Polysucrose 200 is widely used in biological and medical research as a density gradient medium for cell separation and purification. It is particularly effective in isolating specific cell types, such as lymphocytes, from whole blood or tissue samples. Its high molecular weight and low osmolarity make it ideal for creating gradients that allow cells to separate based on density without causing damage or osmotic stress. Additionally, it is utilized in the preparation of samples for flow cytometry, where it helps in achieving high-purity cell populations. Its non-toxic and inert nature ensures minimal interference with cellular functions, making it a reliable choice for various laboratory applications.