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In this paper, the lamellar liquid crystals formed in S1570-Brij97/isopropyl myristate/PEG400 aqueous system were prepared at 37 °C. The effects of PEG400 and curcumin on the S1570-Brij97 lyotropic liquid crystal systems were studied by phase diagram, polarized optical microscopy, small angle X-ray scattering, and rheology. The prepared lamellar liquid crystals show stable structures at 37 °C. The encapsulation of curcumin improves the structural stability of the lamellar liquid crystals, which can be confirmed by their higher  ηγ =0.013  and  σy    values, suggesting that the S1570-Brij97 lamellar liquid crystals are good carriers for curcumin. In addition, the prepared lamellar liquid crystals can effectively protect curcumin from decomposition, and curcumin can be released slowly in the liquid crystals. Therefore, based on the structural stability, protective effect on curcumin, and slow-release behavior, the constructed S1570-Brij97 lamellar liquid crystals have good potential for drug delivery.

Lamellar liquid crystals formed from sucrose ester and Brij97 solutions for curcumin delivery