Inoculation of the medium<ol><li>Prepare inoculum from the anaerobic digester.<ol style='list-style-type:decimal;'><li>Add 400 mL of distilled water to a flask and bring it to a boil.</li><li>Cool it down (&lt; 30 &#176;C) while permanently flushing the headspace with N2.</li><li>Add approximately 100 g of sludge derived from an anaerobic digester. NOTE: Avoid excessive contact of sludge with oxygen.</li><li>Record the exact mass of added sludge for the exact determination of dilution.</li><li>Exchange the flask&#8217;s headspace with N2 and close it with a butyl rubber septum.</li><li>Shake the flask for 30 min at 120 rpm.</li></ol></li><li>Remove 5 mL of inoculum by using a syringe + cannula and inject it into the prepared serum flasks.</li></ol>

<table><tbody><tr><td>Culture flasks (120 mL, N20)</td><td>Ochs, Germany</td><td>102046</td><td> </td></tr><tr><td>Butyl rubber septa (N20)</td><td>Ochs, Germany</td><td>102049</td><td> </td></tr><tr><td>Aluminium caps (N20)</td><td>Ochs, Germany</td><td>102050</td><td> </td></tr><tr><td>N&#8322; gas</td><td>Messer, Austria</td><td> </td><td>Purity 5.0</td></tr><tr><td>Syringes + cannulae</td><td>various</td><td> </td><td> </td></tr><tr><td>Crimper</td><td>Ochs, Germany</td><td>102051</td><td> </td></tr><tr><td>De-crimper</td><td>Ochs, Germany</td><td>102052</td><td> </td></tr><tr><td>GC2010</td><td>Shimadzu</td><td> </td><td> </td></tr></tbody></table>

preparing an anaerobic sludge culture under oxygen-free conditions

Preparing an Anaerobic Sludge Culture under Oxygen-Free Conditions

Source: <a href='https://app.jove.com/v/60155/medium-preparation-for-cultivation-microorganisms-under-strictly'>Wagner, A. O.,et al., Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions. J. Vis. Exp. (2019)</a>This video demonstrates the preparation and inoculation of anaerobic cultures using oxygen-free sludge under strictly controlled, deoxygenated conditions.

Source: Wagner, A. O.,et al., Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions. J. Vis. Exp. (2019)This ...

Begin with a flask containing distilled water.Boil the water to remove dissolved oxygen, minimizing residual oxygen that can inhibit anaerobic growth.Cool the water while continuously flushing with nitrogen to prevent oxygen reabsorption.Place the flask on a weighing balance and add a fixed quantity of anaerobic digester sludge.The sludge contains various types of anaerobic microbes and residual organic material.Add nitrogen and immediately seal the flask with a rubber septum to maintain anaerobic conditions.Incubate with shaking to disperse anaerobic bacteria uniformly and stimulate metabolism by improving contact with organic matter in the sludge.The oxygen-free environment allows the obligate anaerobes to proliferate by preventing oxidative stress-induced metabolic damage.Post-incubation, allow the larger sludge particles to settle.Next, using a syringe, withdraw the anaerobic inoculum.Transfer the inoculum into a serum flask containing oxygen-free growth medium to promote anaerobic bacterial survival.To prepare inoculum from anaerobic digester, add 400 milliliters of distilled water into a flask and bring it to boil.Cool it down to approximately 30 degrees Celsius while permane

preparing-an-anaerobic-sludge-culture-under-oxygen-free-conditions

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631 Views. Begin with a flask containing distilled water.Boil the water to remove dissolved oxygen, minimizing residual oxygen that can inhibit anaerobic growth.Cool the water while continuously flushing with nitrogen to prevent oxygen reabsorption.Place the flask on a weighing balance and add a fixed quantity of anaerobic digester sludge.The sludge contains various types of anaerobic microbes and residual organic material.Add nitrogen and immediately seal the flask wi...

Abstract

Inoculation of the medium<ol><li>Prepare inoculum from the anaerobic digester.<ol style='list-style-type:decimal;'><li>Add 400 mL of distilled water to a flask and bring it to a boil.</li><li>Cool it down (< 30 &#176;C) while permanently flushing the headspace with N2.</li><li>Add approximately 100 g of sludge derived from an anaerobic digester. NOTE: Avoid excessive contact of sludge with oxygen.</li><li>Record the exact mass of added sludge for the exact determination of dilution.</li><li>Exchange the flask&#8217;s headspace with N2 and close it with a butyl rubber septum.</li><li>Shake the flask for 30 min at 120 rpm.</li></ol></li><li>Remove 5 mL of inoculum by using a syringe + cannula and inject it into the prepared serum flasks.</li></ol>

Preparing an Anaerobic Sludge Culture under Oxygen-Free Conditions

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Name	Company	Catalog Number	Comments
Culture flasks (120 mL, N20)	Ochs, Germany	102046
Butyl rubber septa (N20)	Ochs, Germany	102049
Aluminium caps (N20)	Ochs, Germany	102050
N₂ gas	Messer, Austria		Purity 5.0
Syringes + cannulae	various
Crimper	Ochs, Germany	102051
De-crimper	Ochs, Germany	102052
GC2010	Shimadzu