Figure 1 | Scientific Reports

Figure 1

From: Micro-Fourier-transform infrared reflectance spectroscopy as tool for probing IgG glycosylation in COVID-19 patients

Figure 1

Scheme for micro-FTIR reflectance measurements for human serum. One µL of diluted (1 : 3 in ultra-pure water) serum sample solution (1) was transferred to a circular platinum sample holder (2). Then the sample holder was installed in a desiccator with saturated solution of NaCl (3) which controls the relative moisture in 80%. The drying time was 10 min. After this period the sample holder was installed on the FTIR reflectance accessory of the micro-FTIR spectrometer. The IR beam (4) passing through the IR \(60\times \) magnification Cassegrain lens (5) focuses the light on a given sample (6). The reflected light is collected by the same lens and analyzed by the spectrometer.

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