What’s Haunting Your Pipetting Results?

Before blaming the reagents, consider what might be lurking in your pipetting routine. Small liquid handling errors can change reagent concentrations and reaction conditions, making it harder to distinguish a biological finding from a procedural mistake. Even experienced scientists can develop habits that quietly undermine reproducibility.

Some of the most common culprits hide in everyday technique. Releasing the plunger too quickly, aspirating at an angle, or immersing the tip too deeply can affect the volume collected. Removing the tip before aspiration is complete can leave you short, while inconsistent dispensing can leave liquid behind. Use a steady rhythm, hold the pipette vertically during aspiration, and follow the recommended immersion depth and waiting time. Also check your pipette’s volume range: a smaller instrument may be more appropriate when working near the lower limit of a larger pipette.

Your sample’s properties can introduce another layer of mischief. Viscous liquids may aspirate slowly or remain inside the tip, while volatile liquids can evaporate into the air cushion of an air displacement pipette and cause dripping. Temperature differences between the liquid and instrument can also alter delivered volumes. Match your method to the sample: slower aspiration, longer waiting times, or reverse pipetting may help with challenging liquids. Pre-wetting can improve consistency under suitable conditions, but temperature-sensitive workflows require particular care—follow application-specific guidance rather than treating every sample like water.

A poorly seated tip is another quiet troublemaker: an inadequate seal can cause leaks and inaccurate transfers. Confirm tip compatibility and secure attachment before starting. Make tip changes, contamination control, cleaning, and routine performance checks part of your laboratory’s standard procedures. When results begin to drift, reviewing both technique and instrument condition provides a practical starting point for the investigation. A little attention at the bench can help keep unexplained variability from becoming a recurring laboratory horror story.

Reliable pipetting starts with sound technique, supported by equipment suited to the task. For laboratories evaluating their tools, BRANDTECH Scientific’s Transferpette® pro pipettes offer an adjustable finger rest for comfort and control, along with temporary User Adjustment for defined changes in liquid properties, temperature, or tip type. Explore the Transferpette® family of pipettes to learn how these features can support your daily workflow—and help keep pipetting problems from haunting your next experiment.