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Table 2 Relation between character of nonionic surfactants and cell catalytic activity

From: Nonionic surfactants and their effects on asymmetric reduction of 2-octanone with Saccharomyces cerevisiae

Surfactant Hydrophobic end Hydrophilic end Yield (%) Viability (%) RGlc (%) OD260 nm OD280 nm
Emulsifier OP-6 C14H21 (OC2H4)6OH 88.4 87.5 100 0.19 0.28
Emulsifier OP-8 (OC2H4)8OH 74.9 88.9 100 0.22 0.45
Emulsifier OP-10 (OC2H4)10OH 73.3 88.5 100 0.26 0.63
Emulsifier OP-12 (OC2H4)12OH 65.3 87.1 100 0.27 0.71
Tween 60 C17H35CO (OC2H4)5OH × 3 56.6 62.7 100 0.12 0.27
Tween 80 C17H33CO 57.9 75.0 100 0.14 0.32
Tween 40 C15H31CO 60.6 67.5 100 0.17 0.38
Tween 20 C11H23CO 93.2 72.2 100 0.21 0.56
  1. Cultural condition: 10 g L−1 glucose; 150 g L−1 wet cell; 0–2.0 mmol L−1 surfactants; 20 mL Tris–HCl buffer (50 mmol L−1, pH8.0); 32 °C; 200 r min−1; anaerobic; 24 h
  2. Determination condition: 10 g L−1 glucose (10 mL); 100 g L−1 wet cell; aerobic; 32 °C; 200 r min−1; 4 h
  3. Reaction condition: 0.2 g glucose; 150 g L−1 wet cell; 0.4 mmol L−1 surfactants; 20 mL Tris–HCl buffer (50 mmol L−1, pH 8.0); 32 °C; 200 r min−1; anaerobic; 24 h
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