Isoelectric gelatin tricomplex flocculation

However, we note that carrageen combined either with isoelectric gelatin, or with egg lecithin, has a greater tendency to tricomplex flocculation than chondroitin sulphate (equivalent weights of the colloid anions nearly the same 271 and 280). This is manifest by the former giving complex flocculation with the divalent cations Mg , Ca, Sr , Ba and the monovalent Li while the latter is no longer able to do so. 

TRICOMPLEX FLOCCULATION OF ISOELECTRIC GELATIN SOL WITH A MIXTURE OF TWO SALTS... 

In combinations with M07O24""", Fe(CN)6 ", Co(CN)e" and Hgl/ tricomplex flocculation occurs even with the micro cations which have a smaller affinity for the negative group of the amphoion than the above mentioned one. Thus this still takes place in the case of egg lecithin with Mg, Ca and Sr. Isoelectric gelatin also gives tricomplex flocculations with molybdate or with Hgl4" in the case of Mg, Ca, Sr and Ba but not with Fe(CN)6 " or Co(CN)6 ". 

The three anions mentioned no longer give tricomplex flocculation in the case of isoelectric gelatin with Li, which is not surprising since the polarisability of the carboxyl group of the gelatin amphoion is smaller than that of the phosphate group (of egg lecithin). 

It is further interesting that this tricomplex flocculation is not restricted only to the isoelectric point of the gelatin used (pH 5.1), but still also occurs at higher pH values (pH 6 — 8) and disappears only at about pH = 10,... 

---

See also in sourсe #XX -- [ ]

---