Osmotic Dehydration/Impregnation Kinetics of Padrón Pepper (Capsicum annuum L. Longum) with Sodium Chloride Solutions: Process Modelling and Colour Analysis

Abstract

Experimental determinations were carried out to evaluate the dehydration/impregnation mass transfer rates that take place during osmotic processing of Padrón peppers (Capsicum annuum L. var. Longum) with sodium chloride solutions. Several sodium chloride concentrations (from 17 to 26.5% w/w) and temperatures (from 25 to 45°C) and contact times (up to 8h) were selected as variables. Solids gain, weight reduction, water loss, normalised moisture content and normalised solids content were calculated at each experimental condition. These data allowed the calculation of water and salt mass transfer coefficients for modelling the corresponding kinetics. Additionally, pepper colour changes during osmotic contact at different experimental conditions were determined. In all cases, solids gain, weight reduction and water loss increased with temperature and salt concentration. Water loss values are low and water loss/salt gain ratio is also low (as it is usual when sodium chloride solutions are employed as osmotic media). In this way, osmotic process can be basically considered as an impregnation process. In all experimental conditions the colour changes were only significant at the highest temperature assayed and also depended on osmotic concentration.

Keywords

preservation modelling osmotic dehydration impregnation kinetics colour

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References

Ade-Omowaye BIO , Rastogi N.K. , Angersbach A. and Knorr D. (2002). Osmotic dehydration behavior of red paprika . Journal of Food Science 67: 1790-1796 .

Ade-Omowaye BIO , Rastogi N.K. , Angersbach A. and Knorr D. (2003). Combined effects of pulsed electric field pre-treatment and partial osmotic dehydration on air drying behaviour of red bell pepper . Journal of Food Engineering 60: 89-98 .

AOAC (1995). Official Methods of Analysis. 16th edn., Arlington: Association Official of Analytical Chemistry .

Azuara E. , García H.S. and Beristain C.I. (1996). Effect of the centrifugal force on osmotic dehydration of potatoes and apples . Food Research International 29: 195-199 .

Bauer S. , Schulte E. and Thier H.P. (2005). Composition of the surface waxes from bell pepper and eggplant . European Food Research and Technology 220: 5-10 .

Chenlo F. , Moreira R. , Fernández-Herrero C. and Vázquez G. (2006). Mass transfer during osmotic dehydration of chestnut using sodium chloride solutions . Journal of Food Engineering 73: 164-173 .

C.I.E. (1986). Colourimetrie. 2nd edn. Publication C.I.E. no. 15, 2. Vienna, Austria: Central Bureau of the Comission International de L’Eclairage .

Hawkes J. and Flink J.M. (1978). Osmotic concentration of fruit slices prior to freeze dehydration . Journal of Food Processing and Preservation 2: 265-284 .

Heredia-León J.C. , Talamás-Abbud R. , Mendoza-Guzmán V. , Solís-Martínez F. , Jiménez-Castro J. , Barnard J. and Quintero-Ramos A. (2003). Structural and physical properties of dried Anaheim chilli peppers modified by low-temperature blanching . Journal of the Science of Food and Agriculture 84: 59-65 .

10.

Kanner J. , Harel S. and Mendel H. (1979). Content and stability of a-tocopherol in fresh and dehydrated pepper fruits (Capsicum annuum L.) Journal of Agriculture and Food Chemistry 27(6): 1316-1318 .

11.

Khin M.M. , Zhou W. and Perera C. (2005). Development in the combined treatment of coating and osmotic dehydration of food - a review . International Journal of Food Engineering 1: 1-19 .

12.

Magee T.R.A. , Hassaballah A.A. and Murphy W.R. (1983). Internal mass transfer during osmotic dehydration of apple slices in sugar solutions . International Journal of Food Science and Technology 7: 147-152 .

13.

Mataix J., Mañas M., Llopis J., Martínez E.J., Sánchez J. and Borregón A. (1998). Tabla de composición de alimentos españoles. 3rd edn., Granada, Spain: Universidad de Granada.

14.

Oruña-Concha M.J. , González-Castro M.J. , López-Hernández J. and Simal-Lozano J. (1997). Effects of freezing on the pigment content in green beans and Padrón peppers . Zeitschrift fuer Lebensmittel-Untersuchung und-Forschung 205: 148-152 .

15.

Ozen B.F. , Dock L.L. , Ozdemir M. and Floros J.D. (2002). Processing factors affecting the osmotic dehydration of diced green peppers . International Journal of Food Science and Technology 37: 497-202 .

16.

Pérez-Galvez A. and Mínguez-Mosquera I. (2001). Structure-reactivity relationship in the oxidation of carotenoid pigments of the pepper (Capsicum annum L.) . Journal of Agriculture and Food Chemistry 49: 4864-4869 .

17.

Rastogi N.K. , Raghavarao K.S.M.S. , Niranjan K. and Knorr D. (2002). Recent developments in osmotic dehydration: methods to enhance mass transfer . Trends in Food Science and Technology 13: 48-59 .

18.

Sanjuán N. , Lozano M. , García-Pascual P. and Mulet A. (2003). Dehydration kinetics of red pepper (Capsicum annuum L. var. Jaranda) . Journal of the Science of Food and Agriculture 83: 697-701 .

19.

Sereno A.M. , Moreira R. and Martínez E. (2001). Mass transfer coefficients during osmotic dehydration of apple in single and combined aqueous solutions of sugar and salts . Journal of Food Engineering 47: 43-49 .

20.

Sigge G.O. , Hansmann C.F. and Joubert E. (1998). Effect of temperature and relative humidity on the drying rates and drying times of green bell peppers (Capsicum annuum L.) . Drying Technology 16: 1703-1714 .

21.

Vázquez G. , Chenlo F. , Moreira R. and Costoyas A. (2000). Effects of various treatments in the drying kinetics of Muscatel grapes . Drying Technology 18: 2131-2144 .