Characteristics of Convective Drying of Pepino Fruit (Solanum muricatum Ait.): Application of Weibull Distribution

The aim of this research was to study the behaviour of the drying kinetics of pepino fruit (Solanum muricatum Ait.) at five temperatures (50, 60, 70, 80 and 90 °C). In addition, desorption isotherms were determined at 20, 40 and 60 °C over a water activity range from 0.10 to 0.90. The Guggenheim, Anderson and de Boer model was suitable to depict the desorption data. A monolayer moisture content from 0.10 to 0.14 g water g−1 d.m. was reported. The equations of Newton, Henderson–Pabis, Modified Page, Wang–Singh, Modified Henderson–Pabis, Logarithmic as well as standardised Weibull were tested for modelling drying kinetics. Besides, Fick’s second law model was used to calculate the water diffusion coefficient which increased with temperature from 2.55 to 7.29 × 10−10 m2 s−1, with estimated activation energy of 27.11 kJ mol−1. The goodness of fit of the models was evaluated using sum squared error and chi-square statistical tests. The comparison of the experimental moisture values with respect to the calculated values showed that the standardised Weibull model presented the best goodness of fit, showing that this equation is very accurate for simulating drying kinetics for further optimisation of drying times.

[1]  A. Farhat,et al.  Desorption Isotherms and Isosteric Heat of Three Tunisian Date Cultivars , 2008 .

[2]  E. Akpinar.  Determination of suitable thin layer drying curve model for some vegetables and fruits , 2006 .

[3]  Digvir S. Jayas,et al.  Sorption Isotherms of Tomato Slices and Onion Shreds , 2003 .

[4]  I. Saguy,et al.  Normalized Weibull distribution for modeling rehydration of food particulates , 2003 .

[5]  S. Babalis,et al.  Influence of the drying conditions on the drying constants and moisture diffusivity during the thin-layer drying of figs , 2004 .

[6]  S. A. Giner.  Influence of Internal and External Resistances to Mass Transfer on the constant drying rate period in high-moisture foods , 2009 .

[7]  Min Ji Lee,et al.  Effect of drying method on the moisture sorption isotherms for Inonotus obliquus mushroom , 2008 .

[8]  Roberto Lemus-Mondaca,et al.  MASS TRANSFER KINETICS DURING CONVECTIVE DRYING OF RED PEPPER VAR. HUNGARIAN (CAPSICUM ANNUUM L.): MATHEMATICAL MODELING AND EVALUATION OF KINETIC PARAMETERS , 2008 .

[9]  Fernanda A. R. Oliveira,et al.  Stochastic approach to the modelling of water losses during osmotic dehydration and improved parameter estimation , 2001 .

[10]  Siaw Kiang Chou,et al.  PH—Postharvest Technology: Modelling the Moisture and Temperature Distribution within an Agricultural Product undergoing Time-varying Drying Schemes , 2002 .

[11]  Dursun Pehlivan,et al.  Modelling of drying kinetics of single apricot , 2003 .

[12]  A. Midilli,et al.  Mathematical modeling of thin layer drying of pistachio by using solar energy , 2003 .

[13]  Orhan Aydin,et al.  Drying Kinetics of Red Delicious Apple , 2007 .

[14]  T. G. Kieckbusch,et al.  Ascorbic Acid Thermal Degradation during Hot Air Drying of Camu-Camu (Myrciaria dubia [H.B.K.] McVaugh) Slices at Different Air Temperatures , 2005 .

[15]  A. Andrés,et al.  Kinetic study of dehydration and desorption isotherms of red alga Gracilaria , 2008 .

[16]  K. Saçılık,et al.  The thin layer drying characteristics of organic apple slices , 2006 .

[17]  SORPTION ISOTHERMS OF TURKISH DELIGHT , 1998 .

[18]  İbrahim Doymaz,et al.  Convective drying kinetics of strawberry , 2008 .

[19]  S. Sahin,et al.  Physical properties of foods , 2006 .

[20]  P. K. Chattopadhyay,et al.  Hot Air Puffing Kinetics for Soy-fortified Wheat-based Ready-to-Eat (RTE) Snacks , 2010 .

[21]  A. Kaya,et al.  EXPERIMENTAL INVESTIGATION OF DRYING KINETICS OF CHERRY LAUREL , 2008 .

[22]  W. Jomaa,et al.  Moisture diffusivity and drying kinetic equation of convective drying of grapes , 2002 .

[23]  Carmen Rosselló,et al.  Use of exponential, Page's and diffusional models to simulate the drying kinetics of kiwi fruit , 2004 .

[24]  Hasan Toǧrul,et al.  Moisture Sorption Isotherms for Crushed Chillies , 2005 .

[25]  B. A. Souraki,et al.  DRYING BEHAVIOR OF FRESH GREEN BEANS IN AN INERT MEDIUM FLUIDIZED BED , 2008 .

[26]  D. R. Pangavhane,et al.  DRYING KINETIC STUDIES ON SINGLE LAYER THOMPSON SEEDLESS GRAPES UNDER CONTROLLED HEATED AIR CONDITIONS , 2000 .

[27]  F. Kaymak-Ertekin,et al.  Sorption isotherms and isosteric heat of sorption for grapes, apricots, apples and potatoes , 2004 .

[28]  G. Crapiste,et al.  Drying kinetics and quality changes during drying of red pepper , 2008 .

[29]  Thodoris D. Karapantsios,et al.  Water sorption isotherms and glass transition temperature of spray dried tomato pulp , 2008 .

[30]  E. Akpinar,et al.  Thin layer drying of red pepper , 2003 .

[31]  M. Schreiner,et al.  Postharvest quality of pepino (Solanum muricatum Ait.) fruit in controlled atmosphere storage , 2006 .

[32]  Chung Lim Law,et al.  Modeling using a new thin layer drying model and product quality of cocoa , 2009 .

[33]  M. Miranda,et al.  Hot-air drying characteristics of Aloe vera (Aloe barbadensis Miller) and influence of temperature on kinetic parameters , 2007 .

[34]  D. Valero,et al.  Physiological changes in pepino (Solanum muricatum Ait.) fruit stored at chilling and non-chilling temperatures , 2003 .

[35]  V. Telis,et al.  Ascorbic acid degradation kinetics in tomatoes at different drying conditions , 2008 .

[36]  C. Chen,et al.  PH—Pastharvest Technology: Sorption Isotherms of Sweet Potato Slices , 2002 .

[37]  C. Akanbi,et al.  Drying characteristics and sorption isotherm of tomato slices , 2006 .

[38]  Nelson Bracho,et al.  Weibull distribution for modeling air drying of coroba slices , 2008 .

[39]  Mehmet Pala,et al.  Drying characteristics of dill and parsley leaves , 2006 .

[40]  N. Sanjuán,et al.  Morchella esculenta (morel) rehydration process modelling , 2006 .