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采用石油醚∶丙酮(7∶3)混合液为提取剂,用薄层层析—分光光度法测定杜仲叶中的β—胡萝卜素的含量,并对该法的精密度、准确性以及稳定性进行了探讨 在波长450nm下,其回归方程为A=0 492000C-0 00330,R=0.998,ε=1 2×105
The content of β-carotene in Eucommia ulmoides leaves was determined by thin-layer chromatography-spectrophotometry with the mixture of petroleum ether and acetone (7: 3) as extractant. The precision, accuracy and stability The regression equation of A = 0 492000C-0 00330, R = 0.998, ε = 1 2 × 105