Abstract

With the introduction of cold storage in date palm cultivation areas, cold storage has been gaining popularity as it allows for dates consumption at any time of the year. In this study, the quality of two date cultivars, 'Khalas' and 'Sukkary', commonly grown in Saudi Arabia, were studied under cold storage. The chosen storage conditions were 12 months at 5°C. Data of fruit quality were collected at harvest, after 3, 6, 9 and 12 months, respectively of storage. Physicochemical characteristics of stored date fruits, such as moisture, Total Soluble Solids (TSS), tannins, pH, water activity, firmness, color, fruit weight, length and width, were measured. The results showed that cold storage and packing type could significantly affect physical and chemical quality of date fruits. Significant differences in fruit length, width and date seed width, were observed. Physical attributes such as fruit weight, length, width and date seed length, were significantly reduced due to storage period. Firmness of date fruits increased with the increase of storage time. There was significant effect of package type on TSS and water activity of Sukkary date. However, packing type had no significant effect on chemical characteristics for Khalas date. Storage time significantly affected moisture content and pH of date fruits. Water activity and pH of date fruits decreased during storage period. Packing type significantly affected color properties of Sukkary date compared with Khalas. Lightness, redness and yellowness showed significant differences during storage period. Lightness and yellowness increased significantly during storage time, while redness decreased significantly at same conditions. Cold storage is capable of being a viable alternative that allows for long term storage of date fruits.

Keywords:

Cold storage, date, date quality, physicochemical characteristics,

References

1. Abu-Goukh, A.A., A.E. Shattir and M.M.E. Balla, 2003. Effect of harvesting method on quality and storability of dry dates in Sudan. Trop. Sci., 43: 53-56.
   CrossRef    
2. Afoakwa, E.O. and S. Sefa-Dedeh, 2001. Chemical composition and quality changes occurring in Dioscorea dumetorum pax tubers after harvest. Food Chem., 75: 85-91.
   CrossRef    
3. Aleid, S.M., 2013. Dates Processing and Processed Products. In: Siddiq, M., S.M. Al-Eid and A.A. Kader (Eds.), Dates: Postharvest Science, Processing Technology and Health Benefits. John-Wiley Publishing Co., Ames, Iowa, USA, pp: 171-202.
   CrossRef    
4. Aleid, S.M. and I.S. Dogan, 2004. Sensory evaluation of double layered arabic bread using quantitative descriptive analysis. Univ., Khartoum J. Agr. Sci., 12: 65-77.
   
5. Aleid, S.M., A.R. Barber, M. Rettke, N. Leo, W.A. Alsenaien and A.A. Sallam, 2012. Utilization of modified atmosphere packaging to extend the shelf Life of Khalas fresh dates. Int. J. Food Sci. Tech., 47: 1518-1525.
   CrossRef    
6. Al-Farsi, M.A. and C.Y. Lee, 2008. Nutritional and functional properties of dates: A review. Crit. Rev. Food Sci. Nutr., 48: 877-887.
   CrossRef    PMid:18949591    Direct Link
7. Al-Kahtani, H.A., H.M. Abu-Tarboush, Y.N. Al-Dryhim, M.A. Ahmed, A.S. Bajaber, E.A. El-Shami and M.A. El-Mojaddidi, 1998. Irradiation of dates: Insect disinfestations, microbial and chemical assessments and use of thermoluminescence. Radiat. Phys. Chem., 53: 181-187.
   CrossRef    
8. Al-Ogaidi, H.K. and H.H. Mutlak, 1986. The phenolic compounds of four date cultivars during maturity stages. Date Palm J., 4: 191-196.
   
9. Al-Redhaiman, K.N., 2005. Chemical changes during storage of 'Barhi' dates under controlled atmosphere conditions. Hortscience, 40: 1413-1415.
   
10. Al-Yahayai, R. and L. Al-Kharusi, 2012. Physical and chemical quality attributes of freeze-stored dates. Int. J. Agr. Biol., 14: 97-100.
    
11. AOAC, 1992. Official Methods of Analysis. 15th Edn., Association of Official Analytical Chemists, Washington, D.C.
    
12. AOAC, 1995. Official Methods of Analysis. 16th Edn., Association of Official Analytical Chemists, Washington, D.C.
    
13. Ashraf, Z. and Z. Hamidi-Esfahani, 2011. Date and date processing: A review. Food Rev. Int., 27: 101-133.
    CrossRef    
14. Azelmat, K., F. Sayah, M. Mouhib, N. Ghailani and D. El-Garrouj, 2005. Effect of gamma irradiation on fourth-instar Plodia interpunctella (Hubner) (Lepidoptera: Pyralidae). J. Stored Prod. Res., 41: 423-431.
    CrossRef    
15. Baloch, M.K., S.A. Saleem, A.K. Baloch and W.A. Baloch, 2006. Impact of controlled atmosphere on the stability of Dhakki dates. LWT-Food Sci. Technol., 39: 671-676.
    
