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. 2021 Jun 21;26(12):3771. doi: 10.3390/molecules26123771

Table 1.

Molecular structure and classification of sulfate head extended surfactants according to its normalized characteristic parameter (SCPN) [2].

Extended Surfactant 1 σ k SCPN = σ/k * Author and Year Ref.
S/12/6/2/SO4 −1.43 0.075 −19.1 Miñana-Perez, 1995 [13]
S/12/10/2/SO4 −0.3 0.11 −2.7 Miñana-Perez, 1995 [13]
S/12/14/2/SO4 1.21 0.16 7.6 Miñana-Perez, 1995 [13]
A/14−15/8/0/SO4 0.16 0.13 1.2 Witthayapanyanon, 2006 [30]
A/10/18/2/SO4 0.57 0.053 10.8 Do, 2009 [39]
A/14−15/4/0/SO4 −0.18 0.11 −1.6 Velásquez, 2010 [24]
A/16−17/4/0/SO4 −0.29 0.11 −2.6 Velásquez, 2010 [24]
A/12−13/8/0/SO4 −0.52 0.08 −6.5 Velásquez, 2010 [24]
A/12−13/4/0/SO4 −0.98 0.11 −8.9 Velásquez, 2010 [24]
Chen/8/9/3/SO4 −0.39 0.17 −2.3 Chen, 2019 [40]
A/12−13/4/0/SO4 −1.55 0.049 −31.6 Wang, 2019 [41]
He/13/2/0/SO4 −1.8 0.056 −32.1 He, 2019 [42]
A/10/4/0/SO4 −2.24 0.053 −42.3 Phaodee, 2020 [43]

1 Nomenclature: A: Alfoterra, S: Seppic, Chen and He are the first authors of the papers where these surfactants were synthetized. A/10/18/2/ SO4 stands for Alfoterra/C10/PO18/O2/SO4. This is the same nomenclature as [2]. * SCPN is the surfactant classification parameter. Higher SCPN indicates a more important lipophilic part of the molecule (hydrocarbon tail and PO extension); a lower SCPN (more negative) indicates a more important hydrophilic head contribution.