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Effect of rotary microwave drying on quality characteristics and physical properties of Kaffir lime leaf (Citrus hystrix D.C.)

Abstract

Dried kaffir lime leaves are widely used in food preparation and medicine. Microwave has been developed as an efficient method for decreasing the drying exposure time and the quality improvement of the final product. Kaffir lime leaves were dried in a microwave rotary dryer for this study. Three distinct angles of inclination (30°, 45°, and 60°) and two different microwave power levels were used in the studies (1,000 and 2,000 W). The dried samples were evaluated for moisture content, color, shape, and antioxidant content. The best result was obtained at an inclination angle of 60° and a microwave power of 2,000 W, with a reduction in the moisture content from 1.75 ± 0.04 to 0.05 ± 0.02 g water/g dry solid after 2 h of treatment and antioxidant content of 4.65 ± 0.1 mg/mL. In addition, there was not a significant change in the shape and color compared with the fresh kaffir lime leaves. Finally, the mathematical model successfully predicted a parabolic model and effective moisture diffusion of 1.82 × 10–8 m2s−1. This investigation showed that the microwave rotary dryer prototype might be used to produce high-value products while maintaining the main characteristics.

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Data availability

The authors confirm that the data supporting this study's conclusions are included in the paper.

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Contributions

Thunvarat Pradechboon: Laboratory analysis, investigation, and writing (original draft preparation). Natthawud Dussadee: Laboratory support, resources, literature review, comparative studies, and revision. Yuwalee Unpaprom: Data analysis, conceptualization, visualization, methodology, and writing (reviewing and editing). Sirinuch Chindaraksa: Methodology, resources, supervision, visualization, and writing (reviewing and editing).

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Correspondence to Sirinuch Chindaraksa.

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Pradechboon, T., Dussadee, N., Unpaprom, Y. et al. Effect of rotary microwave drying on quality characteristics and physical properties of Kaffir lime leaf (Citrus hystrix D.C.). Biomass Conv. Bioref. (2022). https://doi.org/10.1007/s13399-022-02722-8

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  • DOI: https://doi.org/10.1007/s13399-022-02722-8

Keywords

  • Rotary microwave dryer
  • Kaffir lime leaf
  • Distinct angles
  • Mathematical model