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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The assay of plasma samples by standard spectrophotometry and by the newly developed smartphone camera-based colorimetric assay. A 60 min incubation was chosen for this experiment. Standard error of the mean is expressed for five independent repeats. BChE butyrylcholinesterase.