Phage Buffer
Phage Buffer - Related Videos
04:30
Phage Purification from Borrelia burgdorferi
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2026
Source: Eggers, C. H. Phage-Mediated Genetic Manipulation of the Lyme Disease Spirochete Borrelia burgdorferi. J. Vis. Exp. (2022).This video demonstrates the isolation of borrelial phage particles from a Borrelia burgdorferi suspension using polyethylene glycol-mediated phase separation. The sample is centrifuged, treated with a salt solution, and a molecular crowding agent to precipitate phages. Chloroform extraction is done to remove debris and concentrate phage particles. The purified phage...
02:56
Buffers
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2020
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
04:35
Buffers - Concepts
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2020
Buffers When an Arrhenius acid (HA) is added to water, it dissociates into its conjugate base (A-) and a hydrogen cation (H+). HA + H2O → H+(aq) + A-(aq) The amount of hydrogen ions present in the solution determines the acidity of the solution, where more hydrogen ions indicate a lower or more acidic pH. Similarly, when a strong Arrhenius base (BOH) is added to water, it dissociates into its conjugate acid (B+) and a hydroxide ion (OH-). BOH + H2O → B+(aq) + OH-(aq) Generally, the addition of...
14:31
Buffers - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparing 50 mM NaH2PO4 Buffer, pH 7Expand In the first part of this experiment, you will prepare a sodium phosphate solution buffered at pH 7.0. Monosodium phosphate is a weak acid with the conjugate base, disodium phosphate. Unadjusted monosodium phosphate solutions usually have a pH of about 4 - 6. Buffers are most effective close to their pKa, which is 6.8 to 7.2 for monosodium phosphate. So, you will use NaOH to push the...
08:13
Buffers - Instructor Prep
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of SolutionsExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. To set up for this lab experiment, wear the appropriate personal protective equipment, including a lab coat, chemical splash goggles, and gloves. All solutions for this lab should be prepared in a chemical fume hood. Prepare 100 mL of a 1 M NaOH solution. Note:...
FAQs
Phage buffer preserves infectivity by controlling two important chemical variables: pH and ionic strength. These conditions help limit unwanted changes in the surrounding solution while phage particles remain outside bacterial host cells. A stable environment becomes particularly important during dilution or transfer, when inconsistent conditions could affect subsequent infection measurements.
Divalent ions can support both phage particle integrity and adsorption, the process by which a phage attaches to a bacterial host cell. Their inclusion therefore addresses two linked requirements of experimental infection: maintaining particles in a usable state and supporting interaction with susceptible bacteria. This makes the formulation relevant to assays that measure phage activity.
Changes in pH or ionic strength alter the chemical environment surrounding bacteriophages during handling. Because these variables contribute to particle stability and, in some formulations, host-cell adsorption, inconsistent conditions can change the reliability of infection studies. Maintaining them consistently helps researchers compare phage measurements across dilutions, assays, and prepared samples.
In serial titrations, phage buffer provides the controlled solution used to dilute lysates or phage samples before activity is measured. It also supports plaque assay preparation, where reproducible conditions are needed to quantify phage infection. Using the same controlled buffer environment across dilutions helps make differences in measured activity easier to interpret.
Researchers use phage buffer when preparing lysates for dilution, maintaining phage stocks, and handling samples during routine experiments. Its role is not limited to a single measurement: the same type of controlled chemical environment can support storage and experimental preparation. Consistent treatment helps preserve infectivity while samples move between these stages.
Consistent phage buffer conditions support studies of virus-host interactions, bacterial control, and phage-based biotechnology. In these settings, researchers may need to compare how effectively phages remain infectious or interact with bacterial cells. Reliable buffer conditions strengthen the interpretation of plaque assays, titrations, and other infection-related measurements used across biology research.