The Impact of Blanching and High-Pressure Pretreatments on Oil Uptake of Fried Potato Slices

The effect of high-pressure (HP) pretreatment on oil uptake of potato slices is examined in this paper. Potato slices were treated either by HP or thermal blanching, or a combination of thermal blanching followed by HP prior to frying. The effect of HP on starch gelatinization and potato microstructure was assessed by differential scanning calorimeter and environmental scanning electron microscope (ESEM), respectively. After treatments, the slices were fried in sunflower oil at 185 °C for a predetermined time. Frying time was either kept constant (4 min) or varied according to the time needed to reach a desired moisture content of ≈2%. The high pressure applied in this study was found not to be sufficient to cause a significant degree of starch gelatinization. Analysis of the ESEM images showed that blanching had a limited effect on cell wall integrity. HP pretreatment was found to increase the oil uptake marginally. When frying for a fixed time, the highest total oil content was found in slices treated at 200 MPa for 5 min. The oil content was found to increase significantly (p < 0.05) to 41.23 ± 1.82 compared to 29.03 ± 0.21 in the control slices. The same effect of pressure on oil content was found when the time of frying varied. On the other hand, HP pretreatment was found to decrease the frying time required to achieve a given moisture content. Thus, high-pressure pretreatment may be used to reduce the frying time, but not oil uptake.

[1]  N. Chiewchan,et al.  Effect of pretreatment on surface topographical features of vegetables during drying , 2010 .

[2]  P. Sanz,et al.  Effect of high pressure on the reduction of microbial populations in vegetables , 1997, Journal of applied microbiology.

[3]  I. Sam Saguy,et al.  Integrated approach to deep fat frying: engineering, nutrition, health and consumer aspects , 2003 .

[4]  B. Guamis,et al.  The effect of high-pressure treatment at 300 MPa on ripening of ewes' milk cheese , 2008 .

[5]  W. J. Harper,et al.  Effect of high pressure (HP) treatment on microflora and ripening development in Swiss cheese slurries , 2003 .

[6]  Hua Xu,et al.  High Pressure Inactivation Kinetics of Salmonella enterica and Listeria monocytogenes in Milk, Orange Juice, and Tomato Juice , 2009 .

[7]  G. Trystram,et al.  Review of mechanisms, conditions, and factors involved in the oil uptake phenomenon during the deep‐fat frying process , 2008 .

[8]  B. Swanson,et al.  Vitamin C Retention of Potato Fries Blanched in Water , 1983 .

[9]  V. M. Balasubramaniam,et al.  Opportunities and Challenges in High Pressure Processing of Foods , 2007, Critical reviews in food science and nutrition.

[10]  D. Knorr,et al.  Cellular permeabilization of cultured plant tissues by high electric field pulses or ultra high pressure for the recovery of secondary metabolites , 1993 .

[11]  J. Cheftel,et al.  Bacterial Growth During Chilled Storage of Pressure-Treated Minced Meat , 1994 .

[12]  W. Błaszczak,et al.  Effect of high pressure on the structure of potato starch , 2005 .

[13]  M. Farid,et al.  Determining Internal Oil Uptake and Water Content of Fried Thin Potato Crisps , 2000 .

[14]  K. Niranjan,et al.  Enhanced Mass Transfer During Osmotic Dehydration of High Pressure Treated Pineapple , 1998 .

[15]  F. Pedreschi,et al.  Oil partition in pre-treated potato slices during frying and cooling , 2007 .

[16]  Dietrich Knorr,et al.  Potato Cubes Response to Water Blanching and High Hydrostatic Pressure , 1993 .

[17]  I Sam Saguy,et al.  Mechanism of oil uptake during deep-fat frying and the surfactant effect-theory and myth. , 2006, Advances in colloid and interface science.

[18]  J. Aguilera,et al.  Structure and Texture Properties of Fried Potato Products , 2006 .

[19]  A. Sebok,et al.  Studies of the potato microstructure during blanching , 1999 .

[20]  G. Arroyo,et al.  High Hydrostatic Pressure Effects on Vegetable Structure , 1998 .

