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Appearance, Microstructure, and Bioactive Components of Bletilla striata Tuber as Affected by Different Drying Methods

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Abstract

Bletilla striata is widely used as healthy food and herbal medicine for its hemostasis, anti-ulcer, promoting wound healing, antibacterial, anti-inflammatory, and immune regulatory functions. Drying methods affect the quality of herbal medicine, including appearance and more importantly the content of active components, which play a decisive role in the medical and tonic functions. In this study, hot air drying (HD), infrared drying (ID), microwave drying (MD), vacuum drying (VD), and freeze drying (FD) were used to evaluate the effect of drying methods on the quality of B. striata tubers. Significant effects of drying methods on the appearance, color, microstructure, water activity, water content, and active component content of B. striata tubers were observed. FD-treated samples retained the majority of the appearance, color, and microstructure, while samples processed with other methods exhibiting various deformation and discoloration. In addition, a significant decline in water content and water activity was detected in FD-treated samples, yet, the content of active components, such as B. striata polysaccharides, total polyphenols, and militarine, was relatively high. After comprehensive comparison, freeze-drying is proposed to be the most suitable method for B. striata drying, which is also recommendable for other tuber drying.

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Acknowledgements

Thanks to Jie Wang, Hailing Fang, and Tingting Han for their help in collecting samples.

Funding

This work was supported by Major Science and Technology Projects of Breeding New Varieties of Agriculture in Zhejiang Province (2016C02058).

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  1. Lihong Li and Man Zhang contributed equally to this work and should be considered co-first authors.

  2. Ding Lin and Ying Zheng contributed equally to this work and should be considered co-corresponding authors.

Authors and Affiliations

  1. State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, 311300, China

    Lihong Li, Man Zhang, Chenfei Lu, Sirui Xu, Ding Lin & Ying Zheng

  2. Qingyuan County Qianning Daodi Medicinal Materials Co., Ltd., Lishui, 323800, China

    Zhongdong Fu

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  1. Lihong Li
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Lihong Li and Man Zhang researched the relevant literature and wrote the body of the article. Chenfei Lu edited the article. Zhongdong Fu and Sirui Xu provided some suggestions and edited the article. Ding Lin provided overall direction for the program work programme. Ying Zheng provided some suggestions and edited the final version of the article.

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Li, L., Zhang, M., Lu, C. et al. Appearance, Microstructure, and Bioactive Components of Bletilla striata Tuber as Affected by Different Drying Methods. Food Bioprocess Technol (2024). https://doi.org/10.1007/s11947-024-03348-6

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