How is Triton X-100 lysis buffer prepared for animal tissue protein extraction experiments?

Why use detergents to lyse cells

Animal tissues and cells contain many proteins, but the cell membrane is a lipid bilayer structure. If it is not dissolved, it is difficult for the proteins to be released. As a non-ionic detergent, Triton X-100 can gently disrupt the cell membrane, allowing soluble proteins inside the cell to enter the solution. Its action is relatively mild and it does not easily denature proteins completely, so it is widely used for protein extraction from animal tissues.

Common ideas for the composition of lysis buffer

A basic Triton X-100 lysis buffer usually contains several components: a buffer system, salt, detergent, and protease inhibitors. The buffer system commonly uses Tris-HCl to help maintain a suitable acid-base environment; the salt commonly uses sodium chloride to maintain a certain ionic strength; the volume fraction of Triton X-100 is commonly between 0.1% and 1%; protease inhibitors are used to prevent proteins from being degraded during the extraction process. For different tissues, phosphatase inhibitors or other protective agents can also be added.

Operational precautions

After sampling animal tissues, they should be processed as soon as possible, preferably kept on ice throughout the procedure. First mince the tissue, add pre-cooled lysis buffer, and thoroughly disperse it with a homogenizer. After homogenization, it can be left standing on ice for a period of time to allow Triton X-100 to act fully. Then centrifuge at low temperature, and the supernatant is the protein extract. Avoid vigorous foaming, because excessive foam may affect protein activity. Repeated freeze-thaw cycles should also be minimized, and aliquoted storage is recommended.

Storage and quantification of proteins after extraction

If the extracted protein solution will not be used the same day, it can be aliquoted and stored in a low-temperature freezer. For quantification, the BCA method or Bradford method is commonly used, but note that Triton X-100 may slightly interfere with some quantification methods, so it is best to add the same concentration of detergent to the standard solution as well. The values obtained in this way are closer to the true situation. Keep clear records throughout the entire process, which helps with traceability in subsequent experiments.