In Situ Monitoring of Lopinavir Protective and Therapeutic Influence as a Potent Drug on Coronavirus Disease–2019 (COVID–19) Infection by Attenuated Total Reflectance–Fourier Transform Infrared (ATR–FTIR Fingerprint) Biospectroscopy.

Lopinavir is an antiretroviral of the protease inhibitor class. It is used against HIV infections as a fixed–dose combination with another protease inhibitor, ritonavir (lopinavir/ritonavir). In the current research, the stimulated ATR–FTIR biospectroscopy of liquid sample of Lopinavir was investigated. The stimulated ATR–FTIR diffractions emitted through focusing the second harmonic laser beam Nd:YAG into the sample were recorded by Echelle spectrometer and ICCD detector. Increasing the energy of laser beam from 2.6 (mJ) to 16 (mJ) was led to increase in stimulated ATR–FTIR signal but after breakdown threshold of liquid sample, more increasing of energy was led to decrease in stimulate ATR–FTIR signals and for energies higher than 20 (mJ), they were disappeared.