【单选题】【消耗次数：1】
食物用明火烧烤的时间越长，表面所含的（）就越多。
①
苯并芘
②
动物胶
③
二秋水仙碱
④
生物碱
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关于生物碱的理化性质，下列说法错误的是
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大多生物碱难溶于水，易溶于氯仿、乙醚等有机溶剂
②
与酸结合后水溶性增加
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