I aim to treat cancer cell line with lactobacillus acidophilus lysate and I lysed it by sonication, now I need to know how long can I store this lysate in -80 befroe treatment date.
Actually, it can be stored for several years in -80, but repeated freeze/thaw cycles may degrade the protein content of your sample. As a rule of thumb, never freeze the same batch of sample twice. Some proteins might be more stable than others, but to be on the safe side, aliquot your samples and do not freeze them again after you have used once.