[21]  D. Knorr,et al.  Effects of high pressures treatment on starches , 1996 .

[22]  S. Sablani,et al.  Comparison of Water Blanching and High Hydrostatic Pressure Effects on Drying Kinetics and Quality of Potato , 2005 .

[23]  P. Hozák,et al.  Comparison of methods of high-pressure freezing and automated freeze-substitution of suspension cells combined with LR White embedding , 2010, Histochemistry and Cell Biology.

[24]  D. Rade,et al.  Decreasing of oil absorption in potato strips during deep fat frying , 2004 .

[25]  M. Cano,et al.  High pressure and temperature effects on enzyme inactivation in strawberry and orange products , 1997 .

[26]  H. Diehl,et al.  The Effect of High Pressures on Bacteria , 1918 .

[27]  J. Torres,et al.  Ultra-High Pressure Pasteurization of Fresh Cut Pineapple. , 1994, Journal of food protection.

[28]  M. E. Castell-Perez,et al.  Deep Fat Frying: Fundamentals and Applications , 1999 .

[29]  F. Pedreschi,et al.  Kinetics of oil uptake during frying of potato slices : Effect of pre-treatments , 2006 .

[30]  A. Kelly,et al.  The fate of Listeria monocytogenes during the manufacture of Camembert-type cheese: A comparison between raw milk and milk treated with high hydrostatic pressure , 2008 .

[31]  L. Otero,et al.  High-pressure shift freezing: recrystallization during storage , 2008 .

[32]  Cristóbal N. Aguilar,et al.  Low-temperature Blanch Improves Textural Quality of French-fries , 1997 .

[33]  M. H. Gamble,et al.  Relationship between oil uptake and moisture loss during frying of potato slices from c. v. Record U.K. tubers , 2007 .

[34]  J. Jane,et al.  Effect and mechanism of ultrahigh hydrostatic pressure on the structure and properties of starches , 2002 .

[35]  D. Knorr,et al.  The impact of pressure, temperature and treatment time on starches: pressure-induced starch gelatinisation as pressure time temperature indicator for high hydrostatic pressure processing , 2005 .

[36]  Tomas Norton,et al.  Recent Advances in the Use of High Pressure as an Effective Processing Technique in the Food Industry , 2008 .

[37]  Chantal Smout,et al.  Effects of high-pressure pretreatment and calcium soaking on the texture degradation kinetics of carrots during thermal processing , 2006 .

[38]  M. M. Blumenthal.  A new look at the chemistry and physics of deep-fat frying , 1991 .

[39]  S. Devahastin,et al.  Fractal Characterization of Some Physical Properties of a Food Product under Various Drying Conditions , 2007 .

[40]  D. Knorr,et al.  Rehydration Kinetics of High-Pressure Pretreated and Osmotically Dehydrated Pineapple , 2000 .

[41]  Fernanda A. R. Oliveira,et al.  Structural changes and shrinkage of potato during frying , 2001 .

[42]  J. C. Coquille,et al.  Microscopic study of starch gelatinization under high hydrostatic pressure , 1996 .

[43]  H. Ramaswamy,et al.  Effect of high pressure processing on the texture of selected fruits and vegetables , 1998 .

[44]  N. Chiewchan,et al.  Effects of drying temperature and surface characteristics of vegetable on the survival of salmonella. , 2009, Journal of food science.

[45]  Songming Zhu,et al.  Compression Heating and Temperature Control for High-Pressure Destruction of Bacterial Spores: An Experimental Method for Kinetics Evaluation , 2010 .

[46]  D. L. Pyle,et al.  Structure oil-absorption relationships during deep-fat frying , 2003 .

[47]  S. Sahin,et al.  Advances in Deep-Fat Frying of Foods , 2008 .

[48]  B. Swinburn,et al.  A Review of Factors Affecting Fat Absorption in Hot Chips , 2001, Critical reviews in food science and nutrition.

[49]  A. Eliasson,et al.  Gelatinization and retrogradation of potato (Solanum tuberosum) starch in situ as assessed by differential scanning calorimetry (DSC). , 2003 .