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I recently found out that certain plants produce needle-shaped crystals called raphides. I am a physicist and I have an experiment in mind that could use these needles, but I would need to extract them from the plant and keep them in a liquid solution somehow.

How can I do this? Is this possible/hard to do? Does anybody know how to do this or have any experience?

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Searching for raphide purification I came up with a paper where they isolate these crystals from kiwi fruit:

Konno, K., Inoue, T. A., & Nakamura, M. (2014). Synergistic defensive function of raphides and protease through the needle effect. PloS one, 9(3).

Does that help?

Note, however, that while according to this paper these large crystals can be kept in suspension that isn't the same as a solution ...

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