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

Area of Science:

• Materials Science
• Nanotechnology
• Biochemistry

Background:

• Nano-magnesium hydroxide (Mg(OH)₂) exhibits low toxicity and is a promising nano-carrier for enhancing insecticidal protein bioactivity.
• Understanding the adsorption characteristics of insecticidal proteins onto nano-Mg(OH)₂ is crucial for optimizing its application.

Purpose of the Study:

• To investigate the adsorption behavior of insecticidal protein onto nano-Mg(OH)₂.
• To determine the adsorption capacity, kinetics, and thermodynamic parameters.
• To elucidate the interaction mechanism between the insecticidal protein and nano-Mg(OH)₂.

Main Methods:

• Adsorption isotherm studies using Langmuir and Freundlich models.
• Adsorption kinetics analysis following pseudo-first or -second order rate models.
• Fourier-transform infrared spectroscopy (FT-IR), zeta potential analysis, and circular dichroism (CD) spectroscopy to characterize the adsorption and interaction.

Main Results:

• High adsorption capacity of nano-Mg(OH)₂ for insecticidal protein, reaching 136 mg g^-1.
• Adsorption process is spontaneous and exothermic, with temperature being a critical factor.
• Intermolecular forces, rather than electrostatic interactions, are suggested as the primary mechanism for protein loading, evidenced by zeta potential and CD spectroscopy.

Conclusions:

• Nano-Mg(OH)₂ demonstrates significant potential as a nano-carrier for insecticidal proteins.
• The adsorption process is well-described by established models, and the interaction mechanism provides insights for practical applications.
• Optimized adsorption conditions, particularly temperature control, are essential for effective utilization of nano-Mg(OH)₂ as a carrier.