Red-emitting carbon dots as fluorescent probes for the rapid detection of brilliant blue FCF in foods

Environmentally sustainable synthesis of whey-based carbon dots for ferric ion detection in human serum and water samples: evaluating the greenness of the method

“…In Fig. 1B, the following observations were made: stretching vibrations of O-H and N-H in the region 2900 cm −1 to 3400 cm −1 , 59 an absorption peak at 1676 cm −1 corresponding to the stretching vibration of C]O, 60 the absorption peak at 1521 cm −1 attributed to the stretching vibration of C]C, and the peak at 1398 cm −1 identied as C-N, N-H. Additionally, the peak at 1191 cm −1 was ascribed to the C-O, C-N, and C-S bonds. 61 The peak at 1023 cm −1 is assigned to the stretching vibration of S]O.…”