Advanced Recovery Strategies for Herbal Bioactives from Pharmaceutical Nanoformulations: A Narrative Review
摘要
Bioactive agents from natural sources, particularly plant secondary metabolites are an important class of biologically active compounds; however, they exhibit low water solubility, chemical instability, and variable bioavailability. Consequently, pharmaceutical nanoformulations have been extensively employed to enhance the stability, solubility, and performance of these phytochemicals. While nanocarriers effectively address delivery challenges, they introduce significant analytical difficulties, complicating quality control and quantification. Direct quantitation of encapsulated herbal bioactives in intact nanoformulations is not feasible, as the analytes are masked by the nano-carrier matrix and undergo matrix interference during chromatographic analysis. It is therefore a prerequisite to perform analytical extraction to release the bioactive, allowing for the accurate determination of critical quality attributes, such as total drug content and entrapment efficiency. Nonetheless, high-affinity carrier–bioactive interactions, co-extraction of excipients, and phytochemical instability, while disrupting the matrix, often result in analytical bias due to partial recovery. This narrative review focuses on advanced recovery strategies for the analytical extraction of herbal bioactives from pharmaceutical nanomaterials, with particular emphasis on extraction and sample-preparation steps before chromatographic quantification. Based on the classification, recovery approaches include solvent-based, physical disruption-assisted, chemical, pH-responsive, and enzymatic methods. The review emphasizes that recovery behavior depends on the formulation, which significantly impacts analytical stability and chromatographic compatibility. It underscores the necessity for validation-oriented recovery frameworks to ensure efficient quality control and regulatory assessment.
Graphical Abstract