Western blotting system

Introduction

A western blotting system is a laboratory system used for the western blotting, which is a technique for the detection of the specific proteins in a sample, and it is used in the molecular biology, the biochemistry, the clinical, and the research laboratories for the protein analysis. The western blotting system consists of the equipment for the gel electrophoresis, in which the proteins are separated by the size; the transfer equipment, in which the separated proteins are transferred from the gel to a membrane, such as the nitrocellulose or the polyvinylidene fluoride (PVDF) membrane, by the application of the electric field; the blocking, the antibody incubation, and the washing equipment; and the detection equipment, such as the chemiluminescence or the fluorescence imager; the western blotting is performed by the separation of the proteins, the transfer to the membrane, the blocking of the non-specific binding, the incubation with the primary and the secondary antibodies, and the detection of the target proteins, and it is used for the detection and the quantification of the specific proteins, for the analysis of the protein expression, for the verification of the antibodies, for the diagnosis, and for many other applications; the western blotting system provides the complete equipment for the technique, with features such as the efficient transfer and the sensitive detection. Western blotting systems are used in the molecular biology and the biochemistry laboratories, in the clinical diagnostics, in the pharmaceutical industry, in the research institutions, and for many other applications. With their protein detection, western blotting systems are essential for the protein analysis.

Western Blotting System LBSW-T2010

Western Blotting System has a gel transfer area of 100 × 100 mm, ideal for standard applications. It uses only 750 ml of buffer, allowing efficient protein transfer with less liquid. Fo...

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Standards

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

Features

1. Western blotting system for protein detection and analysis via gel electrophoresis, transfer and immunodetection.

2. Integrated system for SDS-PAGE electrophoresis, semi-dry/wet transfer, blocking, antibody incubation and chemiluminescence imaging.

3. Suitable for molecular biology, biochemistry, pharmaceutical, clinical research and biotechnology laboratories.

4. Includes electrophoresis unit, transfer apparatus, power supply, blotting membranes, reagents (if included), and operation manual.

5. Supports protein separation, transfer to membrane (PVDF/nitrocellulose), antibody probing and detection of specific proteins.

FAQ

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

A: The Western blotting system is used in molecular biology, biochemistry, pharmaceutical, clinical research, and biotechnology laboratories to detect and quantify specific proteins in complex samples, combining gel electrophoresis (protein separation by size), transfer to a membrane, and antibody-based immunodetection (chemiluminescence or fluorescence). It supports molecular biology and biochemistry research (protein expression analysis (compare protein levels across samples/conditions), post-translational modification detection (phosphorylation, ubiquitination, glycosylation - phospho-specific antibodies), protein-protein interaction (co-IP followed by Western), subcellular fractionation (verify fraction purity with organelle markers), protein validation (antibody specificity, knockout/knockdown verification), gene expression studies (protein level confirmation of mRNA results)), pharmaceutical and biotech (biologic drug development (monoclonal antibody characterization, protein drug quantification, host cell protein (HCP) detection), vaccine development (antigen detection, immune response), biomarker discovery and validation (disease biomarkers, drug efficacy markers), quality control (protein product identity, purity, stability testing), clinical research (disease biomarker studies (cancer, neurodegenerative, autoimmune), patient sample analysis (serum, tissue lysates), therapeutic monitoring (drug target engagement), pharmacodynamics (PD biomarkers), and agriculture/plant science (plant protein expression, genetically modified organism (GMO) detection (protein-based), veterinary research). Western blot workflow: (1) Sample prep: lyse cells/tissue, quantify protein (BCA, Bradford). (2) SDS-PAGE: denature proteins with SDS + heat, load on polyacrylamide gel, separate by molecular weight via electrophoresis (current through gel). (3) Transfer: transfer proteins from gel to membrane (PVDF or nitrocellulose) via electroblotting (wet or semi-dry). (4) Blocking: block non-specific binding sites (5% milk or BSA in TBST). (5) Primary antibody: incubate with antibody specific to target protein (binds target). (6) Secondary antibody: HRP- or fluorophore-conjugated secondary antibody binds primary. (7) Detection: chemiluminescence (HRP + substrate -> light, captured by imager/film) or fluorescence (scanner). (8) Analysis: quantify band intensity (ImageJ, software), normalize to loading control (actin, GAPDH, tubulin) or total protein stain. This is a complete system (may include electrophoresis + transfer + power supply + imager) or components. FAQ focuses on workflow, use, troubleshooting, and maintenance.

Q2: What standards does the system comply with?

