Evaluation of Persimmon (Diospyros kaki L.) with Alternative Drying Technologies: Comparison of Laser-Heated, Convective, and Lyophilization Methods

Öz

This study evaluates the physicochemical quality characteristics of Diospyros kaki L. (cultivars ‘Hana Fuyu’ and ‘Jiro’) processed using three distinct drying technologies: convective (oven), freeze (lyophilization), and laser-heated drying. Key quality parameters, including color, pH, water activity (aw), dry matter content, texture, and the presence of aflatoxin, were comprehensively analyzed to assess the industrial viability of each method. The results indicated that while freeze-drying offered the highest retention of color and gloss, its industrial application is constrained by high energy consumption and prolonged processing times. Conversely, oven drying achieved the highest dry matter content but resulted in significant degradation of color and aroma. Notably, laser-heated drying emerged as a superior alternative, characterized by excellent color and flavor preservation, desirable textural properties with low hardness values (0.87–0.89 N), and the highest pH levels, all achieved within a significantly reduced processing time. Furthermore, all drying methods successfully reduced water activity below the microbial safety limit (<0.6), and no aflatoxin contamination was detected in any samples. Consequently, the Laser Heated Drying system is identified as a promising, energy-efficient, and competitive technology for the industrial-scale processing of persimmons, combining high sensory quality with rapid processing capabilities. Optimization of process parameters is recommended to facilitate the commercial adoption of this innovative method.

Anahtar Kelimeler

• Persimmon
• laser-heated drying
• freeze drying
• oven drying
• aflatoxin

Destekleyen Kurum

Hatay Mustafa Kemal University Scientific Research Projects Commission (HMKU/BAP - Project No.: 22.YL.008)

Proje Numarası

22.YL.008

Etik Beyan

There are no human or animal studies that require an ethical declaration.

Teşekkür

This work was supported by the Hatay Mustafa Kemal University Scientific Research Projects Commission (HMKU/BAP - Project No.: 22.YL.008), and the authors would also like to thank the Hatay Mustafa Kemal University - Technology, Research and Development Center (MARGEM) and Arden Gıda (Adana, Turkiye) for their assistance in laser-heated drying processes

Trabzon Hurmasının (Diospyros kaki L.) Alternatif Kurutma Teknolojileriyle Değerlendirilmesi: Lazer Isıtmalı, Konvektif ve Liyofilizasyon Yöntemlerinin Karşılaştırılması

Öz

Bu çalışmada, Trabzon hurmasının (Diospyros kaki L.) Hana Fuyu ve Jiro çeşitlerinin farklı kurutma yöntemleriyle (konvektif/etüvde, dondurarak/liyofilizasyon ve lazer ısıtmalı) işlenmesi sonucunda elde edilen ürünlerin fiziksel ve kimyasal kalite özellikleri incelenmiştir. Çalışma kapsamında renk, pH, su aktivitesi, kuru madde, tekstür ve aflatoksin varlığı analiz edilmiştir. Elde edilen bulgulara göre, dondurarak kurutma yöntemi ürünün renk ve parlaklığını en iyi koruyan yöntem olurken, yüksek enerji gereksinimi ve uzun kuruma süresi nedeniyle endüstriyel uygulamalarda sınırlı kalmaktadır. Etüvde kurutma, en yüksek kuru madde oranını sağlamış ancak renk ve aroma kaybına neden olmuştur. Lazer ısıtmalı kurutma yöntemi, kısa işlem süresinde yüksek renk ve lezzet korunumu, düşük sertlik değerleri (0.87–0.89 N) ve en yüksek pH değerleri ile öne çıkmıştır. Tüm yöntemlerde ürünlerin su aktivitesi değerleri mikrobiyal gelişim sınırı olan 0.6’nın altında bulunmuş ve hiçbir örnekte aflatoksin tespit edilmemiştir. Sonuç olarak, yüksek kaliteli duyusal ve kimyasal parametreleri, enerji verimliliği ve kısa işlem süresi avantajlarıyla birleştiren Lazer Isıtmalı Kurutma sisteminin, Trabzon hurmasının endüstriyel ölçekte işlenmesi için gelecek vaat eden, rekabetçi bir teknoloji olduğu tespit edilmiştir. Bu bulgular ışığında, ticari uygulamalar için bu yenilikçi yöntemin optimum proses parametrelerinin belirlenmesi önerilmektedir.

