The
proteins adsorbed on the rubber particles have not been studied in
much detail due to the difficulties in removing them unchanged from
the particle surface. However, proteins from fresh latex particles have
isoelectric points ranging from pH 4.0 to 4.6, depending on the rubber
clonals (8), indicating that more than one kind of proteins is adsorbed
on the rubber particle and that the relative proportions of the
adsorbed proteins on the rubber particle is a characteristics of the
clone.