The Improvement of Crocin Stability in Rock Candy (Nabat) By Microencapsulation

Document Type : Research Paper


1 Department of Food Science and Technology, Islamic Azad University, Sabzevar, Iran

2 Department of Food Additives, Food Science and Technology Research Institute (ACECR), Khorasan Razavi, Iran

3 Department of Food Science and Technology, Ferdowsi University of Mashhad (FUM), Mashhad, Iran


In the present study, the microencapsulation technique was utilized to improve the stability of crocin in Nabat (rock candy), which is a popular confection in Iran. For this purpose, crocin was extracted from saffron, and its microcapsules were prepared through the spray drying process. Gelatin solutions with various concentrations (3%, 5%, 7%, and 10% w/v) were used as the wall material. The encapsulated crocin was added to Nabat, and the physicochemical and organoleptic properties of the samples were compared to Nabat containing pure crocin in different storage conditions. The obtained results indicated that increasing the concentration of the wall materials from 3% to 10% significantly increased the particle size of the microcapsules. The optimal efficiency of crocin microencapsulation was observed at the gelatin concentration of 5%. In addition, a significant difference was observed in the color properties of Nabat containing pure and encapsulated crocin during storage. Therefore, crocin microencapsulation could preserve the sensory properties of the samples. Considering the significant effect of light on the stability of crocin, Nabat containing this substance should be protected from direct light by hermetic packaging.


  1. Godshall MA. Candies and Sweets: Sugar and Chocolate Confectionery. Encyclopedia of Food and Health, 1st ed. Elsevier; 2016.
  2. Diacu E. Colors: Properties and Determination of Synthetic Pigments. Encyclopedia of Food and Health, 1st ed. Elsevier; 2016.
  3. Mortensen A. Carotenoids and other pigments as natural Colorants. Pure Appl. Chem 2006; 78:1477–1491.
  4. Pathan SA, Alam S, Jain GK, Zaidi SMA, Akhter S, Vohora D, et al. Quantitative analysis of safranal in saffron extract and nanoparticle formulation by a validated high-performance thin-layer chromatographic method. Phytochem Anal 2010; 21:219-223.
  5. Selim K, Tsimidou M, Biliaderis CG. Kinetic studies of degradation of saffron carotenoids encapsulated amorphous polymer matrices. Food Chem 2000; 71: 199-206.
  6. Desai KGH, Park HJ. Recent developments in microencapsulation of food ingredients. Dry. Technol 2005; 23:1361–1394.
  7. Ersus S, Yudagel U. Microencapsulation of anthocyanin pigments of black carrot (Daucuscarota L.) by spray drier.  J. Food Eng 2007; 80:805–812.
  8. Righetto AM, Netto FM. Effect of encapsulation materials on water sorption, glass transition, and stability of juice from immature acerole. Int. J. Food Prop 2005; 8: 337-346.
  9. Maa Y, Nguyen P, Sit K, Hsu C.C. Spray-drying performance of a bench-top spray dryer for protein aerosol powder preparation. Biotechnol 1998; 60: 301−309.
  10. Wang Y, Zhaoxin L, Fengxia L, Xiaomei B. Study on microencapsulation of curcumin pigments by spray drying. Eur. Food Res. Technol 2009; 229: 391–396.
  11. Porrarud S, Pranee A. Microencapsulation of Zn-chlorophyll pigment from Pandan leaf by spray drying and it's characteristic. Int. Food Res. J 2010; 17:1031-1042.
  12. Bo Sh, Wenli Y, Yaping Z, Xiaoyong L. Study on microencapsulation of lycopene by spray drying. J. Food Eng 2006; 76:664–669.
  13. Robert P, Carlsson RM, Romero N, Masson L. Stability of spray-dried encapsulated carotenoid pigments from rosa mosqueta (Rosa rubiginosa) oleoresin. J. Am. Oil Chem. Soc 2003; 80: 1115–1120.
  14. Najaf Najafi M, Kadkhodaee R, Mortazavi SA. Effect of drying process and wall material on the properties of encapsulated cardamom oil. Food Biophys 2011; 6: 68-76.
  15. Iranian National Standards organization: INSO1196: Spices and condiments-Determination of moisture content-Entrainment method. 1st. Revision; 2012.
  16. Yu H, Huang Q. Enhanced in vitro anti-cancer activity of curcumin encapsulated in hydrophobically modified starch. Food Chem 2009; 119: 669-674.
  17. Rodriguez SD, Wilderjans TF, Sosa N, Bernik DL. Image texture analysis and gas sensor array studies applied to vanilla encapsulation by Octenyl Succinic anhydride starches. J. Food Res 2013; 2: 36.
  18. Iranian National Standards organization: INSO711: Toffee and candy Specifications and test methods. 4st. Revision; 2020.
  19. Taherian AR, Fustier P, Ramaswamy HS. Effect of added oil and modified starch on rheological properties, droplet size distribution, opacity and stability of beverage cloud emulsions. J. Food Eng 2006; 77: 687-696.
  20. Wang Y, Li D, Wang L, Adhikari B. The effect of addition of flaxseed gum on the emulsion properties of soybean protein isolate (SPI). J. Food Eng 2011; 104: 56-62.
  21. Liu XD, Atarashi T, Furuta T, Yoshii H, Aishima S, Ohkawara M. Microencapsulation of emulsified hydrophobic flavors by spray drying. DRY TECHNOL 2001; 19:1361–1374.
  22. Mourtzinos I, Salta F, Yannakopoulou K, Chiou A, Karathanos V. Encapsulation of Olive Leaf extract in β-Cyclodextrin. J. Agric. Food Chem 2007; 55:8088-8094.
  23. Burey P, Bhandari BR, Howes T, Gidley MJ. Hydrocolloid gel particles: formation, characterization, and application. Crit Rev Food Sci Nutr 2008; 48:361-377.
  24. Gomez-Diaz D, Navaza JM. Rheology of aqueous solutions of food additives: Effect of concentration, temperature and blending.  J. Food Eng 2003; 56:387–392.
  • Receive Date: 06 August 2020
  • Revise Date: 21 November 2020
  • Accept Date: 22 November 2020
  • First Publish Date: 22 November 2020