Abstract
Modification the physical properties of alginate using polymannuronate and polyfuluronate has been conducted. Polimannuronate and poliguluronate isolated from alginate with hidrochloric acid heating methods and precipitation based on pH, and the resulting product was characterized its viscosity. Polymannuronate and polyguluronate used to modify the functional properties of alginate from Sargassum crassifolium. Polymannuronate and polyguluronate were added and mixed into the alginate powder with a proportion of 0, 10, 20 and 30% (w/w). The results were then characterized the nature of the gel formulations which include gel strength, modulus of rigidity and syneresis. The results showed that the viscosity of the alginate used as a source polymanuronate and polguluronate of 162.89 + 3.66 cP. Polymannuronate and polyguluronate product has a viscosity respectively 85.00 + 5.90 cP and 100.44 + 2.27 cP. The addition of polymannuronate and polyguluronate into alginate produced the characteristic changes of the gel. The addition of polyguluronat tended to improve gel strength and modulus of rigidity, while the addition of polymannuronate tended to lower the gel strength with the same modulus of rigidity of alginate gel.
Highlights
Alginate is one type of hydrocolloid, which is a colloidal system by organic polymers in the water
In Indonesia, the alginate can be extracted from brown seaweeds like Sargassum sp. and Turbinaria sp., that the potential was quite large [1]
In particular for alginates extracted from Indonesian brown seaweed such as Sargassum sp. and Turbinaria sp., which has low mannuronic-guluronic ratio (MG ratio), causing the high value of syneresis on the gel [5]
Summary
Alginate is one type of hydrocolloid, which is a colloidal system by organic polymers in the water. In Indonesia, the alginate can be extracted from brown seaweeds like Sargassum sp. Functional properties of natural alginate often have weakness such as low solubility, low gel strengths, as well as high value of syneresis so that cause limitations in its use [3]. In particular for alginates extracted from Indonesian brown seaweed such as Sargassum sp. Turbinaria sp., which has low mannuronic-guluronic ratio (MG ratio), causing the high value of syneresis on the gel [5]. One effort to overcome the weakness of natural alginate is to make modifications like adding polymannuronate and polyguluronate to fix these weaknesses. In this study we have evaluated the effects of adding polymannuronate and polyguluronate on the physical properties of the alginate gel
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