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Hou Z, Yan B, Zhao Y, Peng B, Zhang S, Su B, Li K, Zhang C. Terahertz Spectra of Mannitol and Erythritol: A Joint Experimental and Computational Study. Molecules 2024; 29:3154. [PMID: 38999105 PMCID: PMC11243331 DOI: 10.3390/molecules29133154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2024] [Revised: 06/26/2024] [Accepted: 07/01/2024] [Indexed: 07/14/2024] Open
Abstract
Sugar substitutes, which generally refer to a class of food additives, mostly have vibration frequencies within the terahertz (THz) band. Therefore, THz technology can be used to analyze their molecular properties. To understand the characteristics of sugar substitutes, this study selected mannitol and erythritol as representatives. Firstly, PXRD and Raman techniques were used to determine the crystal structure and purity of mannitol and erythritol. Then, the THz time-domain spectroscopy (THz-TDS) system was employed to measure the spectral properties of the two sugar substitutes. Additionally, density functional theory (DFT) was utilized to simulate the crystal configurations of mannitol and erythritol. The experimental results showed good agreement with the simulation results. Finally, microfluidic chip technology was used to measure the THz spectroscopic properties of the two sugar substitutes in solution. A comparison was made between their solid state and aqueous solution state, revealing a strong correlation between the THz spectra of the two sugar substitutes in both states. Additionally, it was found that the THz spectrum of a substance in solution is related to its concentration. This study provides a reference for the analysis of sugar substitutes.
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Affiliation(s)
- Zeyu Hou
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Bingxin Yan
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Yuhan Zhao
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Bo Peng
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Shengbo Zhang
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Bo Su
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Kai Li
- Department of Chemistry, Capital Normal University, Beijing 100048, China
| | - Cunlin Zhang
- Department of Physics, Capital Normal University, Beijing 100048, China
- Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China
- Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
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Meng Q, Zhao Y, Wang X, Su B, Zhang S, Cui H, Zhang C. Highly integrated automatic injection terahertz microfluidic biosensor based on metasurface and LT-GaAs photoconductive antenna. OPTICS EXPRESS 2024; 32:16867-16878. [PMID: 38858883 DOI: 10.1364/oe.518638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 04/09/2024] [Indexed: 06/12/2024]
Abstract
In this paper, a highly integrated terahertz (THz) biosensor is proposed and implemented, which pioneered the preparation of low-temperature gallium arsenide (LT-GaAs) thin film photoconductive antenna (PCA) on the sensor for direct generation and detection of THz waves, simplifying complex terahertz time-domain spectroscopy (THz-TDS) systems. A latch type metasurface is deposited in the detection region to produce a resonance absorption peak at 0.6 THz that is independent of polarisation. Microfluidics is utilised and automatic injection is incorporated to mitigate the experimental effects of hydrogen bond absorption of THz waves in aqueous-based environment. Additionally, cell damage is minimised by regulating the cell flow rate. The biosensor was utilised to detect the concentration of three distinct sizes of bacteria with successful results. The assay was executed as a proof of concept to detect two distinct types of breast cancer cells. Based on the experimental findings, it has been observed that the amplitude and blueshift of the resonance absorption peaks have the ability to identify and differentiate various cancer cell types. The findings of this study introduce a novel approach for developing microfluidic THz metasurface biosensors that possess exceptional levels of integration, sensitivity, and rapid label-free detection capabilities.
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Meng Q, Wang X, Zhang B, Qian S, Peng B, Zhou H, Su B, Zhang C. Magnetic induced terahertz modulation characteristics based on ferromagnetic nematic liquid crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 289:122232. [PMID: 36525811 DOI: 10.1016/j.saa.2022.122232] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 11/21/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
In recent years, solid state terahertz (THz) modulators have obtained rapid progress with the widespread use of two-dimensional (2D) materials in the field of THz; however, challenges remain in preparing flexible THz modulators. In this study, flexible ferromagnetic nematic materials were prepared by doping thermotropic nematic liquid crystals 5CB into magnetic fluids, and the influence of water was reduced by a self-made cyclic olefin copolymer (COC) microfluidic chip. THz modulation characteristics of magnetic fluid and ferromagnetic nematic liquid crystal (FNLC) under the induction of external magnetic field were compared using a THz time domain spectroscopy system. Under the action of a 91 mT magnetic field, the magnetic fluid has a maximum modulation depth (MD) of 54%. Under the same magnetic field, the maximum MD of the FNLC materials increase to 78% because of the rearrangement of Fe3O4 nanoparticles induced by the topological defect of the liquid crystal. We demonstrate that the magneto-optical effect is significantly enhanced in the ferromagnetic nematic liquid crystal hybrid system. This strategy of doping thermotropic nematic liquid crystals to enhance the magneto-optical effect has great potential for THz filtering, modulation, and sensing applications.
