Determination of degree of substitution for N-acylated chitosan using IR spectra chitinchitosanN-acylated chitosanChitosans with various degrees of deacetylation (D.D.), which were used as standard sample for FTIR determination, were prepared from completely deacetylated chitosan by homogeneous N-...
The FTIR spectra of chitosan, collagen, hydroxyapatite are shown in Fig.3. The characteristic absorption bands of chitosan are observed: the vibration band at 3266 cm−1corresponding to the N–H stretching and –OH attributed to inter and intra-molecular hydrogen bonding, an absorption band a...
In terms of chemical structure, FT-IR spectroscopy was used to characterize the functional groups. The FTIR spectra of chitosan, chitosan nanoparticles andCympopogon citratusaqueous extract were investigated. Significant shifts in the peaks of the FTIR spectrum of CNPs when compared to the peaks of ...
FTIR spectra of biocomposites confirmed strong hydrogen bonding between chitosan and hydroxyl groups of viscose rayon. The SEM micrograph indicated that the viscose rayon filament was fully surrounded by the matrix, and hence a strong composite was fabricated....
Overall, the FTIR spectra aided to confirm the presence of chitosan molecules in the CHCLAFs. The XRD measurements were performed in order to investigate the microstructural changes in the CHCLAFs caused during processing. XRD patterns of MCC, CHP, CLF and blended aerogel microfib- ers are ...
FTIR spectra were recorded at a spectral resolution of 4 cm−1 in the range (400–4000) cm−1. 2.5. Water solubility, equilibrium moisture content and water vapor permeability Water solubility of the samples was confirmed using the gravimetric method of immersion in a determined volume of ...
Photographs of solutions of BTL-11 and BTL-11@NSCS NPs 2 mg/mL in water (A) and NSCS aqueous solution (B); TEM images of NSCS (C) and BTL-11@NSCS NPs (D,E); Elemental mapping (F–I) and EDS (J) of BTL-11@NSCS NPs; FTIR spectra (K) of CS and NSCS ...
FTIR spectral analysis is important in identifying the different functional groups present on the surface of biosorbent which are responsible for the binding of metal ions. FTIR spectra in the range of 4000–500 cm−1 for the CCB before and after biosorption of Cd(II) are shown in Fig. 1...
2.6. FTIR spectroscopy The IR spectra of CS, RG and CH/RG PEC were recorded in the solid state after freeze-drying a pellet of the isolated nanoparticles, using KBr pellets in a Shimadzu IR spectrometer (model 8300) operating at between 400 and 4000 cm⿿1. 2.7. SEM imaging The morpholo...
The ATR FT-IR spectrum of raw chitosan was compared with spectra of hydrogels prepared with the selected gelation media (Figure S4, Supplementary Materials). The transmittance spectrum of hydrogels prepared with KOH showed a broad widening of the O-H stretching band19, masking the stretching vibrat...