this is unrelated - how strongly can a power LED cooled to liquid nitrogen temperature shine by 100mA current?
for crushing the plant material, we used a ceramic pot
screwdriver doubles as crushing tool
after the liquid nitrogen evaporated, we added isopropyl alcohol to the pot
building a makeshift centrifuge - the first version is a modified PC fan with attached clips holding the tube containing our chlorophyll-containing isopropyl alcohol
second makeshift centrifuge idea: a disassembled harddrive, should provide more spin
second centrifuge works really well! we stuck the tubes onto the disk with duct tape
the centrifuging caused all the remaining solid parts of the plants cells to collect at the bottom of the tube
extracting chlorophyll out of a leaf using liquid nitrogen to break up the cell walls and isopropyl alcohol as solvent - success!
fun fact: the chlorophylls green color we see is the light reflected - the part of the spectrum photosythesis can't process. but chlorophyll is fluorescent and should glow red under UV light
and it actually does!