Compositional Changes of the Jujube Fruit During Solar and Tray Drying

Abstract

This study aims to determine the changes in some components of jujube fruit after drying in the solar and tray dryer, and to choose the appropriate drying method in terms of component loss. In this study, jujube fruit (Zizyphus jujuba Mill.) was used as material and were obtained from producers in the Çivril-Denizli regions of Turkey. Firstly, we analysed the total soluble solids, dry matter, titratable acidity, pH, total phenolic content, organic acids (malic, citric, succinic and tartaric acid), sugars (glucose, fructose and sucrose) and water-soluble vitamins (ascorbic acid, riboflavin, niacin, pyridoxine and thiamine) in fresh jujube fruit. Secondly, the fresh jujube fruits were dried in the solar and tray dryer (50, 60 and 70 °C). Following the drying processes, changes of the above-mentioned parameters were evaluated. The total phenolic content was determined using the spectrophotometric method. Sugars, organic acids and water-soluble vitamins content were determined using a high-performance liquid chromatography (HPLC) instrument. The solar drying of the jujube fruit resulted in glucose and sucrose content decrement and in fructose content increment, while tray drying resulted in decrement in glucose, fructose and sucrose content. A high decrement in organic acids and water-soluble vitamins content of the jujube fruit both in the solar and tray drying process was determined. In addition, solar drying resulted in more vitamin content decrement compared to the tray drying.

Keywords

• HPLC
• Zizyphus jujuba Mill.
• organic acids
• sugars
• water-soluble vitamin

References

1. Abd-Alrahman S H, Salem-Bekhit M M & Elhalwagy M E (2013). Chemical composition and antimicrobial activity of Ziziphus jujuba seeds extract. Journal of Pure and Applied Microbiology 7:379-385
2. Artık N, Bayındırlı L, ve Mert İ (2011) Karbonhidratlar, Mısır Şekeri ve Gıda Endüstrisinde Kullanımı, Türkiye Gıda ve İçecek Sanayii Dernekleri Federasyonu, Comart
3. Association of Official Analytical Chemists—AOAC (1990). Official methods of analysis. Association of official analytical chemists, IAC, Arlington
4. Elmas F, Varhan E & Koç M (2019). Drying characteristics of jujube (Zizyphus jujuba) slices in a hot air dryer and physicochemical properties of jujube powder. Journal of Food Measurement and Characterization 13(1):70-86
5. Fang S, Wang Z & Hu X (2009). Hot air drying of whole fruit Chinese jujube (Zizyphus jujuba Miller): Thin‐layer mathematical modelling. International Journal of - Science and Research 44(9):1818-1824
6. Genç M (2005). Süs Bitkisi Yetiştiriciliği. Temel Üretme Teknikleri. Süleyman Demirel Üniversitesi Yayını, 1. Cilt, Isparta, pp 369 Gao Q H, Wu P T, Liu J R, Wu C S, Parry J W & Wang M (2011). Physico-chemical properties and antioxidant capacity of different jujube (Ziziphus jujuba Mill.) cultivars grown in loess plateau of China. Scientia Horticulturae 130(1): 67-72
7. Gao Q H, Wu C S, Wang M, Xu B N & Du LJ (2012). Effect of drying of jujubes (Ziziphus jujuba Mill.) on the contents of sugars, organic acids, α-tocopherol, β-carotene, and phenolic compounds. Journal of Agricultural and Food Chemistry 60(38):9642-9648
8. Gao Q H, Wu C S & Wang M (2013). The jujube (Ziziphus jujuba Mill.) fruit: A review of current knowledge of fruit composition and health benefits. Journal of Agricultural and Food Chemistry 61(14): 351-3363

9. Hernández F, Noguera‐Artiaga L, Burló F, Wojdyło A, Carbonell‐Barrachina Á A & Legua P (2016). Physico‐chemical, nutritional, and volatile composition and sensory profile of Spanish jujube (Ziziphus jujuba Mill.) fruits. Journal of the Science of Food and Agriculture 96(8):2682-2691
10. Kadakal Ç, Poyrazoğlu E S, Artık N & Nas S (2004). Effect of Activated Charcoal on Water-Soluble Vitamin Content of Apple Juice. Journal of Food Quality 27:171‒180
11. Kaur S, Kumar M, Pandit K, Kumar A & Kaur S (2019). Potential health benefits of nutraceuticals for human health. Environmental Contaminants and Natural Products; Bentham Science Publishers: Sharjah, United Arab Emirates, pp193-208
12. Levent, O. (2017). Malatya kayısılarından elde edilen kayısı soslarının fiziksel, kimyasal, uçucu organik bileşikler ve reolojik özellikleri üzerine proses koşullarının etkisi.
13. Miri M S (2018). Cultivation, chemical compositions and health benefits of jujube (Ziziphus jujuba Mill.). In Ist National Congress and International Fair of Medicinal Plants and Strategies for Persian Medicine that Affect Diabetes. Mashhad, Iran
14. Omid B (1997). Approach the production and processing plants. Tehran, Tarahan Publisher, Iran, pp 109-110 Proestos C (2020). The benefits of plant extracts for human health. Foods 9(11):1653
15. Promyou S, Supapvanich S, Boodkord B & Thangapiradeekajorn M (2012). Alleviation of Chilling Injury in Jujube Fruit by Dipping in 350 oC Water. Kasetsart Journal - Natural Science 46:107-119
16. Rahman E, Momin A, Zhao L, Guo X, Xu D, Zhou F & Ji B (2018). Bioactive, nutritional composition, heavy metal and pesticide residue of four Chinese jujube cultivars. Food Science Biotechnology 27(2):323-331 SAS® (1985). Institute. SAS user’s guide. Statistics. Version 5th Ed. Cary, NC, SAS Institute Inc
17. Shahrajabian M H, Khoshkharam M, Zandi P, Solar W & Cheng Q (2019). Jujube, a super-fruit in traditional Chinese medicine, heading for modern pharmacological science. Journal of Medicinal Plants Studies 7(4):173-178
18. Singleton V L & Rossi J R (1965). Colorimetry of total phenolics with phosphomolibdic - phosphothungstic acid. American Journal of Enology and Viticulture 16:144-158
19. Soni H & Malik J K (2021). Phyto-Pharmacological Potential of Zizyphus jujube: A Review. Scholars International Journal of Biochemistry 4(2):1-5
20. Soyer Y, Koca N & Karadeniz F (2003). Organic Acid Profile of Turkish White Grapes and Grape Juices. Journal of Food Composition and Analysis 16:629-636
21. Sturm K, Koron D & Stampar F (2003). The composition of fruit of different strawberry varieties depending on maturity stage. Food Chemistry 83:417–422
22. Tepe B & Ekinci R (2021). Drying characteristics and some quality parameters of whole jujube (Zizyphus jujuba Mill.) during hot air drying. Italian Journal of Food Science 33(1):1-15
23. Wang B, Huang Q, Venkitasamy C, Chai H, Gao H, Cheng N, Cao W, Lv X & Pan Z (2016). Changes in phenolic compounds and their antioxidant capacities in jujube (Ziziphus jujuba Miller) during three edible maturity stages. LWT - Food Science and Technology 66:56-62
24. Williams J T (2006). Ber and Other Jujubes Fruits for the Future 2
25. Wojdyło A, Figiel A, Legua P, Lech K, Carbonell-Barrachina Á A & Hernández F (2016). Chemical composition, antioxidant capacity, and sensory quality of dried jujube fruits as affected by cultivar and drying method. Food Chemistry 207:170-179
26. Yücel E (2005). Ağaçlar ve Çalılar, Eskişehir, pp 301