Plant Foods for Human Nutrition

, Volume 74, Issue 2, pp 171–178 | Cite as

Effect of Different Drying Methods on the Physicochemical Properties and Bioactive Components of Saffron Powder

  • Zahra Aghaei
  • Seid Mahdi JafariEmail author
  • Danial Dehnad
Original Paper


Saffron is the most expensive spice in the world; so, determining optimum conditions for its processing is crucial. The most important processing stage of saffron is drying of its stigma, which should be optimized and there are no reports on reactance-window (RW) of saffron. In this research, drying of saffron with traditional, RW, and oven driers and at three temperatures of 60, 70 and 80 °C, as well as room temperature (25 °C) were studied. Regarding process duration, RW drier with 200 μm Mylar membrane and oven drier were the best methods with average drying time of 25.28 and 22.28 min, respectively. As far as the concentration of bioactive ingredients, i.e., picrocrocin, safranal, and crocin, of saffron was concerned, RW drier with Pyrex glass was better than other driers, resulting in 112.83 \( {E}_{257 nm}^{1\%} \) of picrocrocin, 51.79 \( {E}_{330 nm}^{1\%} \) of safranal, and 274.76 \( {E}_{440 nm}^{1\%} \) of crocin. The panelist most favored those saffron samples dried by RW with 300 μm Mylar membrane.


Saffron powder Bioactive ingredients Refractance-window drying Organoleptic properties 


Compliance with Ethical Standards

Conflict of Interest

Zahra Aghaei has no conflict of interest.

Seid Mahdi Jafari has no conflict of interest.

Danial Dehnad has no conflict of interest.

Ethical Standards

This article does not contain any studies with human or animal subjects.


