Description

What Is Phosphorylated Chitosan?

Phosphorylated chitosan (P-chitosan) is a chemically modified derivative of chitosan in which phosphate groups (–OPO₃H₂ or –NHPO₃H₂) are covalently grafted onto the polymer backbone primarily at the C6 hydroxyl position and the C2 amino group of the glucosamine repeat unit. This phosphorylation reaction fundamentally transforms the solubility, charge density, and bioactivity of the parent chitosan molecule.

Unlike standard chitosan, which dissolves only in dilute acidic solutions, phosphorylated chitosan achieves broad-spectrum water solubility at neutral to alkaline pH values (>6.5), making it far more versatile for pharmaceutical formulation, biomedical scaffolding, and industrial processing. At Chitosan Global, our P-chitosan is derived exclusively from the chitin-rich cell walls of sustainably cultivated mushrooms delivering a 100% vegan, shellfish-free, and allergen-conscious product for global manufacturers and research institutions.

Explore our full range of mushroom-derived chitosan derivatives:

trimethyl chitosan, carboxymethyl chitosan, quaternary chitosan, chitosan hydrochloride, and chitosan oligosaccharide

Mushroom Origin: Why Source Matters

Conventional chitosan is extracted from the exoskeletons of shrimp, crab, and lobster a process associated with allergen risks, religious (halal/kosher) restrictions, and supply chain volatility tied to seafood harvesting. Mushroom-derived chitosan eliminates all three concerns.

Our mushroom chitin is harvested from the mycelial cell walls of cultivated fungal biomass (principally Pleurotus ostreatus and related species), processed through an alkali deacetylation step to yield high-purity chitosan, and then selectively phosphorylated under controlled reaction conditions. The result is a traceable, sustainable, vegan-certified polymer with batch-to-batch consistency you can verify via our downloadable Certificate of Analysis (COA).

• 100% vegan and vegetarian — no animal-derived raw materials
• Shellfish-free — suitable for allergy-sensitive formulations and regulatory environments
• Halal and kosher compatible — expands global market reach for finished products
• Sustainably cultivated feedstock — lower environmental footprint versus crustacean sources
• Non-GMO mushroom substrate — traceable, clean-label supply chain

Learn more about our water-soluble chitosan supplier capabilities and our broader portfolio as a chitosan derivatives supplier.

The Chemistry of Phosphorylation

Phosphorylation modifies chitosan’s backbone through nucleophilic substitution or esterification reactions. The most common industrial synthesis routes use phosphorylating agents such as:

• H₃PO₄/P₂O₅/Et₃PO₄ in hexanol (Jayakumar method high DS, high yield)
• POCl₃ (phosphorus oxychloride) in alkaline conditions (selective C6 monophosphorylation)
• Methanesulfonic acid / phosphorus pentoxide system (water-soluble sodium salt formation)
• Kabachnik–Fields reaction with dimethyl phosphonate (α-aminophosphonate grafts)

The degree of substitution (DS) the average number of phosphate groups per glucosamine unit directly governs the product’s water solubility, antioxidant activity, and bioactivity. Published research confirms that P-chitosan with DS ≥ 0.70 exhibits antioxidant activity comparable to ascorbic acid, and highly substituted species demonstrate in vivo antibacterial activity superior to commercial antibiotics ampicillin and gentamicin (ScienceDirect, 2023).

At pH > 6.5, the phosphate groups exist in their deprotonated anionic form, creating a polyampholytic polymer with both positive (amino) and negative (phosphate) charge sites a property that makes P-chitosan exceptionally effective for metal ion chelation and biomolecular interactions.

