Centrifugal microfluidic devices using low-volume reagent storage and inward fluid displacement for presumptive drug detection

•Simple liquid reagent storage method using custom capillary ampule fabrication technique.•Low-volume reagent storage amenable for concentrated acids and volatile reagents.•Performed colorimetric detection of methamphetamine, codeine, heroin, cocaine, MDMA and MDA.•Evaluated the ability to move flui...

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