Anahtar Kelimeler

• Trabzon hurması
• lazer ısıtmalı kurutma
• dondurarak kurutma
• etüvde kurutma
• aflatoksin

Destekleyen Kurum

Hatay Mustafa Kemal Üniversitesi Bilimsel Araştırma Projeleri Komisyonu (HMKU/BAP - Proje No.: 22.YL.008)

Proje Numarası

22.YL.008

Etik Beyan

Etik beyan gerektirecek insan ve hayvan çalışması bulunmamaktadır

Teşekkür

Bu çalışma, Hatay Mustafa Kemal Üniversitesi Bilimsel Araştırma Projeleri Komisyonu (HMKU/BAP - Proje No: 22.YL.008) tarafından desteklenmiştir ve yazarlar ayrıca lazerle ısıtmalı kurutma işlemlerindeki yardımları için Hatay Mustafa Kemal Üniversitesi Teknoloji, Araştırma ve Geliştirme Merkezi (MARGEM) ve Arden Gıda'ya (Adana, Türkiye) teşekkür ederler.

Kaynakça

1. Abbaspour-Gilandeh, Y., Kaveh, M., Fatemi, H., Hernández-Hernández, J. L., Fuentes-Penna, A., and Hernández-Hernández, M. (2020). Evaluation of the changes in thermal, qualitative, and antioxidant properties of terebinth (Pistacia atlantica) fruit under different drying methods. Agronomy, 10(9), 1378.
2. Açu, M., and Özdestan Ocak, B. (2010). Gıdalarda aflatoksin düzeylerinin belirlenmesinde kullanılan analiz yöntemleri. Akademik Gıda, 8(2), 50–55. (in Turkish)
3. Aguilar F, Salazar M, Fuentes L, Calderini D, Jerez A, Contreras C. Increased Temperature Effects During Fruit Growth and Maturation on the Fruit Quality, Sensory and Antioxidant Properties of Raspberry (Rubus idaeus L.) cv. Heritage. (2025). Foods. Mar 29;14(7):1201. doi: 10.3390/foods14071201. PMID: 40238340; PMCID: PMC11988984
4. Akyıldız, A., Aksay, S., Benli, H., Kıroğlu, F., and Fenercioğlu, H. (2004). Determination of changes in some characteristics of persimmon during dehydration at different temperatures. Journal of Food Engineering, 65(1), 95-99.
5. Altunkanat, H., Göksel, Z., & Kayahan, S. (2025). Trabzon Hurmasi (Diospyros Kaki L.) Meyvesinin Özellikleri, Muhafaza ve Değerlendirme Yöntemleri. Gıda, 50(5), 700-712. https://doi.org/10.15237/gida.GD25042
6. American Association of Cereal Chemists (AACC). (2002). Approved methods of the American Association of Cereal Chemists (10th ed.). AACC International. Ann, N., Sridhar, S. B., Julie, E., Wadhwa, T., & Shareef, J. (2025). Physicochemical, Nutritional, and Pharmacological Properties of Persimmon (Diospyros kaki). International Journal of Nutrition, Pharmacology, Neurological Diseases, 15(2), 159-163.
7. AOAC. (1990). Official methods of analysis (15th ed.). Association of Official Analytical Chemists. Arkain, B., and Alibas, I. (2025). Effect of different drying methods on bioactive potential and nutrients of medlar fruit. Scientific Reports, 15(1), 10202.
8. Ashtiani, S. H. M., & Martynenko, A. (2025). Nature-inspired approaches for optimizing food drying processes: A critical review. Food Engineering Reviews, 17(2), 270-290.

