【摘要】 系统比较了莲（Nelumbo nucifera）的荷叶与莲心中生物碱的成分差异及其抗氧化、降脂与抑菌特性。结果表明，荷叶中生物碱以阿朴啡类为主，其中荷叶碱含量最高；莲心则以双苄基异喹啉类为主，甲基莲心碱含量最高。在抗氧化与降脂活性方面，荷叶总生物碱表现出更强的DPPH自由基清除能力与胰脂肪酶抑制活性，且二者均呈浓度依赖性。抑菌试验显示，荷叶总生物碱对丁香假单胞菌（Pseudomonas syringae pv. tomato,DC3000）和莲链格孢菌（Alternaria nelumbii）均表现出更强且持久的抑制效果。稳定性分析显示，荷叶总生物碱的抑菌活性易受高温影响，而莲心总生物碱的热稳定性较高；金属离子Ca²⁺、Mg²⁺对2种生物碱的抑菌活性均有显著抑制作用，且对莲心总生物碱的影响更明显。更多还原

【Abstract】 A systematic comparative study was conducted to investigate the compositional differences of alkaloids in lotus leaves and lotus plumules,along with their respective antioxidant,lipid-lowering,and antibacterial properties. The analysis revealed a distinct compositional profile:Alkaloids in lotus leaves were predominantly of the aporphine-type,with nuciferine（lotus leaf alkaloid）being the most abundant,while bisbenzylisoquinoline alkaloids were predominant in lotus plumules,with neferine（methyl lotus plumule alkaloid）having the highest content. Functionally,the total alkaloids from lotus leaves exhibited superior antioxidant and lipid-lowering activities,demonstrating stronger DPPH radical scavenging capacity and pancreatic lipase inhibition both in a concentration-dependent manner compared to the total alkaloids from plumule. In antibacterial assays,the leaf alkaloids also showed more potent and sustained efficacy against Pseudomonas syringae pv. tomato,DC3000 and Alternaria nelumbii. Stability assessments,however,indicated that the antibacterial activity of the leaf alkaloids was susceptible to high temperatures,in contrast to the higher thermal stability observed for the plumule alkaloids. Furthermore,the presence of metal ions(Ca²⁺and Mg²⁺)significantly suppressed the antibacterial activity of both alkaloid types,with a more pronounced inhibitory effect on the alkaloids derived from lotus plumules.更多还原