Abstract
Hot-air drying (HAD) of Tremella fuciformis often results in poor rehydration capacity, yellowing, and long preparation times, which significantly reduce its industrial and consumer value. This study introduces a heat-integrated pretreatment (HIP) as a simple and viable strategy to improve the quality of dried T. fuciformis. The effects of HIP on water status, microstructure, and rheological behavior were systematically investigated via using low-field nuclear magnetic resonance (LF-NMR), magnetic resonance imaging (MRI), scanning electron microscopy (SEM), and rheological analysis. HIP effectively regulated water migration and preserved the polysaccharide matrix, which promots a controllable conversion of bound water to free water, thus facilitating more uniform dehydration. Among the tested conditions, HIP at 80 °C for 5 min increased the rehydration capacity by 74% compared with conventional HAD, while maintaining structural integrity and polysaccharide content. The treated samples exhibited brighter appearance, improved gelation behavior, and superior rehydration performance. These findings elucidate the mechanism by which HIP modulates polysaccharide–water interactions during drying and demonstrate its strong potential for manufacturing high-quality, quick-soak dried T. fuciformis products with enhanced physicochemical and structural properties.
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The datasets generated and analyzed during the current study are not publicly available due to laboratory data management regulations but are available from the corresponding author on reasonable request.
References
Wu, Y. et al. Structure, bioactivities and applications of the polysaccharides from tremella fuciformis mushroom: a review. Int. J. Biol. Macromol. 121, 1005–1010 (2019).
Yang, D., Liu, Y. & Zhang, L. Tremella polysaccharide: the molecular mechanisms of its drug action. Prog. Molec. Biol. Transl. Sci. 163, 383–421 (2019).
Li, S. et al. Recent advances in polysaccharides from Tremella fuciformis: isolation, structures, bioactivities and application. Front. Nutr. 12, 1663327 (2025).
Sun, Y. & Syahariza, Z. A. Extraction, structure, biological activities of polysaccharides from Tremella fuciformis: a review. J. Funct. Foods. 133, 107012 (2025).
Yuan, Q. et al. Glycosidic linkages of fungus polysaccharides influence the anti-inflammatory activity in mice. J. Adv. Res. 67, 161–172 (2025).
Yang, Y. et al. Association between intake of edible mushrooms and algae and the risk of cognitive impairment in Chinese older adults. Nutrients. 16, 637 (2024).
Zhang, Z., Chen, Z., Zhang, C. & Kang, W. Physicochemical properties and biological activities of tremella hydrocolloids. Food Chem. 407, 135164 (2023).
Wu, D. et al. In vitro fecal fermentation properties of polysaccharides from Tremella fuciformis and related modulation effects on gut microbiota. Food Res. Int. 156, 111185 (2022).
Marelli, F., Pontoriero, D., Antonini, C. & Tagliaro, I. Water-polysaccharide interactions and their properties in freezing conditions. Carbohydr. Polym. 368, 124138 (2025).
Cao, Y. et al. Effect of ultrasound pretreatment on the drying characteristics and quality of Tremella fuciformis under heat pump drying. Ultrason. Sonochem. 121, 107553 (2025).
Lin, Y. et al. Application of curcumin-mediated antibacterial photodynamic technology for preservation of fresh Tremella fuciformis. Lwt. 147, 111657 (2021).
Lin, C. & Tsai, S. Differences in the moisture capacity and thermal stability of tremella fuciformis polysaccharides obtained by various drying processes. Molecules. 24, 2856 (2019).
Giri, S. K. & Prasad, S. Drying kinetics and rehydration characteristics of microwave-vacuum and convective hot-air dried mushrooms. J. Food Eng. 78, 512–521 (2007).
Li, J., Huang, Y., Gao, M., Tie, J. & Wang, G. Shrinkage properties of porous materials during drying: a review. Front. Mater. 11, 1330599 (2024).
Lewicki, P. P. Effect of pre-drying treatment, drying and rehydration on plant tissue properties: a review. Int. J. Food Prop. 1, 1–22 (1998).
