Experimental and theoretical analyzes on structural and spectroscopic properties of monomer and dimeric form of (S)-Piperidine-2-Carboxylic acid: An attempt on medicinal plant

Spectroscopic characterization and in vitro studies of biological activity of bradykinin derivatives

“…Therefore, it can be assumed that the piperidine ring lies flat on the surface of the AuNPs. This can be confirmed by the bands at 1037 [(CH2) + ipb(CH) + b(ring)], 1047 [(CH2) + b(ring)], 1317 [(CH2)], and 1464 cm -1 [s(CH2)] 16,37 , which are more intense in the SERS spectrum of BK10 than in the SERS spectrum of BK11.…”

“…all, the other two intense bands at 1337 (fwhm = 12 cm -1 ) and 1089 cm -1 (fwhm = 15 cm -1 ) in the spectrum in Fig. 6E are assigned to the (C-C) + /(CH2) + b(CH) and (CH2) + b(CN-) + b(CH) + b(ring) vibrations, respectively 37 . Knowing that (i.)…”

“…In the sequence of each peptide there is a Thi residue at position 5; in addition, the analogs of BK7, BK10, and BK11 contain Thi at position 8. The vibrations characteristic of the 2-substituted thiophene ring can be assigned to the bands at 1501 (fwhm = 23 cm -1 ), 1458 (fwhm = 18 cm -1 ), 1206 (fwhm = 10 cm -1 ), 670 [oopb(CH), fwhm = 8 cm -1 ], 630 [ipb(ring) + (C-S), fwhm = 9 cm -1 ], 530 [ring deformation + oopb(CH), fwhm = 11 cm -1 )], 498 [ipb(C-CH2)subst, fwhm = 12 cm -1 ], 461 (fwhm = 9 cm -1 ), and 453 cm -1 (fwhm = 10 cm -1 ) in the BK11 SERS spectrum 16,37,38 . The SERS signals at 1501 and 1458 cm -1 are due to the antisymmetric and symmetric (C=C) modes, respectively, conjugated to (CH) 39 .…”

A Raman spectroscopic study of the pyrolysis of lactose and tannins

“…The Raman spectrum of PG at RT is shown in Figure 3b (orange line) and Figure 6 (blue line). Pyrogallol has 39 Raman active vibrational modes, a detailed discussion of which can be found, for example, in Selvaraj et al 63 …”

“…The Raman spectrum of PG at RT is shown in Figure 3b (orange line) and Figure 6 (blue line). Pyrogallol has 39 Raman active vibrational modes, a detailed discussion of which can be found, for example, in Selvaraj et al 63 Additionally, Figure 6 shows PG peak positions calculated by DFT. They are indicated by vertical blue lines below the spectrum, where solid lines mark intense peaks (relative intensity over 50%), dashed lines mark peaks of medium intensity (10%-50%), and dotted lines mark weak peaks (below 10%).…”