Abstract
A novel paper-based capacitance mast cell sensor has been designed and developed for real-time monitoring of the major peanut allergen Ara h 2. In this study, we created the 3D paper chip printed with carbon electrodes as a non-contact capacitance sensing platform. To improve the conductivity and biocompatibility of the cellulose paper, a polyvinyl alcohol (PVA)-gelatin methacryloyl (GelMA)-nano-hydroxyapatite (nHAP) composite hydrogel (PGHAP gel) was employed to fabricate the prepared paper chip. When rat basophilic leukemia mast cells (RBL-2H3) are immobilized and cultured in the 3D culture system consisting of PGHAP gel and paper fibers, identification signals of Ara h 2 could be specifically monitored non-contact and real-time by capacitance change measurement. This 3D structure combined with time-lapse monitoring completes the capacitance cell sensor. Results indicate that Ara h 2 has given a remarkable decrease to the capacitance in dose-dependent range from 0.1 to 100 ng/mL. Therefore, the real-time cell allergic response could be accurately monitored by this low-cost, disposable cell sensor, which supplies a novel and effective pathway for the rapid and accurate evaluation for food allergens.
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Funding
This work was supported by the National Natural Science Foundation of China (No. 31601535), the Natural Science Foundation of Jiangsu Province (No. BK20160459, BK20180160), the Science and Technology Development Project of Nanjing (201716006), the Special Program of the State Administration for Market Regulation (2019YJ047), the Science and Technology Program of Nanjing Administration for Market Regulation (Kj2019042), and the National Key Research and Development Program of China (2016YFD0400206-3, 2016YFD0400201),
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Donglei Jiang declares that he has no conflict of interest. Hui Jiang declares that she has no conflict of interest. Lifeng Wang declares that he has no conflict of interest.
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Jiang, D., Jiang, H. & Wang, L. A Novel Paper-Based Capacitance Mast Cell Sensor for Evaluating Peanut Allergen Protein Ara h 2. Food Anal. Methods 13, 1993–2001 (2020). https://doi.org/10.1007/s12161-020-01769-5
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DOI: https://doi.org/10.1007/s12161-020-01769-5