Ir affinity 1model

A Shimadzu FTIR spectrometer was used to study the FTIR spectrum (IR Affinity 1Model, Kyoto, Japan). Cytarabine, TINPs, and cytarabine-loaded TINPS were tested and scanning range was set between 4000 and 500 cm⁻¹.

The degree of conversion of the experimental groups was analyzed by Fourier transform infrared spectroscopy (FTIR; IRAffinity-1 Model, Shimadzu, Kyoto, Japan) in attenuated total reflection (ATR) mode. The DC% was measuring by change of height of the band at 1638 cm⁻¹ (corresponding with the aliphatic carbon double bond absorbance). The aromatic carbon double bond absorbance at 1608 cm⁻¹ was used as standard control. Each sample spectrum was acquired with 64 scans, resolution of 4.0 cm⁻¹ and using the absorbance mode. Disc-shaped samples were made with the aid of a stainless metallic matrix (h = 1.0 mm, Ø = 5.0 mm) and then were photoactivated for 20 s, as describe previously. Were analyzed non-polymerized samples (n = 3), immediately polymerized samples (n = 3) and samples with 24 h after polymerization (n = 3) to each experimental group and theirs respective FTIR spectra were obtained. The degree of conversion was calculated as follows: $\left(\text{DC\%}\right)=\left[1-\left(\left({\text{R}}_{cured}\right)/\left({\text{R}}_{uncured}\right)\right)\right]]\text{x }100$ where: R = (band at 1638 cm⁻¹)/(band at 1608 cm⁻¹).