Sterile Medium Preparation
Sterile Medium Preparation - Related Videos
07:18
Bone Conditioned Medium: Preparation and Bioassay
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Cited by 13 •
2015
We describe here how to prepare bone-conditioned medium (BCM) and test its activity in vitro.
09:16
Medium-scale Preparation of Drosophila Embryo Extracts for Proteomic Experiments
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Cited by 4 •
2017
The goal of this protocol is to provide a straightforward and inexpensive approach to collecting Drosophila embryos at medium scale (0.5-1 g) and preparing protein extracts that can be used in downstream proteomic applications, such as affinity purification-mass spectrometry (AP-MS).
12:29
Sterile Tissue Harvest
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2016
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...
02:48
Preparation of Artificial Sputum Medium to Emulate Cystic Fibrosis Lung Sputum Ex Vivo
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2025
Source: Vieira, J., et al. Design and Development of a Model to Study the Effect of Supplemental Oxygen on the Cystic Fibrosis Airway Microbiome. J. Vis. Exp. (2021).This video demonstrates the preparation of an artificial sputum medium that mimics the viscosity, nutrient composition, and pH of cystic fibrosis lung sputum. The resulting medium provides a physiologically relevant platform for ex vivo studies.
06:17
Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions
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Cited by 57 •
2019
As obligate anaerobic organisms are unable to grow upon oxygen exposure, the use of anaerobic culturing techniques is indispensable. Here, we demonstrate a simple and effective method to cultivate a mixed culture derived from a biogas plant from media preparation to gas and volatile fatty acid quantification.
FAQs
Culture conditions depend on the concentrations of the medium’s defined components and its adjusted pH. Variation in either factor can change how cells, tissues, or microorganisms grow, making treatment responses or growth measurements harder to compare. Maintaining the intended composition therefore supports reproducibility and helps researchers distinguish biological effects from changes introduced during media preparation.
Autoclaving and membrane filtration provide alternative ways to sterilize prepared media, with filtration used when appropriate for the medium. The choice should match the characteristics of the formulation and the intended experiment. Selecting a suitable sterilization approach helps remove viable microbial contaminants while preserving a medium that can support the required biological culture.
Sterilization does not by itself protect the medium during later handling. Aseptic transfer limits the opportunity for viable contaminants to enter as the prepared medium is moved or dispensed. Preserving sterility at this stage is essential because contamination can compromise cell, tissue, or microorganism cultures and interfere with reliable interpretation of growth or treatment responses.
A typical workflow begins by dissolving the defined medium components, adjusting the pH, and bringing the preparation to the required volume. The medium is then sterilized by autoclaving or, when appropriate, membrane filtration. Finally, it is transferred under aseptic conditions. Keeping these stages consistent creates a controlled culture environment for subsequent biological work.
Researchers use this preparation approach whenever controlled growth of cells, tissues, or microorganisms is required. It supports work in cell biology, microbiology, and tissue engineering, where cultures must remain healthy and conditions must be comparable across experiments. Reliable media preparation is especially valuable when evaluating growth patterns or responses to experimental treatments.
Well-prepared media reduce two major sources of experimental uncertainty: inconsistent culture composition and microbial contamination. This improves the reliability of growth measurements and treatment-response assessments while helping maintain healthy cultures. In biology research, such control allows observed outcomes to be attributed more confidently to the experiment rather than to unintended changes in the culture environment.