Interaction between antimicrobial drugs and antacid based on cancrinite-type zeolite

Application of nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, UV–Visible spectroscopy and kinetic modeling for elucidation of adsorption chemistry in uptake of tetracycline by zeolite beta

“…The p-p à transition of the tricarbonyl system of the ring A contributes only to the absorption band at 276 nm; while the p-p à transition of the BCD chromophore contributes to all the absorption bands [22]. These transitions are sensitive to deprotonation and metallic coordination.…”

Study of tetracycline adsorption by Zn-Al mixed oxides and layered double hydroxides

“…The UV/vis absorption spectra of tetracyclines are generally discussed as superposition of the contributions of two separated chromophores [22][23][24]: the first is the so-called A chromophore which comprises a tricarbonylmethane keto-enol system spanning from C1 to C3 including the substituents (O1, carboxamide group at C2 and OH3); the second, usually termed the BCD chromophore, comprises the π-electron system located on rings B, C and D (Fig. 3 a).…”

“…The absorption spectrum, in the UV-visible region, of an acid solution of TC displays three bands centered at 218, 270 and 356 nm. According to [22], the π-π* transition of the tricarbonyl system of the A-ring contributes only to the band at 270 nm while the π-π* transition of the BCD chromophore contributes to all three bands. These transitions are sensitive to deprotonation and metal coordination.…”

The synthesis of mesoporous aluminosilicate using microcline for adsorption of mercury(II)

“…attributed to Lewis acid site [31]. The band around 1741 cm −1 is attributed to the characteristic of water molecules inside the framework, and the bands around 3300 and 3628 cm −1 correspond to OH − groups from water molecules [32]. This is because the samples absorb some water when they are exposed to the air, and this means that the surface of SAR-3 is hydrophilic.…”