Artigos Científicos - FEA/ITEC

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3359

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    Adsorption capacity of phenolic compounds onto cellulose and xylan
    (Universidade Federal do Pará, 2015-06) COSTA, Telma dos Santos; ROGEZ, Hervé Louis Ghislain; PENA, Rosinelson da Silva
    The interaction between three phenolic compounds (catechin, caffeic acid and ferulic acid) onto two dietary fibres (cellulose and xylan) has been evaluated to inquire possible interferences on the biodisponibility of phenolic compounds. The adsorption kinetics were performed using solutions containing 100 mg/L of phenolic compounds during a contact time ranging between 10 and 120 minutes at pH 2.0, 4.5, and 7.0. After the kinetics, isotherms were obtained using phenolic compounds concentration ranging between 10 and 80 mg/L during 60 minutes, at pH 2.0 and 7.0 and temperature of 36 °C. Results indicate that adsorbed quantities mainly changed in function of pH, however the maximum adsorption was only of 0.978 mg of caffeic acid/g of xylan at pH 2 and after 60 min. Redlich-Peterson model were able to predict the adsorption isotherms of all phenolic compounds onto cellulose, except for caffeic acid at pH 7.0. The low adsorption capacities observed suggest that both dietary fibres are unable to compromise the biodisponibility of phenolic compounds, especially in the small intestine, where they are partially absorbed.
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    Estudo das propriedades físico-químicas e microbiológicas no processamento da farinha de mandioca do grupo d'água
    (Universidade Federal do Pará, 2007-06) CHISTÉ, Renan Campos; COHEN, Kelly de Oliveira; MATHIAS, Erla de Assunção; RAMOA JÚNIOR, Afonso Guilherme Araújo
    The aim of this work was to define the physical-chemical characterization of the processing stages of cassava flour from the water group and identify microbiological and physical contaminants. The samples were collected in a flour mill located in Castanhal, Pará. The selected points were: peeled and washed cassava after (MD); triturated cassava (MT), pressed cassava (MP); and cassava flour (FM) analysing humidity and acidity at all the points of collection and for the cassava flour, ash, water activity, proteins, fats and starch. The initial humidity of the MD sample was from 59.22 to 62.64%, obtaining the flour humidity from 1.43 to 2.12%. The initial acidity was high (from 4.91 to 5.96 meq NaOH.100 g -1) in the MD, gradually increasing until attaining flour (6.54 to 10.19 meq NaOH.100 g -1), whereby legislation requires 3 meq NaOH.100 g -1. For the starch, the value was from 73.19 to 75.31% according to legislation (minimum 70%). The flour showed an acceptable value for the legislation to Coliformes (<3 NMP.g -1). For the Bacillus cereus, the flour showed a value of <1 x 101 UFC.g -1, allowing for the legislation and absence of Salmonella. The flour showed dirtiness.
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    Qualidade da farinha de mandioca do grupo seca
    (Universidade Federal do Pará, 2006-12) CHISTÉ, Renan Campos; COHEN, Kelly de Oliveira; MATHIAS, Erla de Assunção; RAMOA JÚNIOR, Afonso Guilherme Araújo
    In the north of Brazil, cassava flour is produced in small-scale processing units called ´flour mill houses'. These processing units have difficulty in complying with current legislation due to processing methods and to poor sanitary conditions. The objective of this study is to evaluate the quality standard of cassava flour from the dry group, subgroup "fina", type 1. Ten samples of cassava flour were collected from the main supermarkets and free markets in Belém-PA, and the physical-chemical, microbiological and dirt research analyses were carried out. According to Regulation nº 554 from 08/30/1995 issued by the State Agriculture Secretariat, all cassava flour samples analyzed showed total acidity values above the permitted standard (3 meq NaOH/100 g) and five samples were below the minimum tolerance level required for starch (75%). According to Resolution RDC nº 12 from 01/02/2001 of the National Sanitary Control Agency, all cassava flour samples were under the acceptable standards for microbiological contaminants. According to Resolution CNNPA nº 12 from 1978, eight of the analyzed samples did not comply to the permitted standards because they showed dirt.
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