Gradient thermal cycler

Introduction

A gradient thermal cycler is a thermal cycler with the gradient function, which provides a temperature gradient across the sample block, used for the polymerase chain reaction (PCR), and it is used in the molecular biology, the clinical, the forensic, and the research laboratories for the amplification of the DNA and the optimization of the PCR conditions. The gradient thermal cycler consists of a sample block with the wells for the tubes and the plates, a heating and a cooling system (the Peltier elements), a temperature control system, and a control and a software system, and it provides the programmable temperature cycling, with the denaturation, the annealing, and the extension steps, and the gradient function allows the simultaneous testing of the different annealing temperatures across the block, which is used for the optimization of the PCR; the gradient thermal cycler is used for the amplification of the DNA fragments, for the PCR for the diagnostics and the research, for the optimization of the annealing temperature, for the quantitative PCR in some models, and for many other applications, and it is available in various block formats, with the different numbers of the wells; the gradient thermal cycler is an essential instrument for the PCR. Gradient thermal cyclers are used in the molecular biology laboratories, in the clinical diagnostics, in the forensic laboratories, in the research institutions, and for many other applications. With their gradient function, gradient thermal cyclers are essential for the PCR optimization.

Gradient Thermal Cycler LGTM-T2010

Gradient Thermal Cycler offers a temperature setting range of 4℃ to 105℃ and a gradient temperature range of 30 to 105℃. It is equipped with advanced an advanced semiconductor Peltier...

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Standards

ISO 20836:2021-Microbiology of the food chain-PCR for the detection of microorganisms-Thermal performance testing of thermal cyclers

Complies with the above standards, but is not limited to them.

Features

1. Gradient thermal cycler for PCR with simultaneous multiple annealing temperatures for optimization.

2. Peltier-based thermal cycler with gradient capability across block for rapid primer and assay optimization.

3. Suitable for molecular biology, clinical diagnostics, research, biotechnology, pharmaceutical and academic labs.

4. Includes gradient thermal block, Peltier modules, heated lid, controller, display, software and operation manual.

5. Supports PCR amplification, annealing temperature optimization, gradient PCR, genotyping and cloning applications.

FAQ

Q1: What testing scenarios is this cycler mainly applied to?

A: The gradient thermal cycler is used in molecular biology, clinical diagnostics, research, biotechnology, pharmaceutical, and academic laboratories to perform DNA amplification by PCR with the ability to run multiple different annealing temperatures simultaneously across the thermal block (gradient), enabling rapid optimization of PCR assays (annealing temperature, MgCl2, primer concentration) in a single run, as well as routine PCR, genotyping, cloning, and diagnostic applications. It supports PCR assay optimization (annealing temperature gradient (test 8-12 different annealing temperatures simultaneously in one run - rapidly determine optimal annealing temperature for new primer sets; saves days of separate runs), MgCl2 optimization (combine gradient with different Mg concentrations across rows), primer concentration optimization, cycling condition optimization), routine PCR (DNA amplification for cloning, genotyping, sequencing preparation, colony PCR - after optimization, use optimal conditions for routine runs), clinical diagnostics (pathogen detection (viruses, bacteria), genetic testing, rapid screening - gradient for assay development, then fixed conditions for routine testing), biotechnology and pharmaceutical (primer/probe design validation, assay development for diagnostic kits, high-throughput screening), and research (molecular biology, genetics, genomics, gene expression, mutation detection).

Q2: What standards does the cycler comply with?

A: The gradient thermal cycler follows relevant IEC, ISO and GB/T standards including IEC 61010 (safety requirements for electrical laboratory equipment), IEC 61326 (EMC), and applicable medical device regulations (FDA, CE IVD, NMPA) if used for clinical diagnostics. For research use only (RUO) models, no IVD certification is required. Calibration should verify temperature accuracy, uniformity, and gradient accuracy (temperature difference across block) using calibrated temperature probes or traceable temperature verification system. For clinical use, follow applicable quality management (CLIA, CAP, ISO 13485) and the cycler should be IVD-registered.

Q3: What is the warranty period for the whole cycler and key components?

A: The whole gradient thermal cycler is covered by a 12-month warranty. The gradient thermal block, Peltier modules (multiple independent Peltier elements for gradient), heated lid, controller, display, software and housing are covered, while block seals, fuses, and power cord are consumables or accessories. Damage from improper use, liquid spillage, overheating, Peltier module failure, or unauthorized repair is excluded. Extended warranty may be available. Gradient cyclers have multiple Peltier modules (typically 6-12 independent zones for gradient), which may have separate warranty terms; Peltier lifespan typically 10000+ cycles.

