Determination of the drying kinetics and energy efficiency of purple basil (Ocimum basilicum L.) leaves using different drying methods
- 23 Downloads
In this work, the effects of different drying methods, namely sun, freeze, convective and microwave oven drying on the drying time, rate and kinetics were investigated in purple basil leaves. Additionally, the energy efficiencies of the driers were determined. All the drying processes took place mainly in the falling-rate period. Comparatively, higher drying rates were obtained from microwave oven drying of the samples. Eleven thin-layer drying models, (Lewis, Page, Modified Page I, Henderson and Pabis, Modified Henderson and Pabis, Logarithmic, Midilli, Modified Midilli, Two-Term, Two-Term Exponential, and Wang and Singh) were fitted to the experimental moisture ratio data. Handerson and Pabis for freeze drying, logarithmic for sun drying and Page for convective and microwave oven drying were found to be the best models for explaining the drying behavior of the purple basil leaves with the highest R2 and lowest RMSE values. The effective moisture diffusivity (Deff) values of the dried purple basil leaves were calculated with Fick’s diffusion model and ranged from 1.62 × 10−9 to 7.09 × 10−8 m2/s. The energy efficiency of microwave oven drying was higher than the other methods.
This study was supported by Republic of Turkey, Ministry of Food Agriculture and Livestock (Project no: TAGEM Ar-Ge/16-61).
- 13.Kadam DM, Goyal RK, Gupta MK (2011a) Mathematical modeling of convective thin layer drying of basil leaves. J Med Plant Res 5(19):4721–4730Google Scholar
- 17.Gurkan H, Hayaloglu AA (2017) Volatiles and sensory characteristics of yogurt manufactured by incorporating basil (Ocimum basilicum L.). Int J Food Prop 73:1–11Google Scholar
- 20.Kadam DM, Goyal RK, Singh KK, Gupta MK (2011b) Thin layer convective drying of mint leaves. J Med Plant Res 5(2):164–170Google Scholar
- 21.AOAC, Official Methods of Analysis (2000) Association of Official Analytical Chemists, 17th edn. Microwave drying, GaithersburgGoogle Scholar
- 27.Polatci H (2008) The effects of various drying methods on the drying time and quality of basil (Ocimum basilicum), M.S. Thesis, Gaziosmanpaşa University, Graduate School of Natural and Applied Sciences (In Turkish)Google Scholar
- 36.Zarein M, Samadi SH, Ghobadian B (2015) Investigation of microwave dryer effect on energy efficiency during drying of apple slices. J Saudi Soc Agric Sci 14(1):41–47Google Scholar
- 41.Motevali A, Minaei S, Banakar A, Ghobadian B, Darvish H (2016) Energy analysis and drying of chamomile leaves in microwave –convective dryer. J Saudi Soc Agric Sci 15:179–187Google Scholar
- 43.Baysal T, Ozbalta N, Gokbulut S, Capar B, Tastan O, Gurlek G (2015) Investigation of effects of various drying methods on the quality characteristics of apple slices and energy efficiency. J Therm Sci Technol 35(1):135–144Google Scholar