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A precise and selective high-performance liquid chromatographic (HPLC) method with diode-array detection for quantifying huperzine A in formulated products was developed and validated. A liquid chromatographic-mass spectrometric (LC/MS) procedure was devised to confirm the HPLC method. Huperzine A was dissolved in 1,2-dichloroethane, chromatographed on a(More)
compositions were found to have an enhanced remanence at the nanocrystalline state. To produce samples with different grain sizes two heat treatment on the nanocrystalline ribbons were performed. The first heat treatment was accomplished during the ac-susceptibility measurement at 700°C for 30 mnutes. The second heat treatment was performed at 1000°C for 15(More)
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