Fluorescein (CAS 2321-07-5) Comprehensive Guide
Table of Contents
- Product Specifications & Comparative Analysis
- Functional Applications
- Practical Use Cases
- Industry-Specific Case Studies
- Client Success Stories
- Technical Consultation & Inquiry
Product Specifications & Comparative Analysis
| Parameter | Fluorescein | Fluorescein-5-thiosemicarbazide | FITC-Angiopep-2 |
|---|---|---|---|
| CAS Number | 2321-07-5 | 76863-28-0 | N/A |
| Molecular Formula | C20H12O5 | C21H15N3O5S | Conjugated compound |
| Molecular Weight | 332.31 g/mol | 421.43 g/mol | Variable |
| Excitation/Emission | 490 nm / 520 nm | 492 nm / 516 nm | 490 nm / 520 nm |
| Key Applications | Biological staining, redox indicator | Protein labeling, cell surface analysis | Blood-brain barrier studies |
Functional Applications
Core Utilities:
- Biochemical Tracing: Serves as fluorescent tracer in metabolic studies with detection limits ≤1 μM
- Clinical Diagnostics: FDA-approved for retinal angiography (0.1-0.5 mg/kg intravenous dosage)
- Industrial Sensing: Quantitative analysis of halides (Cl–, Br–, I–) with 90-95% accuracy
Practical Use Cases
Advanced Implementations:
- Neuroscience Research: FITC-Angiopep-2 conjugates enable real-time BBB permeability analysis (12-15% increased uptake efficiency)
- Cancer Diagnostics: LTL-Fluorescein probes detect α-L-fucose residues in tumor glycoproteins (85% specificity)
- Membrane Studies: Fluorescein-5-thiosemicarbazide labels erythrocyte glycophorins with ≤5 nm spatial resolution
Industry-Specific Case Studies
Pharmaceutical Development:
- Monitored drug conjugate distribution using PEG-Fluorescein tags (t1/2 increased by 40%)
- Quantified nanoparticle uptake kinetics with FITC-chitosan markers (R2 = 0.96 in linear regression)
Client Success Stories
Case 1: Shaanxi New Research Boomer Biotechnology
- Application: LTL-Fluorescein for glycoprotein mapping
- Result: Achieved 92% binding efficiency to α-L-fucose residues
- Scale: 50mg batch production with ≤2% impurity
Case 2: Xi’an Kaixin Biotech
- Application: Fluorescein-5-thiosemicarbazide for enzyme activity assays
- Result: 15% increase in detection sensitivity compared to conventional markers
- Throughput: 500+ samples/day processing capacity
Technical Consultation & Inquiry
For formulation optimization, bulk pricing (≥100g orders), or custom conjugation services:
Email: info@vivalr.com
Tel: (86) 15866781826
Submit technical requirements for:
- PEGylated derivatives (2kDa-40kDa)
- Cold chain logistics (-20°C to -80°C storage solutions)
- GMP-grade production (ISO 9001 certified facilities)



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