Al molar ratios of 2:1, 3:1, and 4:1) and lactate (Lc) as counteranion were synthesized by coprecipitation using 0:1 and 3:1 lactic acid:Al molar ratios to prepare the starting solutions. Their physicochemical properties were studied by element chemical analysis, powder X-ray diffraction, infrared spectroscopy, and thermal analyses. Powder X-ray diffraction showed a pattern characteristic of a hydrotalcite-like structure. FT-IR spectroscopy confirmed the retention of the lactate anions in the interlayer without further contamination. Thermal analyses showed four stages of weight loss and five of heat change when recorded under oxidizing conditions. Dispersion of the dried samples in decarbonated water by ultrasound-assisted treatment at room temperature led to delamination of all wet fractions. Upon solvent evaporation, dried fractions restacked with a higher crystallinity and an increase in basal spacing.

Layered double hydroxides containing Ni 2+ and Al 3+ have been synthesized by homogeneous precipitation through urea hydrolysis. The nature of the interlayer species changes according to the treatment of the samples, formation of interlayer (NH 2 )COOspecies being observed immediately after precipitation, which undergo transformation to carbonate after hydrothermal treatment. Simultaneously, liberation of ammonia during decomposition under hydrothermal conditions gives rise to formation of [Ni(NH 3 ) 6 ] 2+ species in solution.

Phenylalanine, isocoumarin and Ochratoxin A (OTA) have been intercalated within the interlayer space of layered double hydroxides. Synthesis of these nanocompounds was achieved via co-precipitation. Their physicochemical properties were studied by element chemical analysis, powder X-ray diffraction, infrared spectroscopy and thermal analyses. The presence of OTA in the interlayer is demonstrated by the study of LC-FD Analysis. On the other hand, these studies allow to check how some of the toxin is on the surface of the nanocomposite.