Terahertz spectroscopic techniques for the study of proteins in aqueous solutions

Erik Bründermann; Benjamin Born; Stefan Funkner; Matthias Krüger; Martina Havenith

doi:10.1117/12.808270

9 February 2009 Terahertz spectroscopic techniques for the study of proteins in aqueous solutions

Erik Bründermann, Benjamin Born, Stefan Funkner, Matthias Krüger, Martina Havenith

Proceedings Volume 7215, Terahertz Technology and Applications II; 72150E (2009) https://doi.org/10.1117/12.808270
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

Liquid water is a very strong absorber in the THz frequency range. We have set-up a unique germanium laser spectrometer consisting of a Ge:Be laser, tunable from 1 to 4 THz, and a sensitive Ge photoconductor detector. The spectrometer uses a measurement scheme alternating sample and reference signal while placed in an environmentally controlled housing for high stability of temperature and humidity. The laser system leads to a very small statistical error in the absolute absorption coefficient (400-500 cm^-1) of less than 0.1% corresponding to 0.3 cm^-1 while systematic errors due to filling of the sample cells become dominant. The high accuracy allows us to systematically investigate the effects of different solvates on water dynamics. Even a single point mutation in a protein can be measured in the THz absorption coefficient in the spectral range from 2 to 3 THz. The system has been recently used to study various solvates in liquid water like sugars and prototype proteins in aqueous buffer solutions in dependence of temperature, pH values, and denaturants. These studies are now augmented by time-resolved measurements using THz time-domain spectroscopy to analyze the kinetics of protein folding. We also discuss other THz sources and detection methods including the investigation of coherent synchrotron radiation at the synchrotron ANKA in Karlsruhe.

Citation Download Citation

Erik Bründermann, Benjamin Born, Stefan Funkner, Matthias Krüger, and Martina Havenith "Terahertz spectroscopic techniques for the study of proteins in aqueous solutions", Proc. SPIE 7215, Terahertz Technology and Applications II, 72150E (9 February 2009); https://doi.org/10.1117/12.808270

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available