ISHS Acta Horticulturae 811: VI International Congress on Cactus Pear and Cochineal
STUDY OF THE STABILITY AT COALESCENCE IN MUCILAGE EMULSIONS |
| Authors: | L. Iturriaga, C. Quinzio, M. Corvalan, B. Mishima |
| Keywords: | amphyfilic, hydrocolloids, polysaccharides, rheology, viscosity |
| Abstract:
Mucilage is a mucopolysaccharide found in cacti cladodes [(Opuntia ficus-indica (L.) Mill)] and the same as hydrocolloids modify food functional properties. Presence of a low molecular weight protein fraction has been reported. It is known that polysaccharides such as the xanthan (XG) and guar gums (GG) are used in the formulation of emulsions. Since the latter has a 1-2% protein content that conveys it those amphyfilic characteristics needed for the stabilising activity, the Opuntia spp. mucilage might be used as an emulsifying agent. Thus, this work was aimed at evaluating stability at coalescence in emulsions prepared using mucilage and comparing them against that of commercial hydrocolloids emulsions. Isoviscous solutions of freeze-dried mucilage (FM), GG, XG, and carboxy methyl cellulose (CMC) were prepared. In turn, 1:5 emulsions (v:v; oil: solution) were prepared using the NATURA® commercial oil and a polysaccharide solution, and homogenised with a blender for 4 min. Emulsion stability (ES) at coalescence was evaluated by centrifugation at 10.000 rpm for 10 min and registering the lipid phase retained. In addition the native mucilage-based emulsion stability was evaluated and apparent viscosities were determined using the TA Instruments AR 1000 rotational rheometer. The results showed that both XG and FM were the best stabilizing agents with 100% ES. The CMC displayed a 12% ES, while the GG and native mucilage (2%) at 89-90% one. They all indicate that the mucilage has stabilizing properties similar to those of the hydrocolloids under study. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