A: The Western blotting system follows relevant ISO, IEC, FDA and GB/T standards including ISO 9001 (quality management), IEC 61010 (laboratory electrical equipment safety - for power supply, imager), FDA (if for clinical/IVD use - research use only (RUO) for most systems; IVD if cleared), and GB/T standards for molecular biology equipment. The hardware complies with applicable electrical safety (IEC 61010), EMC (IEC 61326), and performance specifications (voltage/current for power supply, transfer efficiency, imaging sensitivity). For pharmaceutical use, follow cGMP (21 CFR Part 211) for QC testing and GLP for preclinical studies. For clinical research, follow institutional review board (IRB) protocols and good clinical practice (GCP). For antibody use, follow manufacturer datasheets and validation (many journals now require antibody validation data). For quantitative Western blotting, follow best practices (MIQE - Minimum Information for Publication of Quantitative Real-Time PCR Experiments has analog for Western: published guidelines for quantitative Western blots; use total protein normalization vs housekeeping genes). For regulated labs, maintain equipment qualification (IQ/OQ), calibration records (power supply voltage/current, imager calibration), and SOPs. For IVD use (if applicable), follow FDA 510(k), CE-IVD, or NMPA clearance. Most Western blot systems are RUO (research use only), not IVD. Reagents (antibodies, membranes, substrates) have their own storage/expiration requirements.

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

A: The whole Western blotting system is covered by a 12-24 month warranty (lab/molecular biology instruments often 1-2 years; some 3 years for imagers). The electrophoresis unit, transfer apparatus, power supply, and imager (if included) are covered, while reagents and consumables (antibodies, membranes (PVDF/nitrocellulose), precast gels, running buffer, transfer buffer, blocking reagent, substrates (ECL), molecular weight markers - per-experiment cost, expire) are consumables/accessories. Damage from improper use, buffer leakage/corrosion (electrophoresis/transfer buffers contain salts/detergents - can corrode electrodes/equipment if not cleaned; rinse after use), gel breakage, power supply overload (exceeding voltage/current limits), imager contamination (substrate spill on optics/CCD - clean promptly), using wrong voltage (can overheat gels, break equipment), or unauthorized repair is excluded. Extended warranty and service contracts (preventive maintenance, calibration, lamp replacement) may be available. Power supply lasts 5-10 years; electrophoresis/transfer units 3-7 years (electrodes corrode over time); imager CCD camera 5-10 years; reagents are ongoing cost (antibodies $200-$1000+ each, membranes, substrates).

