Factors effecting the gelling and emulsifying properties of a natural polymer

Abstract

A B S T R A C TPorphyran, sulfated polysaccharide, is derived from the cell wall and intercellular regions of Porphyra and known to be closely related to agarose in its basic structure, whereas it is very different in terms of having L-galactose-6-sulfate. Besides of various physiological effects, it is having wide pharmaceutical applications. Its structure-related gelling and emulsification properties have given birth to a new polymer in polymeric science. Porphyran uses are based on their unique properties to form strong gels after desulfation in an aqueous solution. This gel results from peculiar regular chemical structures, specific ordered molecular conformations, and aggregations. Now a days, new methodologies and instruments have provided a more accurate view of the relationships between the chemical structure and the gelling characteristics of these complex hybrid and heterogeneous polysaccharides. NMR is the single most powerful technique for solving the structures of intact polysaccharides. Developments in the NMR render the determination of structural distribution of this galactan more accessible. Such techniques also yield new information on the aggregate formation of these sulfated polysaccharides. These and other data question the existence of the generally assumed intertwined double helical conformations of these galactans during gel formation. Currently, porphyran availability is not known because of several problems such as its high molecular weight and viscosity that are suppressing its growth in world market. Hence, world market needs development of this novel compound to improve its pharmaceutical applications though this is an area of algal utilization that demands more research.

Production and characterization of novel self-assembling biosurfactants from Aspergillus flavus

“…Surfactant from foam fraction had double the amount of reducing sugars compared with that from postfoam-removal fraction. The sugar linked with the hydrophobic moiety in both types of biosurfactants was identified as 3,6-anhydro-galactose that gave higher colour intensity with anthrone test as compared with other reducing sugars (Bhatia et al 2010). Also, the functional groups corresponding to methoxy phenyl oxime anhydrogalctoside identified by FTIR supported the above findings (Fig.…”

“…The sugar linked with the hydrophobic moiety in both types of biosurfactants was identified as 3,6-anhydro-galactose that gave higher colour intensity with anthrone test as compared with other reducing sugars (Bhatia et al 2010). Surfactant from foam fraction had double the amount of reducing sugars compared with that from postfoam-removal fraction.…”

Development of broad spectrum mycosporine loaded sunscreen formulation from Ulva fasciata delile

“…Marine organisms are the rich source of bioactive compounds which are having extensive range of biological activities such as antibacterial, anti-inflammatory, antifungal, antioxidant, antiulcer, sunprotective, immunomodulatory and anti-microbial algal compounds [18][19][20][21][22][23][24][25][26][27][28][29][30]. Algal resources or seaweed are considered as rich source of therapeutic compounds which are having potential and diverse biological activities.…”

Structural characterization and pharmaceutical properties of porphyran

“…[9,10] Porphyran (POR), anionic polysaccharide obtained from the hot water (alkali, acid, enzyme, radical hydrolyzed) soluble portion of cell wall of Porphyra. [11] Gelling properties of all the red galactans is dependent on the concentration of 3, 6AG which is a fine honeycomb-like network participates as a "hidden" precursor structure in galactan solutions at significantly high temperature. Polymeric formulations that exhibit sol-to-gel transition at physiological conditions are good candidates for tissue engineering applications.…”

“…were explored in our previous studies however structure, and gelling properties of POR are not explored yet. [11][12][13][14][15] Hence here in this work, we have successfully explored the structural as well as gelling properties of POR isolated from Porphyra vietnamensis.…”