Dry heat treatment induced composites of ceramide NP and high amylose maize starch nanoparticles for enhanced aqueous dispersibility and Pickering emulsion stabilization

초록

To enhance the aqueous dispersibility of ceramide (Cer) NP, composites were prepared with high amylose maize starch nanoparticles (HSNP) using dry heat treatment. Differential scanning calorimetry results indicated that dry heat treatment at 120 degrees C for 120 min minimized the recrystallization of Cer NP in the presence of HSNP. Cer NP (2, 4, and 10 mg) were mixed with 100 mg of HSNP, and the mixture and subjected to optimized dry heat treatment to form composites. For all Cer NP concentrations, dry heat treatment shifted FT-IR peaks from 1613 to 1649 cm-1 and from 1560 to 1545 cm-1, while reducing the melting enthalpy of Cer NP in the composites. X-ray diffraction patterns revealed peaks at 17 degrees and 22 degrees, corresponding to the B-type crystalline structure and V6 amylose allomorph, respectively. The composites exhibited a spherical morphology with a mean hydrodynamic diameter of approximately 120 nm. The composite produced an aqueous dispersion containing up to 0.4 % Cer NP. The hydrophobicity of the composites increased with increasing Cer NP content. When the Pickering emulsion was stabilized by the composite with 10 % Cer NP content, the homogenous phase was maintained for 72 h, exhibiting minimal growth in emulsion droplet size.

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