Aseptic Technique

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Aseptic Technique

• Protect eyes, mucous membranes, open cuts and wounds from contact with

 biohazard material.

• Use gloves, goggles, mask, and protective clothing as necessary. • Carry out all culturing operation in a laminar flow hood. • Disinfect all surfaces prior to use with a disinfectant solution. • Swab down the working surface liberally with 70% ethanol. • Periodically spread a solution of 70% ethanol over the exterior of gloves to

 minimize contamination.  Replace them if torn.

• In case of any spill, spread a solution of 70% alcohol and swab immediately with

 non-linting wipes.

• Discard gloves after use and do not wear them when entering any other lab area.

 Bring into the work area only those items needed for a particular procedure.

• Leave a wide clear space in the center of the hood (not just the front edge) to work

 on.  Do not clutter the area to prevent blockage of proper air flow and to 
 minimize turbulence.

• Swab with 70% alcohol all glassware (medium bottles, beakers, etc.) before

 placing them inside the hood.

• Arrange the work area to have easy access to all of it without having to reach

 over one item to get at another (especially over an open bottle or flask).

• Use sterile wrapped pipettes and discard them after use into a biohazard waste


• Check that the wrapping of the sterile pipette is not broken or damaged. • Inspect the vessels to be used: • T-flask – Must be free from visible contamination or breakage, or lack container

 identification.  The plastic covering the flask must be intact.

• Bottles – Check for cracks, expiration dates. • Spinners flasks – Check for cracks, expiration dates, and proper assembly. • Discard any biohazard or contaminated material immediately. • Never perform mouth pipetting. Pipettor must be used. • When handling sterile containers with caps or lids, place the cap on its side if it

 must be laid on the work surface.

• Make sure not to touch the tip of the pipette to the rim of any flask or sterile


• Clean the work area when finished by wiping with 70% alcohol.

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