Caplugs® Evergreen
0.37 mL Caps, Round Bottom, PS, Natural — 290-8172-01R | 99/Bag | Caplugs® Evergreen
0.37 mL Caps, Round Bottom, PS, Natural — 290-8172-01R | 99/Bag | Caplugs® Evergreen
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8-Well Round Bottom Strips, 0.37 mL Well Volume, PS, Natural — 290-8172-01R | 50 Strips/Bag
| Quick Reference — 290-8172-01R | |
|---|---|
| Format | 8-well strip — fits standard 12-position strip frame |
| Bottom | Round Bottom (U-Bottom) |
| Well Volume | 0.37 mL |
| Material | Polystyrene (PS) |
| Color | Natural (transparent) |
| Strip Frame | Compatible with 290-8103-Z1N HIPS black strip frame |
| Pack Size | 50 strips / Bag (400 wells total) |
| Price | $325.99 / Bag ($0.3260 / strip, $40.7482 / well) |
Technical Narrative
The Caplugs® Evergreen is a round-bottom 8-well PS strip — the individual strip unit for partial-plate ELISA, suspension cell culture, and agglutination assays in strip format. Each strip holds 8 wells with 0.37 mL round-bottom (U-bottom) geometry that allows cells and particles to settle by gravity into a uniform central pellet — the same behavior as a full 96-well round-bottom plate, delivered at the 8-well strip scale for modular workflow economics. Strips seat in standard 12-position SBS strip frames (compatible with Caplugs® Evergreen 290-8103-Z1N) to create a full 96-position SBS footprint for automated washer, reader, and robotic handler compatibility.
The partial-plate ELISA advantage of strip format is most significant for round-bottom serology and agglutination assays: run only the sample strips required, return unused antibody-coated strips to cold storage, and eliminate the per-plate waste of coating reagents on unused wells. For HAI hemagglutination inhibition assays — where round-bottom well geometry is the WHO standard for RBC button scoring — strip format enables sample-count-matched strip loading without fixed plate format constraints. PS construction provides excellent resistance to standard ELISA buffers, cell culture media, and aqueous assay reagents across the full strip service life.
At $325.99 per 50-strip Bag — $0.3260 per strip — the delivers round-bottom 8-well strip capacity at economics suited to strip-per-sample allocation in low-to-moderate throughput assay programs.
Technical Specifications — Caplugs® Evergreen
| Specification | Value |
|---|---|
| Part Number | |
| Caplugs Item # | 290817201RE1 |
| Format | 8-well strip |
| Bottom | Round (U-Bottom) |
| Well Volume | 0.37 mL |
| Material | Polystyrene (PS) |
| Color | Natural |
| Strip Frame | Compatible with Caplugs® 290-8103-Z1N HIPS frame |
| Sterility | Non-Sterile |
| Pack Size | 50 strips / Bag |
| Wells/Bag | 400 (50 strips × 8 wells) |
| Application | Partial-plate ELISA, suspension cell culture, HAI, serial dilution |
| BPA/Phthalate | BPA-free; no phthalate plasticizers |
| Country of Origin | Made in U.S.A. (California) |
Round Bottom 8-Well Strip Workflow Compatibility —
Round-bottom 8-well strips seat in standard 12-position SBS strip frames for partial-plate and strip-format assay workflows:
| Application | Assay / Use | Notes |
|---|---|---|
| Partial-plate ELISA | Antibody-coated strip-format ELISA | Load only required strips — return unused to cold storage |
| Suspension cell culture | Lymphocyte, hybridoma, PBMC in strip wells | Round bottom allows cells to settle into uniform pellet |
| HAI / agglutination assays | Hemagglutination inhibition, viral titer | Round bottom is WHO standard for HAI RBC button scoring |
| Immunoassay (partial plate) | Allergen-specific IgE, serology strip assays | Standard ELISA strip format for partial-plate serology |
| Cell-based luminescence strips | Luciferase reporter in suspension cells | Round bottom for suspension culture with strip-format economics |
| Serial dilution (strip format) | 8-step 2-fold dilution series per strip | Round bottom for cell or bead pellet clarity during dilution |
| Drug screening (strip format) | Compound dose-response in strip wells | Low-volume strip screening before committing to full plate |
| Bacterial MIC (strip format) | Minimum inhibitory concentration in 8-well strip | Round bottom shows clear button vs turbidity for MIC scoring |
Confirm strip-to-frame fit with a sample pair before bulk purchase. Caps sold separately — use standard flat or domed 8-strip caps for sealed storage and PCR applications.
Chemical Resistance — Polystyrene (PS)
PS resists aqueous assay reagents. Not autoclave-compatible.
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers (PBS, TBS, HEPES) | ✓ Excellent |
| Cell culture media | ✓ Excellent |
| DMSO (≤10%) | ✓ Good |
| Short-chain alcohols (brief) | ✓ Good |
| Formalin (4%, brief fixation) | ✓ Good |
| Acetone | ✗ Avoid |
| Autoclave (121°C) | ✗ Not compatible |
Laboratory Applications
The serves serology and immunology labs running partial-plate HAI and hemagglutination assays; clinical microbiology programs running MIC broth microdilution in strip format; cell biology programs culturing suspension lymphocytes and hybridomas in strip wells; cytokine and multiplex bead assay programs in strip format; drug discovery programs running initial 8-point dose-response screens in strip wells before committing to full plates; and any workflow requiring U-bottom 8-well format in a modular strip configuration.
U.S. Manufacturing, Quality & Institutional Procurement
Every Caplugs® Evergreen lot is precision-molded at our California manufacturing facility and subject to rigorous dimensional inspection and material purity verification. We supply reference laboratories, hospital systems, biotech firms, and federal procurement offices under institutional pricing programs with blanket-order support and same-day shipping on stocked inventory. Request a sample below to validate before committing to volume.
Frequently Asked Questions — Caplugs® Evergreen
What strip frame is compatible with the strips?
The strips are compatible with the Caplugs® Evergreen 290-8103-Z1N black HIPS 12-position strip frame, which converts 12 individual 8-well strips into a full 96-position SBS-footprint format. Standard 12-position strip frames from other manufacturers in SBS-standard inter-strip spacing are also generally compatible. Always validate strip-to-frame fit with a sample pair before large-volume purchase.
What is the difference between round-bottom and open-bottom (290-8174-000) strips?
Round-bottom strips have U-shaped well floors — liquid and cells are contained in each well, making them suitable for ELISA, cell culture, and agglutination assays. Open-bottom strips (290-8174-000) have no well floors — the bottom of each well is open, enabling membrane filter attachment, electrode contact, or custom surface integration from below. Choose round-bottom for standard containment assays; open-bottom for membrane, electrode, or biosensor applications.
Are the strips BPA-free?
Yes. Molded from virgin Polystyrene (PS) containing no BPA and no phthalate plasticizers.
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