Description
Phosphorylated Chitosan — Soldier Fly Origin | Bone, Wound & Water Treatment Grade
Water-Soluble Phosphate Derivative | DS 0.2–0.7 Available | Calcium-Binding | Antioxidant | Hermetia illucens Source | COA Included
Phosphorylated Chitosan is a water-soluble, multifunctional chitosan derivative produced by introducing phosphate ester groups onto the chitosan backbone. This single chemical modification transforms chitosan’s biological profile: it gains strong calcium- and metal-binding capacity, enhanced antioxidant activity, broad-spectrum antibacterial performance, and critically for biomedical researchers the ability to nucleate apatite-like mineral formation, the foundation of its use in bone regeneration and dental biomaterials research. Our Phosphorylated Chitosan is produced from Hermetia illucens (Black Soldier Fly) sourced chitosan, a sustainable, circular-economy insect chitin source. Available in research samples (25 g) through industrial bulk (1 ton+), with full Certificate of Analysis (COA) and MSDS per batch.
What Is Phosphorylated Chitosan? The Chemistry Explained
Phosphorylated chitosan is produced by reacting chitosan with phosphorus-containing reagents to graft phosphate (or phosphonate) groups onto the polymer backbone. Published synthesis literature describes three principal reaction routes, each producing a structurally distinct product:
- H₃PO₄ / urea route: phosphoric acid with urea as catalyst amino group (C-2) substitution is favored
- H₃PO₄ / Et₃PO₄ / P₂O₅ route: a mixed phosphoric acid/triethyl phosphate/phosphorus pentoxide system also favors amino group substitution
- P₂O₅ / CH₃SO₃H (methanesulfonic acid) route: the amino groups are protected by ionic binding with methanesulfonic acid, directing phosphorylation specifically to the C-6 primary hydroxyl group this route is widely used to produce the most extensively characterized ‘chitosan phosphate’ form
The choice of synthesis route determines exactly where phosphate groups attach C-2 (amino), C-3 (secondary hydroxyl), or C-6 (primary hydroxyl) which in turn affects solubility behavior, charge profile, and biological activity. The defining quality parameter across all routes is Degree of Substitution (DS): the proportion of available reactive sites that have been successfully phosphorylated, typically reported as a decimal (e.g., DS 0.20, DS 0.50, DS 0.70) or as phosphorus content (wt%) via elemental or X-ray photoelectron spectroscopy (XPS) analysis.
DS is not a minor technical footnote published research demonstrates it directly determines product behavior:
- Low DS (≈0.1–0.3): Capable of self-assembling into nanoparticles — relevant for drug delivery carrier research
- Moderate DS (≈0.3–0.5): Fully water-soluble — the most commonly supplied form for biomedical and industrial use
- High DS (≈0.6–0.7+): Soluble in both water and organic solvents (e.g., toluene); shows the strongest antioxidant and antibacterial activity of the three ranges, with published data showing antioxidant performance comparable to ascorbic acid at DS 0.70
We offer DS 0.2–0.7 as standard, with custom DS specification available for research and pharmaceutical-grade orders — confirm your target DS at time of inquiry.
Compare to other water-soluble derivatives: Chitosan Hydrochloride — Water-Soluble Salt Form
Full Technical Specifications
| Parameter | Specification |
| Product Name | Phosphorylated Chitosan (Chitosan Phosphate Derivative) |
| Synonyms | Chitosan Phosphate; P-Chitosan; Phosphate-Functionalized Chitosan |
| Source | Hermetia illucens (Black Soldier Fly) insect-origin chitosan |
| Degree of Substitution (DS) | 0.2 – 0.7 standard range custom DS available on request |
| Substitution Site | C-6 hydroxyl (standard route) C-2/C-3 substitution available via alternate synthesis on request |
| Water Solubility | Fully water-soluble at moderate DS; dual water/organic solubility at high DS |
| Appearance | Off-white to pale yellow powder |
| Parent Chitosan DDA | ≥ 85% (pre-phosphorylation) |
| Characterization | FTIR and elemental/XPS phosphorus content confirmation per batch; ¹H-NMR / ³¹P-NMR available for pharmaceutical-grade orders |
| Key Functional Groups | Phosphate ester (-OPO₃H₂) grafted to chitosan backbone |
| Bioactivity Profile | Calcium/metal chelating, antioxidant, antibacterial, osteoconductive support |
| Grade Options | Industrial | Research/R&D | Cosmeceutical |
| Documentation | COA | MSDS/SDS available per batch |
The Science: How Phosphate Groups Transform Chitosan’s Bioactivity
1. Calcium Binding & Apatite Nucleation — The Bone Regeneration Mechanism
The phosphate ester groups on phosphorylated chitosan closely mimic the function of phosphoserine and other phosphorylated proteins found naturally in bone extracellular matrix, such as osteopontin. Published bone-regeneration research demonstrates that phosphorylated biomaterials can catalyze the nucleation of apatite crystals the calcium phosphate mineral that forms the structural basis of bone tissue. While standard chitosan is biocompatible and biodegradable, it is not inherently osteoinductive on its own; phosphorylation is one of the modification strategies researchers use to add this missing bioactive function.
