Multifunctional green supramolecular solvents for cost-effective production of highly stable astaxanthin-rich formulations from Haematococcus pluvialis

•A novel combination of supramolecular solvents and nanostructured lipid carriers.•Astaxanthin from H. pluvialis powder is extracted, encapsulated and stabilized.•Spherical SUPRAS-NLCs of ∼100 nm were obtained.•Antioxidant and in vitro ROS scavenging properties are preserved and even enhanced.•A remarkable time stability of at least 180 d at 4 °C is guaranteed.