In these conditions, the carrageenan extract properties determined by the polynomial model were 31.17%, 158.27 g.cm-2, and 29.5 cP for yield, gel strength, and viscosity, respectively, while under the experimental conditions they were 35.8 ± 4.68%, 112.50 ± 4.96 g.cm-2, and 16.01 ± 1.03 cP, respectively. Optimal extraction conditions were 74 ✬ and 4 hours. However, gel strength was influenced by both, extraction time and extraction temperature. Carrageenan yield and gel viscosity were influenced only by the extraction temperature. Results showed that the generated regression models adequately explained the data variation. Furthermore, the extracted material was submitted to structural analysis, by infrared spectroscopy and nuclear magnetic resonance spectroscopy (¹H-NMR), and chemical composition analysis. The effects of extraction time and temperature on yield, gel strength, and viscosity were evaluated. In order to introduce an innovation in the isolation step, atomization drying was used reducing the time for obtaining dry carrageenan powder. This study aims to optimize an alternative method of extraction of carrageenan without previous alkaline treatment and ethanol precipitation using Response Surface Methodology (RSM).
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