A green method for preparation of amino acids functionalized 2,3-dialdehyde cellulose

Development of Novel Natural Deep Eutectic Solvent for Cellulose Nanofibrillation of Orange Peel via New Surface Functionalization

“…The peak at 1737 cm –1 is ascribed to the CO stretching vibration of carboxylic acid in lignin or ester groups in hemicellulose. In addition, the small peaks at 1508 and 1261 cm –1 are ascribed to the CC stretching vibration of aromatic rings and acetyl groups in lignin, respectively. , The disappearance of the peaks at 1737, 1508, and 1261 cm –1 in the OCell spectra (after NaHCO 3 alkaline treatment and the bleaching step by H 2 O 2 ) ensures the efficiency of NaHCO 3 and H 2 O 2 to remove lignin and hemicellulose from OPs. , For OCell spectrum and treated CNFs, absorption peaks in the regions 3300, 2900, 1413, 1322, and 1023 cm –1 are ascribed to the O–H stretching vibration, the C–H stretching vibration, the CH 2 bending vibration, and C–O stretching vibration, respectively, which are typical characteristic peaks of cellulose. , This demonstrated that the main structure of cellulose was preserved even after being pretreated with DESs. The spectra of all DES-treated CNFs show that a new peak in the region of 1700 cm –1 corresponds to CO stretching vibration of COOH or COO – of tartaric acid .…”

“…43,50 For OCell spectrum and treated CNFs, absorption peaks in the regions 3300, 2900, 1413, 1322, and 1023 cm −1 are ascribed to the O−H stretching vibration, the C−H stretching vibration, the CH 2 bending vibration, and C−O stretching vibration, respectively, which are typical characteristic peaks of cellulose. 51,52 This demonstrated that the main structure of cellulose was preserved even after being pretreated with DESs. The spectra of all DES-treated CNFs show that a new peak in the region of 1700 cm −1 corresponds to C�O stretching vibration of COOH or COO − of tartaric acid.…”