Physicochemical Properties & Technical Specifications

Parameter	Specification	Test Method
Appearance	White to off-white powder	Visual inspection
Source	Mushroom (fungal mycelium Pleurotus spp.)	Supplier COA
Degree of Deacetylation (DDA)	≥ 75%	1H NMR / IR spectroscopy
Degree of Substitution (DS)	0.5 – 1.2 (customizable)	³¹P NMR / elemental analysis
Phosphorus Content	8 – 18 wt% (varies by DS)	Elemental analysis (ICP-OES)
Molecular Weight	50 – 300 kDa (customizable)	GPC / viscometry
Water Solubility	Soluble at pH 4 – 10 (neutral/alkaline-soluble)	USP dissolution test
Moisture Content	≤ 10%	Karl Fischer titration
Ash Content	≤ 2%	Gravimetric method
Heavy Metals (total)	< 20 ppm	ICP-MS
pH (1% aqueous solution)	6.0 – 8.0	pH meter
Viscosity (1%, 25°C)	10 – 200 mPa·s (grade-dependent)	Brookfield viscometer
Available Grades	Industrial, Pharmaceutical	COA per batch
Shelf Life	24 months from manufacture date	Accelerated stability testing
Storage Conditions	Cool, dry, < 25°C, away from direct light	GMP storage guidelines

Custom DS, molecular weight, and particle size are available for bulk orders. Contact steve@chitosanglobal.com to discuss your specific requirements.

Research-Backed Applications

1. Bone Regeneration & Orthopaedic Biomaterials

Phosphorylated chitosan has demonstrated remarkable performance in bone tissue engineering. When incorporated into calcium phosphate cements, P-chitosan acts as a bioactive additive that mimics the phosphorylated non-collagenous proteins (such as osteopontin) responsible for biomineralization. A landmark study showed P-chitosan cement implanted in rabbit bone defects produced complete wound healing without post-surgical complications, with X-ray confirmation of bone stabilization and correct positional maintenance across 1, 4, 12, and 22-week follow-up intervals (Sigma-Aldrich Technical Article, citing Ohya et al.).

Phosphoserine-loaded chitosan membranes a functionally analogous system have further demonstrated promotion of endogenous bone marrow mesenchymal stem cell infiltration, proliferation, and in situ osteogenic differentiation without any exogenous growth factors, confirmed by alkaline phosphatase (ALP) activity, immunofluorescence, and RT-qPCR (Frontiers in Bioengineering, 2023).

For hydrogel-based bone delivery systems, see our carboxymethyl chitosan for hydrogels page.

2. Drug Delivery & Controlled Release

P-chitosan’s combination of water solubility, mucoadhesive character, and pH-responsive charge makes it highly suitable for pharmaceutical drug delivery systems. Key advantages over unmodified chitosan include compatibility with neutral-pH drug formulations, prolonged mucosal residence time due to bioadhesion, and the ability to form stable polyelectrolyte complexes with anionic nucleic acids (gene delivery) and proteins.

Phosphorylated chitosan nanoparticles have been studied for oral, nasal, transdermal, and parenteral delivery routes. The dual-functional (amino + phosphate) groups allow tunable drug loading through both electrostatic interactions and covalent conjugation. See our comprehensive overview of chitosan drug delivery systems and our page on trimethyl chitosan for oral delivery for comparative insights.

3. Heavy Metal Chelation & Water Treatment

Among all chitosan derivatives, phosphorylated forms exhibit the highest selectivity for divalent and trivalent metal ions due to the strong complexing ability of phosphate groups. A magnetic phosphorylated chitosan composite (P-MCS) achieved a maximum Pb(II) adsorption capacity of 212.8 mg/g (PMC, 2022), and P-chitosan-coated Fe₃O₄@SiO₂ nanoparticles showed highly selective cobalt (Co²⁺) removal following Langmuir isotherm kinetics with pseudo-second-order adsorption (Springer, 2019).

Target pollutants include: Pb²⁺, Cd²⁺, Cu²⁺, Co²⁺, Hg²⁺, Cr(VI), rare earth elements (La³⁺, Ce³⁺), and radionuclides making P-chitosan highly relevant for industrial wastewater treatment, drinking water purification, and nuclear facility effluent management. Explore our dedicated [chitosan for water treatment](https://chitosanglobal.com/chitosan-for-water-treatment/) resource page.

