Effects of Moisture Contents and Storage Temperatures on the Physical, Chemical and Microbiological Qualities of Non-Sulfitted Dried Apricots
Effects of Moisture Contents and Storage Temperatures on the Physical, Chemical and Microbiological Qualities of Non-Sulfitted Dried Apricots
This study was conducted to determine the changes in the physicochemical and microbiological qualities of the non-sulfited sun dried apricots (NSDAs) at three different moisture contents (MCs, 13.7, 23.5 and 27.0%) and at four different storage temperatures (4, 10, 20, and 30 °C) for 12 months in bulk and packaged samples. NSDAs were subjected to physical (moisture, water activity, pH and reflectance colour values), chemical (browning formation, β-carotene, and acidity), and microbial (counts for total aerobic mesophilic and psycrofilic bacteria, yeast and mould, xerofilic mould and yeast, osmophilic yeast, lactic acid bacteria, Enterobacteriaceae, Staphylococcus-Micrococcus spp.) analyses at one-month time intervals. Results indicated that while the fastest brown colour formation occurred in the samples containing 23.5% MC and stored at 30 °C, the browning decelerated below 10 °C. No significant change was observed in β-carotene contents of NSDAs during storage (P>0.05). After rehydration, osmophilic yeast count of NSDAs increased by 2.5 log colony-forming units (cfu/g). Significant reductions were observed in the microbial loads of the samples at 23.5 and 27.0% MCs with the decreasing water activity (P<0.05) during storage and increasing storage temperatures. However, yeast and mould counts exceeded 5.0 log cfu/g of the samples containing 27.0% MC after 2-months storage at 20 °C. Overall, we suggest that MC and storage temperature for NSDAs should be below 23.5% and 20 °C to achieve high microbial and physicochemical qualities for a year, respectively.
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- Aguilera JM, Oppermann K & Sanchez, F (1987). Kinetics of browning of sultana grapes. Journal of Food Science 52: 990–993. doi: 10.1111/j.1365-2621.1987.tb14258.x
- Alagöz S, Türkyılmaz M, Tağı Ş & Özkan M (2015). Effects of different sorbic acid and moisture levels on chemical and microbial qualities of sun-dried apricots during storage. Food Chemistry 174: 356–364. doi: 10.1016/j.foodchem.2014.11.075
- AOAC (2000). Association Official analytical Chemists. In W. Hortwitz (Ed.), AOAC Official analytical methods (17th ed.). Gaithersburg: AOAC International.
- APHA (American Public Health Association) (2002). In F. P. Downes & K. Ito (Eds.), Compendium of methods for the microbiological examination of foods (4th ed.). Washington: APHA.
- Asma BM (2007). Malatya: World’s capital of apricot culture. Chronica horticulturae 47: 20-24
- Baloch AK, Buckle KA & Edwards RA (1973). Measurement of non-enzymic browning of dehydrated carrot. Journal of the Science of Food and Agriculture 24: 389–398. doi:10.1002/jsfa.2740240406
- Barreiro JA, Milano M & Sandoval AJ (1997). Kinetics of colour change of double concentrated tomato paste during thermal treatment. Journal of Food Engineering, 33: 359–373. doi: 10.1016/S0260-8774(97)00035-6
- Beveridge T & Harrison JE (1984). Nonenzymatic browning in pear juice concentrate at elevated temperatures. Journal of Food Science 49: 1335–1336. doi: 10.1111/j.1365-2621.1984.tb14984.x
- Castañón X, Argaiz A & López–Malo A (1999). Effect of storage temperature on the microbial and colour stability of banana purée with addition of vanillin or potassium sorbate. Food Science and Technology International, 5: 51–58. doi: 10.1177%2F108201329900500105
- Chutintrasri B & Noomhorm A (2007). Colour degradation kinetics of pineapple puree during thermal processing. LWT-Food Science and Technology 40(2): 300–306. doi: 10.1016/j.lwt.2005.11.003
- Coşkun AL, Türkyılmaz M, Turfan-Aksu O, Erkan-Koç B, Yemiş O & Özkan M. (2013). Effects of various sulphuring methods and storage temperatures of the physical and chemical quality of dried apricots. Food Chemistry 141: 3670–3680. doi: 10.1016/j.foodchem.2013.06.033
- Davis EG, McBean DMcG, Rooney ML & Gipps PG 1973. Mechanisms of sulphur dioxide loss from dried fruits in flexible films. Journal of Food Technology 8: 391–405. doi: 10.1111/j.1365-2621.1973.tb01726.x
- Elmacı Y, Altuğ T & Pazır F (2008). Quality changes in unsulfured sun dried apricots during storage. International Journal of Food Properties 11: 146–157. doi:10.1080/10942910701279945
- FDA (Food and Drug Administration) (2013). Microbiological standard for processed foods http://www.fda.gov.ph/attachments/article/71149/Annex%20I%20%20FC%202013010%20Microbiological%20Standard%20for%20Processed%20Food.pdf. Acssessed 20 July 2016.
