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Transfer sample containing up to 40 µg of protein to test tubes and bring volume up to 200 µL with H2O.
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Add 1 mL of mixture and mix well with the Vortex.
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Incubate for 10 minutes.at Room Temperature.
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Add 50 µL of Folin reagent, mix well with Vortex.
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Incubate for 30 minutes at Room Temperature.
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Read at 540 nm against an H2O blank.