4. Antioxidant & Antimicrobial Performance

The antioxidant capacity of P-chitosan increases proportionally with its degree of substitution. P-chitosan with DS ≈ 0.70 has been shown to exhibit free-radical scavenging activity comparable to ascorbic acid (vitamin C). Highly substituted species show pronounced in vivo antimicrobial performance against both gram-positive and gram-negative pathogens, with efficacy exceeding commercial antibiotics in controlled studies. These properties make P-chitosan a compelling candidate for active food packaging, wound dressings, and cosmetic preservative systems. Visit our quaternary chitosan for antimicrobial systems page for comparison.

5. Agriculture & Agrochemical Delivery

Phosphorylated chitosan’s water solubility across a broad pH range makes it directly applicable in foliar spray formulations without acidic solubilization steps required for standard chitosan. Its ability to form metal polymer complexes is exploited for controlled-release micronutrient delivery (zinc, iron, manganese chelates) in precision agriculture. P-chitosan film coatings improve seed germination rates and post-harvest shelf life. See our food industry applications page for food-sector use cases.

6. Cosmetics & Personal Care

The polyampholytic nature of P-chitosan possessing both cationic amino and anionic phosphate groups gives it exceptional film-forming properties on skin and hair at physiological pH. It functions as a moisturizing agent, conditioning polymer, and adhesion promoter in serums, creams, shampoos, and wound dressings without the acidic pH requirements that limit standard chitosan in cosmetic formulations. Explore our cosmetic formulations page for further context.

Phosphorylated Chitosan vs. Other Chitosan Derivatives

Property	Phosphorylated	Carboxymethyl	Quaternary (HTCC)	Trimethyl (TMC)	Sulfonated
Water Solubility	Neutral–alkaline pH	Full (pH-independent)	Full (cationic)	Full (cationic)	Full (anionic)
Charge Type	Polyampholytic (±)	Anionic (–)	Cationic (+)	Cationic (+)	Anionic (–)
Key Bioactivity	Bone mineral, metal chelation	Wound healing, moisturizing	Antimicrobial, gene delivery	Mucosal absorption	Anticoagulant, antiviral
Drug Delivery Route	Parenteral, nasal, oral	Topical, hydrogel	Nasal, oral, gene	Oral, mucosal	Parenteral, topical
Metal Chelation	Excellent (phosphate coordination)	Moderate	Low	Low	Moderate (sulfonate)
Bone Applications	Excellent (biomimetic)	Good (scaffold)	Moderate	Limited	Limited
Vegan (Mushroom)	✓ Available	✓ Available	✓ Available	✓ Available	✓ Available
Product	This page	[CM-Chitosan]	[Quaternary]	[TMC]	[Sulphonated]

All derivatives above are available in mushroom-derived form from Chitosan Global. See our complete chitosan derivatives supplier overview.

Manufacturing Process & Quality Control

From Mushroom Cell Wall to Pharmaceutical-Grade P-Chitosan

Our mushroom-derived phosphorylated chitosan is manufactured through a multi-stage controlled process:

• Stage 1 — Biomass Cultivation: Fungal mycelium is cultivated under GMP-aligned conditions, ensuring consistent chitin content (15–25% of dry cell wall mass)
• Stage 2 — Chitin Extraction: Alkali treatment (NaOH, elevated temperature) removes proteins; acid treatment (HCl) removes mineral ash, yielding purified fungal chitin with purity ≥ 95%
• Stage 3 — Deacetylation: Concentrated NaOH at controlled temperature converts N-acetyl groups to free amino groups, achieving DDA ≥ 75%; degree monitored by ¹H NMR
• Stage 4 — Phosphorylation Reaction: Chitosan reacted with selected phosphorylating agent (POCl₃ or H₃PO₄/P₂O₅ system) under inert atmosphere; DS controlled by reaction time and agent ratio
• Stage 5 — Purification & Neutralization: Sodium salt formation (ethanol washing + NaOH treatment) eliminates inter/intramolecular crosslinks, ensuring water-solubility independent of DS
• Stage 6 — Drying & Milling: Spray-drying or lyophilization to target moisture ≤ 10%; milled to specification particle size
• Stage 7 — QC Release Testing: Each batch undergoes DS verification (³¹P NMR), molecular weight (GPC), heavy metals (ICP-MS), moisture (KF), pH, viscosity, and microbial limits before release

A batch-specific Certificate of Analysis (COA) is available for every order. Download a sample COA to review our testing parameters.

