In high-precision biological experiments—such as cell isolation, protein extraction, and nucleic acid analysis—experimental success relies heavily on the structural design and material consistency of centrifuge tubes.
Different bottom geometries directly influence sample behavior during centrifugation. For example, using V-bottom tubes during cell separation can cause pellets to pack tightly at the conical apex, often leading to cell damage, incomplete resuspension, or elevated cell loss.
To address these challenges, A-Gen Bio has optimized its U-Bottom Centrifuge Tubes, delivering enhanced separation efficiency, higher sample recovery, and reliable data reproducibility across diverse laboratory workflows.
Part 01: Key Specifications
Material: High-purity, medical-grade Polypropylene (PP); USP Class VI compliant, bio-inert, and certified DNase/RNase-free, endotoxin-free, and non-pyrogenic.
Capacities: 15 mL and 50 mL, covering most standard centrifugation protocols.
Sterility: Sterilized by gamma irradiation; available in individual sterile packaging, ready for immediate use.
Graduations: High-precision printed graduations that remain crisp and clear even after high-temperature autoclaving.
Part 02: Core Product Advantages
High Centrifugal Resistance (Up to 12,000 × g)
Clearly marked for high-g endurance, A-Gen 15 mL and 50 mL U-bottom tubes withstand forces up to 12,000 × g without cracking or leaking, making them ideal for high-intensity, large-volume sample processing.
95 kPa Negative Pressure Leak-Proof Seal
Rigorously tested to pass a 95 kPa differential pressure test, the leak-proof screw caps effectively eliminate aerosol cross-contamination, protecting both samples and centrifugal equipment.
Uniform Separation via U-Bottom Geometry
The rounded U-bottom contour prevents excessive pellet packing and edge deformation during centrifugation, guaranteeing uniform separation for cell isolation, protein extraction, and downstream analysis.
Part 03: Why Choose U-Bottom Centrifuge Tubes?
Easier Pellet Resuspension:
The wide, smooth U-bottom arc forms a thin, evenly distributed pellet cake rather than a tightly jammed mass. Upon adding buffer, the pellet can be resuspended quickly with gentle pipetting, minimizing mechanical stress and physical damage to sensitive cells or proteins.
Higher Operator Fault Tolerance:
Unlike V-bottom tubes that require precise tip positioning at the narrow apex, U-bottom tubes allow flexible pipetting angles. This reduces the risk of disturbing or accidentally aspirating the pellet during supernatant removal, ensuring consistent results even across operators with varying experience levels.
Maximum Sample Recovery (>95%):
By preventing sample entrapment at a sharp point, U-bottom tubes continuously minimize cumulative sample loss throughout multi-step washing and centrifugation protocols.
Part 04: U-Bottom vs. V-Bottom Centrifuge Tubes
| Feature / Metric | U-Bottom Design | V-Bottom Design |
| Pellet Distribution | Broad, thin-layer cake across the rounded arc | Dense, tightly packed pellet concentrated at the sharp cone |
| Resuspension Ease | Fast and gentle; easily resuspended with simple pipetting | Requires repeated, vigorous mixing; risk of cell damage |
| Supernatant Removal | Clear boundary; low risk of accidental pellet aspiration | Narrow apex makes it difficult to avoid touching the pellet |
| Sample Recovery Rate | High (>95%)**; saves precious samples and reagents | Moderate; residual sample often trapped at the tip apex |
| Primary Applications | Cell collection, protein extraction, exosome harvesting, and precious samples | Rapid sample sedimentation, phase separation, and routine low-recovery protocols |
Comprehensive Portfolio for Diverse Needs
Constructed from USP Class VI polypropylene, A-Gen centrifuge tubes feature uniform wall thickness and exceptional structural integrity.
A-Gen provides a complete range of centrifuge tube capacities from 0.6 mL to 100 mL, with bottom options including V-bottom, U-bottom, and Self-standing (skirted) formats. Cap styles range from flat snap caps and double-lock caps to leak-proof screw caps, available in multiple color-coding options for easy sample identification.
About A-Gen
Founded in 2009, A-Gen Biotech is dedicated to the R&D and manufacturing of high-quality laboratory consumables for life sciences, biotechnology, and clinical diagnostics. Guided by the core principles of continuous innovation and quality first, A-Gen delivers trusted, high-performance solutions to laboratories worldwide.
Choose A-Gen, Choose Quality.
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