Acid precursor gelatin, complex

Complex Coacervation of Acid-Precursor Gelatin with a Polyphosphate... 

LENK ANDTHIES Complex Coacervatiort of Acid- Precursor Gelatin... 

CAS 9000-70-8 EINECS/ELINCS 232-554-6 Synonyms Gelatine Gelatins White gelatin Definition Complex combination of proteins obtained from partial hydrolysis of collagen derived from animal skin, connective tissues, and bones Type A is derived from acid-treated precursor. Type B from alkali-treated precursor... 

To further understand the synthesis mechanism used in this work, which uses gelatin instead of ethylene glycol, it is necessary to review the traditional polymeric precursor method proposed by Pechini (Pechini, 1967). The Pechini method involves the formation of stable metal-chelate complexes with certain alpha-hydroxycarboxyl adds, such as dtric acid, and polyesterification in the presence of a polyhydroxy alcohol, such as ethylene glycol, to form a polymeric resin. The metal cations are homogeneously distributed in the polymeric resin, which is then calcined to yield the desired oxides. The most common materials used as source of cations are nitrate salts since they can be fully removed at low temperatures (400 - 500 °C). The synthesis mechanism of the modified Pechini method used in this work can be explained in three basic steps, as shown in Fig. 2. It stands out by its simplicity and low cost, using only citric acid, gelatin and metal nitrates as reagents. 

---