Common pipetting errors in pharmaceutical microbiology include skipping tip pre-wetting, holding pipettes at an improper angle (>20ยฐ), rushing aspiration or fast plunger release, using mismatched or loose tips, and ignoring temperature differences.
These mistakes cause volumetric inaccuracies that directly compromise sterility tests, microbial limit assays, and data integrity.
๐๐จ๐ฆ๐ฆ๐จ๐ง ๐๐ข๐ฉ๐๐ญ๐ญ๐ข๐ง๐ ๐๐ซ๐ซ๐จ๐ซ๐ฌ
- Pipetting error 1: ignoring temperature fluctuations
- Pipetting error 2: inconsistent pipetting angle
- Pipetting error 3: inconsistent manual pipetting practices
- Pipetting error 4: improperly fitting tips
- Pipetting error 5: incorrect volume range
- Pipetting error 6: disregarding liquid viscosity
- Pipetting error 7: ignoring the volatility of a sample
- Pipetting error 8: not discarding the first and last dispenses when repeat dispensing
๐๐จ๐ฐ ๐ญ๐จ ๐๐ฏ๐จ๐ข๐ ๐ฉ๐ข๐ฉ๐๐ญ๐ญ๐ข๐ง๐ ๐๐ซ๐ซ๐จ๐ซ๐ฌ
- Clean and check your pipette daily
- Service your pipette every six months
- Know proper pipetting techniques
- Clean Your Pipette Each Day Before Use
- Store Your Pipette Vertically, Using a Pipette Holder
- Use the appropriate pipette
- Account for environmental conditions
- Let your pipette adjust to the environment
- Take a break
- Use a new tip every time
๐๐๐ฅ๐ข๐๐ซ๐๐ญ๐ข๐จ๐ง & ๐๐๐ข๐ง๐ญ๐๐ง๐๐ง๐๐: ๐๐๐๐ฉ ๐๐จ๐ฎ๐ซ ๐๐ข๐ฉ๐๐ญ๐ญ๐ ๐๐๐ฅ๐ข๐๐๐ฅ๐
Regular pipette calibration is essentialโideally every 6 to 12 months, depending on usage.
- Clean the pipette after each use, especially with corrosive or viscous liquids
- Perform regular leak tests (e.g., with distilled water)
- Replace worn seals and pistons regularly
Pipetting may appear to be a basic laboratory skill, but it plays a major role in the accuracy of pharmaceutical microbiology testing.
Incorrect volume settings, poor aspiration technique, air bubbles, contaminated tips, inadequate mixing, and improper equipment use can all affect microbiological results.
Good pipetting is not only about accuracy it is also about maintaining data integrity.