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

A: Operation requires trained molecular biology personnel (familiar with protein biochemistry, gel electrophoresis, antibody techniques). We provide operation manuals, installation, and training (typically 1-3 days for complete system, especially imager software). Western blotting is a multi-step, technique-sensitive assay - training and practice are important for reproducible results. Proper workflow (sample prep (lyse cells/tissue with RIPA or other lysis buffer + protease/phosphatase inhibitors; quantify protein (BCA, Bradford, Lowry); normalize samples to equal concentration; add Laemmli buffer + reducing agent (DTT or beta-mercaptoethanol); heat denature (95 C, 5 min)), SDS-PAGE (prepare or use precast gel (4-20% gradient or fixed %); assemble electrophoresis unit; fill with running buffer (Tris-glycine-SDS); load samples + molecular weight marker; run at constant voltage (100-200 V) until dye front reaches bottom (30-90 min)), transfer (wet transfer (gel + membrane + filter paper sandwich in transfer buffer; 100 V, 60-90 min, cold room/ice) or semi-dry (fast, 10-25 min, limited buffer); PVDF membrane must be activated in methanol first; nitrocellulose no activation; ensure no bubbles between gel and membrane (bubbles = no transfer)), blocking (incubate membrane in blocking buffer (5% non-fat milk or BSA in TBST or PBST) for 1 hour at room temp or overnight at 4 C; BSA preferred for phospho-proteins (milk contains phosphoproteins)), primary antibody (dilute antibody in blocking buffer per datasheet (1:500 to 1:10000 typical); incubate 1-2 hours at room temp or overnight at 4 C with agitation; optimize dilution for each antibody), wash (3x 5-10 min with TBST/PBST), secondary antibody (HRP- or fluorophore-conjugated anti-species IgG; dilute per datasheet (1:5000 to 1:20000); incubate 30-60 min at room temp; protect from light if fluorescent), wash (3x 5-10 min), detection (chemiluminescence: apply ECL substrate (HRP + luminol -> light), image with CCD imager or X-ray film; fluorescence: scan with fluorescence imager at appropriate wavelength), analysis (quantify band intensity with ImageJ or vendor software; normalize to loading control (beta-actin, GAPDH, tubulin) or total protein stain (Ponceau, Revert); compare relative expression across samples), post-experiment (clean equipment (electrophoresis/transfer units - rinse with DI water, dry; prevent buffer corrosion), dispose gels/chemicals per regulations (acrylamide is neurotoxic (unpolymerized), Coomassie, buffers), store antibodies (aliquot, -20 C, avoid freeze-thaw), maintenance (daily: clean workarea, wipe equipment, check reagent levels; weekly: clean electrophoresis/transfer units (remove buffer residue, check electrodes), inspect cables; monthly: verify power supply output (voltage/current with multimeter), clean imager (tray, optics - no substrate residue), check lamp/CCD; semi-annually/annually: professional calibration (power supply, imager), lamp replacement (if UV/fluorescence), software update), troubleshooting (no bands / weak signal (protein not transferred (bubbles, transfer time too short, wrong orientation (gel on cathode side, membrane on anode side), methanol too high (for small proteins), antibody too dilute (increase concentration or incubation time), protein not expressed/too low (load more protein, enrich sample), substrate expired (replace), over-blocking (reduce blocking time/concentration), primary antibody not binding (wrong species, wrong antibody, epitope masked (try antigen retrieval, different antibody)), too many bands / non-specific (antibody not specific (try different antibody, higher dilution, more stringent wash (higher salt/Tween), blocking insufficient (increase blocking), protein degradation (use fresh protease inhibitors, work on ice), molecular weight marker not loaded (load marker to identify bands)), high background (blocking insufficient (increase), secondary antibody cross-reactivity (use pre-adsorbed secondary, higher dilution), membrane dried out (keep wet throughout), substrate contamination (clean imager, fresh substrate), antibody concentration too high (dilute more)), bands smeared / smiling (gel overloaded (reduce protein), voltage too high (reduce, run slower), gel percentage wrong (use appropriate % for protein size), buffer issues (fresh buffer, correct pH), protein aggregation (ensure complete denaturation, use fresh DTT), transfer bubbles (remove bubbles with roller), uneven bands / smiling (gel not polymerized properly (use fresh APS/TEMED), well leakage (check gel assembly), voltage too high (reduce)), and safety (ELECTRICAL (power supply outputs high voltage (100-300 V) - risk of shock; do not touch electrodes while running; turn off before disconnecting; use properly grounded units; do not use with wet hands; buffer spill can cause short circuit - clean up), CHEMICAL (acrylamide (unpolymerized is neurotoxic - wear gloves, handle carefully; polymerized gels less toxic but still handle), beta-mercaptoethanol (toxic, foul smell - use in fume hood, PPE), DTT (irritant), SDS (irritant, wear gloves), methanol (flammable, toxic - fume hood), ECL substrate (contains hazardous chemicals - wear PPE), Coomassie (stain, irritant), dispose all per EHS regulations), UV (if using UV transilluminator for DNA/RNA - eye/skin protection; Western usually not UV but some systems have), CROSS-CONTAMINATION (use clean pipette tips, change gloves between samples, prevent carryover between lanes (load carefully), for clinical samples: BSL-2 precautions, do not reuse membranes for different targets without stripping (stripping can remove target), do not touch membrane with bare hands (use tweezers), for quantitative blots: use same exposure time, same gel, technical replicates; follow MIQE-like guidelines for publication), do not exceed power supply voltage/current ratings (can overheat, damage gel/equipment), for fluorescent Western: protect membrane from light (aluminum foil, dark incubator), do not let membrane dry out (causes high background, poor signal), dispose of radioactive waste if using radioisotope detection (rare now, mostly chemiluminescence/fluorescence)) are important for successful Western blotting. See 3290 (phase contrast microscope) for general lab safety overlap.

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: Calibration/performance verification recommended every 6-12 months: power supply (verify voltage/current output with calibrated multimeter at multiple setpoints), imager (calibrate with standard light source or fluorescence calibration slide, verify linearity, sensitivity, uniformity; for quantitative work, ensure detector linear range), and electrophoresis/transfer (verify timing, temperature). Routine checks: power supply display vs actual (monthly), imager background/noise (weekly), and reagent QC (new antibody lots should be validated (test with positive control)). For GMP/pharma QC, follow applicable schedules and maintain records (calibration certificates, as-found/as-left data, equipment logs, reagent lot validation). For quantitative Western blotting, include positive and negative controls, loading controls, and technical replicates on each gel. Imager lamp/CCD should be checked annually (replacement if sensitivity drops). Power supply should be calibrated if readings drift or after repair. For fluorescence imagers, calibrate fluorescence channels with calibration slides per manufacturer. Software should be validated for quantitative accuracy (compare with known standards).

