Method for determining concentration of hydrochlorothiazide, losartan and 5-carboxylic acid losartan in plasma by liquid chromatography-mass spectrometry
A technology of hydrochlorothiazide and LC/MS is applied in measurement devices, instruments, scientific instruments, etc., to achieve the effects of simple pretreatment method, fast method and simple operation.
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[0031] 1. Experimental materials and instruments
[0032] Hydrochlorothiazide, losartan and its metabolite 5-carboxylate losartan and various deuterated internal standards hydrochlorothiazide-13C6, losartan-d4 and 5-carboxylate losartan-d4 were provided by TRC in Canada. Acetonitrile, methanol, acetic acid, ammonium acetate, formic acid, etc. are all of HPLC grade, from the American Fisher Company, and other chemical reagents are of analytical grade.
[0033] LCMS-8060 mass spectrometer (Shimadzu, Japan), Lab Solutions 6.84 SP1 data acquisition software (Shimadzu, Japan), Mettler XS 105DU electronic balance (Mettler, Switzerland); Eppendorf Centrifuge5424R high-speed cryogenic centrifuge ( Eppendorf, Germany).
[0034] Second, the experimental process
[0035] 1. Preparation of stock solution and working solution
[0036] Weigh an appropriate amount of hydrochlorothiazide, losartan and its metabolite 5-carboxylate losartan and various deuterated internal standards hydrochlo...
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