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To reduce interference with the dissolution of formazan crystals in the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay, we conducted a systematic investigation to study the effects of various buffers, HCl, NaOH, and ammonia. As a result, we identified an improved solvent, alkaline dimethyl sulfoxide (DMSO) containing 8 to 800 mM ammonia, which could dissolve formazan crystals in approximately 10 min so as to give a stable spectrum by eliminating buffering effects of the residual medium. Copyright © 2011 Elsevier Inc. All rights reserved.

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Hengwei Wang, Fengqing Wang, Xinyi Tao, Hairong Cheng. Ammonia-containing dimethyl sulfoxide: an improved solvent for the dissolution of formazan crystals in the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Analytical biochemistry. 2012 Feb 1;421(1):324-6

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PMID: 22100715

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