Aug 03, 2025
In-vitro Mouse or Human Blood stability assay
- Nick Lynch1,2
- 1Curlew Research;
- 2ASAP Discovery Consortium
- ASAP Discovery
Protocol Citation: Nick Lynch 2025. In-vitro Mouse or Human Blood stability assay. protocols.io https://dx.doi.org/10.17504/protocols.io.261ge8m6og47/v1
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
We use this protocol and it's working
Created: May 25, 2025
Last Modified: August 03, 2025
Protocol Integer ID: 218906
Keywords: ADME, DMPK, drug discovery, blood stability, human blood stability, blood stability, key aspect of dmpk, pharmacokinetic, dmpk, drug metabolism, drug candidate behaves within the blood, other blood component, laboratory environment, controlled laboratory environment, blood, stability
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Abstract
In vitro blood stability is a key aspect of DMPK (Drug Metabolism and Pharmacokinetics) research, focusing on how a drug candidate behaves within the blood in a controlled laboratory environment. This involves evaluating the compound's stability, its rate of degradation, and its potential for interaction with other blood components.
Troubleshooting
Safety warnings
Always wear appropriate PPE for this protocol
Refer to Material Safety Data Sheets for additional safety and handling information.
Summary
The in-vitro mouse blood stability incubation assay is run in 96-well plates on a Thermomixer set to 39°C and 700 rpm
This protocol can be used with the following blood samples:
- Human (HBS)
- Mouse (MBS)
Sample Preparation
Fresh blood is aliquoted (297 µL) into relevant plate wells
Test compounds are diluted to 100 µM in methanol, and 3 µL is added to initiate the reaction
Assay
Quenching occurs at specified time points (0–120 minutes) by transferring 25 µL of the incubate
into wells pre-filled with ice-cold acetonitrile containing internal standard.
This is repeated column-by-column to maintain precise timing
After incubation, plates are sealed and stored overnight at 4°C.
Samples are centrifuged, and 150 µL of supernatant is transferred to a new plate, diluted with 30% methanol in water to a final volume of 300 µL
Method (MS) blanks are also prepared
Samples are injected onto LC-MSMS and the % remaining of the test compound at each time point calculated against T0
Data Analysis
The percent remaining of the test compound against time is calculated
For each test compound injection,
response ratio = Test peak area / Internal standard peak area in test
The response ratio is converted to % test compound remaining.
The % test compound remaining is plotted versus time.
Acknowledgements
Grateful to Concept Life Sciences for supplying the original protocol summary