Can my sample be contaminated by grease on a rotary evaporator?

[Cyrus the great]

Homework Statement

Before, I started to evaporate my solvent (butanol) by using rotary evaporator, I greased the ground glass joint holding my flask and bump trapper. Subsequently, I secured my flask sample and the trapper with Keck clip . Is there any possibility that my sample may have been contaminated by grease?

Homework Equations

The Attempt at a Solution

 

[Bystander]

using rotary evaporator

There's always something "following" you around --- you "adapt/learn to live with it."