In published animal studies, phosphorylated chitosan (P-chitosan) combined with calcium phosphate cement and implanted into rabbit bone defects supported stabilization of the defect site and showed progressively improving bone formation on radiographs across a 22-week observation period, with implant biodegradation occurring alongside new bone growth outperforming unmodified controls in healing trajectory.
2. Antioxidant Mechanism
Phosphorylated chitosan’s antioxidant activity has been characterized through standard in vitro assays in the literature, including Fe³⁺ reducing power, hydroxyl radical scavenging, DPPH radical scavenging, and inhibition of lipid peroxidation. The mechanism is attributed to two combined effects: the phosphate groups’ metal-chelating capacity (sequestering pro-oxidant metal ions such as Fe²⁺/Fe³⁺ that catalyze oxidative reactions) and the electron-donating capacity of the modified polymer backbone. Notably, published research on highly substituted phosphorylated chitosan (DS ≈0.70) reports antioxidant activity comparable to ascorbic acid (vitamin C) a benchmark natural antioxidant.
3. Antibacterial Activity
Phosphorylated chitosan demonstrates antibacterial activity that increases with degree of substitution. Published in vivo research on highly substituted phosphorylated chitosan reports antibacterial effects more pronounced than the commercial antibiotics ampicillin and gentamicin in tested models, with no observed acute or subacute toxicity a notable safety and efficacy combination for a bio-based material.
4. Wound Healing — Diabetic Wound Model Evidence
In a published diabetic wound healing study, phosphorylated chitosan-treated excisional wounds in a diabetic rat model achieved 91.11% wound contraction by day 14, compared to 67.26% in untreated controls. Histopathological analysis showed improved tissue morphology, a thicker epithelial layer, higher fibroblast counts, enhanced collagen deposition, and increased angiogenesis in treated wounds. Biochemical markers showed a 57% increase in hydroxyproline and 25% increase in hexosamine content versus untreated wounds, alongside significantly increased superoxide dismutase (SOD) activity and decreased lipid peroxide levels consistent with the antioxidant mechanism described above contributing directly to accelerated healing.
Related wound care application: Carboxymethyl Chitosan — Hydrogel & Wound Care Derivative
Applications: Where Phosphorylated Chitosan Delivers Measurable Results
Bone Regeneration & Orthopedic Biomaterials
Phosphorylated chitosan is researched as a functional additive for calcium phosphate bone cements and as a component in composite bone scaffolds. Its phosphate groups support mineral nucleation and integration with the bone repair environment, while its inherent biodegradability allows the material to resorb as new bone tissue forms. Research applications include:
- Additive for injectable and moldable calcium phosphate bone cements
- Composite scaffold component alongside hydroxyapatite or other calcium phosphate ceramics
- Coating layer to improve osteoblast adhesion on implant surfaces
- Bone defect filler research in combination with growth factors or stem cell delivery systems
Related biomedical polymer: Quaternary Chitosan — Permanently Cationic Biomedical Polymer
Dental Materials & Coatings
The same calcium-binding and osteoconductive-support mechanism that benefits bone regeneration research extends to dental material applications, where phosphorylated chitosan is studied as a coating or additive supporting:
- Dental cement and restorative material modification
- Remineralization-supporting coatings for early-stage demineralized enamel research
- Antibacterial dental material additive leveraging the antibacterial mechanism described above against oral pathogens
Wound Care & Tissue Regeneration
Building on the published diabetic wound healing data, phosphorylated chitosan is used in research-stage wound care formulations including:
- Hydrogel and film-forming wound dressings
- Chronic and diabetic wound care research formulations
- Combination formulations with growth factors or antimicrobial actives
Water Treatment & Industrial Chelation
Phosphorylated chitosan’s strong calcium- and metal-binding capacity makes it useful as a chelating agent in water treatment and industrial process chemistry:
- Heavy metal ion binding and removal (Cu²⁺, Pb²⁺, Cd²⁺, Fe³⁺) from aqueous waste streams
- Calcium sequestration in hard water and scale-control applications
- Complementary flocculation activity alongside standard cationic chitosan flocculants
Full water treatment application guide: Sustainable Water Treatment with Chitosan — Applications & Dosage
Industrial Catalysis
Highly substituted phosphorylated chitosan (DS ≈0.7) has been documented in published research as an effective homogeneous catalyst demonstrating approximately 100% yield in model monoglyceride synthesis reactions within 3 hours. This positions high-DS phosphorylated chitosan as a green chemistry catalyst alternative for esterification and related industrial reactions, an underexplored B2B application beyond biomedical use.
