Caracterização reológica das diferentes fases de extrato de inulina de raízes de chicória, obtidas por abaixamento de temperatura

Leite, Juliana T.C.; Park, Kil J.; Ramalho, João R. P.; Furlan, Davi M.

doi:10.1590/s0100-69162004000100023

Cited by 12 publications

(12 citation statements)

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“…The same authors reported that cooling down the concentrated inulin solution, followed by phase separation by physical means would be a good alternative process to obtain a concentrated inulin extract before spray drying. Leite et al. (2004) studied the rheological behavior of this inulin precipitated solution, obtained after a lowering temperature process at 8C and −11C, and they observed that the cooling temperature influenced the apparent viscosity of the samples.…”

Section: Introductionmentioning

confidence: 99%

Rheological Behavior of Concentrated Inulin Solution: Influence of Soluble Solids Concentration and Temperature

Toneli

Park

Murr

et al. 2008

Journal of Texture Studies

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Inulin is a storage polysaccharide present in more than 30,000 vegetable products, including chicory roots, that are considered suitable for industrial application. The objective of this work was to evaluate the influence of temperature and the soluble solids concentration on the rheological behavior of a concentrated inulin solution obtained from a centrifugation process from chicory roots, after freezing at −24C. For all the evaluated soluble solids concentrations, inulin solutions showed a rheological behavior of a highly pseudoplastic fluid, with high resistance to flow at low strain rates followed by a breakdown of the structure when the shear rate increased. The effect of temperature on the apparent viscosity of inulin solutions can be represented by the Arrhenius equation. The rheological behavior of inulin solutions can be represented by the Herschel–Bulkley, Casson, Cross and Power Law equations, where the consistency index increases as temperature rises and the soluble solids concentration as well. PRACTICAL APPLICATIONS The main objective of this work was to analyze the rheological behavior of a concentrated inulin solution obtained from chicory roots, to check the possibility of its application to obtain powder inulin. The concentrated inulin solution was obtained by diffusion in hot water, followed by concentration by evaporation and phase separation conducted by lowering the temperature (−24C) and centrifugation at a velocity of 10,000 rpm for a time interval of 15 min. However, this solution is still going to be processed. Therefore, it is important to know its rheological behavior. The influence of temperature and the soluble solids concentration on the rheological behavior of the concentrated inulin solution was also studied.

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Section: Introductionmentioning

confidence: 99%

Rheological Behavior of Concentrated Inulin Solution: Influence of Soluble Solids Concentration and Temperature

Toneli

Park

Murr

et al. 2008

Journal of Texture Studies

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“…Aiming to a better comparison of the effect of biomass concentration on the rheological behavior of the suspensions, the BG11 medium with pure nitrogen was also evaluated. All measurements were made with three replicates and the arithmetic averages of the results are reported (LEITE et al, 2004).…”

Section: Rheological Characterizationmentioning

confidence: 99%

Rheological behavior of Chlorella sp. e Scenedesmus sp. cultures in different biomass concentrations

Santos

Martins²,

Coimbra³

et al. 2013

Eng. Agríc.

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Studies involving the use of microalgae are increasingly intensifying for the potential they present to produce biofuels, because they are a renewable energy source that does not compete directly with food production, and because they enable the obtaining of a fuel with less environmental impact when compared to fossil fuel. In this context, the use of microalgae is directly associated to its capacity to be produced on a large scale and to be extracted from the culture medium. Rheological studies are important for obtaining the information needed in the elaboration of projects and equipment that will be used in various operations existing in systems of production and extraction of algal biomass. In the evaluation of different levels of dry biomass concentration, studies have been conducted of the rheological behavior of cultures of Chlorella sp. BR001 and Scenedesmus sp. BR003. The Power Law model adjusted well to the data of shear stress as a function of strain rate. In all concentrations the cultures showed non-Newtonian behavior. It was observed to Scenedesmus sp. BR003 little effect of biomass concentration on the apparent viscosity and shear stress.KEYWORDS: microalgae, biomass, production, operation. COMPORTAMENTO REOLÓGICO DE CULTIVOS DE Chlorella sp. E Scenedesmus sp.EM DIFERENTES CONCENTRAÇÕES DE BIOMASSA RESUMO: Estudos envolvendo o uso de microalgas cada vez mais se intensificam, pelo potencial que apresentam para a produção de biocombustíveis, por ser uma fonte de energia renovável que não compete diretamente com a produção de alimentos e por possibilitar a obtenção de um combustível com menor impacto ambiental quando comparado ao combustível fóssil. Neste contexto, a utilização de microalgas está diretamente associada à sua capacidade de ser produzida em larga escala e de ser extraída do meio de cultivo. Os estudos reológicos são importantes para a obtenção das informações necessárias na elaboração dos projetos e dos equipamentos que serão utilizados nas diversas operações existentes nos sistemas de produção e de extração da biomassa algal. Na avaliação de diferentes níveis de concentração de biomassa seca, foram realizados estudos do comportamento reológico de cultivos de Chlorella sp. BR001 e Scenedesmus sp. BR003. O modelo de Lei de Potência ajustou bem aos dados de tensão de cisalhamento em função da taxa de deformação. Em todas as concentrações, os cultivos apresentaram comportamento não newtoniano. Verificou-se para Scenedesmus sp. BR003 pouco efeito da concentração de biomassa na viscosidade aparente e na tensão de cisalhamento. PALAVRAS-CHAVE:microalgas, biomassa, produção, operação.

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“…A inulina é constituída de uma mistura de polímeros e oligômeros lineares de frutose (Leite et al, 2004). Sua ingestão resulta em muitos benefícios à saúde, como a modulação do metabolismo lipídico, a redução do risco de doenças como câncer de cólon e osteoporose, além de aumento significativo dos benefícios das bifidobactérias (Roberfroid, 2007).…”

Section: Introductionunclassified

Efeito da adição inulina sobre as características reológicas e térmicas da farinha de trigo

Barros¹,

Franco²

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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Caracterização reológica das diferentes fases de extrato de inulina de raízes de chicória, obtidas por abaixamento de temperatura

Cited by 12 publications

References 1 publication

Rheological Behavior of Concentrated Inulin Solution: Influence of Soluble Solids Concentration and Temperature

Rheological Behavior of Concentrated Inulin Solution: Influence of Soluble Solids Concentration and Temperature

Rheological behavior of Chlorella sp. e Scenedesmus sp. cultures in different biomass concentrations

Efeito da adição inulina sobre as características reológicas e térmicas da farinha de trigo

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