“…MTT absorbance was measured at 570 nm using a microplate reader (ELX800; BioTeK, Winooski, VT). C=C, and C-O, respectively (Elzein, Nasser-Eddine, Delaite, Bistac, & Dumas, 2004;Nadri, Nasehi, & Barati, 2017). For PPY spectra, the bandʼs absorption was located at 3,414, 1,546, 1,461, and 1,292 cm −1 , which are related to N-H, C=C, C-C, and C-C/C-N stretching vibrations, respectively (Su, Li, Yuan, & Yi, 2012).…”