Packaging, Ordering & Pricing

Order Quantity	Price (USD)	Packaging	Shipping
25g Sample	$65 (free shipping)	Sealed zip-lock foil pouch	Only For USA
1 kg	$180/kg	HDPE bottle or foil bag	FedEx — $60 + 15% tariff (USA)
100 kg – 500 kg	$160/kg	25 kg fiber drums or custom	Contact for freight quote
500 kg+ (Bulk)	Contact for quote	IBC or custom	Contact for dedicated logistics

• MOQ: 25g sample with free worldwide shipping — the lowest commitment entry in the market
• Bulk pricing starts at 100 kg; volume discounts available for 500 kg+ annually contracted orders
• Custom packaging, private-label, and white-label options available for OEM customers
• Confidential orders protected under our Mutual Non-Disclosure Agreement (MNDA)

Why Choose Chitosan Global for Phosphorylated Chitosan?

Differentiator	What It Means for You
Mushroom-Derived, 100% Vegan	Expand into vegan, halal, and allergy-sensitive markets without reformulation risk
Lowest-MOQ Free Sample	Test batch quality before committing capital no courier fees, no paperwork
Batch COA on Every Order	Reduce your supplier qualification time; all critical parameters documented and downloadable
Multi-Grade Availability	One supplier for R&D samples AND industrial scale-up simplify your vendor list
ESG-Aligned Supply Chain	Demonstrate sustainable sourcing to your own customers we provide full traceability documentation
Responsive Technical Support	Steve Nice (423-202-6145) provides direct access to a chitosan specialist, not a call center
Transparent Bulk Pricing	Published $160/kg rate for 100–500 kg removes procurement guesswork
Full Derivative Portfolio	Complementary [TMC], [CM], [QC] — all mushroom-derived

Frequently Asked Questions

What is the difference between phosphorylated chitosan and regular chitosan?

Regular chitosan is soluble only in dilute acidic solutions (pH < 6) due to protonation of its amino groups. Phosphorylated chitosan has phosphate groups grafted onto the backbone (at C6-OH and/or C2-NH₂ positions), which provide water solubility across neutral and alkaline pH (>6.5). This broadens its applicability in pharmaceutical formulation, biomedical scaffolding, and industrial water treatment where acidic conditions are impractical.

Is your phosphorylated chitosan suitable for pharmaceutical use?

Yes. Our pharmaceutical-grade P-chitosan is produced under GMP-aligned conditions and comes with a full batch COA documenting heavy metals, moisture, DS, molecular weight, and microbial limits. It has been successfully used by research institutions in drug delivery and bone regeneration studies. For GMP certification requirements specific to your regulatory jurisdiction, please contact our team.

What is the degree of substitution (DS) of your phosphorylated chitosan?

Our standard grade is supplied with DS between 0.5 and 1.2. The exact DS is documented on each batch COA. Custom DS values can be manufactured to order lower DS produces a partially water-soluble form capable of self-assembling into nanoparticles, while higher DS ensures full water solubility across a wide pH range.

Why is mushroom-derived phosphorylated chitosan preferred over shrimp-derived?

Mushroom-derived P-chitosan offers three critical advantages: (1) It is 100% vegan and allergen-free, removing barriers in food, cosmetic, and pharmaceutical markets regulated for shellfish allergens. (2) It is halal and kosher-compatible, opening markets in the Middle East, Southeast Asia, and Orthodox Jewish communities. (3) It has a more sustainable environmental footprint — fungal biomass can be cultivated year-round on agricultural waste substrates, unlike crustacean sources tied to seasonal fishery supply chains.

Can phosphorylated chitosan be used in bone cement formulations?

