Drying Kinetics, Rehydration Behavior and Morphological Properties of Pre-Blanched Thai Basil Leaves
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Abstract
Drying characteristics of Thai basil (Ocimum basilicum var. thyrsiflorum) leaves during the hot-air drying process at different air temperatures with and without blanching pre-treatment were in-depth investigated. The increase in drying rate and decrease in drying time were observed at elevated temperatures. Blanching further reduced the drying time by approximately 19–45%, indicating to potentially reduce the energy consumption of drying. The Midilli et al. model demonstrated the best fitting to describe the process. The effective moisture diffusivity was computed as 0.21–1.55×10–10 m2s–1. The lower activation energy of water removal during drying for blanched leaves indicated that blanching had more energy efficiency at lower temperatures. Blanching also improved the rehydration capacity of dried leaves. Microstructural analysis revealed that blanching caused the collapse of the cellular structure and shrinkage and hence reduced the resistance of moisture removal leading to a higher drying rate. The findings in this work prove that blanching can be a potential approach to save consumed energy, reduce drying time, and hence potentially preserve beneficial properties of bioactive compounds in agricultural plants.
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A. K. Pandey, P. Singh, and N. N. Tripathi, “Chemistry and bioactivities of essential oils of some Ocimum species: An overview,” Asian Pacific Journal of Tropical Biomedicine, vol. 4, pp. 682–694, 2014.
T. Tangpao, H. H. Chung, and S. R. Sommano, “Aromatic profiles of essential oils from five commonly used Thai basils,” Foods, vol. 7, 2018, Art. no. 175.
H. Abramovic, V. Abram, A. Cuk, B. Ceh, S. Smole-Mozina, M. Vidmar, M. Pavlovic, and N. P. Ulrih, “Antioxidative and antibacterial properties of organically grown thyme (Thymus sp.) and basil (Ocimum basilicum L.),” Turkish Journal of Agriculture and Forestry, vol. 42, pp. 185–194, 2018.
I. Doymaz, “Thin-layer drying behaviour of mint leaves,” Journal of Food Engineering, vol. 74, pp. 370–375, 2006.
H. W. Xiao, C. L. Pang, L. H. Wang, J. W. Bai, W. X. Yang, and Z. J. Gao, “Drying kinetics and quality of Monukka seedless grapes dried in an air-impingement jet dryer,” Biosystems Engineering, vol. 105, pp. 233–240, 2010.
R. Baini and T. Langrish, “Choosing an appropriate drying model for intermittent and continuous drying of bananas,” Journal of Food Engineering, vol. 79, pp. 330–343, 2007.
İ. T. Toğrul and D. Pehlivan, “Modeling of drying kinetics of single apricot,” Journal of Food Engineering, vol. 58, pp. 23–32, 2003.
L. M. Diamante, R. Ihns, G. P. Savage, and L. Vanhanen, “A new mathematical model for thin layer drying of fruits,” International Journal of Food Science and Technology, vol. 45, pp. 1956–1962, 2010.
M. Aghbashlo, M. H. Kianmehr, and A. Arabhosseini, “Modeling of thin-layer drying of potato slices in length of continuous band dryer,” Energy Conversion and Management, vol. 50, pp. 1348–2009.
K. O. Falade and O. J. Solademi, “Modeling of air drying of fresh and blanched sweet potato slices,” International Journal of Food Science and Technology, vol. 45, pp. 278–288, 2010.
M. Sojak and S. Głowacki, “Analysis of giant pumpkin (Cucurbita maxima) drying kinetics in various technologies of convective drying,” Journal of Food Engineering, vol. 99, pp. 323– 329, 2010.
A. Brasiello, G. Adiletta, P. Russo, S. Crescitelli, D. Albanese, and M. D. Matteo, “Mathematical modeling of eggplant drying: Shrinkage effect,” Journal of Food Engineering, vol. 114, pp. 99– 105, 2013.
I. Doymaz, “Drying of thyme (Thymus vulgaris L.) and selection of a suitable thin‐layer drying model,” Journal of Food Processing and Preservation, vol. 35, pp. 458–465, 2011.
A. Silva, F. d. A. Almeida, E. Lima, F. Silva, and J. Gomes, “Drying kinetics of coriander (Coriandrum sativum) leaf and stem cinéticas de secado de hoja y tallo de cilantro (Coriandrum sativum),” CYTA-Journal of Food, vol. 6, pp. 13–19, 2008.
D. Arslan and M. M. Özcan, “Evaluation of drying methods with respect to drying kinetics, mineral content and colour characteristics of rosemary leaves,” Energy Conversion and Management, vol. 49. pp. 1258–1264. 2008.
