pipetteren

Pipetteren refers to the use of a pipette to transfer precise volumes of liquid. It is a fundamental technique in many laboratory disciplines, including molecular biology, chemistry, and clinical diagnostics. The goal is to achieve accurate and repeatable liquid handling, enabling quantitative measurements and consistent sample preparation.

Pipettes come in manual and electronic forms and are often used with disposable tips to prevent cross-contamination. The common class is the micropipette, available as air-displacement types for general use and positive-displacement types for viscous or volatile liquids. Ranges vary, and different models allow setting specific volumes within a defined accuracy.

Basic technique involves selecting the correct volume, attaching a fresh tip, and pre-wetting the tip by aspirating and dispensing a small amount of liquid. With a smooth, controlled motion, the operator depresses the plunger to the first stop to aspirate, then to the second stop to dispense. The tip should remain vertical, tip immersion depth appropriate for the liquid, and bubbles must be avoided. After dispensing, the tip is ejected into waste to prevent contamination. Proper technique includes handling tips and instruments to minimize vibration, temperature effects, and dead volume.

Calibration and quality control are essential to ensure accuracy and precision. Regular calibration, maintenance, and verification against known standards help detect drift or wear. Common sources of error include liquid viscosity, temperature differences, improper tip fit, and air gaps.

Pipetteren supports a wide range of applications, from routine sample preparation to high-sensitivity assays, and is integral to modern laboratory workflows when performed with proper technique and controls.