The objective of this work was to investigate the potential use of pulsed electric field (PEF) in combination with osmotic dehydration (OD) as a pre-freezing step and to evaluate the effect on quality characteristics and shelf life of frozen kiwifruit. Peeled kiwifruit was subjected to PEF (1.8 kV/cm), sliced and treated in OD-solution (containing glycerol, maltodextrin, trehalose, ascorbic acid, calcium chloride, citric acid, sodium chloride; 1/5 (wfruit/wsolution)) for 30 and 60 min at 35 °C. Combined, PEF only and OD only treated samples as well as nontreated and blanched (80 °C, 60 s) samples were frozen and stored at constant (-5, -10, -15, -25 °C) and dynamic temperature conditions (-18 °C-3 d, -8 °C-2.5 d, -15 °C-3 d). Quality of frozen samples was evaluated by means of drip loss, colour, texture, vitamin C and sensory evaluation (1-9 scale); and shelf life (SL) was calculated. Nontreated and blanched samples presented high drip loss and tissue softening (instrumentally measured as Fmax decrease). The tissue integrity was well retained in all osmotically pretreated samples. PEF pretreatment caused increase of fruit whiteness (increase of L value) and yellowness (a and/or b value increase); SL calculation was based on colour change. All OD samples had high vitamin content (24.6 mg/100 g fresh material compared to 138-154 mg/100 g osmodehydrated material); PEF led to 93% (of the initial) vitamin retention; blanched samples showed the lowest retention (86.9% of the initial) (criteria for SL calculation). OD and combined PEF-OD treatment increased the shelf life of frozen kiwifruit (up to 3 times; based on sensorial criteria). The developed kinetic models for colour change, vitamin loss, and sensory quality deterioration were validated at dynamic temperature conditions. PEF pretreated OD (at significantly shorter time, 30 min compared to 60 min) kiwifruits retained optimum quality and sensory characteristics. PEF and OD could be used as a preprocessing step of good quality, longer shelf life kiwi sliced frozen products.
Ade-Omowaye B, Taiwo K, Eshtiaghi N, Angersbach A, Knorr D. Comparative evaluation of the effects of pulsed electric field and freezing on cell membrane permeabilisation and mass transfer during dehydration of red bell peppers. Innovative Food Science & Emerging Technologies. 2003. p. 177–88.
2.
Ade-Omowaye B, Talens P, Angersbach A, Knorr D. Kinetics of osmotic dehydration of red bell peppers as influenced by pulsed electric field pretreatment. Food Research International. 2003. p. 475–83.
3.
Amami E, Vorobiev E, Kechaou N. Effect of pulsed electric field on the osmotic dehydration and mass transfer kinetics of apple tissue. Drying Technology. 2005. p. 581–95.
4.
Amami E, Vorobiev E, Kechaou N. European Symposium on Apple Processing. LWT-Food Science and Technology. 2006. p. 1014–21.
5.
Bressa F, Dalla Rosa M, Mastrocola D. ACTA HORTICULTURAE. 3rd International Symposium on Kiwifruit. ARISTO-TLE UNIV; 1997. p. 649–54.
6.
Cao H, Zhang M, Mujumdar A, Du W, Sun J. Optimization of osmotic dehydration of kiwifruit. Drying Technology. 2006. p. 89–94.
7.
Castro-Giraldez M, Tylewicz U, Fito P, Dalla Rosa M, Fito P. Analysis of chemical and structural changes in kiwifruit (actinidia deliciosa cv hayward) through the osmotic dehydration. Journal of Food Engineering. 2011. p. 599–608.
8.
Dermesonlouoglou E, Giannakourou M, Taoukis P. Stability of dehydrofrozen tomatoes pretreated with alternative osmotic solutes. Journal of Food Engineering. 2007. p. 272–80.
9.
Dermesonlouoglou E, Giannakourou M, Taoukis P. Kinetic study of the effect of the osmotic dehydration pretreatment with alternative osmotic solutes to the shelf life of frozen strawberry. Food and Bioproducts Processing. 2016. p. 212–21.
10.
Dermesonlouoglou E, Pourgouri S, Taoukis P. Kinetic study of the effect of the osmotic dehydration pretreatment to the shelf life of frozen cucumber. Innovative Food Science & Emerging Technologies. 2008. p. 542–9.
11.
Dermesonlouoglou E, Zachariou I, Andreou V, Taoukis P. 29th International Conference of the European-Federation-of-Food-Science-and-Technology (EFFoST). Food and Bioproducts Processing. 2016. p. 535–44.
12.
Du G, Li M, Ma F, Liang D. Antioxidant capacity and the relationship with polyphenol and vitamin c in actinidia fruits. Food Chemistry. 2009. p. 557–62.
13.
Escriche I, Garcia-Pinchi R, Andres A, Fito P. Osmotic dehydration of kiwifruit (actinidia chinensis): fluxes and mass transfer kinetics. Journal of Food Process Engineering. 2000. p. 191–205.
14.
Ferrando M, Spiess W. Cellular response of plant tissue during the osmotic treatment with sucrose, maltose, and trehalose solutions. Journal of Food Engineering. 2001. p. 115–27.