M. Ibrahim, K. Sopian, and W. R. W. Daud, “Study of the drying kinetics of lemon grass,” American Journal of Applied Sciences, vol. 6, 2009, Art. no. 1070.
İ. Doymaz, “Effect of citric acid and blanching pre-treatments on drying and rehydration of Amasya red apples,” Food and Bioproducts Processing, vol. 88, pp. 124–132, 2010.
I. Sotome, M. Takenaka, S. Koseki, Y. Ogasawara, Y. Nadachi, H. Okadome, and S. Isobe, “Blanching of potato with superheated steam and hot water spray,” LWT-Food Science and Technology, vol. 42, pp. 1035–1040, 2009.
G. L. And and D. M. Barrett, “Influence of pre‐drying treatments on quality and safety of sun‐dried tomatoes. Part I: Use of steam blanching, boiling brine blanching, and dips in salt or sodium metabisulfite,” Journal of Food Science, vol. 71, pp. S24–S31, 2006.
Y. C. Chung, B. H. Chiang, J. H. Wei, C. K. Wang, P. C. Chen, and C. K. Hsu, “Effects of blanching, drying and extraction processes on the antioxidant activity of yam (Dioscorea alata),” International Journal of Food Science & Technology, vol. 43, pp. 859–864, 2008.
H. W. Xiao, X. D. Yao, H. Lin, W. X. Yang, J. S. Meng, and Z. J. Gao, “Effect of SSB (superheated steam blanching) time and drying temperature on hot air impingement drying kinetics and quality attributes of yam slices,” Journal of Food Process Engineering, vol. 35, pp. 370–390, 2012.
I. Doymaz, “Influence of blanching and slice thickness on drying characteristics of leek slices,” Chemical Engineering and Processing: Process Intensification, vol. 47, pp. 41–47, 2008.
M. González-Fésler, D. Salvatori, P. Gómez, and S. Alzamora, “Convective air drying of apples as affected by blanching and calcium impregnation,” Journal of Food Engineering, vol. 87, pp. 323–332, 2008.
M. E. Heras-Ramírez, A. Quintero-Ramos, A. A. Camacho-Dávila, J. Barnard, R. Talamás- Abbud, J. V. Torres-Muñoz, and E. Salas-Muñoz, “Effect of blanching and drying temperature on polyphenolic compound stability and antioxidant capacity of apple pomace,” Food and Bioprocess Technology, vol. 5, pp. 2201–2210, 2012.
V. Maharaj and C. K. Sankat, “Quality changes in dehydrated dasheen leaves: Effects of blanching pre-treatments and drying conditions,” Food Research International, vol. 29, pp. 563–568, 1996.
O. Yaldiz, C. Ertekin, and H. I. Uzun, “Mathematical modeling of thin layer solar drying of sultana grapes,” Energy, vol. 26, pp. 457–465, 2001.
A. Babu, G. Kumaresan, V. A. A. Raj, and R. Velraj, “Review of leaf drying: Mechanism and influencing parameters, drying methods, nutrient preservation, and mathematical models,” Renewable and Sustainable Energy Reviews, vol. 90, pp. 536– 556, 2018.
S. Erenturk, M. Gulaboglu, and S. Gultekin, “The thin-layer drying characteristics of rosehip,” Biosystems Engineering, vol. 89, pp. 159–166, 2004.
M. Özdemir and Y. O. Devres, “The thin layer drying characteristics of hazelnuts during roasting,” Journal of Food Engineering, vol. 42, pp. 225–233, 1999.
V. Demir, T. Gunhan, A. Yagcioglu, and A. Degirmencioglu, “Mathematical modeling and the determination of some quality parameters of air-dried bay leaves,” Biosystems Engineering, vol. 88, pp. 325–335, 2004.
R. Goyal, A. Kingsly, M. Manikantan, and S. Ilyas, “Mathematical modeling of thin layer drying kinetics of plum in a tunnel dryer,” Journal of Food Engineering, vol. 79, pp. 176–180, 2007.
J. Crank, The Mathematics of Diffusion. Oxford, UK: Clarendon, 1975.
N. A. Akgun and I. Doymaz, “Modeling of olive cake thin-layer drying process,” Journal of Food Engineering, vol. 68, pp. 455–461, 2005.
M. Peleg, “An empirical model for the description of moisture sorption curves,” Journal of Food Science, vol. 53, pp. 1216–1217, 1988.
I. Doymaz, “Convective air drying characteristics of thin layer carrots,” Journal of Food Engineering, vol. 61, pp. 359–364, 2004.
