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| Product Name | Silver Stain Kit for SDS-PAGE Gels, Mass Spectrometry Compatible, High Sensitivity |
| Catalog No. | PTR-HMM-0091 |
| Description | High-sensitivity silver staining kit for protein detection in sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) gels, formulated for mass spectrometry compatibility. The kit detects as little as 0.1-0.5 ng of protein per band (approximately 10-50x more sensitive than Coomassie Brilliant Blue R-250), making it the method of choice for detecting low-abundance proteins in complex samples, verifying purity of recombinant proteins, and visualizing protein profiles before band excision for proteomics. The mass spectrometry-compatible formulation omits glutaraldehyde and uses a modified sensitization step to minimize protein cross-linking and lysine modification, enabling successful peptide mass fingerprinting (PMF) and tandem mass spectrometry (MS/MS) from excised bands. The protocol uses formaldehyde-based silver ion reduction and includes all necessary solutions in ready-to-use or easily reconstituted formats. |
| Intended Use | Ultrasensitive protein detection in SDS-PAGE gels for: visualization of low-abundance proteins (<10 ng/band); purity assessment of recombinant protein preparations; protein profiling from limited samples (laser capture microdissection, FACS-sorted cells); quality control of IP and pull-down experiments; protein band visualization prior to excision for in-gel tryptic digestion and mass spectrometry (MALDI-TOF PMF, LC-MS/MS); and 2D-PAGE spot detection and quantitation. |
| Principle / Technology | The silver staining process involves: (1) Fixation — proteins immobilized in gel matrix, interfering substances (SDS, glycine, Tris) removed; (2) Sensitization — gel treated with sensitizing agent (sodium thiosulfate or similar) that enhances silver deposition specificity; (3) Silver impregnation — silver nitrate or ammoniacal silver binds to proteins; (4) Development — formaldehyde reduces silver ions to metallic silver on protein bands, producing brown-black bands; (5) Stop — acetic acid or EDTA stops development. The MS-compatible version omits glutaraldehyde and uses reduced formaldehyde concentration to minimize protein modification while retaining sensitivity. |
| Detection Method | 1) Fixation: incubate gel in Fixing Solution for 30 min (or overnight); 2) Wash: 2x 10 min in 50% ethanol or water; 3) Sensitization: incubate in Sensitizing Solution for 1-2 min; 4) Wash: 2x 1 min in water; 5) Silver Impregnation: incubate in Silver Solution for 20-30 min; 6) Rinse: brief water rinse; 7) Development: incubate in Developing Solution until desired band intensity (2-10 min); 8) Stop: transfer to Stop Solution for 10 min; 9) Wash: water wash, store gel in water or 1% acetic acid. Total protocol time approximately 1.5-2.5 hours. |
| Sample Type | Proteins separated by 1D or 2D SDS-PAGE (gel thickness 0.75-1.5 mm); compatible with Tris-glycine, Tris-tricine, and Bis-Tris gel systems; protein loading: 0.1-500 ng per band optimal detection range; gels must be fixed immediately after electrophoresis. |
| Performance Range / Specifications | Sensitivity: 0.1-0.5 ng protein per band (depending on protein — phosphoproteins, glycoproteins may stain less intensely); linear dynamic range: approximately 10-40 fold (silver stain is semi-quantitative); band color: dark brown to black on light yellow-brown to clear background; MS compatibility: >80% sequence coverage typically achieved from 10-50 ng protein bands. |
| Sensitivity / LOD | Detection limit: 0.1-0.5 ng protein per band (BSA standard); approximately 50-100x more sensitive than Coomassie R-250, 5-10x more sensitive than colloidal Coomassie G-250; capable of detecting proteins at sub-femtomole levels for average 50 kDa protein. |
| Specificity | Silver ions bind to proteins primarily through: carboxyl groups (Asp, Glu), sulfhydryl groups (Cys), amino groups (Lys), and imidazole groups (His); glycoproteins stain poorly due to steric hindrance of glycosylation; highly acidic proteins may stain lightly; formaldehyde reduction of silver to metallic silver occurs preferentially at protein-bound silver sites. |
| Reaction Conditions / Protocol | Fixation: 30 min minimum (overnight acceptable); sensitization: 1-2 min (critical step — over-sensitization increases background); silver impregnation: 20-30 min; development: 2-10 min (monitor visually); stop: 10 min; total time: 1.5-2.5 hours. |
| Components / Formulation | Fixing Solution (500 mL, 40% ethanol, 10% acetic acid), Sensitizing Solution (lyophilized, make 100 mL), Silver Solution (lyophilized, make 100 mL), Developing Solution A (100 mL concentrate), Developing Solution B (formaldehyde, 1 mL), Stop Solution (5% acetic acid, 500 mL), Protocol, Staining Trays. |
