The total protein content of fresh latex is approximately 1–1.5%, of
which about 20% is adsorbed on the rubber particles and the similar
proportion is associated with the bottom fraction (4), with the
remainder dissolved in the serum phase. The major component of the
adsorbed proteins is most likely α-globulin, that has a molecular
weight of approximately 200 kDa and it is insoluble in pure water
(5,6). Hevein, the second major protein in latex has a molecular
weight of 5 kDa and is a water-soluble protein generally present in the
bottom fraction of latex (7)