O C CH CH 2 O C (CH 2)16 CH 3 C CH C H2 H O OH H OH HO O OH O H2 O C CH CH 2 O C (CH 2)16 CH 3 C CH C O CH 2 CH 2 O CH 2 CH 2OH CH2 CH2 O CH 2 CH 2OH Span 60 (sorbitan mono-stearate) Hydrophobic Hydrophilic Tween 60 (polyoxyalkylene sorbitan mono-stearate) Hydrophobic HydrophilicO C CH CH 2 O C (CH 2)16 CH 3 C CH C H2 H O OH H OH HO O OH O H2 O C CH CH 2 O C (CH 2)16 CH 3 C CH C O CH 2 CH 2 O CH 2 CH 2OH CH2 CH2 O CH 2 CH 2OH Span 60 (sorbitan mono-stearate) Hydrophobic Hydrophilic Tween 60 (polyoxyalkylene sorbitan mono-stearate) Hydrophobic Hydrophilic