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. 2020 Jun 8;11(6):577. doi: 10.3390/mi11060577

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© 2020 by the authors.

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/).

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Analysis of the droplet composition accuracy regarding to the desired programmed composition. One-dimensional program with stepwise varied concentrations of a reporter dye (cochineal red A). A sequence with about 1700 segments was generated and the dye concentration determined by absorbance measurement using the photo-fluorimetric sensor module. (A) fluidic program (expected value, solid line) and measured value (blue dot line) for the droplet generation in 33 concentration steps; (B) detailed cutout of programmed (solid line) and measured values (dot line).