Internal standrad ; HPLC

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winzzz's picture
Internal standrad ; HPLC

assay   minoxidil (raw material) ---> HPLC method

Q; internal standard preparation ---->  grade of chemical
medroxyprogesterone acetrate ; I must use analytical grade of chemical???
or I can use any grade (such as injection raw materail , USP referance stadard) 

thank you very mush

Santosh@India's picture
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