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An updated minireview of chiral stationary phases (CSPs) based on amino alcohols is presented. In this minireview, we focused on amino alcohols as starting materials in preparation of chiral catalysts for asymmetric organic synthesis and CSPs for chiral separations. Among the various CSPs, we summarized the important developments and applications of the amino alcohol‐based Pirkle‐type CSPs, ligand exchange CSPs, α‐amino acid‐derived amino alcohol CSPs, and symmetric CSPs from their first appearance to the present day to propose ideas for the development of new CSPs with improved performance.

Stainless steel (SS) and polyether ether ketone (PEEK) C18 columns were submerged in an ultrasonic bath operating at a frequency of 36 kHz to separate a mixture of polycyclic aromatic hydrocarbons (PAHs), including naphthalene, anthracene, and pyrene, using high‐performance liquid chromatography (HPLC) with ultrasound radiation applied at intensities ranging from 0% to 100% of the 900 W output power. Sono‐gradient elution was used to ultrasonically irradiate the mixture at specific points during the elution to improve the separation factor by increasing the interval between the target peaks and shorten the analysis time by reducing the retention time of the desired PAH peak.

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