Influência da temperatura nos parâmetros de modelos bi-paramétricos que predizem isotermas de adsorção de umidade do guaraná (Paullinia cupana) em pó

Oito modelos matemáticos bi-paramétricos, existentes na literatura e com larga aplicação na predição de isotermas de adsorção foram submetidos à análise. O guaraná (Paullinia cupana) em pó objeto deste estudo, foi obtido em "spray dryer", a partir de um extrato hidroalcoólico. Ajustaram-se os pontos experimentais das isotermas de adsorção de umidade do produto à 15°C, 25°C e 35°C, por análise de regressão não-linear. Para estudar o efeito da temperatura nos parâmetros dos modelos utilizaram-se regressões dos tipos: linear, exponencial, logarítmica e inversa. Utilizou-se para fazer os ajustes o aplicativo STATGRAPHICS 5.1. Entre os modelos testados os que apresentam melhores resultados foram as equações de Handerson, Oswin e Mizrahi.

Aplicação de modelos matemáticos bi e tri-paramétricos na predição de isotermas de adsorção de umidade do guaraná (Paullinia cupana) em pó

Doze modelos matemáticos (seis bi-paramétricos e seis tri-paramétricos), amplamente utilizados na predição de isotermas, foram estudados, com o objetivo de predizer isotermas de adsorção de umidade do guaraná (Paullinia cupana) em pó, obtido em "sprey dryer". As isotermas de adsorção de umidade do produto à 15° C, 25° C e 35° C, foram ajustadas por análise de regressão não-linear, usando o aplicativo STATGRAPHICS 5.1. Entre os modelos testados os que apresentaram melhores resultados nos ajustes foram as equações tri-paramétricas de GAB, BET modificada e Anderson, e as equações bi-paramétricas de Handerson e Oswin.

Ordered probit regression analysis of the effect of brand name on beer acceptance by consumers

Ordered probit regression was used to analyze data of sensory acceptance tests designed to study the effect of brand name on the acceptability of beer samples. Eight different brands of Pilsen beer were evaluated by 101 consumers in two sessions of acceptance tests: blind evaluation and brand information test. Ordered probit regression, although a relatively sophisticated technique compared to others used to analyze sensory data, was chosen to enable the observation of consumers' behavior using graphical interpretations of estimated probabilities plotted against hedonic scales. It can be concluded that brands B, C, and D had a positive effect on the sensory acceptance of the product, whereas brands A, F, G, and H had a negative influence on consumers' evaluation of the samples. On the other hand, brand E had little influence on consumers' assessment.

Multivariate study and regression analysis of gluten-free granola

This study developed a gluten-free granola and evaluated it during storage with the application of multivariate and regression analysis of the sensory and instrumental parameters. The physicochemical, sensory, and nutritional characteristics of a product containing quinoa, amaranth and linseed were evaluated. The crude protein and lipid contents ranged from 97.49 and 122.72 g kg-1 of food, respectively. The polyunsaturated/saturated, and n-6:n-3 fatty acid ratios ranged from 2.82 and 2.59:1, respectively. Granola had the best alpha-linolenic acid content, nutritional indices in the lipid fraction, and mineral content. There were good hygienic and sanitary conditions during storage; probably due to the low water activity of the formulation, which contributed to inhibit microbial growth. The sensory attributes ranged from 'like very much' to 'like slightly', and the regression models were highly fitted and correlated during the storage period. A reduction in the sensory attribute levels and in the product physical stabilisation was verified by principal component analysis. The use of the affective test acceptance and instrumental analysis combined with statistical methods allowed us to obtain promising results about the characteristics of gluten-free granola.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1910/09/15 (A6,N17)-1910/09/30.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1913/01/01 (A9,N1)-1913/01/15.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1911/12/01 (A7,N23)-1911/12/15.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1913/07/15 (A9,N14)-1913/08/01.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1911/08/01 (A7,N15)-1911/08/15.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1912/10/01 (A8,N19)-1912/10/15.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1914/07/15 (A10,N14)-1914/08/01.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1911/10/01 (A7,N19)-1911/10/15.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1912/06/01 (A8,N11)-1912/06/15.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1913/05/15 (A9,N10)-1913/06/01.

Le Libre penseur de France et de libre pensée universelle : Journal anticlérical de défense socialiste, républicaine et laïque. Bi-mensuel

1913/07/01 (A9,N13)-1913/07/15.