{"_":"Pre-treatments modulate drying characteristics, moisture removals, pigments and browning substrates, flavor, and microstructure in hot air dried daylily ().","i":["Hemerocallis citrina"]}
黄花菜热风干燥（HAD）常导致干燥时间过长、严重褐变、色素降解及秋水仙碱残留不可接受，从而损害其安全性和市场价值。选择合适的预处理是减轻这些品质损失并提高干燥效率的关键。本研究系统比较了五种预处理——热水烫漂（HWB）、蒸汽烫漂（SB）、护色液浸泡（CP）、减毒碱性溶液浸泡（RT）以及热水烫漂联合超声处理（UT）——在干燥特性、水分去除、色泽、生物活性成分、安全性、微观结构和风味方面的差异。UT和CP实现了最短的干燥时间（5 h），而HWB和SB为6 h，RT和CK为8 h。核磁共振（NMR）显示，UT加速了自由水的去除，这解释了其最快的干燥速率。CP表现出多功能优势，既能保持鲜艳色泽、叶绿素和类胡萝卜素，又能抑制褐变、减少5-羟甲基糠醛的形成并保留多酚。此外，五种预处理均能显著降低秋水仙碱含量。UT保持了微观结构，但导致叶绿素过度保留，产生不理想的绿色色调，偏离了商业金黄色标准。综合考虑整体品质、安全性和市场可接受性，推荐CP作为黄花菜工业热风干燥的最佳预处理，而UT仅应在采取额外脱绿措施的情况下使用。这些研究结果为选择兼顾干燥效率与最终产品品质的预处理策略提供了科学依据。
Hot air drying (HAD) of daylilies frequently results in prolonged drying. Severe browning, pigment degradation, and unacceptable colchicine retention, compromising both safety and market value. Selecting an appropriate pretreatment is key to mitigating these quality losses while enhancing drying efficiency. The study systematically compared five pretreatments-hot water blanching (HWB), steam blanching (SB), immersion in color-preserving solution (CP), immersion in alkaline solution for reducing toxicity (RT), and hot water blanching combined with ultrasonic treatment (UT)-in terms of drying characteristics, moisture removal, color, bioactive components, safety, microstructure, and flavor. UT and CP achieved the shortest drying time (5 h), vs. 6 h for HWB and SB, and 8h for RT and CK. NMR revealed that UT accelerated the removal of free water, accounting for its fastest drying rate. CP exhibited multifunctional superiority, which preserved bright color, chlorophyll and carotenoids, while also inhibiting browning, reducing 5-hydroxymethylfurfuralformation, and retaining polyphenols. In addition, all five pretreatments can significantly reduce the colchicine content. UT preserved microstructure but caused excessive chlorophyll retention, resulting in an undesirable greenish hue that deviates from the commercial golden-yellow standard. Considering overall quality, safety, and market acceptability, CP is recommended as the optimal pretreatment for industrial HAD of daylily, whereas UT should be applied only with additional de-greening measures. These findings provided a scientific basis for selecting pretreatment strategies that balance drying efficiency with final product quality.
Yongkang Xie, Junjun Geng, Xuanxuan Yang, Yan Zhao, Liuyan Wang. {"_":"Pre-treatments modulate drying characteristics, moisture removals, pigments and browning substrates, flavor, and microstructure in hot air dried daylily ().","i":["Hemerocallis citrina"]}. Frontiers in nutrition. 2026; doi:10.3389/fnut.2026.1896965.
Yongkang Xie, Junjun Geng, Xuanxuan Yang, Yan Zhao, Liuyan Wang (2026). {"_":"Pre-treatments modulate drying characteristics, moisture removals, pigments and browning substrates, flavor, and microstructure in hot air dried daylily ().","i":["Hemerocallis citrina"]}. Frontiers in nutrition. https://doi.org/10.3389/fnut.2026.1896965
Yongkang Xie, Junjun Geng, Xuanxuan Yang, Yan Zhao, Liuyan Wang. {"_":"Pre-treatments modulate drying characteristics, moisture removals, pigments and browning substrates, flavor, and microstructure in hot air dried daylily ().","i":["Hemerocallis citrina"]}[J]. Frontiers in nutrition, 2026 doi:10.3389/fnut.2026.1896965.
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