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Roelse M, Krasteva N, Pawlizak S, Mai MK, Jongsma MA. Tongue-on-a-Chip: Parallel Recording of Sweet and Bitter Receptor Responses to Sequential Injections of Pure and Mixed Sweeteners. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:15854-15864. [PMID: 38951504 PMCID: PMC11261611 DOI: 10.1021/acs.jafc.4c00815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 06/18/2024] [Accepted: 06/22/2024] [Indexed: 07/03/2024]
Abstract
A microfluidic tongue-on-a-chip platform has been evaluated relative to the known sensory properties of various sweeteners. Analogous metrics of typical sensory features reported by human panels such as sweet taste thresholds, onset, and lingering, as well as bitter off-flavor and blocking interactions were deduced from the taste receptor activation curves and then compared. To this end, a flow cell containing a receptor cell array bearing the sweet and six bitter taste receptors was transiently exposed to pure and mixed sweetener samples. The sample concentration gradient across time was separately characterized by the injection of fluorescein dye. Subsequently, cellular calcium responses to different doses of advantame, aspartame, saccharine, and sucrose were overlaid with the concentration gradient. Parameters describing the response kinetics compared to the gradient were quantified. Advantame at 15 μM recorded a significantly faster sweetness onset of 5 ± 2 s and a longer lingering time of 39 s relative to sucrose at 100 mM with an onset of 13 ± 2 s and a lingering time of 6 s. Saccharine was shown to activate the bitter receptors TAS2R8, TAS2R31, and TAS2R43, confirming its known off-flavor, whereas addition of cyclamate reduced or blocked this saccharine bitter response. The potential of using this tongue-on-a-chip to bridge the gap with in vitro assays and taste panels is discussed.
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Affiliation(s)
- Margriet Roelse
- BU
Bioscience, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Nadejda Krasteva
- Stuttgart
Laboratory 2, Sony Semiconductor Solutions Europe, Sony Europe B.V., Zweigniederlassung Deutschland,
Hedelfinger Str. 61, 70327 Stuttgart, Germany
| | - Steve Pawlizak
- Stuttgart
Laboratory 2, Sony Semiconductor Solutions Europe, Sony Europe B.V., Zweigniederlassung Deutschland,
Hedelfinger Str. 61, 70327 Stuttgart, Germany
| | - Michaela K. Mai
- Stuttgart
Laboratory 2, Sony Semiconductor Solutions Europe, Sony Europe B.V., Zweigniederlassung Deutschland,
Hedelfinger Str. 61, 70327 Stuttgart, Germany
| | - Maarten A. Jongsma
- BU
Bioscience, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
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Hirata Y, Oda H, Osaki T, Takeuchi S. Biohybrid sensor for odor detection. LAB ON A CHIP 2021; 21:2643-2657. [PMID: 34132291 DOI: 10.1039/d1lc00233c] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Biohybrid odorant sensors that directly integrate a biological olfactory system have been increasingly studied and are suggested to be the next generation of ultrasensitive sensors by taking advantage of the sensitivity and selectivity of living organisms. In this review, we provide a detailed description of the recent developments of biohybrid odorant sensors, especially considering the requisites for their perspective of on-site applications. We introduce the methodologies to effectively capture the biological signals from olfactory systems by readout devices, and describe the essential properties regarding the gaseous detection, stability, quality control, and portability. Moreover, we address the recent progress on multiple odorant recognition using multiple sensors as well as the current screening approaches for pairs of orphan receptors and ligands necessary for the extension of the currently available range of biohybrid sensors. Finally, we discuss our perspectives for the future for the development of practical odorant sensors.
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Affiliation(s)
- Yusuke Hirata
- Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Haruka Oda
- Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Toshihisa Osaki
- Artificial Cell Membrane Systems Group, Kanagawa Institute of Industrial Science and Technology, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan and Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Shoji Takeuchi
- Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. and Artificial Cell Membrane Systems Group, Kanagawa Institute of Industrial Science and Technology, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan and Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Roelse M, Wehrens R, Henquet MG, Witkamp RF, Hall RD, Jongsma MA. The Effect of Calcium Buffering and Calcium Sensor Type on the Sensitivity of an Array-Based Bitter Receptor Screening Assay. Chem Senses 2019; 44:497-505. [PMID: 31278864 PMCID: PMC7357244 DOI: 10.1093/chemse/bjz044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The genetically encoded calcium sensor protein Cameleon YC3.6 has previously been applied for functional G protein-coupled receptor screening using receptor cell arrays. However, different types of sensors are available, with a wide range in [Ca2+] sensitivity, Hill coefficients, calcium binding domains, and fluorophores, which could potentially improve the performance of the assay. Here, we compared the responses of 3 structurally different calcium sensor proteins (Cameleon YC3.6, Nano140, and Twitch2B) simultaneously, on a single chip, at different cytosolic expression levels and in combination with 2 different bitter receptors, TAS2R8 and TAS2R14. Sensor concentrations were modified by varying the amount of calcium sensor DNA that was printed on the DNA arrays prior to reverse transfection. We found that ~2-fold lower concentrations of calcium sensor protein, by transfecting 4 times less sensor-coding DNA, resulted in more sensitive bitter responses. The best results were obtained with Twitch2B, where, relative to YC3.6 at the default DNA concentration, a 4-fold lower DNA concentration increased sensitivity 60-fold and signal strength 5- to 10-fold. Next, we compared the performance of YC3.6 and Twitch2B against an array with 11 different bitter taste receptors. We observed a 2- to 8-fold increase in sensitivity using Twitch2B compared with YC3.6. The bitter receptor arrays contained 300 spots and could be exposed to a series of 18 injections within 1 h resulting in 5400 measurements. These optimized sensor conditions provide a basis for enhancing receptomics calcium assays for receptors with poor Ca2+ signaling and will benefit future high-throughput receptomics experiments.
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Affiliation(s)
- Margriet Roelse
- BU Bioscience, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen, The Netherlands.,Laboratory of Plant Physiology, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen.,Nutritional Biology and Health, Wageningen University and Research, Stippeneng, WE Wageningen, The Netherlandsand
| | - Ron Wehrens
- BU Bioscience, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen, The Netherlands.,BU Biometris, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen
| | - Maurice Gl Henquet
- BU Bioscience, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen, The Netherlands
| | - Renger F Witkamp
- Nutritional Biology and Health, Wageningen University and Research, Stippeneng, WE Wageningen, The Netherlandsand
| | - Robert D Hall
- BU Bioscience, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen, The Netherlands.,Laboratory of Plant Physiology, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen
| | - Maarten A Jongsma
- BU Bioscience, Wageningen University and Research, Droevendaalsesteeg, PB Wageningen, The Netherlands
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