Why Do Carbonate Anions Have Extremely High Stability in the Interlayer Space of Layered Double Hydroxides? Case Study of Layered Double Hydroxide Consisting of Mg and Al (Mg/Al = 2).

Layered double hydroxides (LDHs) are promising compounds in a wide range of fields. However, exchange of CO anions with other anions is necessary, because the CO anions are strongly affixed in the LDH interlayer space. To elucidate the reason for the extremely high stability of CO anions intercalated in LDHs, we investigated in detail the chemical states of CO anions and hydrated water molecules in the LDH interlayer space by synchrotron radiation X-ray diffraction, solid-state NMR spectroscopy, and Raman spectroscopy.

[Methodology for quality control of an ointment with antivaricose properties].

A personal formulation of an ointment with antivaricose properties is presented. A methodology for the physicochemical and rheologic control, including all parameters required by the standards for ointments quality control, was designed. The analyses showed that the ointment is stable in time, has a thixotropic consistency and behaviour and does not require special preservation conditions.

[The physicochemical characterization and therapeutic evaluation of Cicatrol].

Cicatrol ointment with the formula: argentic sulphamethoxydiasine 1 g, bentonite hydrogel 12.5% for 100 g is manufactured at the Microproduction Laboratory of the Faculty of Pharmacy of Iaşi. The one-year physicochemical determinations of the aspect, colour, homogeneity, pH, rheological behaviour and relative viscosity, content in argentic sulphamethoxydiasine as well as "in vitro" antimicrobial activity of Cicatrol showed a good stability and gel properties enabling an uniform and long-term contact with the wound.