15.
Giannakourou M, Taoukis P. Kinetic modelling of vitamin c loss in frozen green vegetables under variable storage conditions. Food Chemistry. 2003. p. 33–41.
16.
Gianotti A, Sacchetti G, Guerzoni M, Dalla Rosa M. Microbial aspects on short-time osmotic treatment of kiwifruit. Journal of Food Engineering. 2001. p. 265–70.
17.
ISO 8586-1: Sensory analysis -general guidance for the selection, training and monitoring of selected assessors and expert sensory assessors. International Organization for Standardization; 2012.
18.
Jemai A, Vorobiev E. Effect of moderate electric field pulses on the diffusion coefficient of soluble substances from apple slices. International Journal of Food Science and Technology. 2002. p. 73–86.
19.
Kaya A, Aydm O, Kolayli S. Food and Bioproducts Processing. 2010. p. 165–73.
20.
Knorr D, Angersbach A. Impact of high-intensity electric field pulses on plant membrane permeabilization. Trends in Food Science & Technology. 1998. p. 185–91.
21.
Knorr D, Geulen M, Grahl T, Sitzmann W. Food application of highelectric-field pulses. Trends in Food Science & Technology. 1994. p. 90240–2.
22.
Krupa T, Latocha P, Liwinska A. Changes of physicochemical quality, phenolics and vitamin c content in hardy kiwifruit (actinidia arguta and its hybrid) during storage. Scientia Horticulturae. 2011. p. 410–7.
23.
Latocha P, Krupa T, Wolosiak R, Worobiej E, Wilczak J. Antioxidant activity and chemical difference in fruit of different actinidia sp. International Journal of Food Sciences and Nutrition. 2010. p. 381–94.
24.
Lebovka N, Bazhal M, Vorobiev E. Innovative Food Science & Emerging Technologies. 2001. p. 113–25.
25.
Leong L, Shui G. An investigation of antioxidant capacity of fruits in singapore markets. Food Chemistry. 2002. p. 69–75.
26.
Lim J. Hedonic scaling: a review of methods and theory. Food Quality and Preference. 2011. p. 733–47.
27.
Montefiori M, Mcghie T, Hallett I, Costa G. Changes in pigments and plastid ultrastructure during ripening of green-fleshed and yellow-fleshed kiwifruit. Scientia Horticulturae. 2009. p. 377–87.
Tagawa A. Impacts of hot air and vacuum drying on the quality attributes of kiwifruit slices. Journal of Food Engineering. 2014. p. 51–8.
30.
Panarese V, Tylewicz U, Santagapita P, Rocculi P, Dalla Rosa M. Isothermal and differential scanning calorimetries to evaluate structural and metabolic alterations of osmo-dehydrated kiwifruit as a function of ripening stage. Innovative Food Science & Emerging Technologies. 2012. p. 66–71.
31.
Parniakov O, Bals O, Lebovka N, Vorobiev E. Effects of pulsed electric fields assisted osmotic dehydration on freezing-thawing and texture of apple tissue. Journal of Food Engineering. 2016. p. 32–8.
32.
Rastogi N, Eshtiaghi M, Knorr D. Accelerated mass transfer during osmotic dehydration of high intensity electrical field pulse pretreated carrots. Journal of Food Science. 1999. p. 1020–3.
33.
Stanley R, Wegrzyn T, Saleh Z. Proceedings of the 6th international symposium on kiwifruit, vols 1 and. 2007. p. 795–9.
34.
Stec M, Hodgson J, Macrae E, Triggs C. Role of fruit firmness in the sensory evaluation of kiwifruit (actinidia-deliciosa cv hayward). Journal of the Science of Food and Agriculture. 1989. p. 417–33.
35.
Taiwo K, Angersbach A, Ade-Omowaye B, Knorr D. Effects of pretreatments on the diffusion kinetics and some quality parameters of osmotically dehydrated apple slices. Journal of Agricultural and Food Chemistry. 2001. p. 2804–11.
36.
Talens P, Escriche I, Martinez-Navarrete N, Chiralt A. Influence of osmotic dehydration and freezing on the volatile profile of kiwi fruit. Food Research International. 2003. p. 635–42.
37.
Tedjo W, Taiwo K, Eshtiaghi M, Knorr D. Comparison of pretreatment methods on water and solid diffusion kinetics of osmotically dehydrated mangos. Journal of Food Engineering. 2002. p. 133–42.
38.
Tocci A, Mascheroni R. Some thermal properties of fresh and osmotically dehydrated kiwifruit above and below the initial freezing temperature. Journal of Food Engineering. 2008. p. 20–7.
39.
Tsironi T, Dermesonlouoglou E, Giannakourou M, Taoukis P. Shelf life modelling of frozen shrimp at variable temperature conditions. LWT-Food Science and Technology. 2009. p. 664–71.
40.
Tylewicz U, Fito P, Castro-Giraldez M, Fito P, Rosa M. Analysis of kiwifruit osmodehydration process by systematic approach systems. Journal of Food Engineering. 2011. p. 438–44.
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