單項(xiàng)選擇題pH梯度萃取7,4′-二OH黃酮應(yīng)選用()

A.5%NaHCO3
B.5%Na2CO3
C.0.2%NaOH
D.4%NaOH
E.5%HCl


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1.單項(xiàng)選擇題pH梯度萃取4′-OH黃酮應(yīng)選用()

A.5%NaHCO3
B.5%Na2CO3
C.0.2%NaOH
D.4%NaOH
E.5%HCl

2.單項(xiàng)選擇題pH梯度萃取7-OH黃酮應(yīng)選用()

A.5%NaHCO3
B.5%Na2CO3
C.0.2%NaOH
D.4%NaOH
E.5%HCl

3.單項(xiàng)選擇題pH梯度萃取6-OH黃酮應(yīng)選用()

A.5%NaHCO3
B.5%Na2CO3
C.0.2%NaOH
D.4%NaOH
E.5%HCl

4.單項(xiàng)選擇題pH梯度萃取5-OH黃酮應(yīng)選用()

A.5%NaHCO3
B.5%Na2CO3
C.0.2%NaOH
D.4%NaOH
E.5%HCl

5.單項(xiàng)選擇題不能與鄰二酚羥基反應(yīng)的試劑是()

A.三氯化鋁
B.二氯氧鋯
C.中性醋酸鉛
D.堿式醋酸鉛
E.氨性氯化鍶