Berberine hydrochloride bulk drug analysis and detection method
A technology of berberine hydrochloride and detection method, which is applied in the field of analysis and detection of berberine hydrochloride raw materials, achieving remarkable economic and social benefits
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[0056] 3.1 Analysis of impurities in industrial ortho-vanillin
[0057] 3.1.1 HPLC analysis
[0058] (1) Preparation of standard stock solution
[0059] Accurately weigh 25 mg each of ortho-vanillin, methyl vanillin, ethyl vanillin and vanillin standard substances, place them in 25ml volumetric flasks, dissolve and dilute to the mark with chromatographically pure acetonitrile, and shake well to obtain The corresponding standard stock solution has a concentration of 1mg / ml and is stored in a refrigerator at 4°C.
[0060] (2) Preparation of mixed standard intermediate solution
[0061] ① Precisely measure an appropriate amount of standard stock solutions of methyl vanillin, ethyl vanillin and vanillin, place them in a 10ml volumetric flask, dilute to the mark with acetonitrile, and shake well to obtain a mixed standard intermediate solution with a concentration of 100, 10, 1, 0.1, 0.01, 0.001, 0.0001 μg / ml, stored in a 4°C refrigerator.
[0062] ② Precisely measure an appropri...
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