Cosmeceutical & Personal Care Formulations
In cosmetic formulation research, phosphorylated chitosan’s antioxidant activity, mineral-binding capacity, and film-forming properties are studied for:
- Anti-aging formulations leveraging antioxidant/free-radical scavenging activity
- Mineral-fortifying skincare claims (calcium-binding capacity)
- Film-forming conditioning agent in hair and skin care formulations
Cosmetics application depth: Chitosan in Cosmetics — Green Beauty Formulation Guide
Phosphorylated Chitosan vs. Standard Chitosan vs. Carboxymethyl Chitosan
| Property | Phosphorylated Chitosan | Standard Chitosan | CMC |
| Functional Group | Phosphate ester | Free amine | Carboxymethyl |
| Water Solubility | Full (moderate–high DS) | Acid only (pH <6.5) | Wide pH |
| Calcium/Metal Binding | Strong phosphate chelation | Moderate (amine chelation) | Moderate (carboxyl chelation) |
| Antioxidant Activity | Strong comparable to ascorbic acid at high DS | Mild | Moderate |
| Osteoconductive Support | Yes, documented apatite nucleation support | No inherent osteoinductivity | Limited |
| Antibacterial Activity | Strong, DS-dependent | Moderate (pH-dependent) | Mild |
| Best Use Cases | Bone/dental biomaterials, wound healing, water treatment, catalysis | Agriculture, food, general flocculation | Cosmetics, wound hydrogels |
Insect-Origin Sourcing — Why Black Soldier Fly Chitosan?
Our phosphorylated chitosan begins with chitosan derived from Hermetia illucens (Black Soldier Fly) larvae an insect chitin source increasingly favored across biomedical and industrial supply chains for its consistency and sustainability profile:
- Circular economy sourcing: BSF larvae are reared on organic waste streams, converting low-value biomass into high-value chitin
- Reduced supply variability versus seasonal crustacean shell availability
- Comparable molecular characteristics to crustacean-derived chitosan for most industrial and research applications
- Lower environmental footprint relative to traditional shellfish processing waste streams
If your formulation or regulatory pathway specifically requires shellfish-derived or mushroom-derived (fully vegan) phosphorylated chitosan instead, contact us we can discuss custom sourcing for qualifying bulk orders.
Learn about insect-origin chitosan: Insect-Origin Chitosan — Sourcing & Sustainability
Compare all chitosan source origins: Types of Chitosan — Full Source & Derivative Range
Pricing, Packaging & Ordering
| Quantity | Price (USD) | Shipping (USA) | Notes |
| 25 g Sample | $65.00 | Free | In stock; ideal for assay/formulation screening |
| 1 kg | $180/kg | 15% tariff + $60 FedEx | Standard DS 0.2–0.5 grade |
| 100 kg – 500 kg | $160/kg | Custom quote | Volume pricing; custom DS available |
| 500 kg – 1 Ton | Contact for quote | Custom quote | Industrial bulk; lead time 4–12 weeks |
For custom degree of substitution, alternate synthesis route (C-2 amino substitution vs C-6 hydroxyl), or pharmaceutical-grade documentation requirements, contact steve@chitosanglobal.com with your formulation specifications.
Full wholesale and bulk pricing: Chitosan Global Wholesale Pricing — All Products
Documentation & Quality Control
- Certificate of Analysis (COA): provided per batch confirms phosphorus content, appearance, solubility, and DS range
- MSDS / SDS: available for safety and regulatory compliance
- Technical Data Sheet (TDS): formulation guidance, handling, and storage procedures
- Batch traceability: every batch traceable to source insect-chitosan lot
- Characterization on request: FTIR confirmation standard; ¹H-NMR/³¹P-NMR and XPS phosphorus quantification available for pharmaceutical-grade and research orders
Download current batch COA: Get COA
Why Source Phosphorylated Chitosan from Chitosan Global?
