2009年5月15日星期五

What is an exclusion limit?

http://www1.gelifesciences.com/APTRIX/upp00919.nsf/content/23E7268B06D81881C1256EB400483DC8?OpenDocument&Path=Catalog&Hometitle=Catalog&entry=4&newrel&LinkParent=C1256FC4003AED40-4FE9D73C05DE40CFC12570D90042178C_RelatedLinksNew
The exclusion limit is the molecular weight of the smallest molecule which cannot enter the pores of the matrix. All molecules bigger than the exclusion limit elute in the void volume. The exclusion limit means that the sample is no longer fractionated and will be excluded from entering the pores. This limit will be just above the upper limit of the fractionating range.
The exclusion limit is an extrapolated value defined by convention.

水果皇后-草莓