15.01.2015 Views

Isotermas de Sorção de Umidade e Estudo de Estabilidade de ...

Isotermas de Sorção de Umidade e Estudo de Estabilidade de ...

Isotermas de Sorção de Umidade e Estudo de Estabilidade de ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

FADINI, A. et al.<br />

<strong>Isotermas</strong> <strong>de</strong> Sorção <strong>de</strong> Umida<strong>de</strong> e<br />

<strong>Estudo</strong> <strong>de</strong> Estabilida<strong>de</strong> <strong>de</strong> Macadâmias<br />

Drageadas<br />

• As umida<strong>de</strong>s relativas <strong>de</strong> 43,16 e 57,57% foram<br />

<strong>de</strong>terminadas como os valores limitantes para a manutenção<br />

da qualida<strong>de</strong> dos produtos salgado e doce, respectivamente;<br />

• A equação <strong>de</strong> GAB foi a que melhor se ajustou para<br />

as duas isotermas, seguida das equações <strong>de</strong> BET e Oswin.<br />

AGRADECIMENTOS<br />

Os autores agra<strong>de</strong>cem ao CNPq (Conselho Nacional<br />

<strong>de</strong> Desenvolvimento Científico e Tecnológico) pelo suporte<br />

financeiro ao projeto.<br />

REFERÊNCIAS BIBLIOGRÁFICAS<br />

BRAY, W. H. Water Vapor Pressure Control with Aqueous Solutions of<br />

Sulfuric Acid. Journal of Materials. JMLSA, Vol 5, Nº 1, March<br />

1970, pp. 233-248.<br />

GREENSPAN, L. Humidity fixed points of binary saturated aqueous<br />

solutions. J. of Res. of the Nat. Bur. Stand. A. Phys. & Chem., v.<br />

81A, p. 89-96, 1977.<br />

HORWITZ, W. (Ed.) Official Methods of Analysis of The Association<br />

Analytical Chemists. 17 th ed. Gaithersburg, Maryland: AOAC,<br />

2000a. v. 2, cap. 40, met. 925.40, p. 1.<br />

HORWITZ, W. (Ed.) Official Methods of Analysis of The Association<br />

Analytical Chemists. 17 th ed. Gaithersburg, Maryland: AOAC,<br />

2000b. v. 2, cap. 40, met. 948.22, p. 1.<br />

HORWITZ, W. (Ed.) Official Methods of Analysis of The Association<br />

Analytical Chemists. 17 th ed. Gaithersburg, Maryland: AOAC,<br />

2000c. v. 2, cap. 40, met. 950.48, p. 1.<br />

HORWITZ, W. (Ed.) Official Methods of Analysis of The Association<br />

Analytical Chemists. 17 th ed. Gaithersburg, Maryland: AOAC,<br />

2000d. v. 2, cap. 31, met. 972.15, p. 1.<br />

KITIC, D. et al. Theoretical prediction of the water activity of standard<br />

saturated salt solutions at various temperatures. Journal of Food<br />

Science, v. 51, p. 1037-1041, 1986.<br />

LABUZA, T. P. Moisture Sorption: Practical Aspects of Isotherm<br />

Measurement and Use. American Association of Cereal Chemists,<br />

St. Paul, Minnesota. Practical Applications, Braseq, 74 p.,1984.<br />

LABUZA, T. P. Sorption phenomena in foods. Food Technology, 22<br />

(3): 15-24, 1968.<br />

LABUZA, T. P.; HYMAN, C. R. Moisture migration and control in multidomain<br />

foods. Trends Food Sci. Technol. 9:47-55, 1998.<br />

LOMAURO, C. J. et al. Evaluation of food moisture sorption isotherm<br />

equations. Part I: Fruit, vegetables and meat products. Lebensmittel-<br />

Wissenschaft and Technologies, v. 18, p. 112-22, 1985.<br />

MOURA, S. C. S. R.; GERMER, S. P. M. Predição <strong>de</strong> ativida<strong>de</strong> <strong>de</strong> água<br />

em alimentos e mo<strong>de</strong>lação matemática <strong>de</strong> isotermas <strong>de</strong> sorção. In:<br />

JARDIM, D. C. P.; GERMER, S. P. M. Ativida<strong>de</strong> <strong>de</strong> água em alimentos.<br />

Campinas: Instituto <strong>de</strong> Tecnologia <strong>de</strong> Alimentos, 1997. Cap. 12.<br />

OKOS, M. R. Physical and Chemical Properties of Foods, ASAE<br />

Publication, American Society of Agricultural Engineers, USA,<br />

1986, 407p.<br />

OSWIN, C. R. The kinetics of package life, III, the isotherms. Journal<br />

Chem. Ind., London, v. 65, p. 419. 1946.<br />

SCHÄR, W.; RUËGG, M. The Evaluation of GAB Constants from Water<br />

Sorption Data. Lebensmittel-Wissenschaft und-Technologie, v. 18,<br />

p. 225-229, 1985.<br />

SILVA, M. G. Macadâmia Nacional: Tocoferóis e caracaterização<br />

físico-química. Campinas, 2003. 69p. Tese (Mestrado). Faculda<strong>de</strong><br />

<strong>de</strong> Engenharia <strong>de</strong> Alimentos UNICAMP.<br />

TEIXEIRA NETO, R. O. Ativida<strong>de</strong> <strong>de</strong> água e transformações <strong>de</strong> alimentos.<br />

In: JARDIM, D. C. P.; GERMER, S. P. M. Ativida<strong>de</strong> <strong>de</strong> água em<br />

alimentos. Campinas: Instituto <strong>de</strong> Tecnologia <strong>de</strong> Alimentos, 1997a.<br />

Cap. 2.<br />

TEIXEIRA NETO, R. O. <strong>Isotermas</strong> <strong>de</strong> sorção <strong>de</strong> umida<strong>de</strong>: técnicas <strong>de</strong><br />

obtenção e aplicações. In: JARDIM, D. C. P.; GERMER, S. P. M.<br />

Ativida<strong>de</strong> <strong>de</strong> água em alimentos. Campinas: Instituto <strong>de</strong> Tecnologia<br />

<strong>de</strong> Alimentos, 1997b. Cap. 6.<br />

TELIS-ROMERO, J. et al. Enthalpy-entropy compensation based on<br />

isotherms of mango. Cien. Tecnol. Aliment., Campinas, 25(2):<br />

297-303, 2005.<br />

TREYBAL, R. E. Drying Mass Transfer Operations. In: Mass-Transfer<br />

Operations. New York: McGraw-Hill, 1968, p. 569-575.<br />

WANG, N.; BRENNAN, J. G. Moisture sorption isotherm characteristics<br />

of potatoes at four temperatures. Journal of Food Engineering,<br />

v. 14, n. 1, 1991.<br />

WOODROOF, J. G. Macadâmia nuts. In: Tree nuts: Production,<br />

Processing, Products. Westport, Conn., Avi, 1967. v.1. p. 13.356.<br />

Braz. J. Food Technol., v.9, n.2, p. 83-88, abr./jun. 2006 88

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!