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Article

Multi-Index Analysis and Comprehensive Evaluation of Different Drying Techniques for Citrus Peels Based on Entropy Weight Method

School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
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Author to whom correspondence should be addressed.
Agriculture 2025, 15(23), 2433; https://doi.org/10.3390/agriculture15232433
Submission received: 17 October 2025 / Revised: 21 November 2025 / Accepted: 24 November 2025 / Published: 25 November 2025
(This article belongs to the Section Agricultural Technology)

Abstract

This study examined the effects of hot-air drying (HAD), infrared drying (IRD), and microwave-infrared combined drying (MICD) on the drying characteristics and quality of citrus peels. Increasing temperature and microwave power significantly shortened drying time, with MICD showing the highest efficiency due to its volumetric heating mechanism. MICD also exhibited the highest effective moisture diffusivity and lowest activation energy, indicating enhanced moisture migration, but caused structural collapse and color deterioration. In contrast, HAD and IRD better preserved color and oil gland integrity. Under optimal conditions, MICD and IRD retained higher total phenolic and flavonoid contents, accompanied by superior antioxidant activity. Electronic nose and PCA analyses revealed better volatile flavor retention in HAD and IRD, while microstructural observations showed that IRD produced more uniform and intact tissues. Correlation analysis indicated strong associations among color, flavor retention, and antioxidant activity. The entropy-weight comprehensive evaluation identified IRD at 70 °C as the optimal drying method, balancing efficiency, bioactive compound preservation, and flavor quality. These findings provide practical guidance for selecting energy-efficient drying technologies to enhance the quality of dried citrus peels.
Keywords: citrus peels drying; drying methods; drying kinetics; bioactive compounds; multi-index evaluation; entropy weight method citrus peels drying; drying methods; drying kinetics; bioactive compounds; multi-index evaluation; entropy weight method

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MDPI and ACS Style

Zhu, Y.; Tian, X.; Wang, C.; Cai, J.; Feng, Z.; Zhu, J.; Bai, J. Multi-Index Analysis and Comprehensive Evaluation of Different Drying Techniques for Citrus Peels Based on Entropy Weight Method. Agriculture 2025, 15, 2433. https://doi.org/10.3390/agriculture15232433

AMA Style

Zhu Y, Tian X, Wang C, Cai J, Feng Z, Zhu J, Bai J. Multi-Index Analysis and Comprehensive Evaluation of Different Drying Techniques for Citrus Peels Based on Entropy Weight Method. Agriculture. 2025; 15(23):2433. https://doi.org/10.3390/agriculture15232433

Chicago/Turabian Style

Zhu, Yutong, Xiaoyu Tian, Chen Wang, Jianrong Cai, Zhenwei Feng, Jingke Zhu, and Junwen Bai. 2025. "Multi-Index Analysis and Comprehensive Evaluation of Different Drying Techniques for Citrus Peels Based on Entropy Weight Method" Agriculture 15, no. 23: 2433. https://doi.org/10.3390/agriculture15232433

APA Style

Zhu, Y., Tian, X., Wang, C., Cai, J., Feng, Z., Zhu, J., & Bai, J. (2025). Multi-Index Analysis and Comprehensive Evaluation of Different Drying Techniques for Citrus Peels Based on Entropy Weight Method. Agriculture, 15(23), 2433. https://doi.org/10.3390/agriculture15232433

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