The adsorption features between insecticidal crystal protein and nano-Mg(OH)(2)

Nano-Mg(OH)(2), with low biological toxicity, is an ideal nano-carrier for insecticidal protein to improve the bioactivity. In this work, the adsorption features of insecticidal protein by nano-Mg(OH)(2) have been studied. The adsorption capacity could reach as high as 136 mg g(−1), and the adsorption isotherm had been fitted with Langmuir and Freundlich models. Moreover, the adsorption kinetics followed a pseudo-first or -second order rate model, and the adsorption was spontaneous and an exothermic process. However, high temperatures are not suitable for adsorption, which implies that the temperature would be a critical factor during the adsorption process. In addition, FT-IR confirmed that the protein was adsorbed on the nano-Mg(OH)(2), zeta potential analysis suggested that insecticidal protein was loaded onto the nano-Mg(OH)(2) not by electrostatic adsorption but maybe by intermolecular forces, and circular dichroism spectroscopy of Cry11Aa protein before and after loading with nano-Mg(OH)(2) was changed. The study applied the adsorption information between Cry11Aa and nano-Mg(OH)(2), which would be useful in the practical application of nano-Mg(OH)(2) as a nano-carrier.