Resuspension Calculator

Suppose we were to tell you that we have a resuspension calculator that will take out all the guessing from dissolving oligos and help you with accurate measurements to prepare your stock solution! How would that make you feel?

If that makes you feel optimistic, then you should also know we have many exciting topics for you to read about — like primer and cell resuspension or what a resuspension buffer is. We will also explain the capabilities of our oligo resuspension calculator, elaborating on the resuspension formula as we go.

In a solution, the substances that tend to settle or sediment at the bottom must be mixed or agitated. This process of remixing is called resuspension. In chemistry, this solution can be either gas or liquid. This is typically done to redistribute the particles or molecules of the substance evenly throughout the liquid, allowing for more accurate analysis or use.

You may come across many terms surrounding resuspension, like:

• Primer resuspension;
• Oligo resuspension;
• Cell resuspension; and
• Resuspension buffer.

We will be talking about them later in the article, so stay tuned!

An oligo resuspension calculator is a tool used to determine the volume of the diluent needed to dissolve a given amount of oligonucleotides (short DNA or RNA molecules) to a desired concentration.

Our calculator is a convenient tool of its kind that takes into consideration the amount of oligos, the desired concentration, and the volume of the diluent. And the most interesting thing about our tool — as long as you have any two of the three mentioned quantities, it will automatically determine the third for you.

So how do you determine the volume of diluent using our resuspension calculator? Follow the steps below, and you will have your answer.

1. Input the amount of oligonucleotides. The default unit is $\text{nmol}$ (nanomoles), but you have the option to change to other mole based units.
2. Next, input the desired concentration of the solution you want for resuspension. The default unit is $\text{μM}$ (micromolar), which is one millionth of a mole per liter. You may change it to other available concentration units.
3. The result is the required volume of the diluent needed to prepare the resuspension solution. The default unit is $\text{μL}$, but you can change it to any other volume measuring unit.

Let's take an example, say you have a $60 \text{ nmol}$ oligo, and the desired solution concentration is $40 \text{ μM}$ — what would be the diluent volume to resuspend the oligos? In the calculator, you'd enter $60$ as the amount of oligo and $60$ as the desired concentration. The result would be $1,\!500 \text{ μL}$ as the required volume of diluent.

A cell resuspension solution is a liquid that resuspends cells that are clumped together after being harvested from a culture. This solution generally comprises a buffer to regulate pH and components such as salts, sugars, and proteins to provide nutrients.

You may use it to resuspend cells, proteins, DNA, and other biological materials. The cell resuspension solution helps improve the precision of experiments that demand homogeneous solutions.

The composition of the resuspension solution may differ based on what type of cell you need to resuspend. So, it is time to check out the resuspension formula:

This means all you have to do is take the amount of oligo in nanomol, multiply it by 1000, and divide it by the desired concentration of your resuspension solution in micromolar, to estimate the solvent volume in microliter.

For example, if you want to resuspend $10 \text{ nmol}$ of oligo in TE buffer to a concentration of $100 \text{ μM}$, you need to determine the amount of the buffer. Let's substitute the values in the resuspension formula:

To ensure complete resuspension, pipet or vortex the buffer after adding the oligo.

A uniform distribution of oligonucleotides in a solution, achieved by resuspension, is a prerequisite for many molecular biology applications like:

• Polymerase chain reaction (PCR): A lab technique to amplify segments of DNA;
• Sequencing and DNA sequencing: The process of determining the precise order of nucleotides; and
• Gene expression analysis: The process of studying the genetic information composed in a cell.

Oligonucleotides are highly sensitive to environmental factors, making resuspension a difficult process. Hence the need to dissolve them in a buffer solution to ensure an optimal environment.

A resuspension buffer is a solution we use to resuspend and dissolve biological samples, such as cells or DNA. The buffer's composition comprises salts, detergents, and other stabilizing agents that preserve the sample's integrity and prevent degradation. The design of the resuspension buffer may vary depending on the specific application.