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Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country.
CRYOPRESERVATION:?
Only young cells (rings) can be frozen in glycerolyte medium** because their membranes are more robust.
1.???? Centrifuge ring-stage culture for 5 mins. at 1000 x g in 50 ml centrifuge tube.
2.???? Aspirate supernatant using sterile Pasteur pipet.
3.???? Resuspend pellet gently in remaining supernatant.
4.???? Slowly add 5 volumes of glycerolyte medium to 3 volumes pellet dropwise via a syringe as follows:
??????? A.??? Add the first volume of glycerolyte and allow the tube to stand for 5 mins. at room temperature.
B.??? Add the remaining 4 volumes of glycerolyte and gently agitate.
5.?? Aliquot mixture into Nunc screw-capped freezing vials and place in a Nalgene 1C cooling apparatus. Place the apparatus at -80°C overnight and then plunge ampules into liquid nitrogen.? (The cooling rate in this apparatus is approximately -1°C/min.).
6.?? Plunge vials into liquid nitrogen (-196oC) the next day and store in liquid nitrogen or liquid nitrogen vapor.
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Nguyen-Dinh P, Trager W. Plasmodium falciparum in vitro: determination of chloroquine sensitivity of three new strains by a modified 48-hour test. Am. J. Trop. Med. Hyg. 29: 339-342, 1980. PubMed: 6992605
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