1.5 mL Microcentrifuge Tubes, PP, Natural — 208-3388-060 | 200/Bag | Caplugs® Evergreen

Universal SPE Columns with Medium Filter (45–90 µm), PP, Natural — 200/Bag

These Caplugs® Evergreen universal solid-phase extraction columns feature an integrated medium-grade filter (45–90 µm pore size) molded from natural polypropylene, supplied non-sterile in 200/Bag packaging. The universal column body is engineered to fit standard 1.5 mL, 2 mL, and 5 mL collection tube positions and to operate across gravity-flow, vacuum manifold, and centrifuge-driven workflows — eliminating the format-specific column lock-in that complicates multi-method labs. Part number 208-3388-060 represents the medium-pore option in the Caplugs® Evergreen universal PP column series, balancing flow rate and filtrate clarity for the widest range of routine sample matrices.

Technical Specifications

Applications

• Serum and plasma cleanup prior to LC-MS/MS, immunoassay, or HPLC analysis
• Moderately turbid urine sample preparation for clinical and toxicological workflows
• Environmental matrix SPE — water, soil extracts, and food matrices with moderate suspended-solid loads
• Gravity-flow and vacuum manifold SPE across multi-port platforms with universal tube holders
• Centrifuge-driven sample processing at standard bench centrifuge speeds (≈3000×g) in 1.5 mL, 2 mL, or 5 mL collection tube positions
• Method scouting and protocol development where a single column format must serve multiple downstream collection-tube configurations

Compatibility

The universal column body geometry is designed to seat in standard 1.5 mL microcentrifuge tube positions, 2 mL collection tubes (the primary format for most universal column workflows), and 5 mL collection tubes — confirm outer-diameter clearance with your specific 5 mL tube format before use. On the automation and manifold side, these columns adapt to multi-port vacuum SPE manifolds equipped with universal tube holders and to any gravity-flow SPE bench stand, making them compatible with commonly used open-platform SPE systems from major laboratory suppliers. Because no length-matched manifold holder is required, labs running diverse SPE platforms can stock a single column SKU across multiple methods. The medium 45–90 µm pore size is the standard-balance filter grade for this format; for coarser filtration needs see the companion 208-3387-060 (90–135 µm coarse filter), and for fine filtration see 208-3389-060 (15–45 µm fine filter).

Chemical Resistance

Quality & Procurement

Made in USA, these Caplugs® Evergreen universal SPE columns are manufactured under ISO 9001 quality management from FDA-compliant, BPA-free, phthalate-free polypropylene resin with a molded integrated filter disk for consistent pore geometry across every column in the bag. LabSupplies.com is an authorized dealer and ships from USA inventory, typically same business day for stocking items, with volume pricing available for laboratories ordering ten or more bags — well suited to institutional procurement cycles, grant-funded research accounts, and high-throughput clinical prep labs.

Frequently Asked Questions

What sample types are best suited to the medium 45–90 µm filter grade?
The medium pore size is the general-purpose choice for serum, plasma, moderately turbid urine, and environmental or food matrices that carry a moderate suspended-solid load. It delivers a practical balance of flow rate and filtrate clarity without the slower throughput of fine-grade columns. For heavily particulate matrices choose the coarse 90–135 µm grade (208-3387-060); for demanding clarity requirements use the fine 15–45 µm grade (208-3389-060).

Will these columns work on a vacuum manifold as well as a benchtop centrifuge?
Yes. The universal column body is designed to operate across gravity-flow, vacuum manifold, and centrifuge-driven workflows. No length-matched manifold holder is required for manifold use, and the polypropylene construction maintains dimensional stability under standard centrifuge force and vacuum, ensuring consistent geometry across all three elution modes.

Are these SPE columns sterile?
No — they are supplied non-sterile. For most SPE sample-preparation workflows sterility is not a requirement, but if your assay demands a sterile consumable, please contact your application specialist before ordering.

Can polypropylene columns be used with acetonitrile- or methanol-based mobile phases?
Yes. Polypropylene offers good compatibility with acetonitrile and methanol, the most common organic modifiers in reversed-phase and protein-precipitation SPE workflows. Chlorinated solvents such as chloroform or dichloromethane, and aromatic solvents such as toluene, are not recommended for use with PP columns.