Metabolites on the inside | Nature Chemistry
Metabolites on the inside | Nature Chemistry"
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To demonstrate the potential of their method, the team analysed the metabolites inside plant cells from an Allium cepa (onion) bulb. In the first step, a microdissection needle cuts a hole
in the cell membrane while leaving the organelles intact. Only a single cell is cut open during dissection and the neighbouring cells remain undamaged. In the next step, an optical fibre
with a 15-μm tip is used to direct a laser IR pulse at a specific region. The pulse creates a plume of ejected material that is ionized and characterized using electrospray mass spectrometry
to identify the metabolites present. The sharpened tip of the optical microfibre is a similar size to the cell nucleus, which enables the team to selectively ablate it — although some cross
contamination with the surrounding cytoplasm is inevitable. Aiming the optical fibre solely at the cytoplasm allowed for the selective analysis of the metabolites present outside the
nucleus.
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