9. Bas-Bellver, C., Barrera, C., Betoret, N., and Seguí, L. (2022). Impact of disruption and drying conditions on physicochemical, functional, and antioxidant properties of powdered ingredients obtained from Brassica vegetable by-products. Foods, 11(22), 3663.
10. Bayram, Y. 2024. Optimizing the extraction of polyphenols from Prunus spinosa L. fruit using response surface methodology and production of powders from optimized extracts by foam mat drying. Journal of Food Measurement and Characterization, 18, 6673–6686. Bozkir, H., and Ergün, A. R. 2020. Effect of sonication and osmotic dehydration applications on the hot air drying kinetics and quality of persimmon. LWT, 131, 109704.
11. Butt, M.S., Sultan, M.T., Aziz, M., Naz, A., Ahmed, W., Kumar, N., Imran, M. (2015). Persimmon (Diospyros kaki) fruit: hidden phytochemicals and health claims. EXCLI J. 2015 May 4;14:542-61. doi: 10.17179/excli2015-159. PMID: 27047315; PMCID: PMC4817420.
12. Cemeroğlu, B., Karadeniz, F., and Özkan, M. (2003). Meyve ve Sebze İşleme Teknolojisi. Gıda Teknolojisi Derneği Yayınları. (in Turkish)
13. Ceylan, I., Aktaş, M., and Doğan, H. (2006). Güneş enerjili kurutma fırınında elma kurutulması. Politeknik Dergisi, 9(4), 289-294. (in Turkish)
14. Chen, X. N., Fan, J. F., Yue, X., Wu, X. R., and Li, L. T. (2008). Radical scavenging activity and phenolic compounds in persimmon (Diospyros kaki L. cv. Mopan). Journal of Food Science, 73(1), C24–C28.
15. Dikme, T. G. 2025. Preservation of bioactive compounds in mulberry species (Morus spp.) under different drying conditions. Scientific Reports, 15(1), 31398.
16. Djekic, I., Tomic, N., Bourdoux, S., et al. 2018. Comparison of three types of drying (supercritical CO2, air, and freeze) on the quality of dried apple–Quality index approach. LWT, 94, 64-72.
17. Ertekin, Ö., and İpek, Y. 2020. Modeling of drying processes of dates (Phoenix, Arecaceae) with oven or TGA and microbiological properties of fresh and dried dates. International Journal of Fruit Science, 20(sup3), S1530–S1538.
18. Food and Agriculture Organization [FAO]. (2026). GENERAL STANDARD FOR DRIED FRUITS CXS 360-2020 Adopted in 2020. FAO - WHO - Codex Alimentarius International Food Standarts. https://www.fao.org/fao-who-codexalimentarius/ Access date: 18.05.2026
19. Frost, S. C., Harbertson, J. F., & Heymann, H. (2017). A full factorial study on the effect of tannins, acidity, and ethanol on the temporal perception of taste and mouthfeel in red wine. Food Quality and Preference, 62, 1-7.
20. Gao, Q. H., Wu, C. S., Wang, M., Xu, B. N., and Du, L. J. 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.
21. Geankoplis, C. J. 1993. Transport processes and unit operations (3rd ed.). Prentice Hall International.
22. Güngör, A., and Özbalta, N. 1997. Endüstriyel kurutma sistemleri. III. Ulusal Tesisat Mühendisliği Kongresi ve Sergisi Bildiriler Kitabı (Vol. 2, pp. 737-747). TMMOB Makina Mühendisleri Odası. (in Turkish)
23. Giannakourou, M.C., Semenoglou, I., Arvaniti, M. et al. (2025). Effect of Temperature and Water Activity on the Quality Kinetics of Packaged Fish Powder During Storage. Food Bioprocess Technol 18, 8482–8497. https://doi.org/10.1007/s11947-025-03931-5
