Plasma Protein Binding (PPB) is an important pharmacokinetic criterion which affects the extent of distribution. Complex formed by the drug molecule with plasma protein are pharmacokinetically and pharmacodynamically inert. On the other hand, very low PPB binding have very low volume of distribution that is excreted early thus preventing the desired therapeutic benefit. Compounds showing more than 90% of PPB values are the chemicals strongly bound and ones with less than 90% are the weekly bound. Four steroids respectively Certonardosterol C2, Certonardosterol Q4, Certonardosterol Q5,
Certonardosterol Q7 have shown less than 90% PPB binding which infers them as weakly bound compounds to the plasma