【摘要】 针对荷叶中黄酮类物质含量较低及其生物活性不足的问题，提出了采用冠突散囊菌(Eurotium cristatum)进行粉末液体发酵的方法，并通过正交试验优化了发酵工艺参数。优化后的最佳发酵条件为：发酵时间7 d、菌浓度1×10~7 CFU/mL、初始pH 5、蔗糖浓度4%。研究结果表明，冠突散囊菌发酵能够显著提高荷叶中黄酮类物质的含量，从2.03%提升至2.58%,增幅达27.09%。此外，发酵后黄酮提取物表现出显著的抗氧化活性，尤其在DPPH·、ABTS~+·自由基清除能力上优于未发酵组。此研究为荷叶资源的高值化利用提供了理论依据和技术支持，对推动荷叶相关功能性产品的开发具有重要意义。更多还原

【Abstract】 Lotus leaf（Nelumbo nucifera Gaertn.） is recognized as both a medicinal and an edible plant, rich in flavonoids which possess antioxidant and hypoglycemic activities. However, its native flavonoid content is relatively low, and conventional extraction methods suffer from low yield and weak activity. In this study, Eurotium cristatum was employed to ferment lotus leaf via powder-liquid fermentation. Orthogonal L9（3⁴） experiments were designed to optimize fermentation parameters. The optimal conditions were established as follows: fermentation time 7 days, inoculum concentration 1×10⁷ CFU/mL, initial pH 5, and sucrose concentration 4%. Under these conditions, the flavonoid content increased from 2.03%（unfermented） to 2.58%（fermented）, representing a 27.09% enhancement. In vitro antioxidant assays（DPPH· and ABTS⁺·） revealed that fermented extracts exhibited significantly higher radical-scavenging capacity compared to unfermented samples. The IC₅₀ values of fermented flavonoid extracts for ABTS and DPPH were 0.271 mg/mL and 0.676 mg/mL, respectively（P < 0.05）. These findings indicate that E. cristatum fermentation effectively enhances flavonoid content and antioxidant activity, providing a viable strategy for the high-value utilization of lotus leaf.更多还原