- Sustainable insect-origin sourcing — Hermetia illucens chitosan supports circular-economy procurement goals
- Transparent bulk pricing published openly — from 25 g research samples to 1-ton industrial orders
- Custom DS specification available — matched to your specific bone, wound, water treatment, or catalysis application
- Full documentation: COA, MSDS, and TDS per batch, with advanced characterization available for qualifying orders
- Direct technical support — discuss synthesis route, DS%, and application fit with our team before you commit to bulk volume
Our supply chain approach: Responsible Supply Chain & Sustainability Policy
Frequently Asked Questions
What is phosphorylated chitosan?
Phosphorylated chitosan is a water-soluble chitosan derivative produced by grafting phosphate ester groups onto the chitosan polymer backbone. This modification gives it strong calcium- and metal-binding capacity, enhanced antioxidant and antibacterial activity, and the ability to support apatite (bone mineral) nucleation properties standard chitosan does not have on its own.
How is phosphorylated chitosan made?
Three main synthesis routes are documented in scientific literature: reaction with phosphoric acid and urea, reaction with a phosphoric acid/triethyl phosphate/phosphorus pentoxide mixture (both of which favor substitution at the C-2 amino group), or reaction with phosphorus pentoxide and methanesulfonic acid, which protects the amino groups and directs phosphorylation to the C-6 hydroxyl group. The synthesis route used determines the substitution site and resulting product properties.
What is degree of substitution (DS) and why does it matter?
Degree of substitution (DS) is the proportion of chitosan’s available reactive sites that have been successfully phosphorylated, typically expressed as a decimal between 0 and 1 (e.g., DS 0.20, DS 0.50, DS 0.70). DS directly determines product behavior: low DS material can self-assemble into nanoparticles, moderate DS is fully water-soluble, and high DS material is soluble in both water and organic solvents while showing the strongest antioxidant and antibacterial activity. Always confirm the DS range when sourcing phosphorylated chitosan for a specific application.
Is phosphorylated chitosan water soluble?
Yes, at moderate to high degrees of substitution. Unlike standard chitosan, which requires acidic conditions (pH below ~6.5) for solubility, phosphorylated chitosan’s phosphate groups confer water solubility across a wider pH range, making it suitable for neutral-pH biomedical and industrial formulations where standard chitosan is not viable.
What is phosphorylated chitosan used for in bone regeneration?
Phosphorylated chitosan is researched as a functional additive in calcium phosphate bone cements and composite bone scaffolds. Its phosphate groups mimic naturally phosphorylated bone matrix proteins and support apatite crystal nucleation. Published animal studies show phosphorylated chitosan-containing bone cement implants support stable bone defect healing over time, with progressive new bone formation observed on radiographs.
Does phosphorylated chitosan help with wound healing?
Published research in a diabetic rat wound model found that phosphorylated chitosan treatment achieved 91.11% wound contraction by day 14 versus 67.26% in untreated controls, with improved tissue morphology, increased fibroblast counts, enhanced collagen deposition, and increased angiogenesis. The effect is linked to the material’s antioxidant activity, which reduces oxidative stress markers that impair healing in diabetic wounds.
Is phosphorylated chitosan antibacterial?
Yes. Published research shows phosphorylated chitosan exhibits antibacterial activity that increases with degree of substitution. Highly substituted phosphorylated chitosan has demonstrated in vivo antibacterial effects reported as more pronounced than the antibiotics ampicillin and gentamicin in tested models, without observed acute toxicity.
Does phosphorylated chitosan have antioxidant properties?
Yes. Phosphorylated chitosan’s antioxidant activity has been demonstrated through Fe³⁺ reducing power, hydroxyl and DPPH radical scavenging, and lipid peroxidation inhibition assays. At high degrees of substitution (DS ≈0.70), published research reports antioxidant activity comparable to ascorbic acid (vitamin C).
What is the difference between phosphorylated chitosan and carboxymethyl chitosan?
