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. 2018 Sep 4;6:379. doi: 10.3389/fchem.2018.00379

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Copyright © 2018 Singh and Tavana.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Schematic of collagen partition experiment in ATPS. (B) Quantification of collagen concentration using hydroxyproline assay. Error bars represent standard deviations. (C) Collagen partition assay containing equal volumes of 15% PEG35k, 21% DEX500k, and 2 mg/ml collagen results in formation of 5% PEG-7% DEX ATPS.