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I extracted a sample from a plant seed using PBS buffer. The extracted sample is very viscous, even after centrifugation at 15000 rpm for 30 min. The sample is like a thick mucus so that it becomes difficult to do a hemagglutination assay, and it keeps falling off the pipette tip because of its slimy nature. I can't even estimate the protein content accurately. What can I do to reduce its viscosity?

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I cannot speak for plant extracts, but a major cause of viscosity with bacterial cell extracts and some animal tissue extracts is the presence of DNA. The problem may be alleviated by adding DNAase. A good example may be found here

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