| Storage Conditions | Fixing Solution and Stop Solution at RT; lyophilized Sensitizing and Silver solutions at RT desiccated; Developing Solution A at 2-8 C; Developing Solution B at RT (flammable, keep away from heat); reconstituted solutions: Silver Solution stable 1 week at 2-8 C in dark; Sensitizing Solution use same day. |
| Shelf Life | 12 months from date of manufacture; lyophilized reagents: 24 months at RT desiccated. |
| Package Specifications | 1 kit (sufficient for approximately 20 mini-gels, 8 x 10 cm, 1.0 mm thick). |
| Product Form | Liquid fixing, stop, and developing solutions; lyophilized sensitizing and silver solutions. |
| Quality Control | Each lot tested with: E. coli protein extract (50 ng-5 ug loaded, 10% SDS-PAGE): detection of bands at 0.5 ng level; background: clear to very light tan; MS compatibility: tryptic digest of 50 ng BSA band yields >70% sequence coverage by MALDI-TOF PMF; sensitivity confirmed against commercial silver stain standard. |
| Key Features | MS-compatible formulation (no glutaraldehyde); 0.1-0.5 ng sensitivity; 50-100x more sensitive than Coomassie; all reagents provided; ready-to-use fixing and stop solutions; comprehensive protocol; suitable for 1D and 2D gels. |
| Purity | All chemicals: analytical grade or higher; silver nitrate: ACS grade; formaldehyde: 37% solution, ACS grade; water: ultrapure (18.2 MOhm-cm); solutions prepared fresh or reconstituted as specified. |
| Concentration | Silver Solution: approximately 0.1-0.2% silver nitrate; Sensitizing Solution: approximately 0.02% sodium thiosulfate; Developer: approximately 2-3% potassium carbonate with 0.02-0.05% formaldehyde. |
| Activity / Unit Definition | Silver staining sensitivity verified by detection of protein markers at specified levels. |
| Molecular Weight | Silver nitrate: 169.87 g/mol; sodium thiosulfate pentahydrate: 248.18 g/mol; formaldehyde: 30.03 g/mol. |
| Source / Origin | All chemicals synthetic; silver nitrate from refined silver; no animal-derived components. |
| pH Range / Optimal pH | Fixing solution pH ~2-3 (acidic); silver solution pH ~6-7; developing solution pH ~11-12 (alkaline for formaldehyde reduction); stop solution pH ~2-3. |
| Shipping Conditions | Ambient temperature for most components; cold pack may be included for Developing Solution A; formaldehyde (Developing Solution B) ships via ground as hazardous material in some regions. |
| Expiration Date / Stability | 12 months overall; lyophilized reagents 24 months; reconstituted silver solution 1 week at 2-8 C in dark; developing solution prepare fresh for each use. |
| Regulatory / Compliance | For research use only; not for diagnostic or therapeutic use. Contains formaldehyde (known carcinogen) and silver nitrate (oxidizer, stains skin) — use appropriate PPE (gloves, lab coat, eye protection) and work in a chemical fume hood when handling developing solution. |
| Compatibility | Compatible with 1D and 2D SDS-PAGE gels (Tris-glycine, Tris-tricine, Bis-Tris, native PAGE with SDS). Compatible with gel drying between cellophane sheets for permanent record. MS-compatible: bands excised, destained (potassium ferricyanide/sodium thiosulfate method recommended for silver destaining), trypsin-digested, and analyzed by MALDI-TOF or LC-MS/MS. Not compatible with: gels containing PEG or other silver-reducing contaminants; equipment with residual protein contamination (always use clean, dedicated staining trays for silver staining — do not reuse Coomassie-stained trays without thorough cleaning). |
| Recommended Buffer System | Fixing Solution: 40% ethanol, 10% acetic acid; Stop Solution: 5% acetic acid; storage: gels in 1% acetic acid or water. |
| Application Notes / Precautions | Wear powder-free gloves throughout the procedure (fingerprint proteins will stain). Use clean, dedicated glass or polypropylene trays — never polystyrene (will stain). All water used must be ultrapure (18.2 MOhm-cm); contaminants in water cause high background. The sensitization step is the most critical: 1-2 minutes exactly; longer times increase background dramatically. During development, watch the gel carefully and stop when desired band intensity is reached — overdevelopment cannot be reversed and results in high background. For MS analysis: after staining, excise bands immediately, destain with 15 mM potassium ferricyanide/50 mM sodium thiosulfate until clear, wash extensively with water, and proceed with in-gel trypsin digestion. Silver-stained bands are compatible with MS analysis without the need for additional fixation. For glycoproteins, a PAS-silver dual staining may enhance detection. |
| Batch-to-Batch Consistency | Sensitivity: detection at 0.5 ng BSA confirmed for every lot; MS compatibility: >70% BSA sequence coverage verified; background: clear after standard development time. |
For research use only, not for clinical use.
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