RESEARCH PAPER
Dielectric properties of papaya seeds from 75 kHz to 5 MHz
 
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1
State University of Northern Rio de Janeiro – UENF, Agricultural Engineering Department, Av. Alberto Lamego 2000, 28013-602 Campos dos Goytacazes, Brazil
 
2
Brazilian Federal Institute of Education, Science and Technology, 29300-970 Cachoeiro de Itapemirim, Brazil
 
3
Department of Bioscience and Biotechnology – UENF, 28013-602, Brazil
 
4
Federal University of Rio de Janeiro – UFF, Department of Agribusiness, 27255-125, Volta Redonda, Brazil
 
 
Acceptance date: 2018-12-18
 
 
Publication date: 2019-05-16
 
 
Corresponding author
Pedro A. Berbert   

caparao00@gmail.com
 
 
Int. Agrophys. 2019, 33(2): 185-192
 
KEYWORDS
TOPICS
ABSTRACT
The object of this work was to study the dielectric properties of papaya seeds of the Golden cultivar and seeds of two papaya hybrids, Tainung and Calimosa, in the frequency range from 75 kHz to 5 MHz at four levels of bulk density, and with moisture contents ranging from 6 to 23% wet basis. The relative permittivity and the loss factor of the seeds were measured using a precision LCR meter, and their relationship with the variable frequency of the oscillating electric field, the seed moisture content and bulk density, and the cultivar/hybrid type were established. Relative permittivity for each value of the moisture content was reduced regularly as the frequency increased. Abrupt changes in the slopes of the curves demonstrating the relationship between the relative permittivity and the loss factor, and the moisture content were considered an indication of changes in the water sorption mechanisms occurring within the seed. The relationship between the relative permittivity and the loss factor, and bulk density was represented by linear functions with positive slopes. The effect of the cultivar or hybrid types on the relative permittivity and the loss factor revealed that seeds of the Golden cultivar and the Tainung hybrid exhibited similar relative permittivity values in the whole frequency range studied, in contrast to seeds of the Calimosa hybrid.
ACKNOWLEDGEMENTS
Thanks are due to Caliman Agrícola S.A. which provided all the fruit lots used in this experiment. We would like to acknowledge the contribution of Mr Pedro Henrique Dias for the collection of fruits.
 
REFERENCES (36)
1.
Berbert P.A. and Stenning B.C., 1996. Analysis of density-independent equations for determination of moisture content of wheat in the radiofrequency range. J. Agric. Eng. Res., 65(4), 275-286. https://doi.org/10.1006/jaer.1....
 
2.
Berbert P.A., Queiroz D.M., Sousa E.F., Molina M.A.B., and Melo E.C., 2001. Dielectric properties of parchment coffee. J. Agric. Eng. Res., 80(1), 65-80.
 
3.
Berbert P.A., Queiroz D.M., and Melo E.C., 2002. Dielectric properties of common bean. Biosystems Eng., 83(4), 449-462.
 
4.
Blythe T. and Bloor D., 2005. Electrical Properties of Polymers – Cambridge Solid State Science Series. Cambridge: Cambridge University Press.
 
5.
Boldor D., Sanders T.H., and Simunovic J., 2004. Dielectric properties of in-shell and shelled peanuts at microwave frequencies. Trans. ASAE, 47(4), 1159-1169. https://doi.org/10.13031/2013.....
 
6.
Brasil, 2009. Rules for Seed Testing (in Portuguese). Brazil: Ministry of Agriculture, Livestock and Food Supply – MAPA/ACS.
 
7.
Bron I.U. and Jacomino A.P., 2006. Ripening and quality of ‘Golden’ papaya fruit harvested at different maturity stages. Braz. J. Plant Physiol., 18(3), 389-396. https://doi.org/10.1590/s1677-....
 
8.
Carlesso V.O., 2009. Drying and storage of papaya (Carica papaya L.) seeds (in Portuguese). Campos dos Goytacazes, Brazil: UENF.
 
9.
Carvalho F.A. and Renner S.S., 2012. A dated phylogeny of the papaya family (Caricaceae) reveals the crop’s closest relatives and the family’s biogeographic history. Mol. Phylogenet. Evol., 65(1), 46-53. https://doi.org/10.1016/j.ympe....
 
10.
CEAGESP São Paulo State Warehouse Company for Agricultural Products, 2015. Division of Quality Management of Horticultural Produce – SECQH (in Portuguese). http://www.ceagesp.gov.br/wp-c...; https://doi.org/10.18411/d-201....
 
11.
Cseresnyés I., Rajkai K., and Vozáry E., 2013. Role of phase angle measurement in electrical impedance spectroscopy. Int. Agrophys., 27(4), 377-383. https://doi.org/10.2478/intag-....
 
12.
Digman M.F., Conley S.P., and Lauer J.G., 2012. Evaluation of a microwave resonator for predicting grain moisture independent of bulk density. Applied Eng. Agric., 28(4), 611-617. https://doi.org/10.13031/2013.....
 
13.
Ellis R.H., Hong T.D., and Roberts E.H., 1985. Handbook of Seed Technology for Genebanks: Compendium of Specific Germination Information and Test Recommendations. Rome: International Board for Plant Genetic Resources.
 
14.
Ellis R.H., Hong T.D., and Roberts E.H., 1991. Effect of storage temperature and moisture on the germination of papaya seeds. Seed Sci. Res., 1(1), 69-72. https://doi.org/10.1017/s09602....
 
