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[交流] 炮制中药饮片中累黑素(美拉德反应产物)的提取和测定

请教一个问题:炮制程度越强的样品提取物(用大极性溶剂提取),褐化程度明显加强、颜色明显加深,但是过滤后的滤液颜色与提取物的不一致,炒焦样品的紫外吸光度值比比炒制样品低(在380nm以上的最大吸收波长下测定),这是什么原因呢?

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