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Table 4 Demulsification performance on W/O (Tween–kerosene) and O/W (Span–Tween–kerosene) model emulsions by the crude biosurfactants (cell-free broth)

From: Yeasts and bacterial biosurfactants as demulsifiers for petroleum derivative in seawater emulsions

Biosurfactant producers Model emulsions demulsification (%)a
W/O O/W
C. sphaerica 90.0 ± 0.9 94.7 ± 0.4
C. lipolytica (a) 38.2 ± 0.9 35.7 ± 0.4
C. lipolytica (b) 44.0 ± 0.9 45.2 ± 0.9
C. guilliermondii 30.0 ± 0.9 32.0 ± 0.9
P. cepacia 30.0 ± 0.9 33.4 ± 0.8
Bacillus sp. 37.0 ± 0.9 41.0 ± 0.9
P. aeruginosa 35.0 ± 0.9 38.2 ± 0.5
  1. Results are expressed as mean ± pure error
  2. aControl values for the demulsification in the absence of biosurfactants were less than 5%