Clean-up/ENVIRO CLEAN C18萃取小柱,是美国SEPAX生产的，以反相C18键合硅胶为固定相的SPE小柱.其中Clean-up C18 属于通用型C18小柱，而ENVIRO CLEAN系列小柱，使用特殊材质的超净处理，特别适合环境类的微量检测的需要.
SEPAX 小柱不同系列的C18小柱都分为未封尾的C18小柱和封尾的C18小柱,
其中未封尾的C18小柱是指未处理硅胶表面的硅醇基团，提供了额外的极性相互作用，增加对碱性物质的吸附.类似产品：瓦里安 Bond Elut C18 OH小柱， Agilent SampliQ C18 小柱.
封尾的C18小柱：硅胶基质末端封尾，硅醇基团得以控制，具有低流失，高回收等特点。类似产品：Bond Elut C18 小柱， Agilent SampliQ C18 EC 小柱，waters Sep-pack C18小柱. 产品列表如下：
Clean-up C18 萃取小柱：
| 产品名称 | 规格/包装 | 封尾货号 | 未封尾货号 |
| CLEAN UP C18小柱 | 50mg/1mL 100/PK | CEC181L1 | CUC181L1 |
| CLEAN UP C18小柱 | 100mg/1Ml 100/PK | CEC18111 | CUC18111 |
| CLEAN UP C18小柱 | 100mg/3mL 50/PK | CEC18113 | CUC18113 |
| CLEAN UP C18小柱 | 200mg/3mL 50/PK | CEC18123 | CUC18123 |
| CLEAN UP C18小柱 | 500mg/3mL 50/PK | CEC18153 | CUC18153 |
| CLEAN UP C18小柱 | 500mg/6mL 50/PK | CEC18156 | CUC18156 |
| CLEAN UP C18小柱 | 1g/6mL 30/PK | CEC181M6 | CUC181M6 |
| CLEAN UP C18小柱 | 100mg/10mL 50/PK | CEC1811Z | CUC1811Z |
| CLEAN UP C18小柱 | 200mg/10mL 50/PK | CEC1812Z | CUC1812Z |
| CLEAN UP C18小柱 | 500mg/10mL 50/PK | CEC1815Z | CUC1815Z |
| CLEAN UP C18小柱 | 2g/15mL 20/PK | CEC1812M15 | CUC1812M15 |
| CLEAN UP C18小柱 | 5g/25mL 20/PK | CEC1815M25 | CUC1815M25 |
| CLEAN UP C18小柱 | 10g/75mL 10/PK | CEC18110M75 | CUC18110M75 |
ENVIRO CLEAN C18小柱：
| 产品名称 | 规格/包装 | 封尾货号 | 未封尾货号 |
| ENVIRO CLEAN C18小柱 | 50mg/1mL 100/PK | EUC181L1 | EEC181L1 |
| ENVIRO CLEAN C18小柱 | 100mg/1Ml 100/PK | EUC18111 | EEC18111 |
| ENVIRO CLEAN C18小柱 | 100mg/3mL 50/PK | EUC18123 | EEC18123 |
| ENVIRO CLEAN C18小柱 | 200mg/3mL 50/PK | EUC18153 | EEC18153 |
| ENVIRO CLEAN C18小柱 | 500mg/3mL 50/PK | EUC18156 | EEC18156 |
| ENVIRO CLEAN C18小柱 | 500mg/6mL 50/PK | EUC181M6 | EEC181M6 |
| ENVIRO CLEAN C18小柱 | 1g/6mL 30/PK | EUC1811Z | EEC1811Z |
| ENVIRO CLEAN C18小柱 | 100mg/10mL 50/PK | EUC1812Z | EEC1812Z |
| ENVIRO CLEAN C18小柱 | 200mg/10mL 50/PK | EUC1815Z | EEC1815Z |
| ENVIRO CLEAN C18小柱 | 500mg/10mL 50/PK | EUC1812M15 | EEC1812M15 |
| ENVIRO CLEAN C18小柱 | 2g/15mL 20/PK | EUC1815M25 | EEC1815M25 |
| ENVIRO CLEAN C18小柱 | 5g/25mL 20/PK | EUC18110M75 | EEC18110M75 |
| ENVIRO CLEAN C18小柱 | 10g/75mL 10/PK | EUC181L1 | EEC181L1 |
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