sub-udom
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, Thailand
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Teepoo S, Wongtongdee U, Phapugrangkul P. Development of qualitative and quantitative immunochromatographic strip test assay for rapid and simple detection of leucomalachite green residual in aquatic animals. Food Chem 2020; 320:126613. [PMID: 32203833 DOI: 10.1016/j.foodchem.2020.126613] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 01/30/2020] [Accepted: 03/13/2020] [Indexed: 12/11/2022]
Abstract
A rapid and simple immunochromatographic strip test assay based on competitive format was developed for leucomalachite green (LMG) detection. LMG-bovine serum albumin and rabbit anti-sheep IgG were immobilized on nitrocellulose membrane for the test line and control line, respectively. Anti-LMG-colloidal gold conjugate was immobilized onto the conjugate pad. For qualitative detection, the cut-off limit of the strip test was determined at 2 µg/L by the naked eye. For quantitative analysis, the working range of the LMG detection was 0.7-2 µg/L with LOD at 0.28 µg/L. A one-step immunochromatographic strip test for LMG detection can be completed within 5 min without any incubation, washing and blocking steps. Analysis results of LMG in aquatic animals obtained from the immunochromatographic strip test were in good agreement with those realized from enzyme-link immunosorbent assay. The developed the immunochromatographic strip test offered rapid detection as a simple (one-step), cost-effective, instrument-free assay and no need for handling reagents.
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Affiliation(s)
- Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani 12110, Thailand.
| | - Uraiwan Wongtongdee
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani 12110, Thailand
| | - Pongsathon Phapugrangkul
- Thailand Institute of Scientific and Technological Research, Khlong Luang, Pathum Thani, 12120, Thailand
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Muhammad-Aree S, Teepoo S. On-site detection of heavy metals in wastewater using a single paper strip integrated with a smartphone. Anal Bioanal Chem 2020; 412:1395-1405. [PMID: 31919608 DOI: 10.1007/s00216-019-02369-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 11/23/2019] [Accepted: 12/19/2019] [Indexed: 10/25/2022]
Abstract
A field paper-based heavy metal strip was designed and implemented for simultaneous detection of the heavy metals Zn, Cr, Cu, Pb and Mn in wastewater samples. The colorimetric paper strip was fabricated by drop-casting of chromogenic reagents onto detection zones. When the fabricated paper strip was exposed to Zn, Cr, Cu, Pb and Mn, multiple colors appeared that were then recorded with a smartphone followed by processing in the Color Picker application. After optimizing the analytical parameters, such as the chromogenic concentration, pH and reaction time, the paper strip achieved detection limits of 0.63, 0.07, 0.17, 0.03 and 0.11 mg/L for Zn, Cr, Cu, Pb and Mn, respectively. Five heavy metals analyses were able to be performed within 1 min on one paper strip. This paper strip is accurate with recoveries from 87 to 107%. The results of the proposed paper strip correlated well with those determined by inductively coupled plasma-optical emission spectrometry of wastewater samples. The use of a single paper strip integrated with a smartphone for the detection of five heavy metals in wastewater represents an all-in-one device with on-site detection, leading to cost-effective and rapid assays that show a great application potential for on-site environmental monitoring. Graphical abstract.
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Affiliation(s)
- Supattra Muhammad-Aree
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand
| | - Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110, Thailand.
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Aksorn J, Teepoo S. Development of the simultaneous colorimetric enzymatic detection of sucrose, fructose and glucose using a microfluidic paper-based analytical device. Talanta 2020; 207:120302. [DOI: 10.1016/j.talanta.2019.120302] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 08/26/2019] [Accepted: 08/27/2019] [Indexed: 02/05/2023]
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Teepoo S, Dawan P, Barnthip N. Electrospun Chitosan-Gelatin Biopolymer Composite Nanofibers for Horseradish Peroxidase Immobilization in a Hydrogen Peroxide Biosensor. Biosensors (Basel) 2017; 7:E47. [PMID: 29036932 PMCID: PMC5746770 DOI: 10.3390/bios7040047] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 10/09/2017] [Accepted: 10/10/2017] [Indexed: 12/18/2022]
Abstract
A biosensor based on chitosan-gelatin composite biopolymers nanofibers is found to be effective for the immobilization of horseradish peroxidase to detect hydrogen peroxide. The biopolymer nanofibers were fabricated by an electrospining technique. Upon optimization of synthesis parameters, biopolymers nanofibers, an average of 80 nm in diameter, were obtained and were then modified on the working electrode surface. The effects of the concentration of enzyme, pH, and concentration of the buffer and the working potential on the current response of the nanofibers-modified electrode toward hydrogen peroxide were optimized to obtain the maximal current response. The results found that horseradish peroxidase immobilization on chitosan-gelatin composite biopolymer nanofibers had advantages of fast response, excellent reproducibility, high stability, and showed a linear response to hydrogen peroxide in the concentration range from 0.1 to 1.7 mM with a detection limit of 0.05 mM and exhibited high sensitivity of 44 µA∙mM-1∙cm-2. The developed system was evaluated for analysis of disinfectant samples and showed good agreement between the results obtained by the titration method without significant differences at the 0.05 significance level. The proposed strategy based on chitosan-gelatin composite biopolymer nanofibers for the immobilization of enzymes can be extended for the development of other enzyme-based biosensors.
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Affiliation(s)
- Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathumthani 12110, Thailand.
| | - Phanphruk Dawan
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathumthani 12110, Thailand.
| | - Naris Barnthip
- Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathumthani 12110, Thailand.
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Teepoo S, Chumsaeng P, Palasak K, Bousod N, Mhadbamrung N, Sae-lim P. Unmodified gold nanoparticles as a simple colorimetric probe for ramoplanin detection. Talanta 2013; 117:518-22. [PMID: 24209375 DOI: 10.1016/j.talanta.2013.08.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 08/10/2013] [Accepted: 08/13/2013] [Indexed: 11/25/2022]
Abstract
In this paper unmodified gold nanoparticles (AuNPs) were used as a sensing element to detect ramoplamin. Detection relies on the fact that the dispersed AuNPs solution is red due to the intense surface plasmon absorption band at 530 nm whereas the AuNPs solution in the presence of ramoplanin is blue. Upon aggregation, there is a significant change in absorbance intensity at 620 nm. Based on the aggregation of AuNPs induced by ramoplanin, a simple colorimetric method was developed for determining the of ramoplanin concentration. Experimental conditions influencing the analytical performance such as particle size, amount of AuNPs, incubation time and pH were evaluated. Under the optimized experimental conditions, this method could detect ramoplanin in a linear range from 0.30 to 1.30 ppm with a detection limit of 0.01 ppm and exhibited good reproducibility, selectivity and recovery. Analysis time of this assay was only 2 min. To investigate its potential applicability, this assay was successfully applied for the determination of ramoplanin in urine samples without costly instruments.
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Affiliation(s)
- Siriwan Teepoo
- Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathumthani 12110, Thailand.
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Teepoo S, Chumsaeng P, Jongjinako S, Chantu K, Nolykad W. A New Simple and Rapid Colorimetric Screening Test for Semi-qualitative
Analysis of Vitamin C in Fruit Juices Based on Prussian Blue. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/jas.2012.568.574] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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