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Apostolou T, Pascual N, Marco MP, Moschos A, Petropoulos A, Kaltsas G, Kintzios S. Extraction-less, rapid assay for the direct detection of 2,4,6-trichloroanisole (TCA) in cork samples. Talanta 2014; 125:336-40. [PMID: 24840453 DOI: 10.1016/j.talanta.2014.03.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 02/26/2014] [Accepted: 03/12/2014] [Indexed: 11/17/2022]
Abstract
2,4,6-trichloroanisole (TCA), the cork taint molecule, has been the target of several analytical approaches over the few past years. In spite of the development of highly efficient and sensitive tools for its detection, ranging from advanced chromatography to biosensor-based techniques, a practical breakthrough for routine cork screening purposes has not yet been realized, in part due to the requirement of a lengthy extraction of TCA in organic solvents, mostly 12% ethanol and the high detectability required. In the present report, we present a modification of a previously reported biosensor system based on the measurement of the electric response of cultured fibroblast cells membrane-engineered with the pAb78 TCA-specific antibody. Samples were prepared by macerating cork tissue and mixing it directly with the cellular biorecognition elements, without any intervening extraction process. By using this novel approach, we were able to detect TCA in just five minutes at extremely low concentrations (down to 0.2 ppt). The novel biosensor offers a number of practical benefits, including a very considerable reduction in the total assay time by one day, and a full portability, enabling its direct employment for on-site, high throughput screening of cork in the field and production facilities, without requiring any type of supporting infrastructure.
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Affiliation(s)
- Theofylaktos Apostolou
- Faculty of Biotechnology, School of Food, Biotechnology and Development, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Nuria Pascual
- Nanobiotechnology for Diagnostics (Nb4D) Group, IQAC-CSIC, Jordi Girona, 18-26, 08034 Barcelona, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain
| | - M-Pilar Marco
- Nanobiotechnology for Diagnostics (Nb4D) Group, IQAC-CSIC, Jordi Girona, 18-26, 08034 Barcelona, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain
| | - Anastassios Moschos
- Department of Electronics, Technical Educational Institute (T.E.I.) of Athens, Greece
| | | | - Grigoris Kaltsas
- Department of Electronics, Technical Educational Institute (T.E.I.) of Athens, Greece
| | - Spyridon Kintzios
- Faculty of Biotechnology, School of Food, Biotechnology and Development, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece.
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Yuan M, Liu B, Liu E, Sheng W, Zhang Y, Crossan A, Kennedy I, Wang S. Immunoassay for phenylurea herbicides: application of molecular modeling and quantitative structure-activity relationship analysis on an antigen-antibody interaction study. Anal Chem 2011; 83:4767-74. [PMID: 21539295 DOI: 10.1021/ac200227v] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An indirect competitive enzyme-linked immunosorbent assay (icELISA) for 12 phenylurea herbicides (PUHs) was established with the half-maximum inhibition concentration (IC(50)) of 1.7-920.7 μg L(-1). A method of computer-aided molecular modeling was established in quantitative structure-activity relationship (QSAR) studies to obtain a deeper insight into the PUHs' antibody interactions on how and which molecular properties of the analytes quantitatively affect the antibody recognition. A two-dimensional (2D)-QSAR model based on the Hansch equation and a hologram QSAR (HQSAR) model were constructed, and both showed highly predictive abilities with cross-validation q(2) values of 0.820 and 0.752, respectively. It was revealed that the most important impact factor of the antibody recognition was the PUHs' hydrophobicity (log P), which provided a quadratic correlation to the antibody recognition. Hapten-carrier linking groups were less exposed to antibodies during immunization; thus, groups of the analytes in the same position were generally considered to be less contributive to antibody recognition during immunoassay. But the results of substructure-level analysis showed that these groups played an important role in the antigen-antibody interaction. In addition, the frontier-orbital energy parameter E(LUMO) was also demonstrated as a related determinant for this reaction. In short, the result demonstrated that the hydrophobicity and the lowest unoccupied molecular orbital energy (E(LUMO)) of PUH molecules were mainly responsible for antibody recognition.
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Affiliation(s)
- Meng Yuan
- Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, Tianjin University of Science and Technology, Tianjin 300457, China
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12
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Xu ZL, Shen YD, Zheng WX, Beier RC, Xie GM, Dong JX, Yang JY, Wang H, Lei HT, She ZG, Sun YM. Broad-Specificity Immunoassay for O,O-Diethyl Organophosphorus Pesticides: Application of Molecular Modeling to Improve Assay Sensitivity and Study Antibody Recognition. Anal Chem 2010; 82:9314-21. [DOI: 10.1021/ac1018414] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhen-Lin Xu
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Yu-Dong Shen
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Wen-Xu Zheng
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Ross C. Beier
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Gui-Mian Xie
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Jie-Xian Dong
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Jin-Yi Yang
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Hong Wang
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Hong-Tao Lei
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Zhi-Gang She
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
| | - Yuan-Ming Sun
- Key Laboratory of Food Quality and Safety of Guangdong Province, South China Agricultural University, Guangzhou 510642, China, Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845-4988, United States, and School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingangxi Road, Guangzhou 510275, China
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