24. Hossain, A., & Shahidi, F. (2023). Persimmon Leaves: Nutritional, Pharmaceutical, and Industrial Potential—A Review. Plants, 12(4), 937. https://doi.org/10.3390/plants12040937
25. Hssaini, L., Ouaabou, R., Hanine, H., ... and Ennahli, S. 2021. Kinetics, energy efficiency and mathematical modeling of thin layer solar drying of figs (Ficus carica L.). Scientific Reports, 11, 21266.
26. Jha, P. K., Chapleau, N., Meyers, P. E., Pathier, D., and Le-Bail, A. 2024. Can cryogenic freezing preserve the quality of fruit matrices during long-term storage compared to the mechanical method? Applied Food Research, 4(1), 100374.
27. Jovanovic, D. J. (Ed.). 2023. A comprehensive review of the versatile dehydration processes. IntechOpen. Kaba, B., Yıkılkan, Y., Pashazadeh, H.,et al. 2025. Production of cornelian cherry (Cornus mas L.) pulp powder by foam-mat drying: Analysis of physicochemical and antioxidant properties. Biomass Conversion and Biorefinery, 15, 3663–3678.
28. Kaplan, M., Çetin, N., Çiftci, B., and Karpuzcu, S. 2025. Comparison of drying methods for biochemical composition, energy aspects, and color properties of alfalfa hay. Biomass Conversion and Biorefinery, 15(7), 10331-10346.
29. Kaveh, M., Zomorodi, S., Ghaysari, B., El-Mesery, H. S., Sharifian, F., ElMesiry, A. H., and Salem, A. 2025. Impact of various drying technologies for evaluation of drying kinetics, energy consumption, physical and bioactive properties of Rose flower. Scientific Reports, 15(1), 9245.
30. Keskin, M., Guclu, G., Sekerli, Y. E., Soysal, Y., Selli, S., & Kelebek, H. (2021). Comparative assessment of volatile and phenolic profiles of fresh black carrot (Daucus carota L.) and powders prepared by three drying methods. Scientia Horticulturae, 287, 110256.
31. Kilcast, D. (Ed.). 2010. Instrumental assessment of food sensory quality: A practical guide. Woodhead Publishing. Kingsly, A. R. P., and Singh, D. B. 2007. Drying kinetics of pomegranate arils. Journal of Food Engineering, 79(3), 741–744.
32. Lim, Y.J., and Eom, S.H. (2022). The Different Contributors to Antioxidant Activity in Thermally Dried Flesh and Peel of Astringent Persimmon Fruit. Antioxidants (Basel). Mar 21;11(3):597. doi: 10.3390/antiox11030597. PMID: 35326247; PMCID: PMC8945473.
33. López-Bermudo, L., Moreno-Chamba, B., Salazar-Bermeo, J., Hayward, N.J., Morris, A., Duncan, G.J., Russell, W.R., Cárdenas, A., Ortega, Á., Escudero-López, B., Berná, G., Martí Bruña, N., Duncan, S.H., Neacsu, M., and Martin, F.
34. (2024). Persimmon Fiber-Rich Ingredients Promote Anti-Inflammatory Responses and the Growth of Beneficial Anti-Inflammatory Firmicutes Species from the Human Colon. Nutrients. 2024 Aug 1;16(15):2518. doi: 10.3390/nu16152518. PMID: 39125398; PMCID: PMC11314113
35. Lotfy, K., Al‐Qahtani, S., Al-Harbi, N., ... and El-Sayed, S. M. 2022. Decontamination potential of date palm fruit via non-thermal plasma technique. Scientific Reports, 12, 17323.
36. Ma, Y., Tian, X., Wang, Y., Zhao, H., and Song, J. 2023. Comparative study on drying characteristics and quality of apple cubes dried in two different microwave dryers. Polish Journal of Food and Nutrition Sciences, 73(4), 367–374.
