Open AccessGe on Si waveguide mid-infrared absorption spectroscopy of proteins and their aggregates
Author(s) -
Vinita Mittal,
George Devitt,
Milos Nedeljkovic,
Lewis G. Carpenter,
Harold M. H. Chong,
James S. Wilkinson,
Sumeet Mahajan,
Goran Z. Mashanovich
Publication year - 2020
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.398013
Subject(s) - spectroscopy , infrared spectroscopy , bovine serum albumin , infrared , germanium , absorption (acoustics) , absorption spectroscopy , silicon , materials science , amyloid (mycology) , chemistry , biophysics , optics , optoelectronics , biology , biochemistry , physics , organic chemistry , quantum mechanics , composite material , inorganic chemistry
Specific proteins and their aggregates form toxic amyloid plaques and neurofibrillary tangles in the brains of people suffering from neurodegenerative diseases such as Alzheimer's and Parkinson's. It is important to study these conformational changes to identify and differentiate these diseases at an early stage so that timely medication is provided to patients. Mid-infrared spectroscopy can be used to monitor these changes by studying the line-shapes and the relative absorbances of amide bands present in proteins. This work focusses on the spectroscopy of the protein, Bovine Serum Albumin as an exemplar, and its aggregates using germanium on silicon waveguides in the 1900-1000 cm -1 (5.3-10.0 µm) spectral region.