15.
FAO Food and Agriculture Organization of the United Nations, 2017. Food and agriculture data (FAOSTAT). http://www.fao.org/faostat/en. https://doi.org/10.1787/eb1765....
 
16.
Fuentes G. and Santamaría J.M., 2014. Papaya (Carica papaya L.): Origin, domestication, and production. In: Genetics and Genomics of Papaya, Plant Genetics and Genomics: Crops and Models. Eds R. Ming, P.H. Moore. Springer, New York, USA. https://doi.org/10.1007/978-1-....
 
17.
Funk D.B., Gillay Z., and Meszaros P., 2007. Unified moisture algorithm for improved RF dielectric grain moisture measurement. Meas. Sci. Technol., 18(4), 1004-1015. https://doi.org/10.1088/0957-0....
 
18.
ISTA International Seed Testing Association, 2010. International Rules for Seed Testing. Chapter 9: Determination of Moisture Content. Int. Seed Test. Assoc., Bassersdorf, Switzerland. https://doi.org/10.15258/istar....
 
19.
Kaatze U., 1993. Dielectric relaxation of H20/D20 mixtures. Chem. Phys. Lett., 203(1), 1-4.
 
20.
Kim M.S., Moore P.H., Zee F., Fitch M.M.M., Steiger D.L., Manshardt R.M., Paull R.E., Drew R.A., Sekioka T., and Ming R., 2002. Genetic diversity of Carica papaya as revealed by AFLP markers. Genome, 45(3), 503-512. https://doi.org/10.1139/g02-01....
 
21.
Kraszewski A.W., 1996. Microwave aquametry: Introduction to the workshop. In: Microwave Aquametry: Electromagnetic Wave Interaction with Water-Containing Materials (Ed. A.W. Kraszewski). IEEE Press, New York, USA. https://doi.org/10.1109/euma.1....
 
22.
Kraus J.D. and Carver K.R., 1984. Electromagnetics. McGraw-Hill, Inc., New York, USA.
 
23.
Kupfer K., 1996. Possibilities and limitations of density-independent moisture measurement with microwaves. In: Microwave Aquametry: Electromagnetic Wave Interaction with Water-Containing Materials (Ed. A.W. Kraszewski). IEEE Press, New York, USA.
 
24.
Lisovsky V.V., 2007. Automatic control of moisture in agricultural products by methods of microwave aquametry. Meas. Sci. Technol., 18(4), 1016-1021. https://doi.org/10.1088/.0957-....
 
25.
Łuczycka D., Czubaszek A., Fujarczuk M., and Pruski K., 2013. Dielectric properties of wheat flour mixed with oat meal. Int. Agrophys., 27(2), 175-180. https://doi.org/10.2478/v10247....
 
26.
Martins G.N., Silva R.F., Pereira M.G., Araújo E.F., and Posse S.C.P., 2006. Influence of post-harvest period of fruits on the physiological quality of papaya seeds (in Portuguese). Rev. Bras. Sementes, 28(2), 142-146.
 
27.
Moura E.E., Berbert P.A., Berbert-Molina M.A., and Oliveira M.T.R., 2013. Performance analysis of RF dielectric models for density-independent estimation of moisture content in sorghum. Powder Technol., 246, 369-378. https://doi.org/10.1016/j.powt....
 
28.
Prasad A. and Singh P.N., 2007. A new approach to predicting the complex permittivity of rice. Trans. ASABE, 50(2), 573-582. https://doi.org/10.13031/2013.....
 
29.
Sacilik K. and Colak A., 2010. Determination of dielectric pro-perties of corn seeds from 1 to 100 MHz. Powder Technol., 203, 365-370. https://doi.org/10.1016/j.powt....
 
30.
Sacilik K., Tarimci C., and Colak A., 2006. Dielectric properties of flaxseeds as affected by moisture content and bulk density in the radio frequency range. Biosys. Eng., 93(2), 153-https://doi.org/10.1016/j.bios...
 
31.
Sacilik K., Tarimci C., and Colak A., 2007. Moisture content and bulk density dependence of dielectric properties of safflower seed in the radio frequency range. J. Food Eng., 78(4),.
 
32.
Schiffmann R.F., 2014. Microwave and dielectric drying. In: Handbook of Industrial Drying (Ed. A.S. Mujumdar). CRC Press, Taylor and Francis Group, Boca Raton, USA. https://doi.org/10.1080/073739....
 
33.
Sun W.Q. and Liang Y., 2001. Discrete levels of desiccation sensitivity in various seeds as determined by the equilibrium dehydration method. Seed Sci. Res., 11(4), 317-323.
 
34.
Trabelsi S. and Nelson S.O., 2006. Nondestructive sensing of physical properties of granular materials by microwave permittivity measurement. IEEE Trans. Instrum. Meas., 55(3), 953-963. https://doi.org/10.1109/tim.20....
 
35.
Trabelsi S., Paz A.M., and Nelson S.O., 2013. Microwave dielectric method for the rapid, non-destructive determination of bulk density and moisture content of peanut hull pellets. Biosys. Eng., 115(3), 332-338. https://doi.org/10.1016/j.bios....
 
36.
Zhu X., Guo W., and Wang S., 2013. Sensing moisture content of buckwheat seed from dielectric properties. Trans. ASABE, 56(5), 1855-1862. https://doi.org/10.13031/trans...
 
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