37. Mannino, S., and Cosio, M. S. 1997. Determination of ascorbic acids in food stuff by microdialysis sampling and liquid chromatography with electrochemical detection. Analyst, 122, 1153-1154.
38. Matsuo, T. 1998. Mechanism of astringency removal in persimmon fruit. Proceedings of the International Symposium on Persimmon, Nara, Japan.
39. Medel-Marabolí M, Romero JL, Obreque-Slier E, Contreras A, Peña-Neira A. 2017. Effect of a commercial tannin on the sensorial temporality of astringency. Food Res Int. 2017 Dec;102:341-347. doi: 10.1016/j.foodres.2017.09.099. Epub 2017 Oct 3. PMID: 29195957
40. Njumbe Ediage, E., Van Poucke, C., and De Saeger, S. 2015. A multi-analyte LC–MS/MS method for the analysis of 23 mycotoxins in different sorghum varieties: The forgotten sample matrix. Food Chemistry, 177, 397–404.
41. Nowacka, M., Tylewicz, U., Tappi, S., Siroli, L., Lanciotti, R., Romani, S., and Witrowa-Rajchert, D. 2018. Ultrasound assisted osmotic dehydration of organic cranberries (Vaccinium oxycoccus): Study on quality parameters evolution during storage. Food Control, 93, 40-47.
42. Öz, A. T., and Özelkök, İ. S. 2003. ‘Moralı’ Trabzon hurması (Diospyros kaki L.) meyvesinin burukluğunun giderilmesinde kuru buz uygulamasının etkisi. Bahçe, 32(1-2), 7–13. (in Turkish)
43. Pinto, M., Kusch, C., Belmonte, K., Valdivia, S., Valencia, P., Ramírez, C., & Almonacid, S. (2024). Application of CO2-Laser Micro-Perforation Technology to Freeze-Drying Whole Strawberry (Fragaria ananassa Duch.): Effect on Primary Drying Time and Fruit Quality. Foods, 13(10), 1465. https://doi.org/10.3390/foods13101465
44. Polatçı, H. 2013. Tokat ilinde güneş enerji destekli ısı pompalı bir kurutucu sistem geliştirilmesi ve domates kurutma performansının farklı kurutma sistemleri ile karşılaştırılması (PhD Thesis). Atatürk Üniversitesi Fen Bilimleri Enstitüsü, Erzurum, Türkiye. (in Turkish)
45. Prayitno, S. A., Utami, D. R., & Mahmudah, R. I. (2025). Effects of high temperatures on food stability: nutritional, chemical, physical, organoleptic, and microbiological impacts. Academic Letters, 1(3), 41-46
46. Ramachandran, R.P., Nadimi, M., Cenkowski, S. et al. (2024). Advancement and Innovations in Drying of Biopharmaceuticals, Nutraceuticals, and Functional Foods. Food Eng Rev 16, 540–566 https://doi.org/10.1007/s12393-024-09381-7
47. Rashwan, M. R. A., Khalifa, A. H., Zeiad, F. K. A., and Mohamed, M. I. A. 2017. Nutrient and phytochemical compounds of persimmon and husk tomato. Assiut Journal of Agricultural Sciences, 48, 102-112.
48. Santos, A. A. d. L., Leal, G. F., Marques, M. R., Reis, L. C. C., Junqueira, J. R. d. J., Macedo, L. L., & Corrêa, J. L. G. (2025). Emerging Drying Technologies and Their Impact on Bioactive Compounds: A Systematic and Bibliometric Review. Applied Sciences, 15(12), 6653. https://doi.org/10.3390/app15126653
49. Schouten, M. A., Santanatoglia, A., Angeloni, S., Ricciutelli, M., Acquaticci, L., Caprioli, G., ... and Romani, S. 2024. Effects of nuts, dried fruits, dried seeds and black olives as enrichment ingredients on acrylamide concentrations in sweet and savoury biscuits. Food and Bioprocess Technology, 17(6), 1525-1538.
