Inoculation Loop Sterilization
Inoculation Loop Sterilization - Related Videos
12:29
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Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN In 1959 The 3 R's were introduced by W.M.S. Russell and R.L. Burch in their book The Principles of Humane Experimental Technique. The 3 R's are replacement, reduction, and refinement of the use of animals in research. The use of cell lines and tissue cultures that originated from research animals is a replacement technique, as it allows for many experiments to be conducted in vitro. Harvesting...
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06:09
Intratracheal Inoculation of Fischer 344 Rats with Francisella tularensis
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FAQs
Red-hot heating supplies enough heat to incinerate microbial cells and biological residue remaining on the metal loop. Removing these materials is essential before the loop contacts another culture or laboratory surface, because residual material could introduce unwanted microorganisms and compromise the reliability of subsequent transfers.
Cooling prevents the heated metal from damaging the inoculum during transfer. A loop that remains hot can affect the biological material placed on it, making the transfer less reliable. Waiting briefly after heating preserves the material needed for streaking, isolation, or continued culture maintenance.
Sterilization before transfer removes residual microorganisms that could enter the selected culture, while sterilization afterward removes material picked up during handling. This two-stage practice separates successive manipulations and helps keep cultures, samples, and laboratory surfaces from exchanging unintended biological material.
Begin by heating the metal loop in a flame until it becomes red hot. Allow it to cool before contacting the culture, then perform the transfer. Afterward, heat the loop again to eliminate remaining cells and residue. Repeating this sequence for each manipulation supports consistent aseptic handling.
The loop should be sterilized immediately before it receives biological material and again after the transfer is complete. Applying the sequence throughout streak plating and culture maintenance limits carryover between manipulations. Consistent timing helps preserve the intended culture and reduces the chance that laboratory surfaces become contaminated.
Proper practice supports reliable streak plating, microbial isolation, and culture maintenance by reducing contamination from residual cells or other material. It also improves experimental accuracy and protects samples from unintended mixing. These benefits make the technique relevant whenever biological material must be transferred while maintaining separate cultures.