16. Besbes, S., C. Blecker, C. Deroanne, N. Drira and H. Attia, 2004. Date seed: Chemical composition and characteristic profiles of the lipid fraction. J. Food Chem., 84: 577-584.
    CrossRef    
17. Din, Z.U., H.U. Shah, Ihsanullah, A. Zubari and S.A. Khan, 2011. Estimation of physico-chemicals and microbiological levels during storage of irradiated fresh date sample. Int. J. Sci. Nat., 2: 16-21.
    
18. Fernandez-Lopez, J., 1998. Estudio del color por metodos objetivos en sistemas modelo de pastas de embutidos crudo-curados. Ph.D. Thesis, Universidad de Murcia, Spain.
    
19. Fernandez-Lopez, J., A. Yelo, E. Sendra, E. Sayas-Barbera, C. Navarro and J.A. Perez-Alvarez, 2006. Shelf-life of ostrich liver stored under different packaging conditions. J. Food Protect., 54: 58-70.
    
20. Fernandez-Lopez, J., E. Sayas-Barbera, T. Munoz, E. Sendra, C. Navarro and J.A. Perez-Alvarez, 2008. Effect of packaging conditions on shelf-life of ostrich steaks. Meat Sci., 78: 143-152.
    CrossRef    PMid:22062104    
21. Harker, F.R., F. Gunson and S.R. Jaeger, 2003. The case of fruit quality: An interpretive review of consumer attitudes and preferences for apples. Postharvest Biol. Tec., 28: 333-347.
    CrossRef    
22. Ihsanullah, I., Y. Iqbal and T.N. Khattak, 2005. Effect of various irradiation doses on some nutrients of Pakistani date. J. Radioanal. Nucl. Ch., 266: 361-366.
    CrossRef    
23. Ismail, B., I. Haffar, R. Baalbaki and J. Henry, 2008. Physico-chemical characteristics and sensory quality of two date varieties under commercial and industrial storage conditions. LWT-Food Sci. Technol., 41: 896-914.
    
24. Khan, R.U., A. Rashid, M.S. Khan and M.A. Farooq, 2008. Evaluation of date palm cultivars with their monetary returns under ecological zone of dera Ismail Khan. J. Agric. Res., 46: 93-98.
    
25. Kusmider, E.A., J.G. Sebranek, S.M. Lonergan and M.S. Honeyman, 2002. Effects of carbon monoxide packaging on color and lipid stability of irradiated ground beef. J. Food Sci., 67: 3463-3468.
    CrossRef    
26. Lee, J.W., J.K. Kim, P. Srinivasan, J. Choi, J.H. Kim, S.B. Han, D.J. Kim and M.W. Byun, 2008. Effect of gamma irradiation on microbial analysis, antioxidant activity, sugar content and color of ready-to-use tamarind juice during storage. LWT-Food Sci. Technol., 42: 101-105.
    
27. Markkar, H.P.S., M. Bluemme, N.K. Borowy and K. Becker, 1993. Gravimetric determination of tannins and their correlations with chemical and protein precipitation methods. J. Sci. Food Agr., 61: 161-165.
    CrossRef    
28. Mutlak, H.H. and J. Mann, 1984. Darkening of dates: Control by microwave heating. Date Palm J., 3: 303-316.
    
29. Omoigho, S.E. and M.J. Ikenebomeh, 2000. Effect of temperature treatment on the chemical composition of pounded white yam during storage. Food Chem., 71: 215-220.
    CrossRef    
30. Perez-Alvarez, J.A., E. Sayas-Barbera, J. Fernandez-Lopez and V. Aranda-Catala, 1999. Physicochemical characteristics of Spanish-type dry-cured sausage. Food Res. Int., 32: 599-607.
    CrossRef    
31. Sahari, M.A., M. Barzegar and R. Radfar, 2007. Effect of varieties on the composition of dates (Phoenix dactylifera L.). Food Sci. Technol. Int., 13: 269-275.
    CrossRef    
32. Sanchez-Zapata, E., E. Fuentes-Zaragoza, C. Navarro-Rodriguez de Vera, E. Sayas, E. Sendra, J. Fernandez-Lopez and J.A. Perez-Alvarez, 2011. Effects of tuna pate thickness and background on CIEL*a*b* color parameters and reflectance spectra. Food Control, 22: 1226-1232.
    CrossRef    
33. Tang, Z.X., L.E. Shi and S.M. Aleid, 2013. Date fruit: Chemical composition, nutritional and medicinal values, products. J. Sci. Food Agr., 93: 2351-2361.
    CrossRef    PMid:23553505    
34. Wills, R., B. McGlasson, D. Graham and D. Joyce, 1998. Post Harvest: An Introduction to the Physiology and Handing of Fruits, Vegetables and Ornamentals. 4th Edn., University of New South Wales Press Ltd., Australia.
    
35. Zare, Z., M. Sohrabpour, T.Z. Fazeli and K.G. Kohan, 2002. Evaluation of invertase (β-frutofuranosidase) activity in irradiated Mazafaty dates during storage. Radiat. Phys. Chem., 65: 289-291.
    CrossRef    

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