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Mid-infrared thin-film diamond waveguides combined with tunable quantum cascade lasers for analyzing the secondary structure of proteins
Univ Ulm, Inst Analyt & Bioanalyt Chem, D-89081 Ulm, Germany.
Univ Ulm, Inst Analyt & Bioanalyt Chem, D-89081 Ulm, Germany.
Univ Ulm, Inst Analyt & Bioanalyt Chem, D-89081 Ulm, Germany.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
Vise andre og tillknytning
2016 (engelsk)Inngår i: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 213, nr 8, s. 2117-2123Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Diamond has excellent optical properties including broadband transmissivity, low self-absorption, and a high refractive index, which have prompted its use for optical sensing applications. Thin-film diamond strip waveguides (DSWGs) combined with tunable quantum cascade lasers (tQCLs) providing an emission wavelength range of 5.78-6.35 mu m (1735-1570 cm(-1)) have been used to obtain mid-infrared (MIR) spectra of proteins, thereby enabling the analysis of their secondary structure via the amide I band. Three different proteins were analyzed, namely bovine serum albumin (BSA), myoglobin, and gamma-globulin. The secondary structure of BSA and myoglobin has a major contribution of a-helices, whereas gamma-globulins are rich in beta-sheet structures, which is reflected in the amide I band. Acomparison of the spectra obtained via the combination of the tQCL and DSWG with spectra obtained using conventional Fourier transform infrared (FTIR) spectroscopy and a commercial diamond attenuated total reflection (ATR) element has been performed. It is shown that the main features evident in FTIR-ATR spectra are also obtained using tQCL-DSWG sensors.

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2016. Vol. 213, nr 8, s. 2117-2123
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URN: urn:nbn:se:uu:diva-282255DOI: 10.1002/pssa.201600134ISI: 000385223900016OAI: oai:DiVA.org:uu-282255DiVA, id: diva2:916787
Tilgjengelig fra: 2016-04-04 Laget: 2016-04-04 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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