Selective extraction from carrot slices by pressing and washing enhanced by pulsed electric fields

Abstract This work discusses efficiency of the pulsed electric field (PEF)-induced selective extraction of components from carrot slices by different combination of their washing and pressing treatment. The experiments were carried out using a laboratory filter-press cell, equipped with PEF-treatment system operated at moderate electric field strength ( E  = 250–1000 V/cm) and at the constant pressure ( P  = 5 bars). The extraction was done by application of the washing–pressing (W–P) and pressing–washing–pressing (P–W–P) procedures to slices of different size. The decrease of the slice size was accompanied by enhancement of the extraction kinetics and rising of juice turbidity. The PEF application allowed to increase the juice yield and to increase the juice °Brix, however, these effects were noticeable only for larger slices with small degree of initial damage. The time of PEF application influenced the extraction kinetics, turbidity and °Brix of juice. The PEF application before W–P or P–W–P procedures allowed to reach maximum of the extraction rate and juice purity, but it required the highest energy consumption. The proposed method of PEF-assisted pressure extraction seems to be promising for selective extraction of different components from the soft cellular tissues.

[1]  E. Vorobiev,et al.  Constant Rate Expressing of Juice from Biological Tissue Enhanced by Pulsed Electric Field , 2004 .

[2]  E. Vorobiev,et al.  Analysis of juice colour and dry matter content during pulsed electric field enhanced expression of soft plant tissues , 2007 .

[3]  R. Carle,et al.  The role of process technology in carrot juice cloud stability , 2003 .

[4]  T. Beveridge,et al.  Opalescent and Cloudy Fruit Juices: Formation and Particle Stability , 2002, Critical reviews in food science and nutrition.

[5]  G. Barbosa‐Cánovas,et al.  Effect of PEF and heat pasteurization on the physical–chemical characteristics of blended orange and carrot juice , 2006 .

[6]  Diego B. Genovese,et al.  Contribution of colloidal forces to the viscosity and stability of cloudy apple juice , 2006 .

[7]  Dietrich Knorr,et al.  Accelerated Mass Transfer During Osmotic Dehydration of High Intensity Electrical Field Pulse Pretreated Carrots , 1999 .

[8]  Gustavo V. Barbosa-Cánovas,et al.  Novel food processing technologies. , 2004 .

[9]  E. Vorobiev,et al.  Effect of moderate thermal and pulsed electric field treatments on textural properties of carrots, potatoes and apples , 2004 .

[10]  E. Vorobiev,et al.  Modelling of Solute Aqueous Extraction from Carrots subjected to a Pulsed Electric Field Pre-treatment , 2005 .

[11]  E. Vorobiev,et al.  Temperature enhanced electroporation under the pulsed electric field treatment of food tissue , 2005 .

[12]  G. Barbosa‐Cánovas,et al.  Pulsed electric field-assisted extraction of juice from food plants. , 2004 .

[13]  U. Zimmermann,et al.  Electrical breakdown, electropermeabilization and electrofusion. , 1986, Reviews of physiology, biochemistry and pharmacology.

[14]  K. Kaack,et al.  Low frequency ultrasonics for texture measurements in carrots (Daucus carota L.) in relation to water loss and storage , 1998 .

[15]  J. Cheftel,et al.  Food processing by pulsed electric fields. II. Biological aspects , 1999 .

[16]  A. Kilara,et al.  Clarification of Apple Juice , 1989 .

[17]  S. Sastry,et al.  Effects of moderate electrothermal treatments on juice yield from cellular tissue , 2002 .

[18]  E. Vorobiev,et al.  Enhanced expression of juice from soft vegetable tissues by pulsed electric fields: consolidation stages analysis , 2003 .

[19]  Marybeth Lima,et al.  The effect of ohmic heating on vacuum drying rate of sweet potato tissue. , 2003, Bioresource technology.

[20]  G. Mittal Thermal Softening of Potatoes and Carrots , 1994 .

[21]  G. Maia,et al.  Physical-chemical changes during extraction and clarification of guava juice , 1995 .

[22]  M. Fincan,et al.  Pulsed electric field treatment for solid-liquid extraction of red beetroot pigment , 2004 .

[23]  H. Schwartzberg Expression of Fluid from Biological Solids , 1997 .

[24]  P. Poel,et al.  Sugar Technology, Beet and Cane Sugar Manufacture , 1998 .

[25]  D. Knorr,et al.  High electric field pulse pretreatment: potential for sugar beet processing , 2002 .

[26]  T. Beveridge,et al.  Pear Juice Production from Heated Pear Mashes , 1986 .

[27]  T. Lam,et al.  Covalent Cross-Links in the Cell Wall , 1994, Plant physiology.

[28]  Arun S. Mujumdar,et al.  Research and Development in Drying: Recent Trends and Future Prospects , 2004 .

[29]  D. L. Downing Processed apple products , 1995 .

[30]  P. Dejmek,et al.  Effect of pulsed electric field pretreatment on solid-liquid expression from potato tissue. , 2005 .

[31]  Araceli Redondo-Cuenca,et al.  Effects of processing conditions on soluble sugars content of carrot, beetroot and turnip , 1999 .

[32]  C. Cortés,et al.  Ascorbic acid stability during refrigerated storage of orange–carrot juice treated by high pulsed electric field and comparison with pasteurized juice , 2006 .