Q4: Is this device difficult to operate? Is professional training required?

A: Operation requires trained molecular biology personnel familiar with PCR and gradient technology. We provide operation manuals and training. Proper instrument setup (stable, heat-resistant surface, adequate ventilation, power connection), gradient program setup (enter gradient parameters: set denaturation and extension temperatures (uniform across block), set annealing temperature gradient (define minimum and maximum annealing temperatures across columns (e.g., 50-65 degrees C); the cycler calculates intermediate temperatures for each column (typically 8-12 columns = 8-12 temperatures); set gradient direction (left-to-right or front-to-back depending on block orientation); set ramp rates, cycle number, times; some cyclers allow gradient in other steps (not just annealing - e.g., gradient denaturation for optimization, though annealing gradient is most common)), sample preparation (prepare PCR master mix, aliquot into tubes/plate (gradient is across columns - put same reaction mix in each column (same primers, template, reagents) so the only variable is annealing temperature; for MgCl2 gradient, put different Mg concentration in each row; for full factorial optimization, use columns = temperature gradient, rows = Mg concentration (requires 96-well plate); centrifuge briefly, load into block (ensure proper orientation for gradient), run PCR, post-run analysis (run gel electrophoresis, compare product yield/specificity across temperatures, select optimal annealing temperature (highest specific product, lowest non-specific/primer-dimer), convert gradient program to fixed-temperature program for routine use), and maintenance (block cleaning, vent cleaning, software updates, Peltier performance check) are important for successful gradient PCR.

Q5: What is the typical lead-time for order delivery?

A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.

Q6: Is regular calibration required? What is the recommended calibration cycle?

A: Temperature calibration recommended every 6-12 months using calibrated temperature probe system (verify at multiple set points; verify gradient accuracy (actual temperature at each column vs programmed gradient - gradient accuracy typically +/- 0.2-0.5 degrees C; verify at multiple gradient ranges (e.g., 50-60, 55-65, 60-70 degrees C); verify temperature uniformity within each column (well-to-well variation < 0.4-0.5 degrees C)). Heated lid temperature verification every 6-12 months. Timer accuracy verification every 6-12 months. Routine performance verification with control PCR per month or per batch. Full cycler performance verification annually (including gradient linearity and accuracy). For clinical/IVD use, follow applicable calibration schedules and maintain records.

Q7: Are supporting consumables universal?

A: PCR tubes/strips/plates (0.2 mL tubes, 8-tube strips, 96-well plates (most gradient cyclers use 96-well plates for full gradient (12 columns = 12 temperatures); some also accept 0.2 mL tubes/strips; use thin-wall for good thermal transfer; verify compatibility), pipette tips, PCR reagents (Taq, dNTPs, primers, buffer, MgCl2, template), sealing film (for 96-well plates), cleaning supplies, and fuses are available from molecular biology suppliers, though plate/tube format may be specific to cycler model (most accept standard 0.2 mL PCR tubes/strips and standard 96-well plates (ABGene, Eppendorf, Bio-Rad formats - most are compatible, but verify). Long-term consumable cost includes PCR consumables and reagents (primary ongoing cost).

Q8: Can I customize parameters or supporting accessories?

A: Customization includes block format (96-well (standard for gradient - 12 columns x 8 rows; gradient across 12 columns), 384-well (16 columns x 24 rows; higher throughput, smaller volume; gradient across 16 columns), 0.2 mL tube/strip (16-32 tubes; some gradient cyclers also accept tubes/strips but gradient may be limited (fewer columns)), interchangeable blocks (some models allow swapping between 96-well and 384-well or tube blocks)), gradient resolution (number of independent temperature zones (6, 8, 12, 16 zones - more zones = finer gradient resolution; 12-zone is standard for 96-well (one per column); 16-zone for 384-well), gradient range (typically +/- 25 degrees C from a center temperature, or absolute range 30-80 degrees C for annealing; maximum gradient difference across block (typically 20-30 degrees C)), temperature range (4-100 degrees C standard), ramp rate (2-6 degrees C/sec standard, up to 8 degrees C/sec for fast models), temperature uniformity (+/- 0.2 to +/- 0.5 degrees C), heated lid (adjustable 90-115 degrees C), control interface (buttons + LCD, touchscreen, PC software, app control), connectivity (USB, Ethernet, WiFi, Bluetooth), software (program storage, gradient programming (visual gradient editor), real-time monitoring, data logging, firmware updates), power, construction, language and accessories. Additional blocks, plates, and accessories can be ordered separately.

Q9: Does the purchase include on-site installation and commissioning service?