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Affiliation(s)
- Qinghao Meng
- Department of Physics, Capital Normal University, Beijing 100048, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China; Beijing Advanced Innovation Centre for Imaging Theory and Technology, Beijing 100048, China; Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Xueyan Wang
- Department of Physics, Capital Normal University, Beijing 100048, China
| | - Boyan Zhang
- Department of Physics, Capital Normal University, Beijing 100048, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China; Beijing Advanced Innovation Centre for Imaging Theory and Technology, Beijing 100048, China; Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Siyu Qian
- Department of Physics, Capital Normal University, Beijing 100048, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China; Beijing Advanced Innovation Centre for Imaging Theory and Technology, Beijing 100048, China; Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Bo Peng
- Department of Physics, Capital Normal University, Beijing 100048, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China; Beijing Advanced Innovation Centre for Imaging Theory and Technology, Beijing 100048, China; Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
| | - Hangyu Zhou
- Department of Physics, Capital Normal University, Beijing 100048, China
| | - Bo Su
- Department of Physics, Capital Normal University, Beijing 100048, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China; Beijing Advanced Innovation Centre for Imaging Theory and Technology, Beijing 100048, China; Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China.
| | - Cunlin Zhang
- Department of Physics, Capital Normal University, Beijing 100048, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China; Beijing Advanced Innovation Centre for Imaging Theory and Technology, Beijing 100048, China; Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
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Datta S, Prasertsuk K, Khammata N, Rattanawan P, Chia JY, Jintamethasawat R, Chulapakorn T, Limpanuparb T. Terahertz Spectroscopic Analysis of Lactose in Infant Formula: Implications for Detection and Quantification. Molecules 2022; 27:5040. [PMID: 35956992 PMCID: PMC9370465 DOI: 10.3390/molecules27155040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 07/29/2022] [Accepted: 08/04/2022] [Indexed: 11/16/2022] Open
Abstract
Lactose plays a significant role in daily lives as a constituent of various food and pharmaceutical products. Yet, lactose intolerance conditions demand low-lactose and lactose-free products in the market. These increasing nutritional claims and labels on food products entail simple and reliable methods of analysis that can be used for meeting quality standards, nutritional claims and legal requirements. In this study, terahertz time-domain spectroscopy (THz-TDS) was employed to analyse α-lactose monohydrate qualitatively and quantitatively in food products. Both absorption spectra and absorption coefficient spectra were investigated for their prediction performance. Regression models for lactose quantification using peak area and height of the absorption peaks 0.53 and 1.37 THz were developed and assessed in infant formula samples. Satisfactory prediction results were achieved in ideal conditions with pure standards, but not in all predictions of infant formula samples. Reasons and further implications are discussed.
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Affiliation(s)
- Sopanant Datta
- Science Division, Mahidol University International College, Mahidol University, Salaya, Phutthamonthon, Nakhon Pathom 73170, Thailand
| | - Kiattiwut Prasertsuk
- National Electronics and Computer Technology, National Science and Technology Development Agency, 112 Thailand Science Park, Khlong Luang 12120, Thailand
| | - Nuttawat Khammata
- Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Patharakorn Rattanawan
- National Electronics and Computer Technology, National Science and Technology Development Agency, 112 Thailand Science Park, Khlong Luang 12120, Thailand
| | - Jia Yi Chia
- National Electronics and Computer Technology, National Science and Technology Development Agency, 112 Thailand Science Park, Khlong Luang 12120, Thailand
| | - Rungroj Jintamethasawat
- National Electronics and Computer Technology, National Science and Technology Development Agency, 112 Thailand Science Park, Khlong Luang 12120, Thailand
| | - Thawatchart Chulapakorn
- National Electronics and Computer Technology, National Science and Technology Development Agency, 112 Thailand Science Park, Khlong Luang 12120, Thailand
- Department of Construction Sciences, Lund University, 22100 Lund, Sweden
| | - Taweetham Limpanuparb
- Science Division, Mahidol University International College, Mahidol University, Salaya, Phutthamonthon, Nakhon Pathom 73170, Thailand
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Meng Q, Ding J, Peng B, Zhang B, Qian S, Su B, Zhang C. Terahertz modulation characteristics of three nanosols under external field control based on microfluidic chip. iScience 2022; 25:104898. [PMID: 36043051 PMCID: PMC9420507 DOI: 10.1016/j.isci.2022.104898] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 07/08/2022] [Accepted: 08/03/2022] [Indexed: 11/26/2022] Open
Abstract
Recently, with the widespread application of metamaterials in the terahertz (THz) modulation field, solid-state THz modulators have made breakthrough progress; however, there are still challenges in preparing flexible THz modulators with wide modulation bandwidths. In this study, a THz microfluidic chip was fabricated using cycloolefin copolymers with high transmission (90%) of THz waves. The THz modulation characteristics of TiO2, Ag, and Fe3O4 nanosols under the control of an optical field, electric field, and magnetic field, respectively, were investigated. Under the action of photogenerated carrier migration, colloidal electrophoresis, and magneto-optical effect, all three nanosols exhibit broadband modulation performance in the frequency range of 0.3–2.4 THz, and the maximum modulation depth is 24%, 33%, and 54%, respectively. Contrary to previous studies based on traditional solid-state materials, this study innovatively explores the possibility of modulating THz waves with liquid materials, laying the foundation for the application of flexible liquid-film THz modulators. THz broadband amplitude modulation of liquid nanosols under external fields Using a microfluidic chip to reduce the absorption of THz waves by hydrogen bonds The experimental results lay a foundation for liquid-film THz modulators
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