Positive displacement tips are designed to dispense liquids with high vapor pressure and viscosity. They are available in sterile and non-sterile varieties and can be used with a wide range of stepper pipettes. Positive displacement tips are a great way to minimize contamination and are used with liquids that are difficult to dissolve in a conventional pipette. This article describes how to select the best positive displacement tips for different applications.
When using positive displacement pipetting, a syringe-like tip is used. Instead of introducing an air cushion, a piston goes to the bottom of the tip and expels the liquid. At the same time, it wipes the tip walls clean. Positive displacement eliminates cross contamination between samples. Positive displacement pipettes are disposable. Positive displacement pipetting eliminates the need for sterile gloves and a reusable piston. The pipette tips are made by a device called pipette tip mold, which could manufacture different sizes and types of pipette.
A positive displacement pipette does not use an air cushion, which means the liquid will not evaporate or leak. The CP tip is disposable, as is the positive displacement pipette. Positive displacement pipettes work similarly to air displacement pipettes. They are attached to a CP tip and held vertically. Then the tip is inserted into the sample, dispensed, and ejected. If the sample is too viscous to dispense, the pipette should be removed.
GEB Universal Fit Pipette Tips are available in many different sizes, from 10ml to 300ml. They are also available in filtered and low binding options. These tips are autoclavable and are made to fit the most popular brands of pipettors. You can choose to purchase them in bulk or sterile reload. Regardless of the size, you can be sure that you'll get the same high-quality, reliable results every time.
GEB's patented techniques are also highly advantageous. They allow for a higher seal effect for robotic systems and require less insertion force than other pipettes. These tips feature exclusive GEB technologies such as TWC Thin Wall Crown and R&R Low Retention, which optimize the cooperation between tip and pipettor. When purchasing a GEB pipette tip through an agent, they must pay a 100-CNY deposit. This deposit is refundable if you're unsatisfied with the service.
The Fisherbrand polypropylene blue pipette tips are designed to fit a variety of micropipettors, including the Finn, Brand, and Socorex Graduated pipettes. These tips are available in bulk bags of 1000 tips each. These tips fit almost all 1mL pipettes. Approximately 4% of blue pipette tips have a reference mark, which is good quality control. These tips are safe for sensitive applications and are available at a promotional price.
These single-use micropipettes have knurled thumb wheels that rotate to draw up and dispense liquid. This micropipette also has a molded chuck that collects the silicon rubber. This pump is easily disassembled for thorough cleaning. Its color-coded tips match Eppendorf pipette control buttons, making them easy to identify. They are also color-coded according to volume and are easy to attach to the pipette.
The different kinds of dental procedures require different pipettes. The disposable type of pipettes is most suitable for dispensing liquid without precision. Disposable pipettes are rarely used in lab work and should be used only one time. It is advisable to sterilize these pipettes after each use. And, of course, sterile instruments are best for sensitive areas such as the mouth and the gums. This will ensure the safety of patients.
Whether autoclavable or not, micropipettes should be sterilized after use, particularly for sensitive liquids. When sterilizing, the temperature should be about 120degC for approximately fifteen minutes. Then, the pipette should be allowed to dry before use. After sterilization, it should be stored at room temperature for a couple of hours. Then, it should be washed with distilled water and dried properly.
Micropipettes vary in their size. Some deliver a fixed volume while most come with variable volume settings. Most come with a lower and upper limit on the measurement range. While attempting to disperse less than the lower range will result in inaccurate liquid measurements, attempting to dispense more than the upper range will cause liquid to enter the pipette body and tip. And, for some applications, a variable volume micropipette is the perfect tool for experiments with very small samples.
Micropipettes work on the same principle as a conventional pipette: a fluid is dispensed by rotating the plunger. By slowly releasing the plunger, liquid is aspirated into the tip. This is a three-step process, with three tiny steps. Once the liquid has been dispensed, the plunger is withdrawn. The plunger has an ejection system to allow the pipette tip to be removed.