Pipetting tools are one of the indispensable instruments for completing high school biological experiments. Traditional pipetting tools include beakers, graduated cylinders, pipettes, etc. With the rapid development of science and technology, the experimental content and methods have undergone earth-shaking changes. Traditional pipetting tools have been unable to meet the high school biological experiment requirements. The advent of micro-adjustable pipettes has greatly solved the current teaching problems.
The micro-adjustable pipette (hereinafter referred to as "pipette"), also known as "pipette", is a new type of pipetting tool specially developed for high school biological experiment teaching. Compared with traditional pipetting tools, it is more micro, fast, and accurate, which effectively reduces human operation errors. With the implementation of the new curriculum reform, many new experimental contents have been added, such as plant tissue culture experiments and molecular biology experiments. The liquid that needs to be removed can even reach a few microliters, which cannot be done by traditional pipetting tools. Pipettes play an irreplaceable role in high school biological experiments, and are quietly entering every biological laboratory across the country.
The micro-adjustable pipette is mainly divided into two specifications, one is the micro-adjustable pipette for teachers, and the other is the micro-adjustable pipette for students. The pipette used by teachers is different from the pipette used by students. First, the pipette used by teachers is adjusted by digital window, and the adjustment place is equipped with an orange "locking ring". After adjustment, it acts as a fixed value. The design guarantees the accuracy of pipetting, and students use pipettes to adjust the scale window. Another big advantage is that the pipettes used by teachers are made of high-end plastic materials, which can be sterilized at 121 ° C under high temperature and high pressure, and can also be irradiated with ultraviolet rays. However, the pipette for students cannot perform two operations. In short, the use of pipettes by teachers is more accurate, and the applicable experimental content is more extensive.
The micro-adjustable pipette also needs a matching tip and tip box to use. The tips are mainly divided into four specifications. Only the tips of the pipettes with a maximum range of 5ML can be reused after being cleaned with an ultrasonic cleaner. The other three tips cannot be used repeatedly. Each time you suck, you need to replace it with a new one. Tips to avoid cross-contamination of the experiment.
Micro-adjustable pipette structure:
? Main part (plastic case)
? Adjustment part (combination knob for liquid and scale adjustment)
? Liquid taking part (combination knob for liquid taking and scale adjustment)
? Drop tube part (drop tube button)
How to hold the micro-adjustable pipette:
Hold the main part of the pipette with a four-finger ring, put the thumb on the adjustment button
Above the button, the withdrawal button is directly in front of the body.
How to use the micro-adjustable pipette:
? Choose the right micro adjustable pipette
? Capacity setting:
? Tip installation:
The correct installation method is called the rotary installation method. The specific method is to insert the tip of the pipette into the tip, and while gently pressing hard, the pipette in the handle rotates 180 degrees counterclockwise. Remember not to use too much force, let alone use the method of chopping tips to install.
? Aspirate:
Adopting forward pipetting method (one-stage suction and two-stage row). Press the adjustment button down, the first resistance encountered is defined as "first gear", and then the second resistance encountered is defined as "second gear", according to this method to complete the liquid absorption.
? Drain:
When dispensing, the tip is close to the wall of the container, first press the suction button to the first gear, after a short pause, then press to the second gear, this can ensure that there is no residual liquid in the tip.
? Remove the tip:
Press the push button of the pull-off tube to remove the tip. The removed tip must not be mixed with the new tip to avoid cross-contamination.
Precautions for use of micro-adjustable pipette:
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