Ultrasonic Pretreatment With dl ‐Malic Acid–Water Media: An Innovative Strategy to Enhance Infrared‐Assisted Spouted Bed Drying Efficiency and Product Quality of Chinese Yam

作者：Linlin Li, Jing Liu, Hong Pan, Xinyu Wei, Weiwei Cao, Yihui Chen, Lifeng Pan, Xu Duan, Duo Li · 发表于：Journal of Food Science · 年份：2025 · DOI：10.1111/1750-3841.70668 · 被引用次数：1 · 研究领域：Food Drying and Modeling、Microencapsulation and Drying Processes、Granular flow and fluidized beds

This study employed ultrasound (US) pretreatment with different media-water (W), ethanol (EtOH), dl-malic acid aqueous solution (DLMA-W), and dl-malic acid ethanol solution (DLMA-EtOH)-on Chinese yam (Dioscorea opposita), with no US as control, to systematically investigate the effects of pretreatment methods on infrared-assisted spouted bed drying (IRSBD) characteristics and product quality. The results showed that all pretreatments reduced the drying time and specific energy consumption to varying degrees. However, only US + W and US + DLMA-W treatments significantly increased the moisture diffusion coefficient in IRSBD. Among all pretreatments, US + DLMA-W effectively enhanced water gain (which facilitated the opening of natural pores in the yam matrix) and reduced bound water content, resulting in a 40.07% reduction in drying time for IRSBD compared to control. The treated samples also exhibited the highest rehydration ratio (RR) (1.79 ± 0.03) and total phenol content (91.43 ± 7.84 mg GAE/100 g DW), as well as superior 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging capacity (35.58 ± 1.27 mg VCE/100 g DW). In contrast, EtOH-associated pretreatments (EtOH, DLMA-EtOH, US + EtOH) showed no significant improvement in RR, total phenolic content, or DPPH scavenging capacity compared to the control group (p > 0.05). Therefore, US + DLMA-W pretreatment emerges as the optimal approach, offering a promising solution for industrial-scale agricultural product drying that simultaneous...