Thin-layer convective air drying of lemon verbena (lippia citriodora) leaves

نشریه پژوهشهای علوم و صنایع غذایی ایران

مقاله 1، دوره 12، شماره 6 - شماره پیاپی 42، بهمن و اسفند 1395، صفحه 716-729  

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/ifstrj.v12i6.61049

نویسندگان

عنایت الله نقوی ؛ صادق ریگی

دانشگاه تبریز

چکیده

Lemon verbena leave is a flavoring food additive as well as a good source of valuable compounds such as essential oils, flavonoids and phenolic acids. However, similar to many other aromatic plants, lemon verbena leave is perishable due to its high moisture content. The aim of this work was to study the effect of air temperature (45, 55, and 65°C) on the quality attributes of lemon verbena leaves during hot-air drying (HAD). The drying kinetics were also modeled. The results showed that higher drying temperature led to a significant decrease (p˂0.05) in the rehydration ratio due to a change in the structural features of the dried leaves. The essential oil content of dried samples was also significantly different (p˂0.05) from that of the fresh leaves due to high loss of volatile components and ranged from 0.42 to 0.85. Moreover, a significant increase in the value of effective moisture diffusivity (Deff) and color change was observed when the samples were dried at 65°C compared to 45°C. The value of Deff varied from 1.140×10-10 to 2.280×10-9 m2/s and the activation energy was found to be 31.04 kJ/mol. The greatest R2 (≥0.999) and the lowest RMSE and SSE were obtained for the Naghavi et al. model (proposed in this research)

مراجع

Aghbashlo, M., & Samimi-Akhijahani, H., 2008, Influence of drying conditions on the effective moisture diffusivity, energy of activation and energy consumption during the thin-layer drying of berberis fruit (Berberidaceae). Energy Conversion and Management, 49(10): 2865-2871.

Ahmed, J., Shivhare, U., & Singh, G., 2001, Drying characteristics and product quality of coriander leaves. Food and Bioproducts Processing, 79(2): 103-106.

Akbudak, N., & Akbudak, B., 2013, Effect of vacuum, microwave, and convective drying on selected parsley quality. International Journal of Food Properties, 16(1): 205-215.

AOAC, 1984. Official Methods of Analysis, Association of the Official Analytical Chemists, Washington, DC.

Aral, S., & Beşe, A. V., 2016, Convective drying of hawthorn fruit (Crataegus spp.): Effect of experimental parameters on drying kinetics, color, shrinkage, and rehydration capacity. Food Chemistry, 210: 577-584.

Argyropoulos, D., & Müller, J., 2014, Changes of essential oil content and composition during convective drying of lemon balm (Melissa officinalis L.). Industrial Crops and Products, 52: 118-124.

Chenarbon, H. A., Minaei, S., Bassiri, A. R., Almassi, M., Arabhosseini, A., & Motevali, A., 2012, Effect of drying on the color of St. John’s wort (Hypericum perforatum L.) leaves. International Journal of Food Engineering, 8(4), doi: 10.1515/1556-3758.2545.

Crank, J, 1975. The mathematics of diffusion, 2nd ed., Oxford University Press, London.

Doymaz, İ., 2006, Thin-layer drying behaviour of mint leaves. Journal of Food Engineering, 74(3): 370-375.

Doymaz, I., 2009, Thin‐layer drying of spinach leaves in a convective dryer. Journal of Food Process Engineering, 32(1): 112-125.

Doymaz, I., 2012, Air drying characteristics, effective moisture diffusivity and activation energy of grape leaves. Journal of Food Processing and Preservation, 36(2): 161-168.

Doymaz, I., Kipcak, A. S., & Piskin, S., 2015, Characteristics of thin-layer infrared drying of green bean. Czech Journal of Food Sciences, 33(1): 83-90.

Erbay, Z., & Icier, F., 2010, Thin‐layer drying behaviors of olive leaves (Olea europaea L.). Journal of Food Process Engineering, 33(2): 287-308.

Ertekin, C., & Heybeli, N., 2014, Thin‐layer infrared drying of mint leaves. Journal of Food Processing and Preservation, 38(4): 1480-1490.

Funes, L., Fernandez-Arroyo, S., Laporta, O., Pons, A., Roche, E., Segura-Carretero, A., Fernandez-Gutierrez, A., & Micol, V., 2009, Correlation between plasma antioxidant capacity and verbascoside levels in rats after oral administration of lemon verbena extract. Food Chemistry, 117(4): 589-598.

