Jump to navigation jump to search. Test solution transfer about 500mg of choline bitartrateaccurately weighedto a centrifuge tubeadd 20mlof waterand swirl to dissolveadd 05mlof potassium chloride solution 75in 25centrifugeand transfer 10mlof the supernatant to a 24 mlscrew capped vialdry at 120 for 2hoursadd 400mg of 35 dinitrobenzoyl chloride.
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