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. 2016 Apr 14;6(2):13. doi: 10.3390/bios6020013

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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IR spectra of the oil phases containing different amounts of emulsifier. The percentages in the legend are wt % PGPR. The zoomed in region shows the C=O stretching peak. The small peak around 2300 cm⁻¹ is an experimental artifact of the diamond crystal involved in the ATR measurement. The zoomed in region in the circle shows the isosbestic point at 1735 cm⁻¹.