A. Nieto, D. Salvatori, M. Castro, and S. Alzamora, “Air drying behaviour of apples as affected by blanching and glucose impregnation,” Journal of Food Engineering, vol. 36, pp. 63–79, 1998.
H. S. Kusuma, D. K. Y. Putri, I. Triesty, and M. Mahfud, “Comparison of microwave hydrodistillation and solvent-free microwave extraction for extraction of agarwood oil,” Chiang Mai Journal of Science, vol. 46, pp. 741– 755, 2019.
H. S. Kusuma and M. Mahfud, “The extraction of essential oils from patchouli leaves (Pogostemon cablin Benth) using a microwave air-hydrodistillation method as a new green technique,” RSC Advances, vol. 7, pp. 1336–1347, 2017.
D. Wang, J. W. Dai, H. Y. Ju, L. Xie, H. W. Xiao, Y. H. Liu, and Z. J. Gao, “Drying kinetics of American ginseng slices in thin-layer air impingement dryer,” International Journal of Food Engineering, vol. 11, pp. 701–711, 2015.
J. Ahmed, U. Shivhare, and G. Singh, “Drying characteristics and product quality of coriander leaves,” Food and Bioproducts Processing, vol. 79, pp. 103–106, 2001.
D. Kadam, R. Goyal, and M. Gupta, “Mathematical modeling of convective thin layer drying of basil leaves,” Journal of Medicinal Plants Research, vol. 5, pp. 4721–4730, 2011.
İ. Doymaz, N. Tugrul, and M. Pala, “Drying characteristics of dill and parsley leaves,” Journal of Food Engineering, vol. 77, pp. 559–565, 2006.
P. Panchariya, D. Popovic, and A. Sharma, “Thin-layer modeling of black tea drying process,” Journal of Food Engineering, vol. 52, pp. 349–357, 2002.
S. Balasubramanian, R. Sharma, R. Gupta, and R. Patil, “Validation of drying models and rehydration characteristics of betel (Piper betel L.) leaves,” Journal of Food Science and Technology, vol. 48, pp. 685–691, 2011.
M. Beigi, “Thin layer drying of wormwood (Artemisia absinthium L.) leaves: Dehydration characteristics, rehydration capacity and energy consumption,” Heat and Mass Transfer, vol. 53, pp. 2711–2718, 2017.
S. Mujaffar and A. L. Loy, “The rehydration behavior of microwave‐dried amaranth (Amaranthus dubius) leaves,” Food Science & Nutrition, vol. 5, pp. 399–406, 2017.
M. Turhan, S. Sayar, and S. Gunasekaran, “Application of Peleg model to study water absorption in chickpea during soaking,” Journal of Food Engineering, vol. 53, pp. 153–159, 2002.
V. Maharaj and C. Sankat, “Rehydration characteristics and quality of dehydrated dasheen leaves,” Canadian Agricultural Engineering, vol. 42, pp. 81–85, 2000.
G. Dadali, E. Demirhan, and B. Özbek, “Effect of drying conditions on rehydration kinetics of microwave dried spinach,” Food and Bioproducts Processing, vol. 86, pp. 235–241, 2008.
E. Demirhan and B. Özbek, “Rehydration kinetics of microwave‐dried basil,” Journal of Food Processing and Preservation, vol. 34, pp. 664– 680, 2010.
L. C. Okpala and C. A. Ekechi, “Rehydration characteristics of dehydrated West African pepper (Piper guineense) leaves,” Food Science and Nutrition, vol. 2, pp. 664–668, 2014.
N. Abu-Ghannam and B. McKenna, “The application of Peleg's equation to model water absorption during the soaking of red kidney beans (Phaseolus vulgaris L.),” Journal of Food Engineering, vol. 32, pp. 391–401, 1997.
N. Therdthai and W. Zhou, “Characterization of microwave vacuum drying and hot air drying of mint leaves (Mentha cordifolia Opiz ex Fresen),” Journal of Food Engineering, vol. 91, pp. 482– 489, 2009.
T. Phahom, S. Phoungchandang, and W. L. Kerr, “Effects of steam‐microwave blanching and different drying processes on drying characteristics and quality attributes of Thunbergia laurifolia Linn. leaves,” Journal of the Science of Food and Agriculture, vol. 97, pp. 3211–3219, 2017.
H. Karunasena, P. Hesami, W. Senadeera, Y. Gu, R. J. Brown, and A. Oloyede, “Scanning electron microscopic study of microstructure of gala apples during hot air drying,” Drying Technology, vol. 32, pp. 455–468, 2014.