Development of a validated method for rapid quantification of up to sixteen cannabinoids using ultra-high-performance liquid chromatography diode-array detector with optional electrospray ionization time-of-flight mass spectrometry detection

•Development of a validated liquid chromatography diode-array detector method.•Rapid quantification of up to sixteen cannabinoids in hemp concentrates.•Recovery of sample preparation tracked in real time by spiking abnormal CBD.•Method specificity verified by time-of-flight mass spectrometry.•High contents of delta-9 THC uncovered in delta-8 THC products.