Yes, this is one of P-chitosan’s most well-validated biomedical applications. Water-soluble P-chitosan dissolves directly in calcium carbonate or calcium phosphate cement liquid phases, acting as a bioactive additive that promotes biomineralization and bone cell adhesion. Published in vivo data in rabbit bone defect models shows complete wound healing with no complications across a 22-week study period.

How does phosphorylated chitosan chelate heavy metals?

Phosphate groups on P-chitosan form strong coordination complexes with multivalent metal cations (Pb²⁺, Cd²⁺, Co²⁺, Cu²⁺, rare earths) through phosphate–metal coordination bonds. The mechanism follows Langmuir adsorption isotherms (monolayer surface complexation) with pseudo-second-order kinetics. A magnetic P-chitosan composite has demonstrated a maximum Pb(II) adsorption capacity of 212.8 mg/g among the highest reported for any biopolymer adsorbent.

What is the water solubility profile of phosphorylated chitosan?

Standard chitosan dissolves only below pH 6. Phosphorylated chitosan with moderate DS (≥ 0.5) dissolves readily in water at neutral pH (6–8). Highly substituted sodium-salt forms are soluble across the full pH range (4–12). This is because deprotonated phosphate groups (above their pKa of ~6.5) provide hydrophilic repulsion that disrupts inter- and intramolecular hydrogen bonding.

Is phosphorylated chitosan biocompatible and biodegradable?

Yes. Multiple in vivo studies confirm that P-chitosan and P-chitosan composites show no acute or subacute systemic toxicity, with H&E staining of major organs (heart, liver, spleen, lung, kidney) showing no histological abnormalities. P-chitosan degrades via lysozyme and chitosanase enzymes into non-toxic glucosamine phosphate fragments that are readily metabolized or excreted.

Can I request a custom molecular weight or DS?

Yes. Chitosan Global offers custom synthesis for bulk orders. Specify your target molecular weight range (50–500 kDa), desired DS, preferred solubility profile, and any regulatory grade requirements. Our technical team will provide a development timeline and quotation. Email steve@chitosanglobal.com with your specification sheet.

What packaging options are available for bulk orders?

Bulk P-chitosan is available in 25 kg fiber drums with polyethylene liner (standard), 10 kg HDPE bottles for pharmaceutical applications, custom foil bags for smaller research lots, and IBC containers for 500+ kg orders. Nitrogen-purged and desiccated packaging is available on request for moisture-sensitive applications.

Does phosphorylated chitosan have antioxidant properties?

Yes. The antioxidant capacity of P-chitosan increases with degree of substitution. P-chitosan at DS ≈ 0.70 demonstrates free-radical scavenging activity comparable to ascorbic acid. This property is exploited in active food packaging films, cosmetic antioxidant serums, and wound dressings where reducing oxidative stress accelerates tissue repair.

How does phosphorylated chitosan compare to carboxymethyl chitosan for drug delivery?

Both derivatives are fully water-soluble and biocompatible. Carboxymethyl chitosan (CMC) carries anionic carboxymethyl groups and is preferred for hydrogel formation, wound healing dressings, and topical drug delivery. Phosphorylated chitosan carries phosphate groups that mimic biological phospholipid and nucleotide structures, making it superior for mineralization-based applications (bone, dental), metal chelation, and gene delivery systems where phosphate DNA/RNA interactions are exploited. See our chitosan for hydrogels page for a full CMC application profile.

Can phosphorylated chitosan be used in agriculture?

Yes. P-chitosan’s water solubility at neutral pH makes it directly mixable into irrigation water or foliar sprays without pH adjustment. Its metal-chelating ability makes it an effective carrier for micronutrient delivery (zinc, iron, manganese). Field applications include seed priming (improved germination), elicitor sprays (enhanced plant defense responses), and fruit coating for post-harvest shelf life extension. Our [food industry applications page](https://chitosanglobal.com/chitosan-in-food-industry/) covers food-sector use cases in detail.

What is the shelf life and how should P-chitosan be stored?

Properly sealed phosphorylated chitosan powder has a shelf life of 24 months from manufacture date. Store in a cool (< 25°C), dry environment away from direct sunlight and humidity. Once opened, reseal the container with desiccant and use within 12 months. Avoid exposure to strong oxidizing agents or prolonged moisture, which may reduce DS over time.