Wang, Q. et al. Effects of drying on the structural characteristics and antioxidant activities of polysaccharides from Stropharia rugosoannulata. J. Food Sci. Technol. 58, 3622–3631 (2021).
Zhong, L. et al. Improving of the drying characteristics, moisture migration and quality attributes by ultrasound pretreatment for convective dried stropharia rugosoannulata slices. Food Res. Int. 211, 116465 (2025).
Zhang, Z. et al. Low intensity ultrasound as a pretreatment to drying of daylilies: impact on enzyme inactivation, color changes and nutrition quality parameters. Ultrason. Sonochem. 36, 50–58 (2017).
Grzegorzewska, M. et al. The effect of hot water treatment on the storage ability improvement of fresh-cut Chinese cabbage. Sci. Hortic. 291, 110551 (2022).
Sgroppo, S. C. & Pereyra, M. V. Using mild heat treatment to improve the bioactive related compounds on fresh-cut green bell peppers. Int. J. Food Sci. Technol. 44, 1793–1801 (2009).
Ben Zid, M. et al. Effects of blanching on flavanones and microstructure of citrus aurantium peels. Food Bioprocess Technol. 8, 2246–2255 (2015).
Lespinard, A. R., Goñi, S. M., Salgado, P. R. & Mascheroni, R. H. Experimental determination and modelling of size variation, heat transfer and quality indexes during mushroom blanching. J. Food Eng. 92, 8–17 (2009).
Ling, B., Tang, J., Kong, F., Mitcham, E. J. & Wang, S. Kinetics of food quality changes during thermal processing: a review. Food Bioprocess Technol. 8, 343–358 (2014).
Nisha, P., Singhal, R. S. & Pandit, A. B. Kinetic modelling of texture development in potato cubes (Solanum tuberosum L.), Green gram whole (Vigna radiate L.) And red gram splits (Cajanus cajan L.). J. Food Eng. 76, 524–530 (2006).
Eblaghi, M., Bronlund, J. E., Yedro, F. M. & Archer, R. H. Kinetics of pectin reactions in apple pomace during hydrothermal treatment. Food Bioprocess Technol. 14, 739–750 (2021).
Hills, B. P. In Annual Reports on NMR Spectroscopy, 177–230 (Elsevier, 2006).
Bertram, H. C., Dønstrup, S., Karlsson, A. H. & Andersen, H. J. Continuous distribution analysis of t2 relaxation in meat—an approach in the determination of water-holding capacity. Meat Sci. 60, 279–285 (2002).
Zheng, Z. et al. Effects of different blanching methods on the quality of Tremella fuciformis and its moisture migration characteristics. Foods. 12, 1669 (2023).
Gilbert, A. & Turgeon, S. L. Unraveling microstructure and water behavior in diverse food matrices using low-frequency NMR (LF-NMR) on proton: a specific look at 1h-LF-NMR results interpretation. Food Hydrocoll. 172, 111974 (2026).
Dhahri, M. et al. The isolation, bioactivity, and role of ß-glucans in health: a review. Int. J. Biol. Macromol. 330, 148000 (2025).
Adiletta, G. et al. Moisture migration by magnetic resonance imaging during eggplant drying: a preliminary study. Int. J. Food Sci. Technol. 49, 2602–2609 (2014).
Lian, F., Cheng, J., Ma, J. & Sun, D. LF-NMR and MRI analyses of water status and distribution in pork patties during combined roasting with steam cooking. Food Biosci. 56, 103325 (2023).
Iijima, M., Ma, S., Asano-Oritani, M. & Hatakeyama, T. Thermal studies on tremella fuciformis polysaccharide-water interaction. Thermochim. Acta. 732, 179657 (2024).
Xiao, H. et al. Recent developments and trends in thermal blanching – a comprehensive review. Inform. Process. Agric. 4, 101–127 (2017).
Wang, J. et al. Effects of various blanching methods on weight loss, enzymes inactivation, phytochemical contents, antioxidant capacity, ultrastructure and drying kinetics of red bell pepper (Capsicum annuum L.). Lwt. 77, 337–347 (2017).