Q7: Are supporting consumables universal?

A: Reagents and consumables are mostly universal across brands (precast gels (Bio-Rad, Thermo, Invitrogen - standard mini-gel format (8.6 x 6.7 cm) is somewhat universal; use brand-compatible for cassette), membranes (PVDF, nitrocellulose - universal from Millipore, Bio-Rad, GE; 0.22 or 0.45 micrometer pore size), running/transfer buffers (can be lab-prepared or purchased (Bio-Rad, Thermo)), blocking reagents (milk, BSA - universal), antibodies (primary/secondary from many suppliers (CST, Abcam, Santa Cruz, R&D, Sigma); species-specific secondary must match primary), ECL substrate (Millipore, Bio-Rad, Thermo, Advansta - universal), molecular weight markers (prestained, fluorescent - universal), and power supply/electrophoresis units (somewhat standard but use compatible components (Bio-Rad Mini-PROTEAN, Thermo XCell SureLock - not all interchangeable)) are available from molecular biology supply companies. Long-term consumable cost is SIGNIFICANT (antibodies $200-$1000+ each (but last many experiments), precast gels $5-$15 each, membranes $1-$5 each, ECL substrate $50-$300 per kit, buffers). Use vendor-compatible cassettes/units for best fit, but reagents are largely interchangeable.

Q8: Can I customize parameters or supporting accessories?

A: Customization includes system components (electrophoresis unit only (mini or large format), transfer unit only (wet, semi-dry, dry), power supply (single/dual output, programmable, 10-300 V, 0.1-2 A), imager (chemiluminescence CCD (cooled, high sensitivity), fluorescence (multi-channel, NIR for multiplex), or combined chemiluminescence + fluorescence), or complete system (all components + software)), gel format (mini-gel (8.6 x 6.7 cm, most common, fast) or large gel (for high resolution, prep)), transfer type (wet tank (best for all proteins, especially large/small; slower, more buffer) or semi-dry (fast, 10-25 min, less buffer; good for medium proteins) or dry (no buffer, fastest, limited to certain sizes)), detection (chemiluminescence (HRP + ECL, most common, high sensitivity, film or CCD) or fluorescence (fluorophore-conjugated secondary, multiplex (2-5 colors simultaneously), more quantitative, stable) or colorimetric (AP/NBT-BCIP, less common now)), software (basic (image capture, contrast) or advanced (quantitation, lane/band analysis, molecular weight calculation, normalization, 21 CFR Part 11 compliance, database, report generation)), automation (automated processor (automates blocking, antibody, washing - reduces variability, high throughput)), accessories (extra electrophoresis/transfer units, power supply, precast gels (various percentages), membranes (PVDF/nitrocellulose, various sizes), antibody panel (target-specific), ECL substrate, molecular weight markers (prestained/fluorescent), buffer kits, blotting paper, pipettes, cold room (for transfer), validation package (IQ/OQ), certifications (CE, ISO 9001, IEC 61010, 21 CFR Part 11 software), language and accessories. Additional reagents, gels, and accessories can be ordered separately.

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

A: Standard delivery includes Western blotting system components (electrophoresis unit, transfer apparatus, power supply, imager (if included)), power cords, and instruction manuals (reagents often NOT included - order separately). On-site installation, setup, and operator training ARE typically included or strongly recommended for complete systems, especially with imager and software (requires professional setup (imager calibration, software installation, network integration), and user training on workflow, imaging, quantitation, and maintenance; installation by manufacturer or certified technician is standard for imagers and automated systems). For basic electrophoresis/power supply: self-setup is feasible (unbox, assemble, use) but training on technique is recommended. Always verify power supply output and imager calibration before first use. Reagents (antibodies, gels, substrates) should be ordered and stored properly (antibodies -20 C, precast gels 4 C, ECL -20 C or 4 C).

