Dialysis tubing
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203262196
2008-04-04T11:03:34Z
140.103.199.89
Removed vandalism
[[Image:Dialysistubing sizecomp.jpg|thumb|right|Dialysis tubing size comparison with that of a quarter]]
'''Dialysis Tubing''' is a type of [[Semipermeable membrane|semi or partially permeable membrane]] [[tubing]] made from regenerated [[cellulose]] or [[cellophane]]. It is used for [[diffusion]], or more accurately [[osmosis]]. It allows the passage of small molecules but not larger ones. It is used in clinical circumstances to ensure a filtered flow of molecules, preventing the flow of larger solute molecules. Small molecules can be 'washed' out of a solution which is pumped through the tubing into a solvent, usually water, which surrounds it and in which they can be flushed away.
in demonstrations of semi-permeable membranes, a solution containing several types of molecules, usually glucose and starch, is placed into a semipermeable [[dialysis]] bag, such as a [[cellulose]] membrane with pores, and the bag is sealed. The sealed dialysis bag is placed in a container of a different solution, or water. Molecules small enough to pass through the tubing (water, salts, [[monosaccharides]], and other small molecules) tend to move into or out of the dialysis bag in the direction of decreasing concentration, therefore displaying diffusion. Larger molecules (such as [[protein]]s, or [[polysaccharide]]s) that have dimensions significantly greater than the pore diameter are retained inside the dialysis bag.
[[Category:Diffusion]]
[[Category:Filters]]