2 research outputs found

    Performance Of Nanofiltration Concentration Process In Propolis Extracts [desempenho Do Processo De Concentração De Extratos De Própolis Por Nanofiltração]

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    Propolis is a natural product with great appeal to consumers and researchers due to its important functional properties. Nanofiltration was tested to concentrate the extract derived from propolis produced by Brazilian bees using a water- and an alcohol-based extract. A spiral membrane module with average molar mass cut-off around 150 to 300 g.mol-1 was used. The influence of pressure, temperature and tangential velocity on the permeate flux was evaluated and hysteresis in the membrane was analyzed. An average permeate flux around 12.0 l/h.m2 was obtained for the alcoholic solution and 25.0 l/h.m2 for the aqueous solution. The pressure was varied from 2 to 5.0 bar, providing variation directly proportional to the increase of permeate flux, and also to the increase of fouling, which reached 32% at 5.0 bar. The permeate flux also was directly proportional to the increase in temperature and tangential flow. Hysteresis was measured at 30 and 40 °C and demonstrated the elastic and reversible characteristic of the membrane. The process efficiency was measured by retention index of flavonoids and phenolic compounds. Around 99% of flavonoids in aqueous solution and 90% in ethanol solution were retained, and in the phenolic compounds, around 80 and 24% for the aqueous and the ethanol solutions respectively were retained.301166172Baby, A.R., Accelerated chemical stability data of O/W fluid emulsions containing the extract of Trichilia catigua Adr. Juss (and) Ptychopetalum olacoides Bentham (2007) Revista Brasileira De Ciências Farmacêuticas, 43 (3), pp. 405-412Banvolgyi, S., Concentration of red wine by nanofiltration (2006) Desalination, 198, pp. 8-15Cvek, J., Optimisation of an extraction procedure and chemical characterisation of croatian propolis tintures (2007) Phytochemical Analysis, 18 (5), pp. 451-459Geens, J., Modelling of solute transport in non-aqueous nanofiltration (2006) Journal of Membrane Science, 281 (1-2), pp. 139-148Habert, A.C., Borges, C.P., Nobrega, R., (2006) Processos De Separação Por Membranas, p. 180. , Rio de Janeiro: Ed. e-papersHossain, M.M., Concentration of anthocyanin pigments in blackcurrant pomace by ultrafiltration (2003) Food Australia, 55 (6), pp. 263-266Konishi, S., Análise da influência de agentes solubilizantes na atividade antimicrobiana de extratos de própolis e de uma formulação de spray hidroalcoólico (2004) Mensagem Doce, 75, pp. 22-25Krell, R., (1996) Value-added Products From Beekeeping, , http://www.fao.org/docrep/w0076e/w0076e00.HTM, Rome: FAO, (FAOAgricultural Services Bulletin, 124) Disponível em, Acesso em: 29 janKumazawa, S., Hamasak, T., Nakayama, T., Antioxidant activity of various geographic origins (2004) Food Chemistry, 84, pp. 329-339Maroulis, Z.B., Saravacos, G.D., (2003) Food Process Design, , New York: Marcel Dekker, (cap. 10)Matta, V.M., Moretti, R.H., Cabral, L.M.C., Microfiltration and reverse osmosis for clarification and concentration of acerola juice (2004) Journal of Food Engineering, 61 (3), pp. 477-482Mello, B.C.B.S., (2008) Concentração De Extratos De Própolis Através De Membranas Poliméricas, p. 110. , Campinas, Dissertação (Mestrado) - Universidade Estadual de Campinas - UNICAMPMiranda, K.F., (2005) Estudo Da Concentração De Licopeno Por Ultrafiltração a Partir De Suco De Melancia (Citrullus Vulgaris Schard), p. 149. , Campinas, Dissertação (Mestrado) - Universidade Estadual de Campinas - UNICAMPMoura, F.F., (2000) Contribuição Das Propriedades Físico-químias E Biológicas Da Própolis Produzida Por Apis Mellifera Na Região Nordeste Do Brasil, p. 69. , Campinas, Dissertação (Mestrado) - Universidade Estadual de Campinas - UNICAMPPark, Y.P., Estudo da preparação dos extratos de própolis e suas aplicações (1998) Ciência E Tecnologia De Alimentos, 18 (3), pp. 313-318Peterson, J., Dwyer, J., Flavonoids: Dietary occurrence and biochemical activity (1998) Nutrition Research, 18 (12), pp. 1995-2018Petrus, J.C.C., (1997) Preparação, Modificação E Caracterização De Membranas Assimétricas Para Clarificação De Suco De Frutas, p. 139. , Campinas, Tese (Doutorado) - Universidade Estadual de Campinas - UNICAMPPilipovik, M.V., Riverol, C., Assessing dealcoholization systems based on reverse osmosis (2005) Journal of Food Engineering, 69 (4), pp. 437-441Tsui, E.M., Cheryan, M., Membrane processing of xanthophylls in ethanol extracts of corn (2007) Journal of Food Engineering, 83 (4), pp. 590-595Ushikubo, F.Y., Watanabe, A.P., Viotto, L.A., Effects of operating conditions and enzyme treatment on fouling and polarized layer formation during umbu (Spondias tuberosa Arr. Cam.) juice microfiltration (2006) Desalination, 200 (1-3), pp. 546-548Vincze, I., Stefanovits-Bányaib, E., Vatai, G., Using Nanofiltration and Reverse Osmosis For the Concentration of Seabuckthorn (Hippophae Rhamnoides L.) Juice (2006) Desalination, 200 (1-3), pp. 528-53
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