2008
DOI: 10.1364/oe.16.001577
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Microfluidic devices for terahertz spectroscopy of biomolecules

Abstract: We demonstrate microfluidic devices for terahertz spectroscopy of biomolecules in aqueous solutions. The devices are fabricated out of a plastic material that is both mechanically rigid and optically transparent with near-zero dispersion in the terahertz frequency range. Using a lowpower terahertz time-domain spectrometer, we experimentally measure the absorption spectra of the vibrational modes of bovine serum albumin from 0.5 - 2.5 THz and find good agreement with previously reported data obtained using larg… Show more

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Cited by 116 publications
(59 citation statements)
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“…For example, BSA solution in water at 0.1% w/w concentration was shown clearly to have higher absorption compared to water in the 2-2.5 THz spectral domain 3 (as judged by the higher imaginary part of the dielectric constant), while the absorption of BSA in 50 mM phosphate buffer at 101 mg/ml was shown to have less absorption than the buffer by approximately 8% over the frequency domain from 0.5 to 2.5 THz. 34 The BSA concentration in the later study is 100 times higher, and the buffer is also different. Importantly, in this frequency domain, the influence of the intermolecular stretching mode in water, centered at 5.3 THz, has to be considered.…”
Section: Introductionmentioning
confidence: 75%
“…For example, BSA solution in water at 0.1% w/w concentration was shown clearly to have higher absorption compared to water in the 2-2.5 THz spectral domain 3 (as judged by the higher imaginary part of the dielectric constant), while the absorption of BSA in 50 mM phosphate buffer at 101 mg/ml was shown to have less absorption than the buffer by approximately 8% over the frequency domain from 0.5 to 2.5 THz. 34 The BSA concentration in the later study is 100 times higher, and the buffer is also different. Importantly, in this frequency domain, the influence of the intermolecular stretching mode in water, centered at 5.3 THz, has to be considered.…”
Section: Introductionmentioning
confidence: 75%
“…Low THz-loss polymers such as Zeonor 1020R have been used to create suitable devices. 4 The use of plasma polymerised tetramethyldisiloxane is another possible emerging candidate for a polymer solution; 5 however, more detailed work still needs to be undertaken into the THz absorption properties of the material. Silicon-glass microfluidic devices have been demonstrated in the past, 6 though they are unsuitable for THz frequencies due to the scattering effects induced by the glass.…”
Section: Microfluidics For Thz Frequenciesmentioning
confidence: 99%
“…Consequently, THz frequencies bring information concerning radicals, biomolecules but also concerning conformational states of proteins [5,6]. Today, lot of biological studies concern protein-protein or protein-cell real-time interactions [7,8]. THz microfluidic microsystems should be a useful tool to get sensitive and reproducible measurements in this way.…”
Section: Introductionmentioning
confidence: 99%