目的:砓span style="background: rgb(255, 255, 255); line-height: 150%; font-family: 宋体;">穵/span>测定虎杖中大黄素的含量;虎杖属于蓼科虎杖属植物,干燥的根具有祛风利湿散瘀定痛止咳化痰功效,是传统中药,其化学成分复杂,所含有的主要成分大黄素具有抗肿瘤抗病毒抗菌抗炎平喘等作用、/span>
方法:采用双波长薄层扫描法,波长扫描条件:硅胶G薄层板,以甲?醋酸乙酯-甲酸?5:2:1)为展开剂,双波长反射法锯齿扫描+/span>λs=440nm+/span>λr=660nm,线性参数为3,光束狭缝:2mm×2mm
结果:点样?.202ug-1.010ug,线性关系良好,Y=1424.926X+440.17,r=0.9992;平均回收率为98.04%+/span>RSD=1.47%(n=6)
结论:方法简便准确,可用于本品质量控刵/span>
1材料与仪?/span>
1.1材料
1.11虎杖原药杏/span>:蓼科虎杖属植物的干燥根和根茎
1.12试剂:对照?/span>:大黄素对照品,其余试剂均为分析纯
1.2仪器Biostep- CD60薄层扫描仪及分析软件;高效硅胶G薄层板,电子天平+/span>5ul微量进样器,
2方法
2.1实验条件
2.1.1层析:薄层板:硅胵/span>G预制板(10cm×20cm(/span>,临用剌/span>110℃活匕/span>30min
展开:甲?/span>-醋酸乙酯-甲酸'/span>15:2:1(/span>,饱和15min后展开,取出晾干自然光下检视为黄色斑点
2.1.2扫描条件双波长扫描法锯齿扫描,测定波镾/span>λs=440nm,参比波长λr=600nm,线性参数为Sx=3,光束狭缝:2mm×2mm
2.2对照品溶液制备:取大黄素对照品约5.05mg,精密称定,?/span>50ml容量瓶中,加甲醇溶解稀释至刻度,摇匀,作为对照品溶液、/span>
2.2.2供试品溶液的制备
取虎杖粉碎过60目筛,称取约0.35g,精密称定,加蒸馏水30ml及盐酷/span>3ml,加热回?/span>2h,放冷;加氯仿回流提叕/span>2次,每次加氯仾/span>50ml,回?/span>1h,放冷,分取氯仿层;合并:酸水层置分液漏斗中,用氯仿提取三次,每欠/span>30ml,合并氯仿提取液,通过装有无水硫酸钠的漏斗,滤器用少量氯仿洗涤,洗液并入滤液中,回收氯仿,残渣加少量甲醇溶解,并用甲醇定容亍/span>10ml容量瓶中,摇匀,作为供试品溶液、/span>
2.3方法学研穵/span>
2.3.1线性关糺/span>:精密吸取对照品溶涱/span>2,4,6,8,10ul,点于同一硅胶G薄层板上,依上述条件展开后进行扫描测定。以其峰面积积分值为纵坐标,以点样量为横坐标,作图,得一条直线,回归方程9/span>Y=1424.926X+ 440.17+/span>r=0.9992.结果表明,大黄素?/span>0.202-1.010ug范围呈现良好的线性关系。结果见?/span>1
?/span>1 线性关系考察
点样?μl) |
含大黄素的量'/span>ug(/span> |
A1 |
A2 |
A |
2 |
0.200 |
732.49 |
706.27 |
719.38 |
4 |
0.403 |
991.09 |
1030.23 |
1010.66 |
6 |
0.601 |
1303.65 |
1354.19 |
1328.92 |
8 |
0.803 |
1590.76 |
1591.25 |
1591.01 |
10 |
1.010 |
1891.49 |
1845.27 |
1868.38 |
2.3.2 稳定性试骋/span>取样?/span>2ul点于薄层板上,展开。每间隔15min测定一次,1h内测宙/span>5次,积分值分别为1547.28,1515.13,1508.27,1468.45,1513.32+/span>RSD=1.66%,结果表明1h内稳宙/span>
2.3.3精密度实骋/span>取对照品6ul点于同一薄层板上,展开,将同一板上皃/span>5个点样量相同的点扫描,记录峰面积,积分值分别为1328.97,1316.54,1320.17,1332.54,1310.27+/span>RSD=0.69%,结果表明,精密度良好、/span>
2.3.4重复性实骋/span>取虎杖粉?/span>5份,每份?/span>0.37g,精密称定,按“样品溶液的制备”项下处理,叕/span>2ul点于薄层板上并测定,结果见表2,结果该批样品含大黄紟/span>1.05%+/span>RSD=1.73%,说明重复性良好、/span>
?/span>2重复性实骋/span>
取样?g) |
A1 |
A2 |
A |
大黄素含野/span>% |
0.3815 |
1542.18 |
1534.06 |
1538.12 |
1.07 |
0.3770 |
1538.29 |
1555.17 |
1546.73 |
1.03 |
0.3704 |
1553.16 |
1543.92 |
1548.54 |
1.05 |
0.3703 |
1575.38 |
1563.16 |
1569.27 |
1.07 |
0.3751 |
1549.29 |
1554.97 |
1552.13 |
1.04 |
2.3.5加样回收率试骋/span>精密称取已知含量的样品共6份,各加入到大黄素对照品野/span>3.0-4.5mg,按照“供试品液的制备”项下制备依法测定各试验液中大黄素的含量,结果见?/span>3.结果平均回收率为98.04%+/span>RSD=1.47%
?/span>3加样回收率试骋/span>