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. 2019 Nov 18;26(1):1191–1205. doi: 10.1080/10717544.2019.1689312

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© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Construction of pseudo-ternary phase diagrams based on orthogonal design at 25 °C. (A) Test No.1: limonene (oil), S_mix (Tween 80/Transcutol HP = 2:1, w/w) and water; (B) test No.2: limonene (oil), S_mix (Tween 80/PEG 400 = 3:2, w/w) and water; (C) test No.3: limonene (oil), S_mix (Tween 80/glycerol = 3:1, w/w) and water; (D) EO (oil), S_mix (Tween 80/Transcutol HP = 3:2, w/w) and water; (E) EO (oil), S_mix (Tween 80/PEG 400 = 3:1, w/w) and water; (F) EO (oil), S_mix (Tween 80/glycerol = 2:1, w/w) and water; (G) OA (oil), S_mix (Tween 80/Transcutol HP = 3:1, w/w) and water; (H) OA (oil), S_mix (Tween 80/PEG 400 = 2:1, w/w) and water; (I) OA (oil), S_mix (Tween 80/glycerol = 3:2, w/w) and water. The region of blank microemulsion (without lycopene) is labeled ME. Limonene: (R)-(+)-limonene; EO: ethyl oleate; OA: oleic acid; S_mix: the surfactant and co-surfactant mixture.