Is a Certificate of Analysis (COA) available before purchase?

Yes. A sample COA is available for download directly from this page. Batch-specific COAs are provided with every order. The COA documents: appearance, DS by ³¹P NMR, molecular weight by GPC, DDA by ¹H NMR, phosphorus content by ICP-OES, moisture (KF), ash content, heavy metals (ICP-MS), pH, viscosity, and microbial limits.

Can phosphorylated chitosan be used to prepare nanoparticles?

Yes. Low DS P-chitosan (DS < 0.5) self-assembles into nanoparticles in aqueous media via hydrophobic aggregation, with particle size tunable by DS and ionic strength. Higher DS forms remain soluble and are combined with anionic polymers (alginate, heparin) or crosslinkers (TPP tripolyphosphate) to form nanospheres and nanocapsules. See our [chitosan hydrochloride for nanoparticles](https://chitosanglobal.com/chitosan-hydrochloride-for-nanoparticles/) page for comparative nanoparticle preparation approaches.

Is phosphorylated chitosan used in cosmetics?

Yes. Its polyampholytic character (positive amino groups + negative phosphate groups) gives P-chitosan outstanding film-forming properties at skin-compatible pH values. It is used in moisturizing serums, conditioning hair treatments, and multifunctional active packaging. Standard chitosan requires acidic pH to dissolve, which limits cosmetic use — phosphorylation removes this constraint. See our [cosmetics applications](https://chitosanglobal.com/chitosan-in-cosmetics/) page for formulation guidance.

How do I place an order or request a quote for bulk supply?

Orders can be placed directly from this page. For bulk quantities (> 100 kg), custom grades, or industrial supply agreements, contact Steve Nice at steve@chitosanglobal.com or call +1 423-202-6145. We respond within 1 business day. For confidential projects, our MNDA (Mutual Non-Disclosure Agreement) can be executed prior to technical discussions.

What industries use phosphorylated chitosan?

Phosphorylated chitosan serves pharmaceutical and biomedical R&D (bone cements, drug delivery, tissue engineering), environmental engineering (heavy metal remediation, wastewater treatment), precision agriculture (micronutrient delivery, plant elicitors), food science (active packaging, preservation coatings, antioxidant films), cosmetics and personal care (moisturizers, conditioners, film formers), and industrial chemistry (flame retardants, ionic conductors, sequestrants). As a [industrial chitosan manufacturer](https://chitosanglobal.com/industrial-chitosan-manufacturer/), Chitosan Global serves all these verticals from a single supply source.

Does phosphorylated chitosan have flame-retardant properties?

Yes, phosphorus-containing polymers are well-established flame retardants, and phosphorylated chitosan is no exception. The phosphate groups promote char formation during combustion, reducing flammable volatile release. This makes P-chitosan a bio-based, non-halogenated flame retardant additive for bioplastics, natural fiber composites, and textile treatments a growing application area aligned with global restrictions on halogenated flame retardants.

Request Your Sample or Bulk Quote Today

Ready to evaluate Mushroom-Derived Phosphorylated Chitosan for your application? Start with our free 25g sample, no risk, no minimum commitment. Our pharmaceutical and industrial grades come with full batch COAs and direct technical support from our chitosan specialists.

• Order a 25g sample: Add to cart above — free shipping
• Bulk pricing inquiry: Email steve@chitosanglobal.com with quantity, grade, and application requirements
• Technical consultation: Call Steve Nice at +1 423-202-6145 (Mon–Fri, Eastern Time)
• Confidential projects: Execute our MNDA before technical discussion
• COA download: Available above verify our quality parameters before ordering

Chitosan Global is your dedicated source for the complete family of mushroom-derived chitosan derivatives. From sulfonated and trimethyl to carboxymethyl and quaternary chitosan all vegan, all traceable, all backed by published COAs. As a committed food-grade chitosan supplier and industrial chitosan manufacturer, we scale with your business from lab to commercial production.