Simpson, R., Ramírez, C., Nuñez, H., Jaques, A. & Almonacid, S. Understanding the success of page’s model and related empirical equations in fitting experimental data of diffusion phenomena in food matrices. Trends Food Sci. Technol. 62, 194–201 (2017).
Li, Y., Li, J. & Fan, L. Effects of combined drying methods on physicochemical and rheological properties of instant tremella fuciformis soup. Food Chem. 396, 133644 (2022).
çakmak, R. Ş, Tekeoğlu, O., Bozkır, H., Ergün, A. R. & Baysal, T. Effects of electrical and sonication pretreatments on the drying rate and quality of mushrooms. LWT Food Sci. Technol. 69, 197–202 (2016).
Chitrakar, B., Zhang, M. & Adhikari, B. Dehydrated foods: are they microbiologically safe? Crit. Rev. Food. Sci. Nutr. 59, 2734–2745 (2019).
Xu, J. et al. Effects of combined ultrasonic and microwave vacuum drying on drying characteristics and physicochemical properties of tremella fuciformis. Ultrason. Sonochem. 84, 105963 (2022).
Ma, F. et al. Characterisation of the mucilage polysaccharides from Dioscorea opposita Thunb. With enzymatic hydrolysis. Food Chem. 245, 13–21 (2018).
Srivastava, B., Singh, K. P. & Zimik, W. Effects of blanching methods on drying kinetics of oyster mushroom. Int. J. Food Eng. 5, 7 (2009).
Diamante, L. M., Ihns, R., Savage, G. P. & Vanhanen, L. Short communication: a new mathematical model for thin layer drying of fruits. Int. J. Food Sci. Technol. 45, 1956–1962 (2010).
Shi, S. et al. Changes in water absorption and morphology of rice with different eating quality during soaking. Eur. Food Res. Technol. 249, 759–766 (2022).
Li, C. et al. A pectin-based active coating for preservation of fresh-cut apples: incorporated with luteolin and ε-polylysine for enhanced performance. Foods. 15, 63 (2025).
Geng, Y. et al. The modulatory effects of shiitake mushrooms on the quality and flavor profiles of steamed low-salt chicken meatballs. Int. J. Gastron. Food Sci. 40, 101190 (2025).
Peng, J. et al. Characteristics of cell wall pectic polysaccharides affect textural properties of instant controlled pressure drop dried carrot chips derived from different tissue zone. Food Chem. 293, 358–367 (2019).
Deng, L. et al. High-humidity hot air impingement blanching (HHAIB) enhances drying quality of apricots by inactivating the enzymes, reducing drying time and altering cellular structure. Food Control. 96, 104–111 (2019).
de Moraes, J. O. et al. Mechanical-acoustical measurements to assess the crispness of dehydrated bananas at different water activities. Lwt 154, 112822 (2022).
Wang, W. et al. Characterization of pectin from grapefruit peel: a comparison of ultrasound-assisted and conventional heating extractions. Food Hydrocoll. 61, 730–739 (2016).
Acknowledgements
This research was supported by University-Industry Cooperation Project of Fujian Province (2024N5002) and China and Fujian College Association Instrumental Analysis Center of Fuzhou University Testing Fund of Precious Apparatus (2025T033,2026T047).
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Yuanhui Zhang: Writing—original draft, Investigation, Data curation. Nengpai Shi: Writing—review & editing, Investigation. Cong Yang: Methodology, Investigation. Yuankun Jia: Methodology, Investigation. Jiaxuan Peng: Writing—review & editing, Methodology. Xuemei Hou: Writing—review & editing, Resources. Shengnan Lin: Writing—review & editing, Methodology, Supervision, Formal analysis. Xiangyang Lin: Writing—review & editing, Supervision, Funding acquisition.
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Zhang, Y., Shi, N., Yang, C. et al. Beyond conventional drying: improving the quality of dried Tremella fuciformis via a heat-integrated pretreatment. npj Sci Food (2026). https://doi.org/10.1038/s41538-026-00805-8
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DOI: https://doi.org/10.1038/s41538-026-00805-8
