Originally published by StressMarq Biosciences Feb 2015 | Updated July 2025

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Improper storage and handling of reagents can compromise experimental results and waste valuable resources. This 2025 update includes new guidelines, labeling strategies, and digital tools to help you protect your reagents and your research.

Updated Storage Guidelines by Sample Type

• Antibodies: Store unconjugated antibodies at –20°C or –80°C. Conjugated antibodies (e.g., fluorescent or enzyme-linked) should be stored at 2–8°C and protected from light.
• Biological samples: Use cryogenic storage (–150°C or lower) for long-term preservation of sensitive biomolecules.

Aliquoting and Labeling Best Practices

• Use low-binding tubes and thermoplastic labels that resist solvents and freezing conditions.
• Include 2D barcodes or unique identifiers linked to a digital inventory system for traceability.

Avoiding Freeze-Thaw Damage

• Minimize freeze-thaw cycles by aliquoting reagents into single-use volumes.
• Use cryoprotectants like glycerol or DMSO when freezing proteins or cells.

Environmental Monitoring

• Store reagents away from high airflow zones in cold rooms to prevent desiccation.
• Use temperature loggers or smart freezers to monitor fluctuations and prevent degradation.

Additional Information

Check out Biocompare’s guide to Best Practices for Biological Sample and Storage Management.

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Original Blog (2015)

Many people don’t take the time to learn how to store and handle their reagents properly. This can lead to reagents that do not work as expected, and this can have a huge impact on your experimental results.

Here are 4 golden rules to follow to get the most from your expensive reagents:

1. Store them correctly

When you receive a new reagent, don’t leave it sitting on your desk for hours or days. Check out the datasheet to see how/where it is supposed to be stored, then do it.

You may think you know how a particular type of reagent is supposed to be stored, but not all products are the same.

Most antibodies and proteins require -20⁰C or -80⁰C, so you may think all antibodies go in the -20⁰C, right? Wrong! Antibodies that have been conjugated need to be stored between 2-8⁰C; that includes conjugated primary and secondary antibodies. Always check the datasheet.

Did your fluorescent antibody or dye come in a clear plastic tube, enabling you to see the beautiful shimmering colour? Whoops!

You should transfer it to an amber (brown) vial or wrap it in tin foil to prevent it from getting photobleached.

Even in the freezer, repeated exposure to light when the door is opened can damage your dye.

2. Aliquot, aliquot, aliquot… x 100

Make time when you first receive the product to measure out aliquots. This avoids freeze thaw cycles that can damage your antibodies and proteins.

Also, in the event of contamination, only one aliquot will be ruined, not the whole amount.

Aliquoting also allows for easy sharing of reagents with other labs without giving away the whole vial, which you may never see again! Sharing now also allows you to expect reciprocal sharing in the future!

3. Don’t double dip

Unless you prepared one-time use aliquots, you may risk contaminating your vial by using a pipette tip that has already been dipped into another solution. So discard it, and use a fresh tip every time.

4. Optimize!

The recommended dilution listed on a datasheet from a manufacturer is usually just that, a recommended dilution.

It isn’t the lowest amount possible that you can use and still see results. It is the concentration at which most users should start to optimize from.

You need to test out every antibody, and every new lot number, to see what is the best dilution for your species, tissue, and application.

It is likely that you can use a much lower concentration than recommended by optimizing the protocol beforehand.

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