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Optimization of microwave and infrared drying process of nettle leaves using design of experiments

  • Kamyar Movagharnejad
  • Fateme Vahdatkhoram
  • Sara Nanvakenari
Article

Abstract

Optimization of microwave and infrared drying processes of nettle leaves was investigated using dependent variables of drying time and phenolic composition of nettle extracts. The response surface method was selected for design and optimization of the processes. Experiments were performed at different microwave power levels (180, 360, 540, 720 and 900 W) and infrared lamp distances to samples (4, 5.5, 7, 8.5 and 10 cm). The results showed that the drying time (t) decreased and the amount of total phenolic contents (TPC) of nettle extracts increased with an increase in microwave power and also increasing infrared lamp distance to the sample increased the drying time of the samples and decreased the amount of total phenolic contents of nettle extracts. Based on response surface and desirability functions, the optimum conditions for nettle leaves drying were: microwave power 900 W and infrared lamp distance 4 cm. At this point, t and TPC were obtained as 3.014 min and 38.81 mg/g for microwave dryer and 7.73 min and 36.45 mg/g for infrared dryer, respectively.

Keywords

Microwave Infrared Drying Nettle RSM TPC 

References

  1. 1.
    Kavalalı G, Tuncel H, Göksel S, Hatemi H. Hypoglycemic activity of Urtica pilulifera in streptozotocin-diabetic rats. J Ethnopharmacol. 2003;84(2):241–5.CrossRefGoogle Scholar
  2. 2.
    Önal S, Timur S, Okutucu B, Zihnioğlu F. Inhibition of α-glucosidase by aqueous extracts of some potent antidiabetic medicinal herbs. Prep Biochem Biotechnol. 2005;35(1):29–36.CrossRefGoogle Scholar
  3. 3.
    Hojnik M, Škerget M, Knez Ž. Isolation of chlorophylls from stinging nettle (Urtica dioica L.). Sep Purif Technol. 2007;57(1):37–46.CrossRefGoogle Scholar
  4. 4.
    Noguchi N, Niki E. Phenolic antioxidants: a rationale for design and evaluation of novel antioxidant drug for atherosclerosis. Free Radic Biol Med. 2000;28(10):1538–46.CrossRefGoogle Scholar
  5. 5.
    Bzducha A, Wołosiak R. Synergistic effect of antioxidant activity of casein and its enzymatic hydrolysate in combination with ascorbic acid and β-carotene in model oxidation systems. Acta Sci Pol Technol Aliment. 2006;5(1):113–33.Google Scholar
  6. 6.
    Maskan M. Drying, shrinkage and rehydration characteristics of kiwifruits during hot air and microwave drying. J Food Eng. 2001;48(2):177–82.CrossRefGoogle Scholar
  7. 7.
    Alibas I. Energy consumption and colour characteristics of nettle leaves during microwave, vacuum and convective drying. Biosys Eng. 2007;96(4):495–502.CrossRefGoogle Scholar
  8. 8.
    Therdthai N, Zhou W. Characterization of microwave vacuum drying and hot air drying of mint leaves (Mentha cordifolia Opiz ex Fresen). J Food Eng. 2009;91(3):482–9.CrossRefGoogle Scholar
  9. 9.
    Sarimeseli A. Microwave drying characteristics of coriander (Coriandrum sativum L.) leaves. Energy Convers Manag. 2011;52(2):1449–53.CrossRefGoogle Scholar
  10. 10.
    Krishnamurthy K, Khurana HK, Soojin J, Irudayaraj J, Demirci A. Infrared heating in food processing: an overview. Compr. Rev. Food Sci. Food Saf. 2008;7(1):2–13.CrossRefGoogle Scholar
  11. 11.
    Hamanaka D, Dokan S, Yasunaga E, Kuroki S, Uchino T, Akimoto K. The sterilization effects of infrared ray on the agricultural products spoilage microorganisms. 2000:1–9.Google Scholar
  12. 12.
    Boudhrioua N, Bahloul N, Slimen IB, Kechaou N. Comparison on the total phenol contents and the color of fresh and infrared dried olive leaves. Ind Crops Prod. 2009;29(2–3):412–9.CrossRefGoogle Scholar
  13. 13.