  1. 1.
    Sarfarazi M, Jafari SM, Rajabzadeh G (2015) Extraction optimization of saffron nutraceuticals through response surface methodology. Food Anal Methods 8(9):2273–2285Google Scholar
  2. 2.
    Faridi Esfanjani A, Jafari SM, Assadpour E (2017) Preparation of a multiple emulsion based on pectin-whey protein complex for encapsulation of saffron extract nanodroplets. Food Chem 221:1962–1969Google Scholar
  3. 3.
    Noorbala AA, Akhondzadeh S, Tahmacebi-Pour N, Jamshidi AH (2005) Hydro-alcoholic extract of Crocus sativus L. versus fluoxetine in the treatment of mild to moderate depression: a double-blind, randomized pilot trial. J Ethnopharmacol 97(2):281–284Google Scholar
  4. 4.
    Shahi T, Assadpour E, Jafari SM (2016) Main chemical compounds and pharmacological activities of stigmas and tepals of ‘red gold’; saffron. Trends Food Sci Technol 58:69–78Google Scholar
  5. 5.
    Samarghandian S, Borji A (2014) Anticarcinogenic effect of saffron (Crocus sativus L.) and its ingredients. Pharm Res 6(2):99–107Google Scholar
  6. 6.
    Iran’s National Standard (2012) Saffron-test methods, ISIRI NUMBER: 259–2. 5th Rev. Iranian National Standardization OrganizationGoogle Scholar
  7. 7.
    Aghaei Z, Jafari SM, Dehnad D, Ghorbani M, Hemmati K (2018) Refractance-window as an innovative approach for the drying of saffron petals and stigma. J Food Process Eng 41(7):e12863Google Scholar
  8. 8.
    Carmona M, Zalacain A, Pardo JE, Lopez E, Alvarruiz A, Alonso GL (2005) Influence of different drying and aging conditions on saffron constituents. J Agric Food Chem 53(10):3974–3979Google Scholar
  9. 9.
    Rostami H, Dehnad D, Jafari SM, Tavakoli HR (2017) Evaluation of physical, rheological, microbial, and organoleptic properties of meat powder produced by fefractance window drying. Dry Technol 36:1076–1085Google Scholar
  10. 10.
    Nindo CI, Tang J (2007) Refractance window dehydration technology: a novel contact drying method. Dry Technol 25(1):37–48Google Scholar
  11. 11.
    Abul-Fadl MM, Ghanem TH (2011) Effect of refractance-window (RW) drying method on quality criteria of produced tomato powder as compared to convection drying method. World Appl Sci J 15(7):953–963Google Scholar
  12. 12.
    Jafari S-M, Azizi D, Mirzaei H, Dehnad D (2016) Comparing quality characteristics of oven-dried and refractance window-dried kiwifruits. J Food Process Preserv 40(3):362–372Google Scholar
  13. 13.
    Azizi D, Jafari Seid M, Mirzaei H, Dehnad D (2016) The influence of refractance window drying on qualitative properties of kiwifruit slices. Int J Food Eng 13(2):1–14Google Scholar
  14. 14.
    Maghsoodi V, Kazemi A, Akhondi E (2012) Effect of different drying methods on saffron (Crocus sativus L.) quality. Iran J Chem Eng 3(2):85–89Google Scholar
  15. 15.
    Atefi M, Akbari Oghaz A, Mehri A (2013) Drying effects on chemical and sensorial characteristics of saffron. Iran J Nutr Sci Food Technol 8(3):201–208Google Scholar
  16. 16.
    Bolandi M, Ghoddusi HB (2006) Flavour and colour changes during processing and storage of saffron (Crocus sativus L.). In: Wender LPB, Mikael Agerlin P (eds) Developments in food science. Elsevier, Amsterdam, pp 323–326Google Scholar
  17. 17.
    Iran’s National Standard (1974) Spices and condiments determination of moisture, ISIRI no: 1196. 1st edn. Institute of Standards and Industrial Research of IranGoogle Scholar
  18. 18.
    Iran’s National Standard (2009) Spices and condiments saffron-determination of cold water soluble extract, ISIRI no: 12185. 1st edn. Institute of Standards and Industrial Research of IranGoogle Scholar
  19. 19.
    Iran’s National Standard (1996) Determination of moisture in dried fruit, ISIRI no: 672. 5th edn. Institute of Standards and Industrial Research of IranGoogle Scholar
  20. 20.
    Hosseini A, Jafari SM, Mirzaei H, Asghari A, Akhavan S (2015) Application of image processing to assess emulsion stability and emulsification properties of arabic gum. Carbohydr Polym 126:1–8Google Scholar
  21. 21.
    Ortiz-Jerez MJ, Gulati T, Datta AK, Ochoa-Martínez CI (2015) Quantitative understanding of refractance window™ drying. Food Bioprod Process 95:237–253Google Scholar
  22. 22.
    Raina BL, Agarwal SG, Bhatia AK, Gaur GS (1996) Changes in pigments and volatiles of saffron (Crocus sativus L.) during processing and storage. J Sci Food Agric 71(1):27–32Google Scholar
  23. 23.
    Vega-Gálvez A, Zura-Bravo L, Lemus-Mondaca R, Martinez-Monzó J, Quispe-Fuentes I, Puente L, Di Scala K (2015) Influence of drying temperature on dietary fibre, rehydration properties, texture and microstructure of cape gooseberry (Physalis peruviana L.). J Food Sci Technol 52:2304–2311Google Scholar
  24. 24.
    Krokida MK, Marinos-Kouris D (2003) Rehydration kinetics of dehydrated products. J Food Eng 57:1–7Google Scholar
  25. 25.
    Iborra J, Castellar M, Cánovas M, Manjón A (1992) Picrocrocin hydrolysis by immobilized β-glucosidase. Biotechnol Lett 14(6):475–480Google Scholar
  26. 26.
    Iborra J, Castellar M, Cánovas M, Manjón A (1993) Analysis of a packed-bed reactor for hydrolysis of picrocrocin by immobilized β-glucosidase. Enzym Microb Technol 15(9):780–784Google Scholar
  27. 27.
    Mortezapour H, Ghobadian B, Khoshtaghaza MH, Minaei S (2014) Drying kinetics and quality characteristics of saffron dried with a heat pump assisted hybrid photovoltaic-thermal solar dryer. J Agric Sci Technol 16(1):33–45Google Scholar
  28. 28.
    Mazloumi T, Jamshidi A, Javadi HS, phanoud K et al (2007) Comparison of the effects of vacuum oven-, freeze-, solar-, and microwave-drying with traditional drying methods on the qualitative characteristics of Ghaen saffron. Iran J Nutr Sci Food Technol 2(1):69–76Google Scholar

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Faculty of Food Science and TechnologyGorgan University of Agricultural Sciences and Natural ResourcesGorganIran

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