Abstract
Alginate extracted from the macroalgae Sargassum sinicola was used as the raw material for co-immobilization of the microalgae Chlorella sorokiniana and growth-promoting bacterium Azospirillum brasilense for wastewater treatment and as an inoculant carrier of A. brasilense for plant growth promotion. The composition, structure, viscosity, color, and phenolic compound content of the alginate were analyzed and compared with commercially available alginate produced from the macroalgae Macrocystis pyrifera. From 1H NMR analysis of alginate, S. sinicola was found to have more guluronic acid (F G=0.64) than it had mannuronic acid (F M=0.38) and had a viscosity of 13.5 m Pa s compared to 50 m Pa s for M. pyrifera. The S. sinicola alginate had dark brown color, reducing light penetration, with more phenolic compounds than M. pyrifera alginate. Nonetheless, growth of C. sorokiniana and A. brasilense in S. sinicola alginate was not significantly different than the growth in M. pyrifera alginate beads. Nutrient removal from wastewater by the co-immobilized microorganisms was similar for both types of alginate beads, and so was the growth enhancement of tomato plants inoculated with microbeads containing A. brasilense. This study shows the potential use of S. sinicola alginate as a raw material for cell immobilization for wastewater treatment and plant growth promotion.
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Yabur, R., Bashan, Y. & Hernández-Carmona, G. Alginate from the macroalgae Sargassum sinicola as a novel source for microbial immobilization material in wastewater treatment and plant growth promotion. J Appl Phycol 19, 43–53 (2007). https://doi.org/10.1007/s10811-006-9109-8
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DOI: https://doi.org/10.1007/s10811-006-9109-8