- Güleç H, Kundakçı A & Ergönül B (2009). Changes in quality attributes of intermediate-moisture raisins during storage. International Journal of Food Science and Nutrition, 60: 210–223. doi: 10.1080/09637480701663896
- Ihns R, Diamante LM, Savage GP & Vanhanen L (2011). Effect of temperature on the drying characteristics, colour, antioxidant and beta-carotene contents of two apricot varieties. International Journal of Food Science and Technology 46: 275–283. doi: 10.1111/j.1365-2621.2010.02506.x
- Jay JM (2000). Modern Food Microbiology. (2nd ed.), Aspen Publishers, Gaithersburg.
- Joubert E, Wium GL & Sadie A (2001). Effect of temperature and fruit-moisture content on discolouration of dried, sulphured Bon Chretien pears during storage. International Journal of Food Science and Technology: 36, 99–105. doi: 10.1111/j.1365-2621.2001.00412.x
- Nury FS, Taylor DH & Brekke JE (1960). Research for better quality in dried fruits. Apricots. United States Department of Agriculture, Agricultural Research Service 74–19. Albany, CA, U.S.A.
- Özkan M & Cemeroğlu B (2002). Desulfiting dried apricots by hydrogen peroxide. Food Chemistry and Toxicology, 1651-1635. doi:10.1111/j.1365-2621.2002.tb08696.x
- Özkan M, Kırca A & Cemeroğlu B (2003). Effect of moisture content on CIE colour values in dried apricots. European Food Research and Technology 216: 217–219. doi: 10.1007/s00217-002-0627-6
- Özkan M, Türkyılmaz M & Hamzaoğlu F (2016). The effects of SO2 concentration, polyphenol oxidase activity and apricot contents on the browning of apricots during sun-drying and storage at various temperatures. The Scientific and Technological Research Council of Turkey (TUBİTAK), Project Number: 113O456, pp. 141, Ankara, Turkey.
- Piga A, Pinna I, Özer KB, Agabbio M & Aksoy U (2004). Hot air dehydration of figs (Ficus carica L.): drying kinetics and quality loss. International Journal of Food Science and Technology: 39, 793–799. doi: 10.1111/j.1365-2621.2004.00845.x
- Rose AH (2007). Sulphur dioxide and other preservatives. Journal of Wine Research, 4(1), 43–47. doi: 10.1080/09571269308717947
- Sadler G, Davis J & Dezman D (1990). Rapid extraction of lycopene and -carotene from reconstituted tomato paste and pink grapefruit homogenates. Journal of Food Science 55: 1460-1461. doi: 10.1111/j.1365-2621.1990.tb03958.x
- Sağırlı F, Tağı Ş, Özkan M & Yemiş O (2008). Chemical and microbial stability of high moisture dried apricots during storage. Journal of the Science of Food and Agriculture 88(5): 858–869. doi: 10.1002/jsfa.3162
- Türkyılmaz M, Tağı Ş & Özkan M (2012). Changes in chemical and microbial qualities of dried apricots containing sulphur dioxide at different levels during storage. Food and Bioprocess Technology 6: 1526–1538. doi: 10.1007/s11947-012-0884-8