A: Standard delivery includes the gradient thermal cycler, power cord, user manual, and sometimes quick-start guide. On-site installation is not required (plug and play). On-site training is not included for standard orders but can be arranged at additional cost (for gradient PCR optimization training, clinical labs). Remote guidance is provided.

Q10: What types of assays are compatible with this equipment?

A: The gradient thermal cycler performs all standard PCR assays (as listed in mini thermal cycler entry: endpoint PCR, RT-PCR, multiplex PCR, nested PCR, touchdown PCR, hot-start PCR, long-range PCR, colony PCR, isothermal amplification) with the key additional capability of GRADIENT PCR (simultaneous multiple temperatures across the block), which is particularly useful for: Annealing temperature optimization (the most common use - for new primer sets, determine optimal annealing temperature in one run (instead of 8-12 separate runs); set gradient across expected Tm range (e.g., 50-65 degrees C); after gel analysis, select temperature giving best specific yield; this saves significant time and reagents during assay development), MgCl2 concentration optimization (combine temperature gradient (columns) with MgCl2 concentration (rows) in a 96-well plate - full factorial optimization of two variables in one run (e.g., 12 temperatures x 8 Mg concentrations = 96 conditions; very powerful for difficult assays), Primer concentration optimization (similar factorial approach), Denaturation/extension temperature optimization (some cyclers allow gradient in other steps (not just annealing) - useful for optimizing denaturation temperature (for GC-rich templates, higher denaturation may help) or extension temperature (for some polymerases), Touchdown PCR setup (gradient cyclers can also run touchdown programs (gradually decreasing annealing temperature over cycles) - some models have built-in touchdown programming; touchdown is useful for difficult templates and reducing non-specific amplification), Multiplex PCR optimization (gradient helps optimize annealing temperature for multiplex reactions (multiple primer sets with different Tms - find compromise temperature that works for all primer sets; gradient can also help identify primer-dimer issues at different temperatures), GC-rich template optimization (GC-rich templates are difficult (high melting temperature, secondary structure); gradient helps find optimal denaturation and annealing temperatures; combine with GC buffer, DMSO, betaine additives), Low-copy target optimization (for sensitive assays (low template copy number), gradient helps find conditions with maximum sensitivity and minimum non-specific amplification), Clinical diagnostic assay development (for developing IVD assays, gradient is essential for robust assay optimization (find annealing temperature with wide working range (assay is tolerant of temperature variations - important for consistent performance across different cyclers and labs); validate assay at optimal conditions before IVD submission), and any PCR assay where optimization of thermal conditions is needed. IMPORTANT: Gradient technology: (1) How it works: Gradient cyclers have multiple independent Peltier elements (typically 6-12) under different sections of the block, allowing each section to be at a different temperature simultaneously; for 96-well block (8 rows x 12 columns), gradient is typically across the 12 columns (each column = one temperature; rows are at the same temperature within a column); this allows 12 different annealing temperatures in one run; for 384-well (16 x 24), gradient across 16 columns. (2) Gradient range: The maximum temperature difference across the block is typically 20-30 degrees C (e.g., 45-75 degrees C); you set a center temperature and gradient width, or set minimum and maximum temperatures directly; the cycler calculates intermediate temperatures linearly (or sometimes non-linearly - verify) across columns. (3) Gradient accuracy: The actual temperature at each column should match programmed temperature within +/- 0.2-0.5 degrees C; gradient accuracy should be verified during calibration (especially at the extremes of the gradient range, where Peltier performance may be less accurate). (4) Using gradient results: After running a gradient PCR, analyze products by gel electrophoresis (or other detection); compare yield and specificity across temperatures; optimal temperature is typically where specific product yield is high and non-specific products (including primer-dimer) are low; for robust assays, choose a temperature in the middle of the "working range" (range of temperatures giving good results - this makes the assay less sensitive to minor temperature variations between cyclers or runs); convert the gradient program to a fixed-temperature program (set annealing temperature to optimal, disable gradient) for routine use. (5) Limitations: Gradient only varies temperature across columns (not rows - rows are at the same temperature); if you need to test multiple variables simultaneously (temperature + Mg + primer), use a full factorial plate layout (columns = temperature, rows = variable); gradient cyclers are more expensive than non-gradient cyclers (due to multiple Peltier elements and control electronics); for routine PCR after optimization, gradient capability is not needed (but useful to have for future assay development); some mini cyclers lack gradient (if you need gradient, verify before purchasing - it is a key differentiator). (See mini thermal cycler entry for general PCR considerations, contamination prevention, clinical/IVD use, and PCR optimization - all apply to gradient cyclers as well.)