Both are water-soluble anionic-leaning chitosan derivatives, but they differ in functional group and primary application strength. Phosphorylated chitosan carries phosphate ester groups, giving it strong calcium-binding and osteoconductive-support properties suited to bone and dental research. Carboxymethyl chitosan (CMC) carries carboxymethyl groups and is more commonly used in hydrogel, wound dressing, and cosmetic film-forming applications. Selection depends on whether calcium/mineral interaction (phosphorylated) or general hydrogel/film-forming performance (CMC) is the priority.
Can phosphorylated chitosan be used in water treatment?
Yes. Its phosphate groups provide strong chelation capacity for calcium and heavy metal ions (such as copper, lead, cadmium, and iron), making it useful in water treatment and industrial process streams requiring metal ion removal or water hardness management, often as a complement to standard cationic chitosan flocculants.
What source is your phosphorylated chitosan derived from?
Our standard phosphorylated chitosan is produced from chitosan sourced from Hermetia illucens (Black Soldier Fly) larvae a sustainable, circular-economy insect chitin source reared on organic waste streams. If your application requires shellfish-derived or mushroom-derived (fully vegan) sourcing instead, contact us to discuss custom sourcing for qualifying orders.
Can phosphorylated chitosan be used as a catalyst?
Highly substituted phosphorylated chitosan (DS approximately 0.70) has been documented in published research as an effective homogeneous catalyst, achieving near-complete yield in model esterification (monoglyceride synthesis) reactions. This is an emerging industrial chemistry application beyond its established biomedical uses.
What characterization methods confirm successful phosphorylation?
Standard analytical methods used in the scientific literature include FTIR spectroscopy (confirms phosphate group presence via characteristic absorption bands), ¹H-NMR and ³¹P-NMR spectroscopy (confirm substitution pattern and quantify DS), and X-ray photoelectron spectroscopy or elemental analysis (quantify phosphorus content as weight percent). We provide FTIR confirmation standard with every batch COA, with NMR and XPS data available for pharmaceutical-grade and research orders.
Is phosphorylated chitosan suitable for dental applications?
Yes. Researchers are studying phosphorylated chitosan in dental cement modification, remineralization-supporting coatings, and antibacterial dental material additives, leveraging the same calcium-binding and antibacterial mechanisms relevant to its bone regeneration applications.
What grades are available and what is the minimum order quantity?
Standard DS 0.2–0.7 grade is available with industrial, research/R&D, and cosmeceutical grade options. Minimum order is a 25 g research sample at $65 with free USA shipping. Standard 1 kg units are $180/kg, with bulk industrial pricing available from 100 kg through 1 metric ton. Custom DS specification is available for qualifying orders.
How should phosphorylated chitosan be stored?
Store in a sealed container at room temperature, protected from moisture and direct sunlight. Properly stored powder maintains stability for extended periods; reconstituted aqueous solutions should be freshly prepared or refrigerated and used within a defined timeframe to maintain bioactivity. Full storage guidance is included in the Technical Data Sheet provided with each order.
Does phosphorylated chitosan replace synthetic bone graft materials?
Phosphorylated chitosan is studied as a functional additive within composite bone biomaterial systems (such as calcium phosphate cements) rather than as a standalone graft replacement. Its role is to support apatite nucleation, improve handling/setting properties of the cement, and contribute biodegradability and biocompatibility to the composite system. Application-specific research validation is recommended for any biomedical development program.
What documentation is provided with each order?
Every batch ships with a Certificate of Analysis (COA) confirming phosphorus content/DS range, appearance, and solubility. MSDS/SDS and a Technical Data Sheet (TDS) are available on request. Advanced characterization (NMR, XPS) is available for pharmaceutical-grade and research orders. contact us to specify your documentation requirements before ordering.
Related Products & Resources
→ Trimethyl Chitosan — Soldier Fly Source (Permanently Cationic)
→ Quaternary Chitosan — All Grades & Sources
→ Carboxymethyl Chitosan (CMC) — Anionic Derivative for Hydrogels
→ Chitosan Oligosaccharide (COS) — Low MW Bioactive Polymer
→ Chitosan Hydrochloride — Water-Soluble Chitosan Salt
→ Insect-Origin Chitosan — Hermetia illucens Source
→ Chitosan for Water Treatment — Applications & Dosage
→ Chitosan in Cosmetics — Green Beauty Applications
Order Phosphorylated Chitosan or Request a Custom Specification
Select your package above to add to cart, or contact us to discuss custom degree of substitution, alternate synthesis route, or pharmaceutical-grade documentation requirements.
Email: steve@chitosanglobal.com | Phone: +1 423-202-6145
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