50. Sertkaya, V., and Gürel İnanlı, A. 2023. Farklı soslarda vakum paketlenmiş kerevitlerin (Astacus leptodactylus ESCH., 1823) raf ömrünün belirlenmesi. Ecological Life Sciences, 18(4), 156-165.
51. Soysal, Y. (2004). Microwave drying characteristics of parsley. Biosystems Engineering, 89(2), 167–173.
52. Taira, S., Ono, M., and Matsumoto, N. 1997. Reduction of persimmon astringency by complex formation between pectin and tannins. Postharvest Biology and Technology, 12(3), 265-271.
53. Türk Standardları Enstitüsü [TSE]. (1987). Trabzon Hurması (TS 5919). https://www.tse.org.tr Access date: 18.05.2026
54. United Nations Economic Commission for Europe [UNECE]. (2026). Recommendation on trial through 2022 for UNECE STANDARD DDP-xx concerning the marketing and commercial quality control of Dried Persimmons 2021 EDITION. https://unece.org/sites/default/files/2024-02/DDP_Rec_DriedPersimmons_2021 Access date: 18.05.2026
55. Urbano, D. G., Aquino, A., & Scrucca, F. (2023). Energy Performance, Environmental Impacts and Costs of a Drying System: Life Cycle Analysis of Conventional and Heat Recovery Scenarios. Energies, 16(3), 1523. https://doi.org/10.3390/en16031523
56. Ünlütürk, A., & Turantaş, F. 1999. Gıda Mikrobiyolojisi. Sidas Yayıncılık. (in Turkish)
57. Vakula, A., Tepić Horecki, A., Pavlić, B., Jokanović, M., Ognjanov, V., Milović, M., ... and Šumić, Z. 2021. Application of different techniques on stone fruit (Prunus spp.) drying and assessment of physical, chemical and biological properties: Characterization of dried fruit properties. Journal of Food Processing and Preservation, 45(2), e15158.
58. Wang, T., Yang, Q., Hu, L., Deng, D., Jiang, J., and Hu, C. 2025. Study on the effects of different drying methods on the quality characteristics of Xinjiang gray jujube. SSRN. https://dx.doi.org/10.2139/ssrn.5205739 Wojdyło, A., Lech, K., and Nowicka, P. 2020. Effects of different drying methods on the retention of bioactive compounds, on-line antioxidant capacity and color of the novel snack from red-fleshed apples. Molecules, 25(23), 5521.
59. Wolf, S., Garbade, L., Göken, V., Tien, R., Börner, M., Neb, D., & Heimes, H. H. (2023). Process and Material Analysis of Laser- and Convection-Dried Silicon–Graphite Anodes for Lithium-Ion Batteries. World Electric Vehicle Journal, 14(4), 87. https://doi.org/10.3390/wevj14040087
60. Wright, K., and Kader, A. A. 1997. Effect of slicing and controlled-atmosphere storage on the ascorbate content and quality of strawberries and persimmons. Postharvest Biology and Technology, 10, 39–48.
61. Yağcıoğlu, A. 1999. Tarım ürünleri kurutma tekniği – I. Ege Üniversitesi Ziraat Fakültesi Yayınları. (in Turkish)
62. Yıldız Akbulut, E. 2021. Farklı koşullarda kurutulan Trabzon hurması (Diospyros kaki) ve kivi (Actinidia deliciosa)’nin bazı fizikokimyasal ve mikrobiyolojik kalite parametrelerinin incelenmesi (Master's thesis). Afyon Kocatepe Üniversitesi Fen Bilimleri Enstitüsü, Afyon, Türkiye. (in Turkish)
63. Zhang, Y., Yue, R., Zhu, H., Zhang, W., Ma, C., Deng, S., and Sun, J. 2024. Effect of physical field-assisted freezing on the quality attributes of frozen baked sweet potato and its optimization. Journal of Food Measurement and Characterization, 18(11), 9573-9587.