![rheocalc 32 rheocalc 32](https://i.ytimg.com/vi/X4KCTCIStjk/mqdefault.jpg)
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. Admar Gonzaga, 1346, Itacorubi, CEP 88034-001, Florianópolis, SC, Brazil, e-mail: study aims to optimize an alternative method of extraction of carrageenan without previous alkaline treatment and ethanol precipitation using Response Surface Methodology (RSM).
![rheocalc 32 rheocalc 32](http://www.labomar.net/images/dv3pro.jpg)
Vanessa Webber Sabrina Matos de Carvalho Paulo José Ogliari Leila Hayashi Pedro Luiz Manique Barreto * *ĭepartamento de Ciência e Tecnologia de Alimentos, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina - UFSC, Rod. Otimização da extração de carragenana de Kappaphycus alvarezii utilizando metodologia de superfície de resposta Optimization of the extraction of carrageenan from Kappaphycus alvarezii using response surface methodology A composição química e as análises estruturais mostraram que a carragenana extraída é principalmente κ-carragenana.Īlga marinha biopolímero agente gelificante Nessas condições, as propriedades da carragenana bruta determinadas pelo modelo polinomial foram 31,17%, 158,27 g.cm-2 e 29,5 cP, para rendimento, força do gel e viscosidade, respectivamente, enquanto que em condições experimentais foram 35,8 ± 4,68%, 112,50 ± 4,96 g.cm-2 e 16,01 ± 1,03 cP. As condições ótimas de extração foram 74 ✬ durante 4 horas. Entretanto, a força do gel foi influenciada tanto pelo tempo como pela temperatura de extração. Apenas a temperatura de extração afetou o rendimento e a viscosidade do gel. Os resultados mostraram que os modelos de regressão gerados explicam adequadamente a variação de dados. Além disso, o material extraído foi submetido a análises estruturais por espectroscopia de infravermelho e de ressonância magnética nuclear, e composição química. Os efeitos da temperatura e do tempo de extração sobre o rendimento, força do gel e de viscosidade foram avaliados. A fim de inovar a etapa de isolamento, a secagem por atomização foi adaptada, o que reduziu o tempo para a obtenção do pó seco. The chemical composition, nuclear magnetic resonance spectroscopy, and infrared spectroscopy analyses showed that the crude carrageenan extracted is composed mainly of κ-carrageenan.Įste estudo tem como objetivo otimizar um método alternativo para extração de carragenana sem tratamento alcalino prévio e sem precipitação com etanol através da Metodologia de Superfície de Resposta (RSM). 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.
![rheocalc 32 rheocalc 32](https://5.imimg.com/data5/CY/JT/MY-111289/digital-rheometer-500x500.png)
Furthermore, the extracted material was submitted to structural analysis, by infrared spectroscopy and nuclear magnetic resonance spectroscopy (¹H-NMR), and chemical composition analysis. This study aims to optimize an alternative method of extraction of carrageenan without previous alkaline treatment and ethanol precipitation using Response Surface Methodology (RSM).