Researchers using air displacement pipettes often encounter drop formation at the end of the pipette tip after dispensing. What is not general knowledge is that this drop belongs in the dispense and not on the tip.
A tip touch, or touch-off, is a frequently used technique for removing any drops. To achieve this, the vessel's side can be touched with the tip to remove the drop.
The tip is often kept on the vessel's side during dispensing and then slid back up along the wall. The surface of the dispensed liquid can immediately be touched after dispensing, which will also remove the drop.
However, if the tip opening is completely submerged after dispensing, there is usually no need for a touch-off, as the drop will remain in the dispensed liquid once the tip is removed.
How to use a pipette: Touch off
Video Credit: INTEGRA Biosciences
About INTEGRA Biosciences
INTEGRA provides innovative solutions for Liquid Handling and Media Preparation applications which serve the needs of their customers in research, diagnostics and quality control laboratories.
Their instruments and plastic consumables are developed and manufactured in Zizers, Switzerland and Hudson, NH USA. In order to remain close to their customers, they maintain a direct sales and support organization in North America, the UK, France and Germany, as well as a network of over 100 highly trained distribution partners worldwide.
In recent years they have focused on developing a new and technologically advanced range of handheld electronic pipettes which are simple to use and meet the ergonomic needs of their customers.
Today they are proud to offer the widest range of electronic pipettes in the market spanning a range from single channel pipettes up to 384 channel bench-top instruments.
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