Jangam, S. V., Joshi, V. S., Mujumdar, A. S., & Thorat, B. N., 2008, Studies on dehydration of sapota (Achras zapota). Drying Technology, 26(3): 369-377.

Kaya, A., & Aydın, O., 2009, An experimental study on drying kinetics of some herbal leaves. Energy Conversion and Management, 50(1): 118-124.

Lemus‐Mondaca, R., Vega‐Galvez, A., Moraga, N. O., & Astudillo, S., 2015, Dehydration of Stevia rebaudiana Bertoni leaves: kinetics, modeling and energy features. Journal of Food Processing and Preservation, 39(5): 508-520.

Nozad, M., Khojastehpour, M., Tabasizadeh, M., Azizi, M., Ashtiani, S.-H. M., & Salarikia, A., 2016, Characterization of hot-air drying and infrared drying of spearmint (Mentha spicata L.) leaves. Journal of Food Measurement and Characterization, 10(3): 1-8.

Oberoi, D. P. S., & Sogi, D. S., 2015, Drying kinetics, moisture diffusivity and lycopene retention of watermelon pomace in different dryers. Journal of food science and technology, 52(11): 7377-7384.

Pereira, C. G., & Meireles, M. A. A., 2007, Evaluation of global yield, composition, antioxidant activity and cost of manufacturing of extracts from lemon verbena (Aloysia triphylla [L'Herit.] Britton) and mango (Mangifera indica L.) leaves. Journal of Food Process Engineering, 30(2): 150-173.

Rahimmalek, M., & Goli, S. A. H., 2013, Evaluation of six drying treatments with respect to essential oil yield, composition and color characteristics of Thymys daenensis subsp. daenensis. Celak leaves. Industrial Crops and Products, 42: 613-619.

Roshanak, S., Rahimmalek, M., & Goli, S. A. H., 2016, Evaluation of seven different drying treatments in respect to total flavonoid, phenolic, vitamin C content, chlorophyll, antioxidant activity and color of green tea (Camellia sinensis or C. assamica) leaves. Journal of food science and technology, 53(1): 721-729.

Said, L. B. H., Najjaa, H., Farhat, A., Neffati, M., & Bellagha, S., 2015, Thin layer convective air drying of wild edible plant (Allium roseum) leaves: experimental kinetics, modeling and quality. Journal of food science and technology, 52(6): 3739-3749.

Salarikia, A., Miraei Ashtiani, S. H., & Golzarian, M. R., 2016, Comparison of drying characteristics and quality of peppermint leaves using different drying methods. Journal of Food Processing and Preservation, doi: 10.1111/jfpp.12930 (in press).

Sellami, I. H., Wannes, W. A., Bettaieb, I., Berrima, S., Chahed, T., Marzouk, B., & Limam, F., 2011, Qualitative and quantitative changes in the essential oil of Laurus nobilis L. leaves as affected by different drying methods. Food Chemistry, 126(2): 691-697.

Shahhoseini, R., Ghorbani, H., Karimi, S. R., Estaji, A., & Moghaddam, M., 2013, Qualitative and quantitative changes in the essential oil of lemon verbena (Lippia citriodora) as affected by drying condition. Drying Technology, 31(9): 1020-1028.

Tasirin, S. M., Puspasari, I., Lun, A., Chai, P., & Lee, W., 2014, Drying of kaffir lime leaves in a fluidized bed dryer with inert particles: Kinetics and quality determination. Industrial Crops and Products, 61: 193-201.

Therdthai, N., & Zhou, W., 2009, Characterization of microwave vacuum drying and hot air drying of mint leaves (Mentha cordifolia Opiz ex Fresen). Journal of Food Engineering, 91(3): 482-489.

Vega-Galvez, A., Ah-Hen, K., Chacana, M., Vergara, J., Martinez-Monzo, J., Garcia-Segovia, P., Lemus-Mondaca, R., & Di Scala, K., 2012, Effect of temperature and air velocity on drying kinetics, antioxidant capacity, total phenolic content, colour, texture and microstructure of apple (var. Granny Smith) slices. Food Chemistry, 132(1): 51-59.

Zogzas, N., Maroulis, Z., & Marinos-Kouris, D., 1996, Moisture diffusivity data compilation in foodstuffs. Drying Technology, 14(10): 2225-2253.