In general snap freeze and then grind using a mortar/pestle, microhomogenizer or bead beater. The first method is best for large volumes of tissue but tends to have a lower yield. If your lab lacks the apparatus then it is probably cheapest to order in some microhomogenizers.
It's doable using a glass dounce homogeniser, which is much easier than grinding the tissue while frozen. Put the lysis buffer into the douncer, drop the still-frozen tissue sample in, and then homogenise immediately as the sample begins to thaw. In my experience, lung often contains some fibrous/elastic tissue which will not homogenise properly. Remove this by quick centrifugation and then proceed with RNA extraction from the supernatant.
Dr. Leighton, thank you very much for these tips. They indeed may come in handy, as I have noticed lung is very fibrous and tricky to homogenise.
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