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

A: The Western blotting system analyzes protein samples from various sources including cell lysates (cultured mammalian cells, bacterial cells, yeast), tissue lysates (animal/human tissues (frozen or FFPE - FFPE requires antigen retrieval/extraction), plant tissues), biological fluids (serum, plasma, urine, CSF, cell culture supernatant - may need concentration/depletion (albumin/IgG depletion for serum)), immunoprecipitates (IP/co-IP eluates), purified proteins, and subcellular fractions (nuclear, cytoplasmic, membrane fractions). NOT compatible with: Non-protein samples (nucleic acids (use Southern/Northern), small molecules (use LC-MS)), samples with very low protein concentration (may need concentration (ultrafiltration, TCA precipitation) or enrichment (IP)), samples with high lipid content (can interfere with gel running; delipidate or use appropriate lysis), degraded samples (autolyzed tissue, old samples - use protease inhibitors, work fast, check integrity), samples requiring native (non-denaturing) conditions (standard SDS-PAGE is denaturing; use native PAGE for protein complexes/activity - different buffer system, no SDS/reducing agent), and samples with proteins outside gel range (very large >300 kDa (use low-percentage gel, gradient, or agarose gel) or very small <5 kDa (use high-percentage gel, tricine gel, or other methods)). For phosphorylated proteins: use phosphatase inhibitors in lysis buffer, BSA blocking (not milk), phospho-specific antibodies. For glycosylated proteins: may see smeared bands (heterogeneous glycosylation) - use deglycosylation (PNGase F) if needed. For quantitative comparison: ensure equal protein loading (BCA/Bradford), use loading controls, same exposure, technical replicates. IMPORTANT: Western blotting system fundamentals: (1) What is Western blot? A technique to detect specific proteins in complex samples. Combines: - SDS-PAGE: Separate proteins by molecular weight (denatured, coated with SDS (-), migrate toward anode (+)). - Transfer: Move proteins from gel to membrane (PVDF or nitrocellulose) via electric current. - Immunodetection: Probe membrane with target-specific primary antibody, then labeled secondary antibody, detect signal. (2) Key steps and tips: - Sample prep: Lyse with protease/phosphatase inhibitors, quantify (BCA/Bradford), equalize, denature (SDS + reducing agent + heat). - Gel percentage: 8% for large proteins (>100 kDa), 10-12% for medium (30-100 kDa), 15% for small (<30 kDa). Gradient gels (4-20%) for wide range. - Transfer: Wet (reliable, all sizes) vs semi-dry (fast). PVDF needs methanol activation. No bubbles. - Blocking: Milk (cheap, general) or BSA (for phospho, cleaner). 1h RT or ON 4C. - Primary antibody: Dilute per datasheet, optimize. ON 4C often better than 1h RT. - Secondary: HRP (chemiluminescence) or fluorophore (fluorescence). Match species. - Detection: ECL (most common, sensitive) or fluorescence (multiplex, quantitative). - Normalization: Loading control (actin, GAPDH, tubulin) or total protein stain (Ponceau, Revert - more reliable). (3) Common problems and fixes: - No signal: Check transfer (orientation, bubbles, time), antibody (concentration, validity), protein expression (positive control), substrate (fresh). - High background: Increase blocking, dilute antibody, more washes, don not let membrane dry. - Non-specific bands: Higher antibody dilution, more stringent wash, different antibody. - Smiling/smearing: Reduce voltage, reduce load, fresh buffer, proper denaturation. - Weak signal: Load more protein, increase antibody, longer exposure, fresh substrate. (4) Quantitation best practices: - Use same gel for comparison (run all samples together). - Same exposure time (within linear range of detector). - Technical replicates (n>=3). - Normalize to total protein (preferred over housekeeping gene, which can vary). - Use fluorescent or chemiluminescence with CCD (not film, which is non-linear). - Follow journal guidelines (many require uncropped blots, quantitation methods). (5) Choosing the right system: - Basic lab: Electrophoresis + power supply + transfer + basic imager (or film processor). - Quantitative/high-throughput: Fluorescence imager (multiplex) + automated processor + software. - Chemiluminescence: CCD imager (better than film, linear range, digital). - Fluorescence: Multiplex (2-5 proteins simultaneously), more stable, more quantitative. - Mini vs large: Mini (fast, small samples) vs large (high resolution, many samples). - Budget: Components can be purchased separately (mix brands) but integrated systems offer compatibility/support. (6) Safety: - High voltage power supply (shock risk). - Acrylamide (neurotoxic when unpolymerized). - beta-ME, methanol (toxic/flammable - fume hood). - ECL (hazardous chemicals). - Clinical samples (BSL-2, PPE). (7) This is a multi-component system. The "Features + FAQ" covers the integrated workflow. Individual components (power supply, electrophoresis unit, imager) have their own specs but are used together in the Western blot workflow.