    Torki-Harchegani M, Ghanbarian D, Maghsoodi V, Moheb A. Infrared thin layer drying of saffron (Crocus sativus L.) stigmas: mass transfer parameters and quality assessment. Chin J Chem Eng. 2017;25(4):426–32.CrossRefGoogle Scholar
  14. 14.
    Afzal T, Abe T, Hikida Y. Energy and quality aspects during combined FIR-convection drying of barley. J Food Eng. 1999;42(4):177–82.CrossRefGoogle Scholar
  15. 15.
    Hinkelmann K. Design and analysis of experiments, volume 3: special designs and applications. New York: Wiley; 2011.Google Scholar
  16. 16.
    Omolola AO, Jideani AIO, Kapila PF, Jideani VA. Optimization of microwave drying conditions of two banana varieties using response surface methodology. Food Sci Technol. 2015;35(3):438–44.CrossRefGoogle Scholar
  17. 17.
    Šumić Z, Vakula A, Tepić A, Čakarević J, Vitas J, Pavlić B. Modeling and optimization of red currants vacuum drying process by response surface methodology (RSM). Food Chem. 2016;203:465–75.CrossRefGoogle Scholar
  18. 18.
    Patil V, Chauhan AK, Singh RP. Optimization of the spray-drying process for developing guava powder using response surface methodology. Powder Technol. 2014;253:230–6.CrossRefGoogle Scholar
  19. 19.
    Schultz R, Cole R, editors. Uncertainty analysis in boiling nucleation. AIChE symposium series; 1979.Google Scholar
  20. 20.
    Singleton V, Rossi JA. Colorimetry of total phenolics with phosphomolybdic-phosphotungstic acid reagents. Am J Enol Vitic. 1965;16(3):144–58.Google Scholar
  21. 21.
    Zarein M, Samadi SH, Ghobadian B. Investigation of microwave dryer effect on energy efficiency during drying of apple slices. J Saudi Soc Agric Sci. 2015;14(1):41–7.Google Scholar
  22. 22.
    Çağlar A, Toğrul İT, Toğrul H. Moisture and thermal diffusivity of seedless grape under infrared drying. Food Bioprod Process. 2009;87(4):292–300.CrossRefGoogle Scholar
  23. 23.
    Alibas I. Drying of thin layer mango slices with microwave technique. Anadolu Tarim Bilimleri Dergisi. 2015;30(2):99.CrossRefGoogle Scholar
  24. 24.
    Tirawanichakul Y, Kaseng S, Tirawanichakul S. Infrared and hot air drying of mullet fish: drying kinetics, qualities and energy consumption. Thai J Agric Sci. 2011;44(5):384–90.Google Scholar
  25. 25.
    Ponkham K, Meeso N, Soponronnarit S, Siriamornpun S. Modeling of combined far-infrared radiation and air drying of a ring shaped-pineapple with/without shrinkage. Food Bioprod Process. 2012;90(2):155–64.CrossRefGoogle Scholar
  26. 26.
    Darvishi H, Azadbakht M, Rezaeiasl A, Farhang A. Drying characteristics of sardine fish dried with microwave heating. J Saudi Soc Agric Sci. 2013;12(2):121–7.Google Scholar
  27. 27.
    Wojdyło A, Figiel A, Lech K, Nowicka P, Oszmiański J. Effect of convective and vacuum–microwave drying on the bioactive compounds, color, and antioxidant capacity of sour cherries. Food Bioprocess Technol. 2014;7(3):829–41.CrossRefGoogle Scholar
  28. 28.
    Kubra IR, Jagan Mohan Rao L. Microwave drying of ginger (Zingiber officinaleRoscoe) and its effects on polyphenolic content and antioxidant activity. Int J Food Sci Technol. 2012;47(11):2311–7.CrossRefGoogle Scholar
  29. 29.
    Chan E, Lim Y, Wong S, Lim K, Tan S, Lianto F, et al. Effects of different drying methods on the antioxidant properties of leaves and tea of ginger species. Food Chem. 2009;113(1):166–72.CrossRefGoogle Scholar
  30. 30.
    Doymaz İ, Karasu S, Baslar M. Effects of infrared heating on drying kinetics, antioxidant activity, phenolic content, and color of jujube fruit. J Food Meas Charact. 2016;10(2):283–91.CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Faculty of Chemical EngineeringBabol Noshiravani University of TechnologyBabolIran

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