Açaí-Loaded Nanoemulsion: Synthesis, Characterization, and In Vitro Safety Profile

Background: Natural products have been used worldwide as alternatives to treat or prevent different chronic diseases. Euterpe oleracea Mart. (açaí) has bioactive molecules in its chemical matrix, such as epicatechin, apigenin, and cyanidin-3-O-rutinoside. These molecules guarantee açaí’s antioxidant, anti-inflammatory, and antitumor potential. Açaí’s chemical matrix is susceptible to degradation. Nanocarriers are appropriate to use with NP. The aim of this study was to produce, characterize, and analyze the in vitro safety profile of a nanoemulsion (NE) containing açaí extract. Methods: Different NEs were prepared with açaí extract (0.83–20 mg/mL). A characterization was performed considering physical–chemical parameters and a morphological analysis. The most stable NE was evaluated for in vitro safety in fibroblasts. Fibroblasts were exposed to a concentration curve of NEs for 24 h. Cellular viability and proliferation, the levels of nitric oxide, reactive oxygen species (ROS), and the release of dsDNA were measured. Possible DNA damage was also measured. Results: It was possible to determine that the NE with 4 mg/mL of açaí extract was the most stable under refrigeration, presenting a favorable in vitro safety profile since fibroblasts kept their homeostasis aspects under most of the concentrations tested as well as their DNA integrity. Conclusion: The obtained results show that a stable NE was produced, maintaining the NP antioxidant capacity and non-toxic effects in fibroblasts.